import { test } from 'node:test'
import assert from 'node:assert/strict'
import path from 'node:path'
import os from 'node:os'
import { promises as fs } from 'node:fs'
import { execFile } from 'node:child_process'
import { promisify } from 'node:util'
import { CacheManager } from '../../src/cache/index.js'
import { determineNextState } from '../../src/state-machine/index.js'

const execFileAsync = promisify(execFile)

// 造 git 书仓库 + 缓存。files = {相对路径: 内容}；committed=true 时初始全部提交
async function makeGitBook(files, { commit = true } = {}) {
  const root = await fs.mkdtemp(path.join(os.tmpdir(), 'wnw-sm-'))
  const git = (a) => execFileAsync('git', a, { cwd: root })
  await git(['init', '-q'])
  await git(['config', 'user.email', 't@example.com'])
  await git(['config', 'user.name', 'test'])
  await fs.writeFile(path.join(root, '.gitignore'), '.cache/\n工作区/\n', 'utf8')
  for (const [rel, content] of Object.entries(files)) {
    const full = path.join(root, rel)
    await fs.mkdir(path.dirname(full), { recursive: true })
    await fs.writeFile(full, content, 'utf8')
  }
  if (commit) {
    await git(['add', '-A'])
    await git(['commit', '-q', '-m', 'init'])
  }
  const dbDir = await fs.mkdtemp(path.join(os.tmpdir(), 'wnw-sm-db-'))
  const cache = new CacheManager(path.join(dbDir, 'index.db'))
  await cache.ensureReady(root)
  return {
    root,
    git,
    ctx: { repoPath: root, cache },
    cleanup: async () => {
      await cache.close()
      await fs.rm(root, { recursive: true, force: true })
      await fs.rm(dbDir, { recursive: true, force: true })
    },
  }
}

const ch = (n, vol = 1, pos = '推进') =>
  `---\n章号: ${n}\n标题: 第${n}章\n卷: ${vol}\n字数: 100\n章定位: ${pos}\n钩子: 危机钩-强\n情绪定位: 铺垫\n---\n正文。`

const healthyBook = (extra = {}) => ({
  'book.yaml': 'spec_version: "7.0"\n书名: 测\n卷规模: 40\n体检周期: 50\n',
  '大纲/总纲.md': '# 总纲\n## 结局\nx',
  '定稿/正文/0001-第1章.md': ch(1),
  ...extra,
})

test('序1：无 book.yaml → 建书引导', async () => {
  const { ctx, cleanup } = await makeGitBook({ '大纲/占位.md': 'x' })
  try {
    const r = await determineNextState(ctx)
    assert.equal(r.序, 1)
    assert.equal(r.state, 'create-book')
  } finally {
    await cleanup()
  }
})

test('序6：健康书、无异常 → 起草新章细纲', async () => {
  const { ctx, cleanup } = await makeGitBook(healthyBook())
  try {
    const r = await determineNextState(ctx)
    assert.equal(r.序, 6, `实际：${JSON.stringify(r)}`)
    assert.equal(r.state, 'draft-outline')
  } finally {
    await cleanup()
  }
})

test('序0：源文件解析失败 → 修复确认', async () => {
  const { ctx, cleanup } = await makeGitBook(
    healthyBook({ '定稿/正文/0002-坏章.md': '---\n章号: 2\n标题: [未闭合\n卷: : :\n---\n正文' })
  )
  try {
    const r = await determineNextState(ctx)
    assert.equal(r.序, 0)
    assert.equal(r.state, 'repair-confirm')
  } finally {
    await cleanup()
  }
})

test('序2：定稿有未登记手改 → 提议补登', async () => {
  const { ctx, root, cleanup } = await makeGitBook(healthyBook())
  try {
    // 提交后手改一个已跟踪文件（不提交）
    await fs.writeFile(path.join(root, '定稿/正文/0001-第1章.md'), ch(1) + '\n手改了一句。', 'utf8')
    const r = await determineNextState(ctx)
    assert.equal(r.序, 2)
    assert.equal(r.state, 'relink-manual-edits')
  } finally {
    await cleanup()
  }
})

test('序3：工作区有未完成草稿 → 断点续跑', async () => {
  const { ctx, root, cleanup } = await makeGitBook(healthyBook())
  try {
    await fs.mkdir(path.join(root, '工作区'), { recursive: true })
    await fs.writeFile(path.join(root, '工作区/草稿-A.md'), '半成品草稿', 'utf8')
    const r = await determineNextState(ctx)
    assert.equal(r.序, 3)
    assert.equal(r.state, 'resume')
  } finally {
    await cleanup()
  }
})

test('序4：卷末章 → 卷复盘', async () => {
  const { ctx, cleanup } = await makeGitBook({
    'book.yaml': 'spec_version: "7.0"\n书名: 测\n卷规模: 2\n体检周期: 50\n',
    '大纲/总纲.md': '# 总纲',
    '定稿/正文/0001-第1章.md': ch(1),
    '定稿/正文/0002-第2章.md': ch(2),
  })
  try {
    const r = await determineNextState(ctx)
    assert.equal(r.序, 4, `实际：${JSON.stringify(r)}`)
    assert.equal(r.state, 'volume-review')
  } finally {
    await cleanup()
  }
})

test('序5：到体检周期 → 体检', async () => {
  const { ctx, cleanup } = await makeGitBook({
    'book.yaml': 'spec_version: "7.0"\n书名: 测\n卷规模: 3\n体检周期: 2\n',
    '大纲/总纲.md': '# 总纲',
    '定稿/正文/0001-第1章.md': ch(1),
    '定稿/正文/0002-第2章.md': ch(2),
  })
  try {
    const r = await determineNextState(ctx)
    assert.equal(r.序, 5, `实际：${JSON.stringify(r)}`)
    assert.equal(r.state, 'health-check')
  } finally {
    await cleanup()
  }
})

test('命中即停：手改(序2) + 工作区草稿(序3) 同时存在 → 先报序2', async () => {
  const { ctx, root, cleanup } = await makeGitBook(healthyBook())
  try {
    await fs.writeFile(path.join(root, '定稿/正文/0001-第1章.md'), ch(1) + '\n手改。', 'utf8')
    await fs.mkdir(path.join(root, '工作区'), { recursive: true })
    await fs.writeFile(path.join(root, '工作区/草稿-A.md'), '草稿', 'utf8')
    const r = await determineNextState(ctx)
    assert.equal(r.序, 2)
  } finally {
    await cleanup()
  }
})