// jj-log.typ — Typst document that renders jj log JSON output
//
// Usage:
//   jj log -r '::@' --no-graph \
//     -T '{"commit": ' ++ json(self) ++ ', "bookmarks": ' ++ json(local_bookmarks) ++ ', "empty": ' ++ if(empty, "true", "false") ++ ', "conflict": ' ++ if(conflict, "true", "false") ++ ', "root": ' ++ if(root, "true", "false") ++ '}\n' \
//     > log.json
//   typst compile jj-log.typ --input data=log.json

#let data-path = sys.inputs.at("data", default: "log.json")
#let raw-text = read(data-path)
#let lines = raw-text.split("\n").filter(l => l.trim() != "")
#let commits = lines.map(l => json(bytes(l)))

// Filter out root commit
#let commits = commits.filter(c => not c.root)

// --- Helpers ---

#let mono(body) = text(font: "DejaVu Sans Mono", size: 0.85em, body)
#let short(hash) = hash.slice(0, 8)
#let tag-pill(name, color: rgb("#4a6fa5")) = {
  box(
    fill: color.lighten(75%),
    stroke: 0.5pt + color,
    radius: 3pt,
    inset: (x: 4pt, y: 2pt),
    text(size: 0.8em, font: "DejaVu Sans Mono", fill: color, weight: "bold", name),
  )
}

#let format-date(ts) = {
  // timestamp is ISO 8601, e.g. "2026-03-27T14:22:35-03:00"
  // extract date + time portion
  let date-part = ts.slice(0, 10)
  let time-part = ts.slice(11, 16)
  date-part + " " + time-part
}

// Collect all bookmarks across commits
#let all-bookmarks = commits.map(c => {
  c.bookmarks.map(b => (name: b.name, commit: short(c.commit.commit_id), change: short(c.commit.change_id), desc: c.commit.description.trim()))
}).flatten()

// --- Page setup ---

#set page(paper: "a4", margin: 2cm)
#set text(font: "DejaVu Sans", size: 10pt)
#set par(leading: 0.6em)

// --- Title ---

#align(center)[
  #text(size: 18pt, weight: "bold")[jj ancestor log]
  #v(0.3em)
  #text(size: 9pt, fill: gray)[
    #commits.len() commits #h(1em)
    #all-bookmarks.len() bookmarks #h(1em)
    newest → oldest
  ]
]

#v(1em)

// --- Bookmarks index ---

#if all-bookmarks.len() > 0 [
  == Bookmarks

  #for bm in all-bookmarks [
    - #tag-pill(bm.name) #h(0.5em) at #mono(bm.commit) — #emph(bm.desc)
  ]

  #v(1em)
]

// --- Commit log table ---

== Commit History

#table(
  columns: (auto, auto, 1fr, auto),
  align: (center, center, left, right),
  stroke: 0.4pt + luma(200),
  inset: 6pt,

  // Header
  table.header(
    text(weight: "bold")[Change],
    text(weight: "bold")[Commit],
    text(weight: "bold")[Description],
    text(weight: "bold")[Date],
  ),

  // Rows — newest to oldest (jj log default order with ::@)
  ..commits.map(c => {
    let bookmarks = c.bookmarks.map(b => tag-pill(b.name))
    let is-empty = c.empty
    let has-conflict = c.conflict
    let desc = c.commit.description.trim()
    if desc == "" { desc = "(no description)" }

    let badges = {
      if is-empty { tag-pill("empty", color: rgb("#999")) }
      if has-conflict { tag-pill("conflict", color: rgb("#c44")) }
    }

    (
      mono(short(c.commit.change_id)),
      mono(short(c.commit.commit_id)),
      [
        #desc
        #if bookmarks.len() > 0 { h(0.5em); bookmarks.join(h(0.3em)) }
        #badges
      ],
      text(size: 0.85em, fill: luma(100), format-date(c.commit.author.timestamp)),
    )
  }).flatten(),
)

// --- Detailed list ---

#v(1.5em)

== Commit Details

#for (i, c) in commits.enumerate() [
  #let desc = c.commit.description.trim()
  #if desc == "" { desc = "(no description)" }
  #let bookmarks = c.bookmarks.map(b => tag-pill(b.name))

  #block(
    width: 100%,
    inset: 8pt,
    radius: 4pt,
    stroke: 0.3pt + luma(200),
    fill: if calc.even(i) { luma(252) } else { white },
  )[
    #grid(
      columns: (auto, 1fr),
      column-gutter: 1em,
      row-gutter: 0.4em,
      text(fill: luma(120), size: 0.85em)[change:], mono(short(c.commit.change_id)),
      text(fill: luma(120), size: 0.85em)[commit:], mono(short(c.commit.commit_id)),
      text(fill: luma(120), size: 0.85em)[author:], [#c.commit.author.name #text(fill: luma(120))[\<#c.commit.author.email\>]],
      text(fill: luma(120), size: 0.85em)[date:], format-date(c.commit.author.timestamp),
      ..if bookmarks.len() > 0 {(
        text(fill: luma(120), size: 0.85em)[bookmarks:],
        bookmarks.join(h(0.3em)),
      )},
    )
    #v(0.3em)
    #text(weight: "bold", size: 1.05em, desc)
    #if c.empty [ #text(fill: luma(150), size: 0.85em)[\[empty\]] ]
    #if c.conflict [ #text(fill: rgb("#c44"), size: 0.85em)[\[conflict\]] ]
  ]

  #v(0.5em)
]