import { execFileSync } from 'node:child_process'
import { mkdir, readFile, writeFile } from 'node:fs/promises'
import { dirname, resolve } from 'node:path'
import { pathToFileURL } from 'node:url'

const ALLOWED_STATUSES = new Set(['code_complete', 'testing', 'done'])
const CONFIG_PATH = resolve('.private/kaifa-progress-sync/.env.local')

export function parseArgs(argv) {
  const args = new Map()
  for (let index = 0; index < argv.length; index += 1) {
    const token = argv[index]
    if (!token.startsWith('--')) continue
    if (token === '--apply' || token === '--resolve' || token === '--help') args.set(token.slice(2), true)
    else args.set(token.slice(2), argv[++index])
  }
  return args
}

export function validateOptions(options) {
  for (const name of ['module', 'feature', 'status', 'summary']) {
    if (!options.get(name)) throw new Error(`缺少 --${name}`)
  }
  if (!ALLOWED_STATUSES.has(options.get('status'))) throw new Error('status 只能是 code_complete、testing 或 done')
  if (options.get('status') === 'done' && options.get('test-status') !== 'passed') throw new Error('done 必须提供 --test-status passed')
  if (options.get('status') === 'done' && !options.get('completion-evidence')) throw new Error('done 必须提供 --completion-evidence')
}

// 平台要求每次推送携带与线上目录逐项一致的完整功能清单（inventory_check）。
// 文件由全量盘点脚本按 progress-sync GET 回读的最终状态生成，禁止手改占位。
export async function readInventoryCheck(options) {
  const path = options.get('inventory')
  if (!path) return undefined
  const parsed = JSON.parse(await readFile(resolve(path), 'utf8'))
  if (!Array.isArray(parsed) || parsed.length === 0) throw new Error('--inventory 文件必须是包含全部功能的非空数组')
  for (const item of parsed) {
    for (const field of ['module_id', 'module_name', 'feature_id', 'feature_name', 'feature_description', 'status', 'progress_percent']) {
      if (item[field] === undefined) throw new Error(`--inventory 条目缺少字段 ${field}`)
    }
  }
  return parsed
}

export function buildIdempotencyKey(sha, status) {
  return `gongxiangp2-${sha}-${status}`
}

function git(...args) {
  return execFileSync('git', args, { encoding: 'utf8', maxBuffer: 16 * 1024 * 1024 })
}

async function readConfig() {
  const text = await readFile(CONFIG_PATH, 'utf8')
  const config = Object.fromEntries(text.split(/\r?\n/).map((line) => line.match(/^([^#=]+)=(.*)$/)).filter(Boolean).map((match) => [match[1], match[2]]))
  for (const name of ['API_BASE', 'API_KEY', 'DEVELOPER', 'DEPARTMENT', 'PROJECT', 'PROJECT_ID']) {
    if (!config[name]) throw new Error(`本地配置缺少 ${name}`)
  }
  return config
}

async function api(config, path, init = {}) {
  const response = await fetch(`${config.API_BASE}${path}`, {
    ...init,
    headers: { Authorization: `Bearer ${config.API_KEY}`, ...(init.headers || {}) },
  })
  const body = await response.json().catch(() => ({}))
  if (!response.ok) throw new Error(`API ${response.status}: ${body.error?.message || body.error || body.message || '请求失败'}`)
  return body
}

function collectProjectMatches(value, projectId, matches = []) {
  if (!value || typeof value !== 'object') return matches
  if (String(value.projectId || value.id || '') === projectId) matches.push(value)
  for (const child of Array.isArray(value) ? value : Object.values(value)) collectProjectMatches(child, projectId, matches)
  return matches
}

function findFeature(project, moduleName, featureName) {
  const module = (project.modules || []).find((item) => (item.moduleName || item.name) === moduleName)
  const feature = (module?.features || []).find((item) => (item.featureName || item.name) === featureName)
  return module && feature ? {
    moduleId: module.moduleId || module.id,
    featureId: feature.featureId || feature.id,
  } : null
}

async function resolveTarget(config, options) {
  const catalog = await api(config, '/my/catalog')
  let project = collectProjectMatches(catalog, config.PROJECT_ID)[0]
  if (!project) throw new Error('目录中找不到当前项目')
  let target = findFeature(project, options.get('module'), options.get('feature'))
  if (target) return target
  if (!options.get('resolve')) throw new Error('模块或子功能不存在；确认精确名称后使用 --resolve')
  const result = await api(config, `/projects/${config.PROJECT_ID}/features/resolve`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      context: { department: config.DEPARTMENT, project: config.PROJECT, developer: config.DEVELOPER },
      items: [{ module_name: options.get('module'), feature_name: options.get('feature'), create_module: true }],
    }),
  })
  const item = result.items?.[0]
  if (!item?.canPush) throw new Error('新目录未返回可推送权限')
  return { moduleId: item.moduleId, featureId: item.featureId }
}

function readCommit(revision, target, config) {
  if (!/^(?:HEAD|[0-9a-f]{7,40})$/i.test(revision)) throw new Error('sha 只能是 HEAD 或 7-40 位十六进制提交号')
  const [sha, message, authorName, authorEmail, committedAt] = git('show', '-s', '--format=%H%x00%s%x00%aN%x00%aE%x00%cI', revision).trim().split('\0')
  if (authorEmail.toLowerCase() !== config.DEVELOPER.toLowerCase()) throw new Error(`提交作者 ${authorEmail} 不属于当前同步开发者`)
  const numstat = new Map()
  for (const line of git('diff-tree', '--root', '--no-commit-id', '--numstat', '-r', '--no-renames', sha).trim().split(/\r?\n/).filter(Boolean)) {
    const [added, deleted, ...pathParts] = line.split('\t')
    numstat.set(pathParts.join('\t'), { additions: added === '-' ? 0 : Number(added), deletions: deleted === '-' ? 0 : Number(deleted) })
  }
  const changedFiles = git('diff-tree', '--root', '--no-commit-id', '--name-status', '-r', '--no-renames', sha).trim().split(/\r?\n/).filter(Boolean).map((line) => {
    const [status, ...pathParts] = line.split('\t')
    const path = pathParts.join('\t')
    return { path, status: status[0], ...(numstat.get(path) || { additions: 0, deletions: 0 }) }
  })
  const stats = changedFiles.reduce((total, file) => ({ additions: total.additions + file.additions, deletions: total.deletions + file.deletions, files_changed: total.files_changed + 1 }), { additions: 0, deletions: 0, files_changed: 0 })
  return { sha, message, author_name: authorName, author_email: authorEmail, committed_at: committedAt, branch: git('branch', '--show-current').trim(), module_id: target.moduleId, feature_id: target.featureId, changed_files: changedFiles, stats }
}

export async function main(argv = process.argv.slice(2)) {
  const options = parseArgs(argv)
  if (options.get('help')) {
    console.log('用法: npm run progress:sync -- --module <模块> --feature <子功能> --status <code_complete|testing|done> --summary <摘要> [--test-status passed] [--completion-evidence <证据>] [--technical-summary <实现说明>] [--next-steps <下一步>] [--inventory <清单文件>] [--resolve] [--apply]')
    return
  }
  validateOptions(options)
  const config = await readConfig()
  const target = await resolveTarget(config, options)
  const commit = readCommit(options.get('sha') || 'HEAD', target, config)
  const update = {
    module_id: target.moduleId,
    feature_id: target.featureId,
    change_type: options.get('change-type') || 'technical',
    status: options.get('status'),
    summary: options.get('summary'),
    blockers: options.get('blockers') || null,
    evidence_shas: [commit.sha],
    ...(options.get('technical-summary') ? { technical_summary: options.get('technical-summary') } : {}),
    ...(options.get('test-status') ? { test_status: options.get('test-status') } : {}),
    ...(options.get('completion-evidence') ? { completion_evidence: options.get('completion-evidence') } : {}),
    ...(options.get('next-steps') ? { next_steps: options.get('next-steps') } : {}),
  }
  const payload = { context: { department: config.DEPARTMENT, project: config.PROJECT, developer: config.DEVELOPER }, commits: [commit], updates: [update] }
  const inventoryCheck = await readInventoryCheck(options)
  if (inventoryCheck) payload.inventory_check = inventoryCheck
  if (!options.get('apply')) {
    console.log(JSON.stringify({ dryRun: true, sha: commit.sha, author: `${commit.author_name} <${commit.author_email}>`, module: options.get('module'), feature: options.get('feature'), status: options.get('status'), stats: commit.stats }, null, 2))
    return
  }
  const result = await api(config, `/projects/${config.PROJECT_ID}/progress-sync`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', 'Idempotency-Key': buildIdempotencyKey(commit.sha, options.get('status')) },
    body: JSON.stringify(payload),
  })
  const receiptPath = resolve('.private/kaifa-progress-sync/latest-response.json')
  await mkdir(dirname(receiptPath), { recursive: true })
  await writeFile(receiptPath, `${JSON.stringify(result, null, 2)}\n`)
  console.log(JSON.stringify({ ok: true, sha: commit.sha, status: options.get('status'), module: options.get('module'), feature: options.get('feature') }, null, 2))
}

if (process.argv[1] && import.meta.url === pathToFileURL(resolve(process.argv[1])).href) {
  main().catch((error) => { console.error(error instanceof Error ? error.message : error); process.exitCode = 1 })
}