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+/**
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+ * Doc-sync gate: enforce the bilingual pairing contract (docs/i18n/README.md).
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+ * English is canonical; the translation of `foo.md` is a sibling `foo.zh.md`
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+ * whose FIRST line fingerprints the English source it was translated from:
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+ *
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+ * <!-- i18n-source: docs/foo.md@<first 12 hex of git blob hash> -->
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+ *
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+ * The gate checks, mechanically, everything the contract promises:
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+ *
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+ * 1. Every English file in the manifest's `required` list has a `.zh.md`
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+ * sibling (the enforcement frontier — grows batch by batch).
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+ * 2. Every EXISTING `.zh.md`, required or not, is sound: its source exists
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+ * (no orphans), its fingerprint equals the source's current blob hash
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+ * (no stale translations), both sides carry the language-switcher link,
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+ * and its fenced-code-block and heading counts match the source.
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+ * 3. `excluded` files (generated docs, agent instructions, the bilingual
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+ * terminology table) have no `.zh.md` at all.
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+ *
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+ * The fingerprint is a git BLOB hash, not a commit hash, so a translation
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+ * updated in the same PR as its English source verifies without any history
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+ * lookup: staleness is a pure content comparison, computed here directly
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+ * (sha1 of `blob <size>\0<content>`) without spawning git.
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+ *
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+ * Run: `tsx scripts/verify-translation-pairing.ts` — or with `--list` to print
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+ * the translation state (missing/stale/ok) of every in-scope document as a
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+ * work list; `--list` always exits 0.
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+ */
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+
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+import { createHash } from 'node:crypto'
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+import { existsSync, readFileSync } from 'node:fs'
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+import { basename, join, resolve } from 'node:path'
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+import { glob } from 'node:fs/promises'
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+import { fromMarkdown } from 'mdast-util-from-markdown'
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+import { gfmFromMarkdown } from 'mdast-util-gfm'
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+import { gfm } from 'micromark-extension-gfm'
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+import type { Nodes } from 'mdast'
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+
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+const root = resolve(import.meta.dirname, '..')
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+const listMode = process.argv.includes('--list')
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+
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+/** Scope of the bilingual contract: the root README and the docs tree. */
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+const SCOPE_PATTERNS = ['README.md', 'README.zh.md', 'docs/**/*.md']
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+
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+/** The enforcement frontier and the never-paired set (docs/i18n/README.md § Scope). */
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+interface Manifest {
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+ required: string[]
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+ excluded: string[]
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+}
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+const manifest = JSON.parse(readFileSync(join(root, 'scripts/translation-pairing.manifest.json'), 'utf8')) as Manifest
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+
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+/** First line of a translation: fingerprint of the English source it renders. */
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+const FINGERPRINT = /^<!-- i18n-source: (?<path>\S+)@(?<hash>[0-9a-f]{12}) -->$/
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+
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+/** An excluded entry ending in `/` excludes the whole directory. */
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+function isExcluded(file: string): boolean {
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+ return manifest.excluded.some(entry => (entry.endsWith('/') ? file.startsWith(entry) : file === entry))
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+}
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+
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+/** Git blob hash (what `git hash-object` prints), truncated to 12 hex digits. */
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+function blobHash(content: Buffer): string {
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+ const hash = createHash('sha1')
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+ hash.update(`blob ${content.byteLength}\0`)
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+ hash.update(content)
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+ return hash.digest('hex').slice(0, 12)
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+}
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+
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+/** Counts that must match between a source and its translation. */
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+interface Shape {
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+ codeBlocks: number
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+ headings: number
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+}
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+
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+/** Whether `text` contains a relative markdown link to exactly `target`. */
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+function linksTo(tree: Nodes, target: string): boolean {
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+ let found = false
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+ const visit = (node: Nodes): void => {
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+ if (node.type === 'link' && node.url === target) found = true
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+ if ('children' in node) for (const child of node.children) visit(child)
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+ }
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+ visit(tree)
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+ return found
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+}
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+
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+function shapeOf(tree: Nodes): Shape {
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+ let codeBlocks = 0
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+ let headings = 0
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+ const visit = (node: Nodes): void => {
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+ if (node.type === 'code') codeBlocks++
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+ if (node.type === 'heading') headings++
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+ if ('children' in node) for (const child of node.children) visit(child)
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+ }
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+ visit(tree)
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+ return { codeBlocks, headings }
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+}
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+
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+function parse(content: string): Nodes {
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+ return fromMarkdown(content, { extensions: [gfm()], mdastExtensions: [gfmFromMarkdown()] })
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+}
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+
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+// Enumerate the scope once, split into sources and translations.
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+const files = new Set<string>()
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+for (const pattern of SCOPE_PATTERNS) {
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+ for await (const match of glob(pattern, { cwd: root })) files.add(match)
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+}
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+const translations = [...files].filter(f => f.endsWith('.zh.md')).sort()
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+const sources = [...files].filter(f => !f.endsWith('.zh.md')).sort()
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+
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+const errors: string[] = []
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+const state = new Map<string, 'ok' | 'stale' | 'missing'>()
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+
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+// 1. Required pairs exist.
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+for (const req of manifest.required) {
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+ if (!existsSync(join(root, req))) {
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+ errors.push(`${req}: listed in translation-pairing.manifest.json \`required\` but the file does not exist`)
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+ continue
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+ }
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+ const zh = req.replace(/\.md$/, '.zh.md')
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+ if (!existsSync(join(root, zh))) {
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+ errors.push(`${req}: required to have a translation, but ${zh} does not exist`)
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+ state.set(req, 'missing')
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+ }
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+}
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+
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+// 2. Every existing translation is sound.
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+for (const zh of translations) {
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+ const source = zh.replace(/\.zh\.md$/, '.md')
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+ const sourceAbs = join(root, source)
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+ if (!existsSync(sourceAbs)) {
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+ errors.push(`${zh}: orphan — its English source ${source} does not exist (delete or rename the translation alongside its source)`)
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+ continue
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+ }
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+ if (isExcluded(source)) {
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+ errors.push(`${zh}: ${source} is excluded from pairing (generated or bilingual-by-construction); this translation must not exist`)
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+ continue
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+ }
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+
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+ const zhContent = readFileSync(join(root, zh), 'utf8')
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+ const firstLine = zhContent.slice(0, zhContent.indexOf('\n'))
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+ const match = FINGERPRINT.exec(firstLine)
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+ if (!match?.groups) {
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+ errors.push(`${zh}: first line is not an i18n-source fingerprint (expected \`<!-- i18n-source: ${source}@<12-hex> -->\`, got \`${firstLine.slice(0, 60)}\`)`)
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+ continue
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+ }
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+ if (match.groups['path'] !== source) {
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+ errors.push(`${zh}: fingerprint names ${match.groups['path']} but the sibling source is ${source}`)
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+ continue
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+ }
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+
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+ const sourceContent = readFileSync(sourceAbs)
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+ const current = blobHash(sourceContent)
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+ if (match.groups['hash'] !== current) {
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+ errors.push(`${zh}: stale — fingerprint ${match.groups['hash']} but ${source} is now ${current} (update the translation, then re-fingerprint)`)
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+ state.set(source, 'stale')
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+ continue
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+ }
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+
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+ const zhTree = parse(zhContent)
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+ const sourceTree = parse(sourceContent.toString('utf8'))
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+ if (!linksTo(zhTree, basename(source))) {
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+ errors.push(`${zh}: missing language switcher — no link to ${basename(source)}`)
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+ }
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+ if (!linksTo(sourceTree, basename(zh))) {
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+ errors.push(`${source}: missing language switcher — no link back to ${basename(zh)}`)
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+ }
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+ const zhShape = shapeOf(zhTree)
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+ const sourceShape = shapeOf(sourceTree)
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+ if (zhShape.codeBlocks !== sourceShape.codeBlocks) {
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+ errors.push(`${zh}: ${zhShape.codeBlocks} fenced code block(s) vs ${sourceShape.codeBlocks} in ${source} — code blocks must mirror the source`)
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+ }
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+ if (zhShape.headings !== sourceShape.headings) {
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+ errors.push(`${zh}: ${zhShape.headings} heading(s) vs ${sourceShape.headings} in ${source} — heading structure must mirror the source`)
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+ }
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+ if (!state.has(source)) state.set(source, 'ok')
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+}
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+
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+// Complete the state map for --list: any in-scope, non-excluded source with no translation yet is backlog.
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+for (const source of sources) {
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+ if (!isExcluded(source) && !state.has(source)) state.set(source, 'missing')
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+}
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+
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+if (listMode) {
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+ const order = { stale: 0, missing: 1, ok: 2 } as const
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+ const rows = [...state.entries()].sort((a, b) => order[a[1]] - order[b[1]] || a[0].localeCompare(b[0]))
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+ for (const [file, status] of rows) {
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+ const required = manifest.required.includes(file)
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+ console.log(`${status.padEnd(7)} ${file}${status === 'missing' ? (required ? ' (required)' : ' (backlog)') : ''}`)
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+ }
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+ const counts = { ok: 0, stale: 0, missing: 0 }
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+ for (const status of state.values()) counts[status]++
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+ console.log(`verify-translation-pairing: ${counts.ok} ok, ${counts.stale} stale, ${counts.missing} missing (of ${state.size} in scope)`)
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+ process.exit(0)
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+}
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+
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+if (errors.length === 0) {
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+ console.log(`verify-translation-pairing: ${translations.length} translation(s) checked against ${manifest.required.length} required pair(s), all sound.`)
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+ process.exit(0)
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+}
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+
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+console.error('verify-translation-pairing: bilingual pairing contract violated (see docs/i18n/README.md):')
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+for (const message of errors) console.error(` ${message}`)
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+process.exit(1)
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