const std = @import("std");
const pardes = @import("pardes");
const panes = pardes.panes;
const config = pardes.config;
const builtins = pardes.builtins;
const modal = pardes.modal;

const Pardes = pardes.Pardes;
const Key = pardes.Key;
const platform = pardes.platform;
const font_picker = pardes.font_picker;
const fonts = if (font_picker) pardes.fonts else struct {};

// Sorting tests compare original locations and source bytes independently of
// alignment. Dedicated Locations tests verify the rendered column widths.
fn expectResultRows(expected: []const u8, file: *const panes.File.State) !void {
    if (file.location_rows.len == 0) return std.testing.expectEqualStrings(expected, file.content);
    try std.testing.expectEqual(std.mem.endsWith(u8, expected, "\n"), std.mem.endsWith(u8, file.content, "\n"));
    var source = std.mem.splitScalar(u8, expected, '\n');
    var shown = std.mem.splitScalar(u8, file.content, '\n');
    for (file.location_rows) |row| {
        const want = source.next() orelse return error.MissingExpectedResult;
        const actual = shown.next() orelse return error.MissingRenderedResult;
        const target = panes.Output.location(want);
        try std.testing.expectEqualStrings(want[0..target.end], actual[0..row.location_end]);
        try std.testing.expectEqualStrings(want[@min(want.len, target.end + 1)..], actual[row.code_start..]);
    }
    try std.testing.expectEqualStrings("", source.next() orelse "");
    try std.testing.expect(source.next() == null);
}

test "search tint survives wrapping and theme changes while selections remain authoritative" {
    const text = "nested/path/a.txt:1:5-7 let abc = 1;\n";
    for ([_]u16{ 30, 80 }) |width| {
        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = width, .rows = 12 });
        defer p.deinit();
        const pane = try p.setTestFile(text);
        pane.file.?.output = .{ .from = .search };
        var frame = std.heap.ArenaAllocator.init(std.testing.allocator);
        defer frame.deinit();
        for ([_]bool{ false, true }) |bottom| {
            p.settings.tag_bottom = bottom;
            for ([_]bool{ true, false, true }) |colors| {
                p.settings.colors = colors;
                const surface = try p.render(frame.allocator());
                var marked: usize = 0;
                for (surface.cells) |cell| {
                    if (std.meta.eql(cell.style.bg, pardes.Color{ .rgb = p.theme().search_bg.? })) marked += 1;
                }
                try std.testing.expectEqual(@as(usize, if (colors) 3 else 0), marked);
                _ = frame.reset(.retain_capacity);
            }
        }
        // The body changes immediately even when dark chrome is still fading.
        try std.testing.expect(p.executeBuiltinLine(0, "Theme daybreak"));
        const light = try p.render(frame.allocator());
        var light_matches: usize = 0;
        for (light.cells) |cell| {
            if (!std.meta.eql(cell.style.bg, pardes.Color{ .rgb = p.theme().search_bg.? })) continue;
            try std.testing.expectEqualDeep(pardes.Color{ .rgb = p.theme().search_fg.? }, cell.style.fg);
            light_matches += 1;
        }
        try std.testing.expectEqual(@as(usize, 3), light_matches);
        pane.body.mode = .normal;
        pane.body.cur_row = 0;
        pane.body.cur_col = @intCast(std.mem.indexOf(u8, text, "abc").? + 2);
        pane.body.vsel = .{ .active = true, .row = 0, .col = pane.body.cur_col - 2, .explicit = true };
        const selected = try p.render(frame.allocator());
        for (selected.cells) |cell|
            try std.testing.expect(!std.meta.eql(cell.style.bg, pardes.Color{ .rgb = p.theme().search_bg.? }));
        try std.testing.expectEqualStrings(text, pane.file.?.content);
    }
}

fn outputCell(p: *Pardes, surface: *pardes.Surface, id: usize, byte: usize) *pardes.Cell {
    const pane = p.panes[id].?;
    const line = modal.lineSlice(pane.file.?.content, 0);
    const rect = p.rects[id];
    const x = rect.x + config.GUTTER + panes.File.gutterWidth(pane) + @as(u16, @intCast(panes.File.displayWidth(line[0..byte])));
    const y = p.bodyTop(pane, rect);
    return surface.at(x, y);
}

fn resultId(p: *Pardes) !usize {
    for (p.panes, 0..) |slot, id| if (slot) |pane| {
        if (pane.file) |file| if (file.output != null) return id;
    };
    return error.MissingOutput;
}

test "output callers opt into location highlighting instead of matching prose colons" {
    for ([_]panes.Output.Origin{ .{ .cmd = .LocationsConfig }, .{ .cmd = .Config }, .{ .query = .hover } }) |origin| {
        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 140, .rows = 30 });
        defer p.deinit();
        p.locations_config.layout = .@"inline";
        _ = try p.setTestFile("ordinary\n");
        p.presentation.enabled = false;
        if (origin == .cmd and origin.cmd == .LocationsConfig) {
            p.locations_config.context = 5;
            try std.testing.expect(p.executeBuiltinLine(0, "LocationsConfig"));
        } else {
            try panes.Output.fillResults(p, 0, "/", origin, "plain report", try p.gpa.dupe(u8, "source.zig:3:5-7 warning: context:5\n"), null);
        }
        const id = try resultId(p);
        const file = &p.panes[id].?.file.?;
        try std.testing.expectEqual(@as(usize, 0), file.location_rows.len);
        pardes.layout.compute(p);
        var frame = std.heap.ArenaAllocator.init(p.gpa);
        defer frame.deinit();
        const surface = try p.render(frame.allocator());
        const line = modal.lineSlice(file.content, 0);
        const before_colon = std.mem.indexOfScalar(u8, line, ':').?;
        const normal: pardes.Color = if (p.theme().fg) |fg| .{ .rgb = fg } else .default;
        for (0..before_colon + 2) |byte| {
            const cell = outputCell(p, surface, id, byte);
            try std.testing.expectEqual(normal, cell.style.fg);
            try std.testing.expect(!cell.style.bold);
        }
    }
}

test "location producers retain rendered location match and diagnostic styles" {
    for ([_]panes.Output.Origin{ .search, .{ .cmd = .Grep }, .{ .query = .references }, .{ .query = .diagnostics } }) |origin| {
        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 140, .rows = 30 });
        defer p.deinit();
        p.locations_config.layout = .@"inline";
        _ = try p.setTestFile("ordinary\n");
        p.presentation.enabled = false;
        const diagnostic = origin == .query and origin.query == .diagnostics;
        const code = if (diagnostic) "warning: unused value" else "const value = 42;";
        try panes.Output.fillResults(p, 0, "/", origin, "styles", try std.fmt.allocPrint(p.gpa, "source.zig:3:1-3 {s}\n", .{code}), null);
        const id = try resultId(p);
        const file = &p.panes[id].?.file.?;
        try std.testing.expectEqual(@as(usize, 1), file.location_rows.len);
        pardes.layout.compute(p);
        var frame = std.heap.ArenaAllocator.init(p.gpa);
        defer frame.deinit();
        const surface = try p.render(frame.allocator());
        const chrome = pardes.ChromeTheme.fromTheme(p.theme());
        try std.testing.expectEqual(pardes.Color{ .rgb = chrome.lineno }, outputCell(p, surface, id, 0).style.fg);
        const start = file.location_rows[0].code_start;
        const first = outputCell(p, surface, id, start);
        if (diagnostic) {
            try std.testing.expectEqual(pardes.Color{ .rgb = chrome.diagnostic_warning }, first.style.fg);
            try std.testing.expect(first.style.bold);
        } else if (origin == .search or origin == .cmd) {
            try std.testing.expectEqual(pardes.Color{ .rgb = chrome.search_bg }, first.style.bg);
        }
        if (!diagnostic and pardes.syntax.enabled) {
            const number = start + std.mem.indexOf(u8, code, "42").?;
            try std.testing.expectEqual(pardes.Color{ .rgb = p.theme().num }, outputCell(p, surface, id, number).style.fg);
        }
    }
}

test "location results sort filenames and numeric positions while remapping their anchor" {
    const before = "z.zig:1:1 z\nb.zig:10:2-3 ten\nb.zig:2:10-12 two-b\nb.zig:2:2-3 two-a\na.zig:99:1 a\nb.zig:2:2-3 duplicate\n";
    const after = "a.zig:99:1 a\nb.zig:2:2-3 two-a\nb.zig:2:2-3 duplicate\nb.zig:2:10-12 two-b\nb.zig:10:2-3 ten\nz.zig:1:1 z\n";
    for ([_]panes.Output.Origin{ .search, .{ .cmd = .Grep }, .{ .query = .references }, .{ .query = .diagnostics } }) |origin| {
        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
        defer p.deinit();
        p.locations_config.layout = .@"inline";
        const source = try p.setTestFile("notes\n");
        try panes.Output.fillResults(p, 0, "/tmp", origin, "", try p.gpa.dupe(u8, before), 2);
        const results = p.panes[source.search_pane.?].?;
        try expectResultRows(after, &results.file.?);
        try std.testing.expectEqual(@as(usize, 3), source.search_row.?);
    }
}

test "ranked choices and prose retain their supplied order" {
    const text = "z.zig:10:1 first\na.zig:2:1 second\n";
    for ([_]pardes.lsp.Kind{ .completion, .hover, .code_action }) |kind| {
        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
        defer p.deinit();
        p.locations_config.layout = .@"inline";
        _ = try p.setTestFile("notes\n");
        try panes.Output.fillResults(p, 0, "/tmp", .{ .query = kind }, "", try p.gpa.dupe(u8, text), null);
        const result = for (p.panes) |slot| {
            const pane = slot orelse continue;
            const file = pane.file orelse continue;
            if (file.output != null) break file;
        } else return error.MissingResults;
        try std.testing.expectEqualStrings(text, result.content);
    }
}

test "reference Look selects the next sorted row from the captured request and keeps navigation there" {
    if (!pardes.lsp.supports.contains(.references)) return error.SkipZigTest;
    var tmp = std.testing.tmpDir(.{});
    defer tmp.cleanup();
    try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "m.zig", .data = "const item = 0;\n_ = item;\n_ = item;\n_ = item;\n_ = item;\n" });
    try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "a.zig", .data = "a\n" });
    try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "z.zig", .data = "z\n" });
    var path_buf: [256]u8 = undefined;
    const path = try std.fmt.bufPrint(&path_buf, ".zig-cache/tmp/{s}/m.zig", .{tmp.sub_path});
    const p = try Pardes.init(std.testing.allocator, .{ .file = path, .cols = 80, .rows = 24 });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    const source = p.panes[0].?;
    const response = "m.zig:5:5-8 later\nz.zig:1:1 last-file\nm.zig:1:7-10 earlier\nm.zig:3:5-8 current\na.zig:1:1 first-file\nm.zig:4:5-8 next\n";
    const sorted = "a.zig:1:1 first-file\nm.zig:1:7-10 earlier\nm.zig:3:5-8 current\nm.zig:4:5-8 next\nm.zig:5:5-8 later\nz.zig:1:1 last-file\n";
    source.body.cur_row = 2;
    source.body.cur_col = 4;
    p.lspRequest(0, .references, "");
    const request = p.lsp_wait.?.id;
    source.body.cur_row = 4;
    p.lspResponse(request, response);
    const rid = source.search_pane orelse return error.MissingResults;
    const results = p.panes[rid].?;
    try expectResultRows(sorted, &results.file.?);
    try std.testing.expectEqual(@as(usize, 0), p.active);
    try std.testing.expectEqual(@as(i32, 3), source.body.cur_row);
    try std.testing.expect(source.body.vsel.active);
    try std.testing.expectEqual(@as(i32, 4), @min(source.body.cur_col, source.body.vsel.col));
    try std.testing.expectEqual(@as(i32, 7), @max(source.body.cur_col, source.body.vsel.col));
    try std.testing.expectEqual(@as(i32, 3), results.body.cur_row);
    try std.testing.expectEqual(@as(usize, 3), source.search_row.?);
    try std.testing.expectEqual(results.serial, p.look_walk_owner.?);
    try std.testing.expectEqual(@as(i32, 3), results.look_at.?.row);
    const available = p.freeSlot();
    p.update(.{ .key = .{ .cp = 'n' } });
    try std.testing.expectEqual(rid, p.active);
    try std.testing.expectEqual(@as(i32, 4), results.body.cur_row);
    try std.testing.expectEqual(available, p.freeSlot());
    p.update(.{ .key = .{ .cp = 'N' } });
    try std.testing.expectEqual(@as(i32, 3), results.body.cur_row);

    p.active = 0;
    source.body.cur_row = 4;
    source.body.cur_col = 4;
    p.lspRequest(0, .references, "");
    p.lspResponse(p.lsp_wait.?.id, response);
    try std.testing.expect(std.mem.endsWith(u8, p.panes[p.active].?.file.?.path, "/z.zig"));
    try std.testing.expectEqual(@as(i32, 5), results.body.cur_row);
    try std.testing.expectEqual(@as(usize, 5), source.search_row.?);
    const last = p.active;
    p.lspRequest(last, .references, "");
    p.lspResponse(p.lsp_wait.?.id, response);
    try std.testing.expect(std.mem.endsWith(u8, p.panes[p.active].?.file.?.path, "/a.zig"));
    const wrapped = p.panes[p.panes[last].?.search_pane.?].?;
    try std.testing.expectEqual(@as(i32, 0), wrapped.body.cur_row);
    try std.testing.expectEqual(wrapped.serial, p.look_walk_owner.?);
}

test "location sorting leaves mixed prose alone and preserves newline shape" {
    const cases = [_]struct { before: []const u8, after: []const u8, anchor: usize }{
        .{
            .before = "heading\nz.zig:10:1 z\nnot a location\nx file.zig:2:10 x\nx file.zig:2:2 y\n\n",
            .after = "heading\nz.zig:10:1 z\nnot a location\nx file.zig:2:10 x\nx file.zig:2:2 y\n\n",
            .anchor = 1,
        },
        .{
            .before = "z.zig:10:1 z\nx file.zig:2:10 x\nx file.zig:2:2 y",
            .after = "x file.zig:2:2 y\nx file.zig:2:10 x\nz.zig:10:1 z",
            .anchor = 1,
        },
    };
    for (cases) |case| {
        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
        defer p.deinit();
        p.locations_config.layout = .@"inline";
        const source = try p.setTestFile("notes\n");
        try panes.Output.fillResults(p, 0, "/tmp", .search, "", try p.gpa.dupe(u8, case.before), 1);
        try expectResultRows(case.after, &p.panes[source.search_pane.?].?.file.?);
        try std.testing.expectEqual(case.anchor, source.search_row.?);
    }
}

test "a single language location opens the full spaced filename" {
    if (!pardes.lsp.supports.contains(.references)) return error.SkipZigTest;
    var tmp = std.testing.tmpDir(.{});
    defer tmp.cleanup();
    try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "from.zig", .data = "const item = 0;\n" });
    try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "with space.zig", .data = "first\nsecond\n" });
    var path_buf: [256]u8 = undefined;
    const path = try std.fmt.bufPrint(&path_buf, ".zig-cache/tmp/{s}/from.zig", .{tmp.sub_path});
    const p = try Pardes.init(std.testing.allocator, .{ .file = path });
    defer p.deinit();
    p.lspRequest(0, .references, "");
    p.lspResponse(p.lsp_wait.?.id, "with space.zig:2:1 second\n");
    try std.testing.expect(std.mem.endsWith(u8, p.panes[p.active].?.file.?.path, "/with space.zig"));
    try std.testing.expectEqual(@as(i32, 1), p.panes[p.active].?.body.cur_row);
    for (p.panes) |slot| {
        const pane = slot orelse continue;
        if (pane.file) |file| try std.testing.expect(file.output == null);
    }
}

test "result locations stop before preview text and retain full addresses" {
    const cases = [_]struct { row: []const u8, path: []const u8, line: usize, col: usize, address: []const u8 }{
        .{ .row = "a.zig:2 see other.zig:10:1", .path = "a.zig", .line = 2, .col = 0, .address = "a.zig:2" },
        .{ .row = "a.zig:2:10-12 see other.zig:1:1", .path = "a.zig", .line = 2, .col = 10, .address = "a.zig:2:10-12" },
        .{ .row = "with space.zig:100:2 café", .path = "with space.zig", .line = 100, .col = 2, .address = "with space.zig:100:2" },
        .{ .row = "@p3:20:1 pane", .path = "@p3", .line = 20, .col = 1, .address = "@p3:20:1" },
        .{ .row = "/n/peer/file.zig:5-8 span", .path = "/n/peer/file.zig", .line = 5, .col = 0, .address = "/n/peer/file.zig:5-8" },
    };
    for (cases) |case| {
        const got = panes.Output.location(case.row);
        try std.testing.expectEqualStrings(case.path, got.path);
        try std.testing.expectEqual(case.line, got.at.line);
        try std.testing.expectEqual(case.col, got.at.col);
        try std.testing.expectEqualStrings(case.address, case.row[0..got.end]);
    }
}

test "reordered identical results preserve the selected row and warm line index" {
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    const source = try p.setTestFile("notes\n");
    const sorted = "a.zig:2:1 first\na.zig:10:1 second\n";
    try panes.Output.fillResults(p, 0, "/tmp", .{ .query = .references }, "", try p.gpa.dupe(u8, sorted), null);
    const result = p.panes[source.search_pane.?].?;
    const file = &result.file.?;
    const index = try panes.File.lineIndex(p.gpa, file);
    const content = file.content.ptr;
    const revision = file.revision;
    result.body.cur_row = 1;
    result.body.cur_col = 0;
    result.body.vsel = .{ .active = true, .explicit = true, .row = 1, .col = 9 };
    result.body.select = true;
    const selected = result.body.vsel;
    try panes.Output.fillResults(p, 0, "/tmp", .{ .query = .references }, "new request", try p.gpa.dupe(u8, "a.zig:10:1 second\na.zig:2:1 first\n"), 0);
    try expectResultRows(sorted, file);
    try std.testing.expectEqual(content, file.content.ptr);
    try std.testing.expectEqual(index.ptr, file.line_starts.ptr);
    try std.testing.expectEqual(revision, file.revision);
    try std.testing.expectEqual(selected, result.body.vsel);
    try std.testing.expect(result.body.select);
    try std.testing.expectEqual(@as(i32, 1), result.body.cur_row);
    try std.testing.expectEqual(@as(usize, 1), source.search_row.?);
}

test "result sorting allocation failures preserve the previous answer and navigation" {
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    const source = try p.setTestFile("notes\n");
    try panes.Output.fillResults(p, 0, "/tmp", .{ .query = .references }, "before", try p.gpa.dupe(u8, "a.zig:1:1 keep\n"), 0);
    const id = source.search_pane.?;
    const result = p.panes[id].?;
    const content = result.file.?.content.ptr;
    const revision = result.file.?.revision;
    const owner = p.look_walk_owner;
    var preview: [4096]u8 = @splat('x');
    for (0..2) |failure| {
        var failing = std.testing.FailingAllocator.init(p.gpa, .{ .fail_index = failure });
        const original_scratch = p.scratch;
        p.scratch = .init(failing.allocator());
        defer {
            p.scratch.deinit();
            p.scratch = original_scratch;
        }
        const incoming = try std.fmt.allocPrint(p.gpa, "z.zig:2:1 {s}\na.zig:1:1 {s}\n", .{ &preview, &preview });
        try std.testing.expectError(error.OutOfMemory, panes.Output.fillResults(p, 0, "/tmp", .{ .query = .references }, "after", incoming, 1));
        try std.testing.expect(failing.has_induced_failure);
        try std.testing.expectEqual(content, result.file.?.content.ptr);
        try std.testing.expectEqual(revision, result.file.?.revision);
        try std.testing.expectEqualStrings("before", result.file.?.output.?.arg());
        try std.testing.expectEqual(id, source.search_pane.?);
        try std.testing.expectEqual(@as(usize, 0), source.search_row.?);
        try std.testing.expectEqual(@as(usize, 0), p.active);
        try std.testing.expectEqual(owner, p.look_walk_owner);
    }
}

test "Find sorts whole filenames and next location uses numeric columns" {
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    const source = try p.setTestFile("");
    try panes.Output.fillResults(p, 0, "/tmp", .{ .cmd = .Find }, "", try p.gpa.dupe(u8, "x:2\nx:10\n"), 0);
    const result = p.panes[source.search_pane.?].?;
    try std.testing.expectEqualStrings("x:10\nx:2\n", result.file.?.content);
    try std.testing.expectEqual(@as(usize, 1), source.search_row.?);
    const rows = "with space.zig:2:2-3 first\nwith space.zig:2:10-12 next\nwith space.zig:10:1 later";
    try std.testing.expectEqual(@as(usize, 1), panes.Output.nextResult(rows, &.{}, "with space.zig", .{ .line = 2, .col = 3 }));
    try std.testing.expectEqual(@as(usize, 2), panes.Output.nextResult(rows, &.{}, "with space.zig", .{ .line = 2, .col = 10 }));
    try std.testing.expectEqual(@as(usize, 0), panes.Output.nextResult(rows, &.{}, "with space.zig", .{ .line = 10, .col = 1 }));
}

test "result stepping reaches an unterminated last row" {
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    const source = try p.setTestFile("one\ntwo\n");
    const rows = try std.fmt.allocPrint(p.gpa, "{s}:1:1 first\n{s}:2:1 last", .{ source.file.?.path, source.file.?.path });
    try panes.Output.fillResults(p, 0, "/tmp", .search, "", rows, 0);
    try std.testing.expect(pardes.test_api.searchStep(p, 0, 1));
    try std.testing.expectEqual(@as(usize, 1), source.search_row.?);
    const result = p.panes[source.search_pane.?].?;
    try std.testing.expectEqual(@as(i32, 1), result.body.cur_row);
}

test "Mini uses OS source precedence and refreshes one independent snapshot" {
    var tmp = std.testing.tmpDir(.{});
    defer tmp.cleanup();
    try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "build.zig", .data = "x\n" });
    var dir_buf: [4096]u8 = undefined;
    const dir = dir_buf[0..try tmp.dir.realPath(std.testing.io, &dir_buf)];
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    try p.panes[0].?.setOwnedCwd(dir);
    try std.testing.expect(p.executeBuiltinLine(0, "Mini build.zig"));
    const id = p.active;
    try std.testing.expect(id != 0);
    const mini = p.panes[id].?;
    try std.testing.expect(mini.terminal == null);
    try std.testing.expectEqualStrings("⠁\n", mini.file.?.content);
    try std.testing.expect(std.mem.startsWith(u8, mini.file.?.mini.?.source, dir));
    const next = p.freeSlot();
    const body = mini.file.?.content.ptr;
    try std.testing.expect(p.executeBuiltinLine(id, "Mini build.zig"));
    try std.testing.expectEqual(id, p.active);
    try std.testing.expectEqual(body, mini.file.?.content.ptr);
    try std.testing.expectEqual(next, p.freeSlot());
    try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "build.zig", .data = "xx\n" });
    try std.testing.expectEqualStrings("⠁\n", mini.file.?.content);
    try std.testing.expect(p.executeBuiltinLine(id, "Mini build.zig"));
    try std.testing.expectEqual(id, p.active);
    try std.testing.expectEqualStrings("⠉\n", mini.file.?.content);
    while (p.nextEffect()) |effect| switch (effect) {
        .watch => |watch| try std.testing.expect(watch.pane != id),
        else => {},
    };
    try std.testing.expect(p.executeBuiltinLine(id, "Save"));
    try std.testing.expect(mini.prompt == .save);
}

test "Mini dump preserves its exact virtual snapshot and body writes detach colors" {
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    const source = try p.setTestFile("pub fn start() void {}\n");
    var command_buf: [128]u8 = undefined;
    const command = try std.fmt.bufPrint(&command_buf, "Mini /virtual/pane/{d}/body", .{source.serial});
    try std.testing.expect(p.executeBuiltinLine(0, command));
    const id = p.active;
    const before = p.panes[id].?.file.?;
    try std.testing.expect(before.mini != null);
    try pardes.dump.dumpState(p);
    panes.File.setContent(p, &source.file.?, try p.gpa.dupe(u8, "changed\n"));
    const restored = try pardes.dump.initFromDump(std.testing.allocator, .{ .tty_only = true }, p.dump_out.?);
    defer restored.deinit();
    const mini = restored.panes[restored.active].?;
    try std.testing.expectEqualStrings(before.content, mini.file.?.content);
    try std.testing.expectEqualStrings(before.mini.?.source, mini.file.?.mini.?.source);
    try std.testing.expectEqualSlices(u8, before.mini.?.colors, mini.file.?.mini.?.colors);
    try std.testing.expect(before.content.ptr != mini.file.?.content.ptr);
    while (restored.nextEffect()) |effect| switch (effect) {
        .watch => |watch| try std.testing.expect(watch.pane != restored.active),
        else => {},
    };
    var body_buf: [128]u8 = undefined;
    const body_path = try std.fmt.bufPrint(&body_buf, "/n/self/pane/{d}/body", .{mini.serial});
    const body = try pardes.filesystem.read(restored, body_path);
    defer restored.gpa.free(body);
    try std.testing.expectEqualStrings(before.content, body);
    try pardes.filesystem.write(restored, body_path, "replacement\n");
    try std.testing.expectEqualStrings("replacement\n", mini.file.?.content);
    try std.testing.expect(mini.file.?.mini == null);
}

test "Mini syntax colors survive toggles themes and rendering without source access" {
    if (!pardes.syntax.enabled) return error.SkipZigTest;
    var tmp = std.testing.tmpDir(.{});
    defer tmp.cleanup();
    try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "demo.zig", .data = "pub fn main() void {\n    if (true) return;\n}\n" });
    var dir_buf: [4096]u8 = undefined;
    const dir = dir_buf[0..try tmp.dir.realPath(std.testing.io, &dir_buf)];
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 80, .rows = 24 });
    defer p.deinit();
    try p.panes[0].?.setOwnedCwd(dir);
    p.settings.colors = false;
    try panes.Mini.open(p, 0, "demo.zig");
    const id = p.active;
    const mini = p.panes[id].?;
    const keyword = std.mem.indexOfScalar(u8, mini.file.?.mini.?.colors, @intFromEnum(pardes.syntax.Syn.keyword)) orelse return error.MissingKeywordColor;
    // Direct pane construction bypasses the host update's layout sync.
    p.update(.{ .resize = .{ .cols = 80, .rows = 24 } });
    const position = modal.positionAt(mini.file.?.content, keyword);
    const column = panes.File.displayWidth(modal.lineSlice(mini.file.?.content, position.row)[0..position.col]);
    try tmp.dir.deleteFile(std.testing.io, "demo.zig");
    const colors = mini.file.?.mini.?.colors.ptr;
    var frame = std.heap.ArenaAllocator.init(std.testing.allocator);
    defer frame.deinit();
    for ([_]bool{ false, true, false, true }) |enabled| {
        p.settings.colors = enabled;
        mini.file.?.syntax_dirty = true;
        const surface = try p.render(frame.allocator());
        const rect = p.rects[id];
        const x = rect.x + config.GUTTER + panes.File.gutterWidth(mini) + @as(u16, @intCast(column));
        const y = p.bodyTop(mini, rect) + @as(u16, @intCast(position.row));
        if (enabled) try std.testing.expectEqualDeep(pardes.Color{ .rgb = p.theme().kw }, surface.at(x, y).style.fg);
        try std.testing.expectEqual(colors, mini.file.?.mini.?.colors.ptr);
        try std.testing.expectEqual(@as(usize, 0), mini.file.?.highlights.len);
        _ = frame.reset(.retain_capacity);
        try std.testing.expect(p.executeBuiltinLine(id, "NextColor"));
    }
}

test "Mini restore rejects inconsistent metadata before publishing a pane" {
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    const id = p.freeSlot().?;
    const serial = p.next_serial;
    for ([_]pardes.dump.File{
        .{ .content = "x", .mini_source = "/source.zig", .mini_colors_b64 = "AA==" },
        .{ .content = "x", .origin = "Mini", .mini_source = "/source.zig", .mini_colors_b64 = "" },
        .{ .content = "x", .origin = "Mini", .mini_source = "/source.zig", .mini_colors_b64 = "BQ==" },
        .{ .content = "x", .origin = "Mini", .mini_colors_b64 = "AA==" },
    }) |saved| {
        try std.testing.expectError(error.InvalidMini, panes.File.restore(p, id, .{ .kind = .file, .tag = "", .body = "", .file = saved }));
        try std.testing.expect(p.panes[id] == null);
        try std.testing.expectEqual(serial, p.next_serial);
    }
}

test "Mini failures leave its existing snapshot and focus unchanged" {
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    const source = try p.setTestFile("abc\n");
    var path_buf: [128]u8 = undefined;
    const path = try std.fmt.bufPrint(&path_buf, "/virtual/pane/{d}/body", .{source.serial});
    try panes.Mini.open(p, 0, path);
    const id = p.active;
    const mini = p.panes[id].?;
    const body = mini.file.?.content.ptr;
    const next = p.freeSlot();
    try std.testing.expectError(error.FileNotFound, panes.Mini.open(p, 0, "/virtual/does-not-exist"));
    try std.testing.expectEqual(id, p.active);
    try std.testing.expectEqual(body, mini.file.?.content.ptr);
    try std.testing.expectEqual(next, p.freeSlot());
}

test "Config prints the startup path and refreshes its one output" {
    const path = "/home/pardes-test/.config/pardes/init";
    const p = try Pardes.init(std.testing.allocator, .{ .startup_config_path = path });
    defer p.deinit();

    try std.testing.expect(p.executeBuiltinLine(0, "Config"));
    const opened = p.active;
    const out = p.panes[opened].?.file.?;
    for ([_][]const u8{
        "Startup config: " ++ path ++ "\n",
        "Theme orchard\n",
        "Shell effective (last spawn) (none)\n",
        "Shell pending on\n",
    }) |line| try std.testing.expect(std.mem.indexOf(u8, out.content, line) != null);
    var default_line: [256]u8 = undefined;
    try std.testing.expect(std.mem.indexOf(u8, out.content, try std.fmt.bufPrint(&default_line, "Shell requested (new panes) {s} (default)\n", .{config.defaultShell()})) != null);
    try std.testing.expectEqualStrings(config.config_buffer, std.fs.path.basename(out.path));
    try std.testing.expectEqual(panes.Output.Origin{ .cmd = .Config }, out.output.?.from);

    try std.testing.expect(p.executeBuiltinLine(0, "Config"));
    try std.testing.expectEqual(opened, p.active);
    var buffers: usize = 0;
    for (p.panes) |slot| {
        const f = (slot orelse continue).file orelse continue;
        const origin = (f.output orelse continue).from;
        buffers += @intFromBool(std.meta.eql(origin, panes.Output.Origin{ .cmd = .Config }));
    }
    try std.testing.expectEqual(@as(usize, 1), buffers);
}

test "Config reports the absence of a per-user config path" {
    const p = try Pardes.init(std.testing.allocator, .{});
    defer p.deinit();
    try std.testing.expect(p.executeBuiltinLine(0, "Config"));
    const report = p.panes[p.active].?.file.?.content;
    try std.testing.expect(std.mem.indexOf(u8, report, "no per-user config path") != null);
}

test "EffectCode lists readable virtual sources used by this backend" {
    if (comptime !builtins.EffectCode.enabled) return;
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();

    if (!pardes.memory.limits.embedded_sources) {
        const before = p.active;
        try std.testing.expect(p.executeBuiltinLine(0, "EffectCode PanelSlide"));
        try std.testing.expectEqual(before, p.active);
        return error.SkipZigTest;
    }
    try std.testing.expect(p.executeBuiltinLine(0, "EffectCode PanelSlide"));
    const out = p.panes[p.active].?.file.?;
    try std.testing.expectEqualStrings(config.effect_code_buffer, std.fs.path.basename(out.path));
    try std.testing.expectEqual(panes.Output.Origin{ .cmd = .EffectCode }, out.output.?.from);
    try std.testing.expectEqualStrings("PanelSlide", out.output.?.arg());
    try std.testing.expect(out.content.len < 1024);
    try std.testing.expect(std.mem.indexOf(u8, out.content, "/virtual/src/layout.zig\n") != null);
    const backend_source = switch (platform) {
        .tty => "/virtual/src/tty/panel_compositor.zig",
        .gui => if (@import("pardes_config").gui_shader_sources_prebuilt)
            "/virtual/shaders/prebuilt/ui.vert.glsl"
        else
            "/virtual/shaders/ui.vert.glsl",
        .macos => "/virtual/src/macos/Sources/ScenePostprocessor.swift",
        .web, .esp32p4 => unreachable,
    };
    try std.testing.expect(std.mem.indexOf(u8, out.content, backend_source) != null);
    var paths = std.mem.tokenizeScalar(u8, out.content, '\n');
    var count: usize = 0;
    while (paths.next()) |path| {
        if (!std.mem.startsWith(u8, path, "/virtual/")) continue;
        const expected = pardes.filesystem.sourceBytes(path["/virtual/".len..]) orelse return error.MissingEffectSource;
        const bytes = try pardes.filesystem.read(p, path);
        defer p.gpa.free(bytes);
        try std.testing.expectEqualStrings(expected, bytes);
        count += 1;
    }
    try std.testing.expect(count >= 3);
    const report = p.active;
    pardes.look.lookAt(p, report, backend_source);
    try std.testing.expect(p.active != report);
    const source = p.panes[p.active].?.file.?;
    try std.testing.expectEqualStrings(backend_source, source.path);
    try std.testing.expectEqualStrings(pardes.filesystem.sourceBytes(backend_source["/virtual/".len..]).?, source.content);
}

test "every enabled setting builtin mutates the State Config reports" {
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    try std.testing.expectEqual(config.gui_tagline_font_percent, p.settings.font.tagline_percent);

    var font_arena: std.heap.ArenaAllocator = .init(std.testing.allocator);
    defer font_arena.deinit();
    var chosen_font: ?[]const u8 = null;
    var buf: [512]u8 = undefined;
    for (config.Runtime.settings) |setting| {
        if (!setting.enabled(builtins.capabilities)) continue;
        const command: []const u8 = switch (setting.action) {
            .theme => try std.fmt.bufPrint(&buf, "{s} acme", .{setting.word}),
            .shell => try std.fmt.bufPrint(&buf, "{s} fish", .{setting.word}),
            .tagline_size => try std.fmt.bufPrint(&buf, "{s} 67", .{setting.word}),
            .font => continue,
            else => setting.word,
        };
        try std.testing.expect(p.executeBuiltinLine(p.active, command));
    }
    if (comptime font_picker) {
        const before_invalid = p.settings.font.tagline_percent;
        try std.testing.expect(p.executeBuiltinLine(p.active, "TaglineSize 0"));
        try std.testing.expectEqual(before_invalid, p.settings.font.tagline_percent);
        const installed = fonts.list(font_arena.allocator(), null);
        if (installed.len > 0) {
            chosen_font = installed[0].name;
            const command = try std.fmt.bufPrint(&buf, "Font {s}", .{installed[0].name});
            try std.testing.expect(p.executeBuiltinLine(p.active, command));
        }
    }

    try std.testing.expect(p.executeBuiltinLine(p.active, "Config"));
    const report = p.panes[p.active].?.file.?.content;
    for ([_][]const u8{
        "Colors off\n",
        "Wrap off\n",
        "Tagbottom on\n",
        "Debug on\n",
        "Theme acme\n",
        "Shell requested (new panes) fish\n",
    }) |line| try std.testing.expect(std.mem.indexOf(u8, report, line) != null);
    const transition = if (builtins.capabilities.panel_transitions)
        try std.fmt.bufPrint(&buf, "Panel transition {s}\n", .{
            config.Runtime.findAction(.{ .transition = p.settings.panel_transition }).?.word,
        })
    else
        "Panel transition unsupported\n";
    try std.testing.expect(std.mem.indexOf(u8, report, transition) != null);
    // A bare word turns a bundled pass on at its default level.
    const scene_status = if (builtins.capabilities.scene_shaders) "2" else "unsupported";
    for ([_][]const u8{"Crt"}) |name| {
        const line = try std.fmt.bufPrint(&buf, "{s} {s}\n", .{ name, scene_status });
        try std.testing.expect(std.mem.indexOf(u8, report, line) != null);
    }
    const tagline = if (!builtins.capabilities.tagline_font_size)
        "TaglineSize unsupported\n"
    else
        try std.fmt.bufPrint(&buf, "TaglineSize {d}{s}\n", .{
            p.settings.font.tagline_percent,
            if (builtins.capabilities.font_picker) "" else " (build-time only)",
        });
    try std.testing.expect(std.mem.indexOf(u8, report, tagline) != null);
    if (chosen_font) |name| {
        try std.testing.expect(std.mem.indexOf(u8, report, name) != null);
        try std.testing.expect(std.mem.indexOf(u8, report, "Font pending on\n") != null);
    }
}

fn walkFixture(p: *Pardes, id: usize, cwd: []const u8, pattern: []const u8) !usize {
    const rows = try p.gpa.dupe(u8,
        \\build.zig:1:1 first
        \\(mise.toml) and build.zig.zon:3:2-9 two on one row
        \\nothing look-able on this row at all
        \\uucode_config.zig:7:1 last
        \\
    );
    try panes.Output.fillResults(p, id, cwd, .search, pattern, rows, null);
    return p.panes[id].?.search_pane orelse error.MissingResults;
}

const ProjectPaths = struct { cwd: []const u8, boot: []const u8 };

fn projectPaths(cwd_buf: *[4096]u8, path_buf: *[4096]u8) !ProjectPaths {
    const raw = std.c.getcwd(cwd_buf, cwd_buf.len) orelse return error.GetCwdFailed;
    const cwd = std.mem.span(@as([*:0]u8, @ptrCast(raw)));
    return .{ .cwd = cwd, .boot = try std.fmt.bufPrint(path_buf, "{s}/mise.toml", .{cwd}) };
}

fn selectedOutputText(pane: *const pardes.Pane) ?[]const u8 {
    const file = pane.file orelse return null;
    if (!pane.body.vsel.active or pane.body.vsel.row != pane.body.cur_row or pane.body.cur_row < 0) return null;
    const line = modal.lineSlice(file.content, @intCast(pane.body.cur_row));
    const lo: usize = @intCast(@max(0, @min(pane.body.vsel.col, pane.body.cur_col)));
    const hi: usize = @intCast(@max(0, @max(pane.body.vsel.col, pane.body.cur_col)));
    if (lo >= line.len) return "";
    return line[lo..@min(line.len, hi + 1)];
}

test "n/N in ordinary text skips comment slashes and retains real paths" {
    if (platform == .web) return error.SkipZigTest;
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 100, .rows = 20 });
    defer p.deinit();
    const pane = try p.setTestFile("// ordinary comment\n/// documentation comment\n(//) [///] punctuation\n/\n// /tmp\n//tmp\n");
    try std.testing.expect(pane.file.?.output == null);
    pardes.look.armLookWalk(p, 0);
    const available = p.freeSlot();
    for ([_]struct { key: u21, row: i32, text: []const u8 }{
        .{ .key = 'n', .row = 3, .text = "/" },
        .{ .key = 'n', .row = 4, .text = "/tmp" },
        .{ .key = 'n', .row = 5, .text = "//tmp" },
        .{ .key = 'n', .row = 3, .text = "/" },
        .{ .key = 'N', .row = 5, .text = "//tmp" },
        .{ .key = 'N', .row = 4, .text = "/tmp" },
        .{ .key = 'N', .row = 3, .text = "/" },
    }) |step| {
        p.update(.{ .key = .{ .cp = step.key } });
        try std.testing.expectEqual(@as(usize, 0), p.active);
        try std.testing.expectEqual(step.row, pane.body.cur_row);
        try std.testing.expectEqualStrings(step.text, selectedOutputText(pane) orelse "");
        try std.testing.expectEqual(available, p.freeSlot());
    }
}

test "n/N skips formatted context and selects comment match locations" {
    if (!pardes.syntax.enabled) return error.SkipZigTest;
    for ([_]panes.Output.Origin{ .search, .{ .query = .references } }) |origin| {
        for ([_]bool{ false, true }) |tslocations| {
            const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 100, .rows = 30 });
            defer p.deinit();
            p.locations_config.layout = .@"inline";
            const text = "const Box = struct {\n" ++
                "    pub fn run() void {\n" ++
                "        // /tmp neighboring path\n" ++
                "        // actual match /tmp\n" ++
                "        // / another neighbor\n" ++
                "        call();\n" ++
                "        // /tmp trailing context\n" ++
                "    }\n};\n";
            const source = try p.setTestFile(text);
            p.gpa.free(source.file.?.path);
            source.file.?.path = try p.gpa.dupe(u8, "/look-walk-context.zig");
            p.presentation.enabled = false;
            p.locations_config = .{ .layout = .@"inline", .context = 1, .tscontext = true, .tslocations = tslocations };
            const path = source.file.?.path;
            const input = try std.fmt.allocPrint(p.gpa, "{s}:4:9 {s}\n{s}:6:9 {s}\n", .{
                path, modal.lineSlice(text, 3), path, modal.lineSlice(text, 5),
            });
            try panes.Output.fillResults(p, 0, "/", origin, "walk", input, null);
            const id = source.search_pane.?;
            const result = p.panes[id].?;
            const file = &result.file.?;
            var matches: [2]usize = undefined;
            var count: usize = 0;
            for (file.location_rows, 0..) |row, index| {
                if (row.kind != .match) continue;
                matches[count] = index;
                count += 1;
            }
            try std.testing.expectEqual(@as(usize, 2), count);
            const available = p.freeSlot();
            for ([_]struct { key: u21, match: usize }{
                .{ .key = 'n', .match = 0 },
                .{ .key = 'n', .match = 1 },
                .{ .key = 'n', .match = 0 },
                .{ .key = 'N', .match = 1 },
                .{ .key = 'N', .match = 0 },
            }) |step| {
                p.update(.{ .key = .{ .cp = step.key } });
                try std.testing.expectEqual(id, p.active);
                const row = matches[step.match];
                try std.testing.expectEqual(@as(i32, @intCast(row)), result.body.cur_row);
                const line = modal.lineSlice(file.content, row);
                try std.testing.expectEqualStrings(line[0..file.location_rows[row].location_end], selectedOutputText(result) orelse "");
                try std.testing.expectEqual(available, p.freeSlot());
            }
            try pardes.dump.dumpState(p);
            const restored = try pardes.dump.initFromDump(p.gpa, .{ .tty_only = true }, p.dump_out.?);
            defer restored.deinit();
            pardes.look.armLookWalk(restored, id);
            const restored_result = restored.panes[id].?;
            // The dot came back on the match it was on (the first), so the
            // walk goes on from there.
            try std.testing.expectEqual(@as(i32, @intCast(matches[0])), restored_result.body.cur_row);
            restored.update(.{ .key = .{ .cp = 'n' } });
            try std.testing.expectEqual(@as(i32, @intCast(matches[1])), restored_result.body.cur_row);
            restored.update(.{ .key = .{ .cp = 'N' } });
            try std.testing.expectEqual(@as(i32, @intCast(matches[0])), restored_result.body.cur_row);
            const restored_file = &restored_result.file.?;
            const last = modal.lineSlice(restored_file.content, matches[0]);
            try std.testing.expectEqualStrings(last[0..restored_file.location_rows[matches[0]].location_end], selectedOutputText(restored_result) orelse "");
        }
    }
}

test "n/N selects one output location per row and opens nothing" {
    if (platform == .web) return;
    var cwd_buf: [4096]u8 = undefined;
    var path_buf: [4096]u8 = undefined;
    const paths = try projectPaths(&cwd_buf, &path_buf);
    const p = try Pardes.init(std.testing.allocator, .{ .cols = 100, .rows = 40, .file = paths.boot });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    p.update(.{ .resize = .{ .cols = 100, .rows = 40 } });
    const rid = try walkFixture(p, p.active, paths.cwd, "one");
    const results = p.panes[rid].?;
    const panes_before = p.freeSlot();

    p.update(.{ .key = .{ .cp = 'n' } });
    try std.testing.expectEqual(rid, p.active);
    try std.testing.expectEqual(panes_before, p.freeSlot());
    try std.testing.expect(results.body.vsel.active and results.body.vsel.explicit);
    try std.testing.expectEqualStrings("build.zig:1:1", selectedOutputText(results) orelse "");
    try std.testing.expectEqual(panes.Output.Grain.line, panes.Output.grain(results.file.?.output));

    p.update(.{ .key = .{ .cp = 'n' } });
    try std.testing.expectEqual(@as(i32, 1), results.body.cur_row);
    try std.testing.expectEqualStrings("mise.toml", selectedOutputText(results) orelse "");
    p.update(.{ .key = .{ .cp = 'n' } });
    try std.testing.expectEqual(@as(i32, 3), results.body.cur_row); // row 2 is not look-able
    try std.testing.expectEqualStrings("uucode_config.zig:7:1", selectedOutputText(results) orelse "");
    p.update(.{ .key = .{ .cp = 'n' } });
    try std.testing.expectEqual(@as(i32, 0), results.body.cur_row); // ring seam

    p.update(.{ .key = .{ .cp = Key.enter } });
    try std.testing.expect(p.freeSlot() != panes_before);
    try std.testing.expect(std.mem.endsWith(u8, p.panes[p.active].?.file.?.path, "/build.zig"));
    try std.testing.expectEqual(panes.Output.Grain.word, panes.Output.grain(p.panes[p.active].?.file.?.output));
}

test "n/N resumes the result output whose Look moved focus away" {
    if (platform == .web) return;
    var tmp = std.testing.tmpDir(.{});
    defer tmp.cleanup();
    try tmp.dir.writeFile(std.testing.io, .{
        .sub_path = "look-owner.txt",
        .data = "alpha target\nbeta target\ngamma target\n",
    });
    var path_buf: [256]u8 = undefined;
    const path = try std.fmt.bufPrint(&path_buf, ".zig-cache/tmp/{s}/look-owner.txt", .{tmp.sub_path});
    const p = try Pardes.init(std.testing.allocator, .{ .file = path, .cols = 80, .rows = 24 });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    p.settings.look_word = .list; // the +Search listing is what is walked

    try std.testing.expect(p.executeBuiltinLine(0, "Look target"));
    const rid = p.panes[0].?.search_pane orelse return error.MissingResults;
    const results = p.panes[rid].?;
    const first = results.body.cur_row;
    try std.testing.expectEqual(@as(usize, 0), p.active);
    try std.testing.expect(results.look_at != null);
    try std.testing.expectEqual(results.serial, p.look_walk_owner orelse return error.MissingLookOwner);

    p.update(.{ .key = .{ .cp = 'n' } });
    try std.testing.expectEqual(rid, p.active);
    try std.testing.expectEqual(first + 1, results.body.cur_row);
    p.update(.{ .key = .{ .cp = 'N' } });
    try std.testing.expectEqual(first, results.body.cur_row);

    // A later no-match answer has no position to resume and therefore cannot
    // steal the provenance established by the Look above.
    const owner = results.serial;
    const dir = std.fs.path.dirname(path) orelse ".";
    try panes.Output.fillResults(
        p,
        0,
        dir,
        .search,
        "no-such-result",
        try p.gpa.dupe(u8, ""),
        null,
    );
    try std.testing.expectEqual(owner, p.look_walk_owner.?);
    p.update(.{ .key = .{ .cp = 'n' } });
    try std.testing.expectEqual(rid, p.active);
    try std.testing.expectEqual(first + 1, results.body.cur_row);

    // Emptying the owner itself keeps its identity as the ring's starting
    // point. Deleting it then leaves a stale serial, never an id that can bind
    // to the unrelated pane subsequently allocated in the same slot.
    try panes.Output.fillResults(p, 0, dir, .search, "target", try p.gpa.dupe(u8, ""), null);
    try std.testing.expectEqual(owner, p.look_walk_owner.?);
    try std.testing.expect(p.executeBuiltinLine(rid, "Del"));
    try std.testing.expect(p.paneBySerial(owner) == null);
    const replacement = try p.newShell(rid, "");
    try std.testing.expect(replacement.serial != owner);
    try std.testing.expect(p.paneBySerial(owner) == null);
}

test "N exactly reverses n across output panes and the ring seam" {
    if (platform == .web) return;
    var cwd_buf: [4096]u8 = undefined;
    var path_buf: [4096]u8 = undefined;
    const paths = try projectPaths(&cwd_buf, &path_buf);
    const p = try Pardes.init(std.testing.allocator, .{ .cols = 100, .rows = 40, .file = paths.boot });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    p.update(.{ .resize = .{ .cols = 100, .rows = 40 } });
    const first = try walkFixture(p, p.active, paths.cwd, "one");
    p.update(.{ .key = .{ .cp = 'n', .alt = true } });
    const second = try walkFixture(p, p.active, paths.cwd, "two");
    try std.testing.expect(first != second);

    const Mark = struct { pane: usize, row: i32, col: i32 };
    const here = struct {
        fn at(pp: *Pardes) Mark {
            const pane = pp.panes[pp.active].?;
            return .{ .pane = pp.active, .row = pane.body.cur_row, .col = pane.body.cur_col };
        }
    }.at;
    p.update(.{ .key = .{ .cp = 'n' } });
    const base = here(p);
    var trail: [12]Mark = undefined;
    for (&trail) |*mark| {
        p.update(.{ .key = .{ .cp = 'n' } });
        mark.* = here(p);
    }
    var i = trail.len;
    while (i > 0) {
        i -= 1;
        p.update(.{ .key = .{ .cp = 'N' } });
        const want = if (i == 0) base else trail[i - 1];
        try std.testing.expectEqual(want, here(p));
    }
    var saw_first = false;
    var saw_second = false;
    for (trail) |mark| {
        saw_first = saw_first or mark.pane == first;
        saw_second = saw_second or mark.pane == second;
    }
    try std.testing.expect(saw_first and saw_second);
}

test "Themes lists the ring in sections and skips headings in both directions" {
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 100, .rows = 40 });
    defer p.deinit();
    const source = try p.setTestFile("notes\n");
    pardes.colors.setThemeIndex(p, pardes.themes.len - 1);
    const original_theme = p.settings.theme;
    try std.testing.expect(p.executeBuiltinLine(0, "Themes"));
    const tid = source.search_pane orelse return error.MissingThemeList;
    const list = p.panes[tid].?;
    const content = list.file.?.content;
    try std.testing.expectEqual(@as(usize, 0), p.active);
    try std.testing.expectEqual(@as(i32, 0), list.body.cur_row);
    try std.testing.expectEqual(@as(usize, 0), list.file.?.scroll);
    try std.testing.expectEqualStrings("# Pardes themes", modal.lineSlice(content, 0));
    // Every theme in ring order, each section's heading after a blank line
    // where colors.groupAt says one starts.
    var row: usize = 1;
    var sections: usize = 1;
    var first_break: ?usize = null;
    for (pardes.themes, 0..) |theme, i| {
        if (i > 0) if (pardes.colors.groupAt(i)) |title| {
            try std.testing.expectEqualStrings("", modal.lineSlice(content, row));
            try std.testing.expect(std.mem.startsWith(u8, modal.lineSlice(content, row + 1), "# "));
            try std.testing.expectEqualStrings(title, modal.lineSlice(content, row + 1)["# ".len..]);
            row += 2;
            sections += 1;
            if (first_break == null) first_break = i;
        };
        const line = modal.lineSlice(content, row);
        try std.testing.expect(std.mem.startsWith(u8, line, "Theme "));
        try std.testing.expectEqualStrings(theme.name, line["Theme ".len..]);
        row += 1;
    }
    try std.testing.expectEqual(pardes.themes.len + 1 + 2 * (sections - 1), std.mem.count(u8, content, "\n"));
    // acme is a current theme: it is listed before any break.
    const acme = for (pardes.themes, 0..) |t, i| {
        if (std.mem.eql(u8, t.name, "acme")) break i;
    } else return error.MissingAcme;
    const brk = first_break orelse return error.NoSections;
    try std.testing.expect(acme < brk);
    // Opening an imported theme's selector must still begin with the natives.
    // Walk across the section break without selecting or executing a heading.
    for (pardes.themes[0 .. brk + 1]) |theme| {
        p.update(.{ .key = .{ .cp = 'n' } });
        try std.testing.expectEqual(tid, p.active);
        const selected = selectedOutputText(list) orelse return error.MissingThemeSection;
        try std.testing.expectEqualStrings(theme.name, selected["Theme ".len..]);
        try std.testing.expectEqual(original_theme, p.settings.theme);
    }
    p.update(.{ .key = .{ .cp = 'N' } });
    const previous = selectedOutputText(list) orelse return error.MissingThemeSection;
    try std.testing.expectEqualStrings(pardes.themes[brk - 1].name, previous["Theme ".len..]);
    p.update(.{ .key = .{ .cp = Key.tab } });
    try std.testing.expectEqual(brk - 1, p.settings.theme);
}

test "n/N selects command outputs by whole row" {
    if (platform == .web) return;
    var cwd_buf: [4096]u8 = undefined;
    var path_buf: [4096]u8 = undefined;
    const paths = try projectPaths(&cwd_buf, &path_buf);
    const p = try Pardes.init(std.testing.allocator, .{ .cols = 100, .rows = 40, .file = paths.boot });
    defer p.deinit();
    p.update(.{ .resize = .{ .cols = 100, .rows = 40 } });

    try std.testing.expect(p.executeBuiltinLine(p.active, "Themes"));
    const tid = p.panes[p.active].?.search_pane orelse return error.MissingThemeList;
    const themes = p.panes[tid].?;
    try std.testing.expect(panes.Output.fileTraits(themes.file.?.output).commands);
    p.update(.{ .key = .{ .cp = 'n' } });
    const row0 = std.mem.trimEnd(u8, modal.lineSlice(themes.file.?.content, 1), " \t\r");
    try std.testing.expectEqualStrings(row0, selectedOutputText(themes) orelse "");
    const theme_before = p.settings.theme;
    p.update(.{ .key = .{ .cp = 'n' } });
    p.update(.{ .key = .{ .cp = Key.tab } });
    try std.testing.expect(p.settings.theme != theme_before);

    try std.testing.expect(p.executeBuiltinLine(0, "Look build.zig"));
    p.update(.tick);
    try std.testing.expect(p.active != 0);
    p.update(.{ .key = .{ .cp = 'n' } });
    try std.testing.expectEqual(@as(usize, 0), p.active);
}

test "identical result refresh keeps warm content caches without allocation" {
    var allocator: std.testing.FailingAllocator = .init(std.testing.allocator, .{});
    const p = try Pardes.init(allocator.allocator(), .{ .tty_only = true, .cols = 80, .rows = 24 });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    const source = try p.setTestFile("notes\n");
    p.settings.colors = true;
    const text = "a.zig:1:1 pub fn first() void {}\na.zig:2:1 if (true) return;\n";
    try panes.Output.fillResults(p, 0, "/tmp", .{ .query = .references }, "before", try p.gpa.dupe(u8, text), 0);
    const id = source.search_pane orelse return error.MissingResults;
    const result = p.panes[id].?;
    const file = &result.file.?;
    result.body.cur_row = 1;
    result.body.cur_col = 12;
    result.body.vsel = .{ .active = true, .explicit = true, .row = 0, .col = 2 };
    result.body.select = true;
    file.scroll = 1;
    result.hscroll = 3;
    panes.File.refreshHighlights(p);
    const index = try panes.File.lineIndex(p.gpa, file);
    const styles = try std.testing.allocator.dupe(u8, file.highlights);
    defer std.testing.allocator.free(styles);
    if (@import("pardes_config").syntax_zig_grammar) try std.testing.expect(styles.len > 0);
    const revision = file.revision;
    const saved_revision = file.saved_revision;
    const body_ptr = file.content.ptr;
    const style_ptr = file.highlights.ptr;
    const highlight_start = file.highlight_start;
    const selected = result.body.vsel;
    const event_node = pardes.ctlfs.Node.of(result.serial, .event);
    const opened = pardes.ctlfs.handle(p, .{ .tag = 0, .op = .open, .node = event_node });
    try std.testing.expectEqual(.ok, opened.status);
    defer _ = pardes.ctlfs.handle(p, .{ .tag = 0, .op = .release, .node = event_node, .handle = opened.handle });

    for (0..32) |_| {
        const incoming = try p.gpa.dupe(u8, text);
        const allocations = allocator.allocations;
        const freed = allocator.freed_bytes;
        const deallocations = allocator.deallocations;
        allocator.fail_index = allocator.alloc_index;
        defer allocator.fail_index = std.math.maxInt(usize);
        p.active = id;
        source.search_pane = null;
        source.search_row = null;
        p.look_walk_owner = null;
        try panes.Output.fillResults(p, 0, "/tmp", .{ .query = .references }, "after", incoming, 1);
        try std.testing.expectEqual(revision, file.revision);
        try std.testing.expectEqual(saved_revision, file.saved_revision);
        try std.testing.expectEqual(body_ptr, file.content.ptr);
        try std.testing.expectEqual(index.ptr, file.line_starts.ptr);
        try std.testing.expectEqual(style_ptr, file.highlights.ptr);
        try std.testing.expectEqual(highlight_start, file.highlight_start);
        try std.testing.expectEqualSlices(u8, styles, file.highlights);
        try std.testing.expect(!file.syntax_dirty);
        panes.File.refreshHighlights(p);
        try std.testing.expectEqual(allocations, allocator.allocations);
        try std.testing.expectEqual(freed + text.len, allocator.freed_bytes);
        try std.testing.expectEqual(deallocations + 1, allocator.deallocations);
        try std.testing.expect(!allocator.has_induced_failure);
        try std.testing.expectEqual(selected, result.body.vsel);
        try std.testing.expect(result.body.select);
        try std.testing.expectEqual(@as(i32, 1), result.body.cur_row);
        try std.testing.expectEqual(@as(i32, 12), result.body.cur_col);
        try std.testing.expectEqual(@as(usize, 1), file.scroll);
        try std.testing.expectEqual(@as(i32, 3), result.hscroll);
        try std.testing.expectEqualStrings("after", file.output.?.arg());
        try std.testing.expectEqual(@as(usize, 0), p.active);
        try std.testing.expectEqual(id, source.search_pane.?);
        try std.testing.expectEqual(@as(usize, 1), source.search_row.?);
        try std.testing.expectEqual(result.serial, p.look_walk_owner.?);
        try std.testing.expect(p.panes[id].?.fs.events.empty());
    }

    try panes.Output.fillResults(p, 0, "/tmp", .{ .query = .references }, "changed", try p.gpa.dupe(u8, "short\n"), null);
    try std.testing.expectEqual(revision + 1, file.revision);
    try std.testing.expectEqualStrings("short\n", file.content);
    try std.testing.expectEqualStrings("changed", file.output.?.arg());
    // The warm index is carried through the edit, not dropped.
    try std.testing.expectEqualSlices(usize, &.{ 0, 6 }, file.line_starts);
    try std.testing.expectEqual(@as(usize, 0), file.highlights.len);
    try std.testing.expect(file.syntax_dirty);
    try std.testing.expect(!result.body.vsel.active and !result.body.select);
    try std.testing.expectEqual(@as(i32, 0), result.body.cur_row);
    try std.testing.expectEqual(@as(i32, 0), result.body.cur_col);
    try std.testing.expectEqual(@as(usize, 0), file.scroll);
    try std.testing.expectEqual(@as(i32, 0), result.hscroll);
    try std.testing.expect(source.search_row == null);
    const events = &p.panes[id].?.fs.events;
    try std.testing.expect(std.mem.startsWith(u8, events.peek().?, "KD"));
    events.pop();
    try std.testing.expect(std.mem.startsWith(u8, events.peek().?, "KI"));
    events.pop();
    try std.testing.expect(events.empty());
}

test "rejected result refresh frees incoming text and leaves the existing output intact" {
    var allocator: std.testing.FailingAllocator = .init(std.testing.allocator, .{});
    const p = try Pardes.init(allocator.allocator(), .{ .tty_only = true, .cols = 80, .rows = 24 });
    defer p.deinit();
    p.locations_config.layout = .@"inline";
    const source = try p.setTestFile("notes\n");
    try panes.Output.fillResults(p, 0, "/tmp", .{ .query = .references }, "before", try p.gpa.dupe(u8, "keep\n"), 1);
    const id = source.search_pane.?;
    const result = p.panes[id].?;
    const file = &result.file.?;
    const body_ptr = file.content.ptr;
    const revision = file.revision;
    const free_slot = p.freeSlot();
    var oversized: [panes.Output.max_arg + 1]u8 = @splat('x');
    for ([_]bool{ false, true }) |oom| {
        const incoming = try p.gpa.dupe(u8, "discard\n");
        const freed = allocator.freed_bytes;
        const deallocations = allocator.deallocations;
        if (oom) allocator.fail_index = allocator.alloc_index;
        defer allocator.fail_index = std.math.maxInt(usize);
        try std.testing.expectError(if (oom) error.OutOfMemory else error.ArgumentTooLong, panes.Output.fillResults(
            p,
            0,
            "/tmp",
            if (oom) .search else .{ .query = .references },
            if (oom) "new output" else &oversized,
            incoming,
            0,
        ));
        try std.testing.expectEqual(freed + "discard\n".len, allocator.freed_bytes);
        try std.testing.expectEqual(deallocations + 1, allocator.deallocations);
        try std.testing.expectEqual(body_ptr, file.content.ptr);
        try std.testing.expectEqual(revision, file.revision);
        try std.testing.expectEqualStrings("keep\n", file.content);
        try std.testing.expectEqualStrings("before", file.output.?.arg());
        try std.testing.expectEqual(free_slot, p.freeSlot());
        try std.testing.expectEqual(id, source.search_pane.?);
        try std.testing.expectEqual(@as(usize, 1), source.search_row.?);
        try std.testing.expectEqual(@as(usize, 0), p.active);
    }
    try std.testing.expect(allocator.has_induced_failure);
}

test "Look ignores slash-only comment markers while retaining root and real paths" {
    const look = pardes.look;
    var realbuf: [4096]u8 = undefined;
    for ([_][]const u8{ "//", "///", "////", "//:12" }) |marker| {
        try std.testing.expect(look.resolve(null, marker, ".", &realbuf) == .none);
        try std.testing.expectEqual(@as(?look.Span, null), look.wordSpan(null, marker, ".", &realbuf));
    }
    for ([_][]const u8{ "(//),", "///!" }) |marker|
        try std.testing.expectEqual(@as(?look.Span, null), look.wordSpan(null, marker, ".", &realbuf));
    try std.testing.expectEqual(@as(?look.Span, null), look.lineSpan(null, "  // ordinary comment", ".", &realbuf));
    if (platform == .web) return;
    try std.testing.expect(look.resolve(null, "/", ".", &realbuf) == .dir);
    try std.testing.expect(look.wordSpan(null, "/", ".", &realbuf) != null);
    var pathbuf: [4096]u8 = undefined;
    const cwd = pathbuf[0..try std.process.currentPath(std.testing.io, &pathbuf)];
    const doubled = try std.fmt.allocPrint(std.testing.allocator, "/{s}", .{cwd});
    defer std.testing.allocator.free(doubled);
    try std.testing.expect(look.resolve(null, doubled, ".", &realbuf) == .dir);
    try std.testing.expect(look.resolve(null, "https://example.com/path", ".", &realbuf) == .url);
}

test "result alignment chunks keep seventeen matches independent and refresh stable" {
    for ([_]panes.Output.Origin{ .search, .{ .query = .references } }) |origin| {
        for ([_]usize{ 7, 8 }) |long_at| {
            const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
            defer p.deinit();
            p.locations_config.layout = .@"inline";
            const source = try p.setTestFile("notes\n");
            p.locations_config = .{ .layout = .@"inline", .context = 0, .tscontext = false };
            var input: std.ArrayList(u8) = .empty;
            defer input.deinit(p.gpa);
            var widths: [17]usize = undefined;
            for (0..17) |reverse| {
                const index = 16 - reverse;
                const label = try std.fmt.allocPrint(p.gpa, "/r{d:0>2}{s}.zig:3:1", .{ index, if (index == long_at) "-界-very-long-path-name" else "-é" });
                defer p.gpa.free(label);
                widths[index] = panes.File.displayWidth(label);
                try input.appendSlice(p.gpa, label);
                try input.appendSlice(p.gpa, " \t  return 7;\n");
            }
            try panes.Output.fillResults(p, 0, "/", origin, "chunks", try p.gpa.dupe(u8, input.items), 0);
            const result_id = source.search_pane.?;
            const result = p.panes[result_id].?;
            const file = &result.file.?;
            try std.testing.expectEqual(@as(usize, 17), file.location_rows.len);
            try std.testing.expectEqual(@as(usize, 16), source.search_row.?);
            var starts: [17]usize = undefined;
            for (file.location_rows, 0..) |row, index| {
                const line = modal.lineSlice(file.content, index);
                const first = index / 8 * 8;
                var width: usize = 0;
                for (widths[first..@min(first + 8, widths.len)]) |label_width| width = @max(width, label_width);
                try std.testing.expectEqual(width, panes.File.displayWidth(line[0 .. row.code_start - 1]));
                try std.testing.expectEqual(@as(u8, '\t'), line[row.code_start - 1]);
                try std.testing.expectEqualStrings("\t  return 7;", line[row.code_start..]);
                try std.testing.expectEqualStrings(row.path, line[0 .. row.location_end - ":3:1".len]);
                starts[index] = row.code_start;
            }
            const content = file.content.ptr;
            const revision = file.revision;
            const index = try panes.File.lineIndex(p.gpa, file);
            result.body.cur_row = 8;
            result.body.cur_col = @intCast(file.location_rows[8].code_start);
            try panes.Output.fillResults(p, 0, "/", origin, "chunks", try p.gpa.dupe(u8, input.items), 8);
            try std.testing.expectEqual(result_id, source.search_pane.?);
            try std.testing.expectEqual(content, file.content.ptr);
            try std.testing.expectEqual(revision, file.revision);
            try std.testing.expectEqual(index.ptr, file.line_starts.ptr);
            try std.testing.expectEqual(@as(usize, 8), source.search_row.?);
            try std.testing.expectEqual(@as(i32, 8), result.body.cur_row);
            for (file.location_rows, starts) |row, start| try std.testing.expectEqual(start, row.code_start);

            // Simulate a restored view made by the previous global-padding
            // formatter. Its metadata still describes the same result bytes.
            const expected = try p.gpa.dupe(u8, file.content);
            defer p.gpa.free(expected);
            var global_width: usize = 0;
            for (widths) |width| global_width = @max(global_width, width);
            var legacy: std.ArrayList(u8) = .empty;
            defer legacy.deinit(p.gpa);
            for (file.location_rows, 0..) |*row, row_index| {
                const line = modal.lineSlice(file.content, row_index);
                const label = line[0..row.location_end];
                const code = line[row.code_start..];
                try legacy.appendSlice(p.gpa, label);
                const padding = global_width - panes.File.displayWidth(label);
                try legacy.appendNTimes(p.gpa, ' ', padding);
                try legacy.append(p.gpa, '\t');
                try legacy.appendSlice(p.gpa, code);
                try legacy.append(p.gpa, '\n');
                row.code_start = row.location_end + padding + 1;
            }
            const retained_rows = file.location_rows;
            file.location_rows = &.{};
            panes.File.setContent(p, file, try legacy.toOwnedSlice(p.gpa));
            file.location_rows = retained_rows;
            try std.testing.expect(!std.mem.eql(u8, expected, file.content));
            try panes.Output.fillResults(p, 0, "/", origin, "chunks", try p.gpa.dupe(u8, input.items), 8);
            try std.testing.expectEqual(result_id, source.search_pane.?);
            try std.testing.expectEqualStrings(expected, file.content);
            for (file.location_rows, starts) |row, start| try std.testing.expectEqual(start, row.code_start);
        }
    }
}

test "result alignment chunks assign boundary context to nearest match with previous ties" {
    for ([_]panes.Output.Origin{ .search, .{ .query = .references } }) |origin| {
        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
        defer p.deinit();
        p.locations_config.layout = .@"inline";
        var source_text: std.ArrayList(u8) = .empty;
        defer source_text.deinit(p.gpa);
        for (0..14) |_| try source_text.appendSlice(p.gpa, "\t  source();\n");
        const source = try p.setTestFile(source_text.items);
        p.gpa.free(source.file.?.path);
        source.file.?.path = try p.gpa.dupe(u8, "/chunk-boundary-界.txt");
        p.locations_config = .{ .layout = .@"inline", .context = 2, .tscontext = false };
        var input: std.ArrayList(u8) = .empty;
        defer input.deinit(p.gpa);
        for ([_]usize{ 1, 2, 3, 4, 5, 6, 7, 8, 12 }) |line| {
            const entry = try std.fmt.allocPrint(p.gpa, "{s}:{d}:1 \t  source();\n", .{ source.file.?.path, line });
            defer p.gpa.free(entry);
            try input.appendSlice(p.gpa, entry);
        }
        try panes.Output.fillResults(p, 0, "/", origin, "context chunks", try p.gpa.dupe(u8, input.items), 8);
        const file = &p.panes[source.search_pane.?].?.file.?;
        try std.testing.expectEqual(@as(usize, 14), file.location_rows.len);
        try std.testing.expectEqual(@as(usize, 11), source.search_row.?);
        const first_label = try std.fmt.allocPrint(p.gpa, "{s}:8:1", .{source.file.?.path});
        defer p.gpa.free(first_label);
        const next_label = try std.fmt.allocPrint(p.gpa, "{s}:12:1", .{source.file.?.path});
        defer p.gpa.free(next_label);
        for (file.location_rows, 0..) |row, index| {
            const line = modal.lineSlice(file.content, index);
            try std.testing.expectEqual(index + 1, row.at.line);
            const expected = if (row.at.line <= 10) first_label else next_label;
            try std.testing.expectEqual(panes.File.displayWidth(expected), panes.File.displayWidth(line[0 .. row.code_start - 1]));
            try std.testing.expectEqualStrings("\t  source();", line[row.code_start..]);
            if (row.at.line >= 9 and row.at.line != 12) {
                try std.testing.expectEqual(.context, row.kind);
                try std.testing.expectEqual(@as(usize, 0), row.location_end);
            } else try std.testing.expectEqual(.match, row.kind);
        }
    }
}

test "declaration context ellipses mark only final header lines before omitted source" {
    if (!pardes.syntax.enabled) return error.SkipZigTest;
    const text = "const Outer = struct {\n" ++
        "\n" ++
        "    pub fn run(\n" ++
        "        value: u32,\n" ++
        "    ) void {\n" ++
        "        const skipped = 1;\n" ++
        "        const Inner = struct {\n" ++
        "            pub fn inner(\n" ++
        "                input: u32,\n" ++
        "            ) void {\n" ++
        "                // neighboring source\n" ++
        "                _ = input;\n" ++
        "                // trailing neighbor\n" ++
        "            }\n" ++
        "        };\n" ++
        "        _ = value;\n" ++
        "    }\n" ++
        "};\n";
    for ([_]panes.Output.Origin{ .search, .{ .query = .references } }) |origin| {
        for ([_]bool{ false, true }) |visible| {
            for ([_]u8{ 0, 1 }) |neighbors| {
                const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
                defer p.deinit();
                p.locations_config.layout = .@"inline";
                const source = try p.setTestFile(text);
                p.gpa.free(source.file.?.path);
                source.file.?.path = try p.gpa.dupe(u8, "/ellipsis-context.zig");
                p.locations_config = .{ .layout = .@"inline", .context = neighbors, .tscontext = true, .tslocations = visible };
                const input = try std.fmt.allocPrint(p.gpa, "{s}:12:17 {s}\n{s}:16:9 {s}\n", .{
                    source.file.?.path, modal.lineSlice(text, 11), source.file.?.path, modal.lineSlice(text, 15),
                });
                try panes.Output.fillResults(p, 0, "/", origin, "ellipsis", input, 1);
                const file = &p.panes[source.search_pane.?].?.file.?;
                var marked: usize = 0;
                var matches: usize = 0;
                var continuation_lines: usize = 0;
                for (file.location_rows, 0..) |row, index| {
                    const shown = modal.lineSlice(file.content, index);
                    const original = modal.lineSlice(text, row.at.line - 1);
                    const expected_mark = row.at.line == 1 or row.at.line == 5 or (neighbors == 0 and row.at.line == 10);
                    if (expected_mark) {
                        try std.testing.expect(row.kind == .context and row.declaration);
                        try std.testing.expectEqualStrings(original, shown[row.code_start .. shown.len - " ...".len]);
                        try std.testing.expect(std.mem.endsWith(u8, shown, " ..."));
                        marked += 1;
                    } else try std.testing.expectEqualStrings(original, shown[row.code_start..]);
                    if (row.at.line == 4 or row.at.line == 9) continuation_lines += 1;
                    if (row.kind == .match) {
                        matches += 1;
                        try std.testing.expect(row.location_end > 0);
                        if (row.at.line == 16) try std.testing.expectEqual(index, source.search_row.?);
                    } else if (row.declaration) {
                        const first_line = row.at.line == 1 or row.at.line == 3 or row.at.line == 7 or row.at.line == 8;
                        try std.testing.expectEqual(visible and first_line, row.location_end > 0);
                        try std.testing.expectEqualStrings(source.file.?.path, row.path);
                        if (!first_line) try std.testing.expect(std.mem.indexOf(u8, shown[0..row.code_start], row.path) == null);
                    } else try std.testing.expectEqual(@as(usize, 0), row.location_end);
                }
                try std.testing.expectEqual(@as(usize, if (neighbors == 0) 3 else 2), marked);
                try std.testing.expectEqual(@as(usize, 2), matches);
                try std.testing.expectEqual(@as(usize, 2), continuation_lines);
                try std.testing.expectEqualStrings(text, source.file.?.content);
            }
        }
    }
}

test "LSP occurrence tint follows the supplied source span through context" {
    const snippet = "\tfoo + 界 + foo;";
    const text = "const Box = struct {\n    fn run() void {\n" ++ snippet ++ "\n        foo();\n    }\n};\n";
    for ([_]pardes.lsp.Kind{ .references, .definition }) |kind| {
        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 160, .rows = 40 });
        defer p.deinit();
        p.locations_config.layout = .@"inline";
        const source = try p.setTestFile(text);
        p.gpa.free(source.file.?.path);
        source.file.?.path = try p.gpa.dupe(u8, "/occurrence.zig");
        p.locations_config = .{ .layout = .@"inline", .context = 1, .tscontext = true };
        p.presentation.enabled = false;
        var input: std.Io.Writer.Allocating = .init(p.gpa);
        defer input.deinit();
        const start = std.mem.lastIndexOf(u8, snippet, "foo").?;
        try pardes.lsp.sourceSpanRow(&input.writer, source.file.?.path, 2, start, 2, start + 3, snippet);
        try panes.Output.fillResults(p, 0, "/", .{ .query = kind }, "", try input.toOwnedSlice(), 0);
        const id = source.search_pane.?;
        const file = &p.panes[id].?.file.?;
        var matches: usize = 0;
        for (file.location_rows, 0..) |row, index| {
            if (row.kind != .match) continue;
            const line = modal.lineSlice(file.content, index);
            try std.testing.expectEqualStrings(snippet, line[row.code_start..]);
            try std.testing.expectEqual(start + 1, row.at.col);
            try std.testing.expectEqual(start + 3, row.at.end_col);
            matches += 1;
        }
        try std.testing.expectEqual(@as(usize, 1), matches);
        pardes.layout.compute(p);
        var frame = std.heap.ArenaAllocator.init(p.gpa);
        defer frame.deinit();
        const surface = try p.render(frame.allocator());
        const chrome = pardes.ChromeTheme.fromTheme(p.theme());
        var marked: usize = 0;
        for (surface.cells) |cell| {
            if (!std.meta.eql(cell.style.bg, pardes.Color{ .rgb = chrome.search_bg })) continue;
            try std.testing.expect(cell.text[0] == 'f' or cell.text[0] == 'o');
            marked += 1;
        }
        try std.testing.expectEqual(@as(usize, 3), marked);
        try std.testing.expectEqualStrings(text, source.file.?.content);
    }
}

test "result context upper bound stops at earliest enclosing declaration" {
    if (!pardes.syntax.enabled) return error.SkipZigTest;
    const text = "// unrelated prelude\n" ++
        "const unrelated = 1;\n" ++
        "\n" ++
        "const Outer = struct {\n" ++
        "    pub fn run(\n" ++
        "        value: u32,\n" ++
        "    ) void {\n" ++
        "        _ = value;\n" ++
        "    }\n" ++
        "};\n" ++
        "// trailing context remains available";
    for ([_]panes.Output.Origin{ .search, .{ .query = .references } }) |origin| {
        for ([_]bool{ false, true }) |tscontext| {
            for ([_]bool{ false, true }) |visible| {
                const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
                defer p.deinit();
                p.locations_config.layout = .@"inline";
                const source = try p.setTestFile(text);
                p.gpa.free(source.file.?.path);
                source.file.?.path = try p.gpa.dupe(u8, "/bounded-context.zig");
                p.locations_config = .{ .layout = .@"inline", .context = 100, .tscontext = tscontext, .tslocations = visible };
                const input = try std.fmt.allocPrint(p.gpa, "{s}:8:13 {s}\n", .{ source.file.?.path, modal.lineSlice(text, 7) });
                try panes.Output.fillResults(p, 0, "/", origin, "upper bound", input, 0);
                const file = &p.panes[source.search_pane.?].?.file.?;
                const first: usize = if (tscontext) 4 else 1;
                try std.testing.expectEqual(first, file.location_rows[0].at.line);
                try std.testing.expectEqual(@as(usize, 11), file.location_rows[file.location_rows.len - 1].at.line);
                try std.testing.expectEqual(@as(usize, 8) - first, source.search_row.?);
                var matches: usize = 0;
                for (file.location_rows, 0..) |row, index| {
                    try std.testing.expectEqual(first + index, row.at.line);
                    try std.testing.expectEqualStrings(modal.lineSlice(text, row.at.line - 1), modal.lineSlice(file.content, index)[row.code_start..]);
                    if (row.kind == .match) {
                        try std.testing.expectEqual(@as(usize, 8), row.at.line);
                        matches += 1;
                    }
                }
                try std.testing.expectEqual(@as(usize, 1), matches);
                try std.testing.expectEqualStrings(text, source.file.?.content);
            }
        }
    }

    // A top-level comment has no enclosing declaration, and a plain-text
    // file has no grammar. Neither should lose its preceding ordinary rows.
    for ([_][]const u8{ "/no-ancestor.zig", "/no-grammar.txt" }) |path| {
        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
        defer p.deinit();
        p.locations_config.layout = .@"inline";
        const plain = "// first\n// second\n// matched\n// trailing";
        const source = try p.setTestFile(plain);
        p.gpa.free(source.file.?.path);
        source.file.?.path = try p.gpa.dupe(u8, path);
        p.locations_config = .{ .layout = .@"inline", .context = 100, .tscontext = true, .tslocations = false };
        const input = try std.fmt.allocPrint(p.gpa, "{s}:3:4 // matched\n", .{path});
        try panes.Output.fillResults(p, 0, "/", .search, "unbounded", input, 0);
        const file = &p.panes[source.search_pane.?].?.file.?;
        try std.testing.expectEqual(@as(usize, 4), file.location_rows.len);
        try std.testing.expectEqual(@as(usize, 1), file.location_rows[0].at.line);
        try std.testing.expectEqual(@as(usize, 4), file.location_rows[3].at.line);
        try std.testing.expectEqual(@as(usize, 2), source.search_row.?);
    }
}

test "stacked search and LSP results retain source tint navigation and dump ownership" {
    if (!pardes.syntax.enabled) return error.SkipZigTest;
    const first = "\tfoo + 界 + foo;";
    const second = "        return foo;";
    const source_text = "const Box = struct {\n    fn run() void {\n" ++ first ++ "\n        const neighbor = 42;\n" ++ second ++ "\n    }\n};\n";
    for ([_]panes.Output.Origin{ .search, .{ .query = .references } }) |origin| {
        for ([_]bool{ false, true }) |visible| {
            const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 160, .rows = 50 });
            defer p.deinit();
            try std.testing.expectEqual(.stacked, p.locations_config.layout);
            p.locations_config = .{ .context = 1, .tscontext = true, .tslocations = visible };
            p.presentation.enabled = false;
            const source = try p.setTestFile(source_text);
            p.gpa.free(source.file.?.path);
            source.file.?.path = try p.gpa.dupe(u8, "/stacked-界.zig");
            var input: std.Io.Writer.Allocating = .init(p.gpa);
            defer input.deinit();
            const first_col = std.mem.lastIndexOf(u8, first, "foo").?;
            const second_col = std.mem.lastIndexOf(u8, second, "foo").?;
            try pardes.lsp.sourceSpanRow(&input.writer, source.file.?.path, 2, first_col, 2, first_col + 3, first);
            try pardes.lsp.sourceSpanRow(&input.writer, source.file.?.path, 4, second_col, 4, second_col + 3, second);
            try panes.Output.fillResults(p, 0, "/", origin, "stacked", try p.gpa.dupe(u8, input.written()), 1);
            const id = source.search_pane.?;
            const pane = p.panes[id].?;
            const file = &pane.file.?;
            var matches: [2]usize = undefined;
            var count: usize = 0;
            var previews: usize = 0;
            var context_addresses: usize = 0;
            for (file.location_rows, 0..) |row, index| {
                const line = modal.lineSlice(file.content, index);
                switch (row.kind) {
                    .match => {
                        try std.testing.expectEqual(line.len, row.code_start);
                        try std.testing.expect(row.location_end > 0);
                        try std.testing.expect(!std.mem.containsAtLeast(u8, line, 1, "foo"));
                        matches[count] = index;
                        count += 1;
                    },
                    .preview => {
                        try std.testing.expect(index > 0);
                        try std.testing.expectEqual(.match, file.location_rows[index - 1].kind);
                        try std.testing.expectEqual(file.location_rows[index - 1].at, row.at);
                        try std.testing.expectEqualStrings(file.location_rows[index - 1].path, row.path);
                        try std.testing.expectEqual(@as(usize, 0), row.location_end);
                        try std.testing.expectEqual(@as(usize, 0), row.code_start);
                        try std.testing.expectEqualStrings(if (previews == 0) first else second, line);
                        previews += 1;
                    },
                    .context => {
                        if (row.location_end > 0) {
                            try std.testing.expect(visible and row.declaration);
                            try std.testing.expectEqual(line.len, row.code_start);
                            context_addresses += 1;
                        } else {
                            try std.testing.expectEqual(@as(usize, 0), row.code_start);
                            try std.testing.expectEqualStrings(modal.lineSlice(source_text, row.at.line - 1), line);
                        }
                    },
                }
            }
            try std.testing.expectEqual(@as(usize, 2), count);
            try std.testing.expectEqual(count, previews);
            try std.testing.expectEqual(@as(usize, if (visible) 2 else 0), context_addresses);
            try std.testing.expectEqual(matches[1], source.search_row.?);
            const original_content = try p.gpa.dupe(u8, file.content);
            defer p.gpa.free(original_content);
            try panes.Output.fillResults(p, 0, "/", origin, "stacked", try p.gpa.dupe(u8, input.written()), 0);
            try std.testing.expectEqual(id, source.search_pane.?);
            try std.testing.expectEqualStrings(original_content, file.content);
            pardes.layout.compute(p);
            var arena = std.heap.ArenaAllocator.init(p.gpa);
            defer arena.deinit();
            const surface = try p.render(arena.allocator());
            const chrome = pardes.ChromeTheme.fromTheme(p.theme());
            var marked: usize = 0;
            for (surface.cells) |cell| {
                if (!std.meta.eql(cell.style.bg, pardes.Color{ .rgb = chrome.search_bg })) continue;
                try std.testing.expect(cell.text[0] == 'f' or cell.text[0] == 'o');
                marked += 1;
            }
            try std.testing.expectEqual(@as(usize, 6), marked);
            const number = std.mem.indexOf(u8, file.content, "42").?;
            try std.testing.expectEqual(@intFromEnum(pardes.syntax.Syn.number), file.highlights[number]);
            p.active = id;
            pane.body.mode = .normal;
            pardes.look.armLookWalk(p, id);
            for ([_]struct { key: u21, match: usize }{ .{ .key = 'n', .match = 0 }, .{ .key = 'n', .match = 1 }, .{ .key = 'N', .match = 0 } }) |step| {
                p.update(.{ .key = .{ .cp = step.key } });
                try std.testing.expectEqual(@as(i32, @intCast(matches[step.match])), pane.body.cur_row);
                const row = file.location_rows[matches[step.match]];
                const line = modal.lineSlice(file.content, matches[step.match]);
                try std.testing.expectEqualStrings(line[0..row.location_end], selectedOutputText(pane) orelse "");
            }
            try pardes.dump.dumpState(p);
            const restored = try pardes.dump.initFromDump(p.gpa, .{ .tty_only = true }, p.dump_out.?);
            defer restored.deinit();
            const restored_file = &restored.panes[id].?.file.?;
            try std.testing.expectEqualStrings(file.content, restored_file.content);
            try std.testing.expectEqual(file.location_rows.len, restored_file.location_rows.len);
            for (file.location_rows, restored_file.location_rows) |before, after| {
                try std.testing.expectEqual(before.kind, after.kind);
                try std.testing.expectEqual(before.at, after.at);
                try std.testing.expectEqualStrings(before.path, after.path);
                try std.testing.expectEqual(before.code_start, after.code_start);
                try std.testing.expectEqual(before.location_end, after.location_end);
                try std.testing.expectEqualSlices(u8, before.colors, after.colors);
            }
            restored.active = id;
            pardes.look.armLookWalk(restored, id);
            // The dot came back on the match it was on; the walk goes on
            // from it both ways, N wrapping to the last as it does live.
            try std.testing.expectEqual(@as(i32, @intCast(matches[0])), restored.panes[id].?.body.cur_row);
            restored.update(.{ .key = .{ .cp = 'N' } });
            try std.testing.expectEqual(@as(i32, @intCast(matches[1])), restored.panes[id].?.body.cur_row);
            restored.update(.{ .key = .{ .cp = 'n' } });
            try std.testing.expectEqual(@as(i32, @intCast(matches[0])), restored.panes[id].?.body.cur_row);
            try std.testing.expectEqualStrings(source_text, source.file.?.content);
        }
    }
}

test "location analysis cache refreshes unsaved ancestry and query context" {
    if (!pardes.syntax.enabled) return error.SkipZigTest;
    const before = "const Outer = struct {\n" ++
        "    fn first() void {\n" ++
        "        marker();\n" ++
        "    }\n" ++
        "    fn second() void {\n" ++
        "        marker();\n" ++
        "    }\n" ++
        "};\n";
    const after = "pub fn revised() void {\n    // new neighbor\n        marker();\n}\n";
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    const source = try p.setTestFile(before);
    p.gpa.free(source.file.?.path);
    source.file.?.path = try p.gpa.dupe(u8, "/analysis-cache.zig");
    p.locations_config = .{ .context = 0, .tscontext = true, .tslocations = false };
    const Runner = struct {
        fn fill(editor: *Pardes, line: usize) !void {
            const path = editor.panes[0].?.file.?.path;
            const input = try std.fmt.allocPrint(editor.gpa, "{s}:{d}:9-14         marker();\n", .{ path, line });
            try panes.Output.fillResults(editor, 0, "/", .search, "marker", input, 0);
        }
    };
    try Runner.fill(p, 3);
    const id = source.search_pane.?;
    const file = &p.panes[id].?.file.?;
    try std.testing.expect(std.mem.indexOf(u8, file.content, "const Outer") != null);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "fn first") != null);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "fn second") == null);
    const original = file.content.ptr;
    const revision = file.revision;
    const analyses = p.locations_cache.analyses;
    const hits = p.locations_cache.hits;
    try Runner.fill(p, 3);
    try std.testing.expectEqual(id, source.search_pane.?);
    try std.testing.expectEqual(original, file.content.ptr);
    try std.testing.expectEqual(revision, file.revision);
    try std.testing.expectEqual(analyses, p.locations_cache.analyses);
    try std.testing.expect(p.locations_cache.hits > hits);

    // Reusing analysis must still choose the ancestry of the current match.
    try Runner.fill(p, 6);
    try std.testing.expectEqual(analyses, p.locations_cache.analyses);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "const Outer") != null);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "fn first") == null);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "fn second") != null);
    const match = file.location_rows[source.search_row.?];
    try std.testing.expectEqual(.match, match.kind);
    try std.testing.expectEqual(@as(usize, 6), match.at.line);

    // The path stays identical, but an unsaved replacement changes its tree.
    panes.File.setContent(p, &source.file.?, try p.gpa.dupe(u8, after));
    try Runner.fill(p, 3);
    try std.testing.expect(p.locations_cache.analyses > analyses);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "fn revised") != null);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "const Outer") == null);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "fn second") == null);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "new neighbor") == null);

    p.locations_config.context = 1;
    try Runner.fill(p, 3);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "fn revised") != null);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "new neighbor") != null);
    const expanded = try p.gpa.dupe(u8, file.content);
    defer p.gpa.free(expanded);
    const expanded_analyses = p.locations_cache.analyses;
    p.locations_config.context = 0;
    try Runner.fill(p, 3);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "new neighbor") == null);
    p.locations_config.context = 1;
    try Runner.fill(p, 3);
    try std.testing.expectEqualStrings(expanded, file.content);
    try std.testing.expectEqual(expanded_analyses, p.locations_cache.analyses);
    p.locations_config.tscontext = false;
    try Runner.fill(p, 3);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "fn revised") == null);
    try std.testing.expect(std.mem.indexOf(u8, file.content, "new neighbor") != null);
    try std.testing.expectEqualStrings(after, source.file.?.content);
}

test "location cache eviction retains early colors and honors disk and unsaved replacements" {
    if (!pardes.syntax.enabled) return error.SkipZigTest;
    var tmp = std.testing.tmpDir(.{});
    defer tmp.cleanup();
    var dir_buf: [4096]u8 = undefined;
    const dir = dir_buf[0..try tmp.dir.realPath(std.testing.io, &dir_buf)];
    const comment = "/* open\nconst int value = 42;\n*/\nneedle();\n";
    const code = "// open\nconst int value = 42;\n//\nneedle();\n";
    try std.testing.expectEqual(comment.len, code.len);
    const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true });
    defer p.deinit();
    const source = try p.setTestFile("notes\n");
    p.locations_config = .{ .context = 3, .tscontext = false };
    var input: std.Io.Writer.Allocating = .init(p.gpa);
    defer input.deinit();
    for (0..65) |index| {
        var name_buf: [32]u8 = undefined;
        const name = try std.fmt.bufPrint(&name_buf, "f{d:0>2}.c", .{index});
        try tmp.dir.writeFile(std.testing.io, .{ .sub_path = name, .data = if (index == 0) comment else code });
        try input.writer.print("{s}:4:1-6 needle();\n", .{name});
    }
    try panes.Output.fillResults(p, 0, dir, .search, "eviction", try p.gpa.dupe(u8, input.written()), null);
    const id = source.search_pane.?;
    const file = &p.panes[id].?.file.?;
    try std.testing.expectEqual(@as(usize, 64), p.locations_cache.len);
    try std.testing.expectEqual(@as(usize, 65), p.locations_cache.analyses);
    const Color = struct {
        fn valueColor(result: *const panes.File.State) !u8 {
            for (result.location_rows, 0..) |row, index| {
                if (row.kind != .context or row.at.line != 2 or !std.mem.endsWith(u8, row.path, "f00.c")) continue;
                const line = modal.lineSlice(result.content, index);
                const number = std.mem.indexOf(u8, line[row.code_start..], "42").?;
                try std.testing.expectEqualStrings("const int value = 42;", line[row.code_start..]);
                try std.testing.expectEqual(line.len - row.code_start, row.colors.len);
                return row.colors[number];
            }
            return error.MissingEarlyContext;
        }
    };
    try std.testing.expectEqual(@intFromEnum(pardes.syntax.Syn.comment), try Color.valueColor(file));
    const single = "f00.c:4:1-6 needle();\n";
    // Put the evicted file back before a same-size edit tests exact-byte keys.
    try panes.Output.fillResults(p, 0, dir, .search, "eviction", try p.gpa.dupe(u8, single), null);
    const analyses = p.locations_cache.analyses;
    try tmp.dir.writeFile(std.testing.io, .{ .sub_path = "f00.c", .data = code });
    try panes.Output.fillResults(p, 0, dir, .search, "eviction", try p.gpa.dupe(u8, single), null);
    try std.testing.expect(p.locations_cache.analyses > analyses);
    try std.testing.expectEqual(@intFromEnum(pardes.syntax.Syn.number), try Color.valueColor(file));

    // An open buffer has priority over that disk revision, even with equal size.
    p.gpa.free(source.file.?.path);
    source.file.?.path = try std.fs.path.join(p.gpa, &.{ dir, "f00.c" });
    panes.File.setContent(p, &source.file.?, try p.gpa.dupe(u8, comment));
    try panes.Output.fillResults(p, 0, dir, .search, "eviction", try p.gpa.dupe(u8, single), null);
    try std.testing.expectEqual(@intFromEnum(pardes.syntax.Syn.comment), try Color.valueColor(file));
    try std.testing.expectEqualStrings(comment, source.file.?.content);
}