#!/usr/bin/env node
// Refresh docs/LIBS.md from the live crema-manifest. Reads this project's
// tsconfig.json + app.css to figure out which libs/themes are "wired in",
// clones the manifest, and emits a markdown table for each (wired vs
// available). Run after `crema add <lib>`, or whenever you want a fresh
// catalog snapshot for the development LLM to consult.
//
// Usage:  npm run sync-libs
//
// The output is intentionally compact — terse one-line descriptions, alpha
// sort, no front-matter. CLAUDE.md points at LIBS.md so the LLM finds it.

import { execSync } from "node:child_process"
import { mkdtempSync, readFileSync, writeFileSync } from "node:fs"
import { tmpdir } from "node:os"
import { join, resolve, dirname } from "node:path"
import { fileURLToPath } from "node:url"

const ROOT = resolve(dirname(fileURLToPath(import.meta.url)), "..")
const MANIFEST_REPO = "https://git.sky-ai.com/CremaUIStudio/crema-manifest.git"

function readJson(path) {
  return JSON.parse(readFileSync(path, "utf8"))
}

function readJsonc(path) {
  // tsconfig.json sometimes has // and /* */ comments. Strip them, but only
  // outside strings (so https:// URLs inside string values survive).
  const raw = readFileSync(path, "utf8")
  let out = ""
  let i = 0
  let inString = false
  while (i < raw.length) {
    const c = raw[i]
    const c2 = raw[i + 1]
    if (inString) {
      out += c
      if (c === "\\" && i + 1 < raw.length) {
        out += raw[i + 1]
        i += 2
        continue
      }
      if (c === '"') inString = false
      i++
      continue
    }
    if (c === '"') {
      inString = true
      out += c
      i++
      continue
    }
    if (c === "/" && c2 === "/") {
      while (i < raw.length && raw[i] !== "\n") i++
      continue
    }
    if (c === "/" && c2 === "*") {
      i += 2
      while (i < raw.length - 1 && !(raw[i] === "*" && raw[i + 1] === "/")) i++
      i += 2
      continue
    }
    out += c
    i++
  }
  return JSON.parse(out)
}

function cloneManifest() {
  const dir = mkdtempSync(join(tmpdir(), "crema-manifest-"))
  execSync(`git clone --depth 1 --quiet ${MANIFEST_REPO} ${dir}`, {
    stdio: "ignore",
  })
  return readJson(join(dir, "manifest.json"))
}

function detectWiredLibs(tsconfigPath) {
  const ts = readJsonc(tsconfigPath)
  const paths = ts?.compilerOptions?.paths ?? {}
  const wired = new Set()
  for (const key of Object.keys(paths)) {
    const m = /^@crema\/([a-z0-9-]+)$/.exec(key)
    if (m) wired.add(m[1])
  }
  return [...wired].sort()
}

function detectWiredThemes(cssPath) {
  const css = readFileSync(cssPath, "utf8")
  const re = /@import\s+["']\.\.\/\.\.\/lib-theme-([a-z0-9-]+)\/theme\.css["']/g
  const wired = new Set()
  let m
  while ((m = re.exec(css)) !== null) wired.add(m[1])
  return [...wired].sort()
}

function row(entry) {
  const desc = (entry.description ?? "").replace(/\s+/g, " ").trim()
  const oneline = desc.length > 140 ? desc.slice(0, 137) + "…" : desc
  return `| \`${entry.name}\` | \`${entry.alias ?? `@crema/${entry.name}`}\` | ${oneline} |`
}

function themeRow(entry) {
  const desc = (entry.description ?? "").replace(/\s+/g, " ").trim()
  const oneline = desc.length > 160 ? desc.slice(0, 157) + "…" : desc
  return `| \`${entry.name}\` | ${entry.darkMode ?? "—"} | ${oneline} |`
}

function buildMarkdown(manifest, wiredLibs, wiredThemes) {
  const libs = [...(manifest.libs ?? [])].sort((a, b) =>
    a.name.localeCompare(b.name),
  )
  const themes = [...(manifest.themes ?? [])].sort((a, b) =>
    a.name.localeCompare(b.name),
  )

  const wiredSet = new Set(wiredLibs)
  const wiredThemeSet = new Set(wiredThemes)

  const wiredLibEntries = libs.filter((l) => wiredSet.has(l.name))
  const availableLibEntries = libs.filter((l) => !wiredSet.has(l.name))
  const wiredThemeEntries = themes.filter((t) => wiredThemeSet.has(t.name))
  const availableThemeEntries = themes.filter((t) => !wiredThemeSet.has(t.name))

  const wiredOnlyNotInManifest = wiredLibs.filter(
    (n) => !libs.some((l) => l.name === n),
  )

  const lines = []
  lines.push(
    `# Available Crema libs`,
    ``,
    `> Generated by \`scripts/sync-libs.mjs\` from crema-manifest@${manifest.version}.`,
    `> Run \`npm run sync-libs\` to refresh.`,
    ``,
    `Every \`@crema/*-ui\` lib is its own git repo at`,
    `\`https://git.sky-ai.com/CremaUIStudio/lib-<name>-ui\`. To add one, clone it`,
    `as a sibling of this project, then add the tsconfig path entry and the`,
    `\`@source\` line to \`app/app.css\` (the marker comments make this easy).`,
    ``,
    `## Wired in this project (${wiredLibEntries.length})`,
    ``,
    `These are importable from your code right now (\`import { … } from "@crema/<name>"\`):`,
    ``,
    `| Lib | Alias | Purpose |`,
    `|---|---|---|`,
    ...wiredLibEntries.map(row),
    ``,
  )

  if (wiredOnlyNotInManifest.length) {
    lines.push(
      `> ⚠ Wired in tsconfig but not in the manifest catalog: ${wiredOnlyNotInManifest.map((n) => `\`${n}\``).join(", ")}. Probably an internal or experimental lib.`,
      ``,
    )
  }

  lines.push(
    `## Active theme${wiredThemeEntries.length === 1 ? "" : "s"}`,
    ``,
    `| Theme | Dark mode | Purpose |`,
    `|---|---|---|`,
    ...(wiredThemeEntries.length
      ? wiredThemeEntries.map(themeRow)
      : ["| (none detected) | — | — |"]),
    ``,
    `## Available to add (${availableLibEntries.length})`,
    ``,
    `From the manifest. To wire one in: \`crema add <name>\` (CLI), or`,
    `manually clone the repo + edit \`tsconfig.json\` paths + \`app/app.css\``,
    `\`@source\`.`,
    ``,
    `| Lib | Alias | Purpose |`,
    `|---|---|---|`,
    ...availableLibEntries.map(row),
    ``,
  )

  if (availableThemeEntries.length) {
    lines.push(
      `## Other themes (${availableThemeEntries.length})`,
      ``,
      `Swap by changing the \`@import "../../lib-theme-<name>/theme.css"\` line at the top of \`app/app.css\`.`,
      ``,
      `| Theme | Dark mode | Purpose |`,
      `|---|---|---|`,
      ...availableThemeEntries.map(themeRow),
      ``,
    )
  }

  return lines.join("\n")
}

function main() {
  console.log("→ cloning manifest…")
  const manifest = cloneManifest()
  console.log(`  manifest@${manifest.version} (${(manifest.libs ?? []).length} libs, ${(manifest.themes ?? []).length} themes)`)

  const wiredLibs = detectWiredLibs(join(ROOT, "tsconfig.json"))
  console.log(`→ wired libs: ${wiredLibs.length} (${wiredLibs.join(", ") || "(none)"})`)

  const wiredThemes = detectWiredThemes(join(ROOT, "app", "app.css"))
  console.log(`→ wired themes: ${wiredThemes.length} (${wiredThemes.join(", ") || "(none)"})`)

  const md = buildMarkdown(manifest, wiredLibs, wiredThemes)
  const outPath = join(ROOT, "docs", "LIBS.md")
  writeFileSync(outPath, md + "\n")
  console.log(`→ wrote ${outPath} (${md.length} chars)`)
}

main()