#!/usr/bin/env node

/**
 * 批量视频生产编排器
 *
 * 职责：读 Excel/CSV → 创建 batch-manifest → 管理 batch 状态
 * 不负责：分镜、生图、生视频（由 AI Worker 子 Agent 承担）
 *
 * 用法:
 *   node batch-pipeline.js init --file <xlsx/csv> [--account <账号>] [--mode <模式>]
 *   node batch-pipeline.js status --file <batch-manifest.json>
 *   node batch-pipeline.js mark --file <batch-manifest.json> --row <N> --status <状态> [--manifest-path <path>] [--error <msg>]
 *   node batch-pipeline.js retry-failed --file <batch-manifest.json>
 */

const fs = require('fs')
const path = require('path')
const { SKILLS_DIR, ACCOUNTS_DIR } = require('./lib/pipeline-utils')

// output/ 在项目根的父级（美图/output/）
const OUTPUT_BASE = path.join(SKILLS_DIR, '..', '..', '..', 'output')

// ============================================================================
// CLI 参数解析
// ============================================================================

function parseArgs(argv) {
  const args = {}
  for (let i = 0; i < argv.length; i++) {
    if (argv[i] === '--file' && argv[i + 1]) args.file = argv[++i]
    else if (argv[i] === '--account' && argv[i + 1]) args.account = argv[++i]
    else if (argv[i] === '--mode' && argv[i + 1]) args.mode = argv[++i]
    else if (argv[i] === '--row' && argv[i + 1]) args.row = parseInt(argv[++i])
    else if (argv[i] === '--status' && argv[i + 1]) args.status = argv[++i]
    else if (argv[i] === '--manifest-path' && argv[i + 1]) args.manifestPath = argv[++i]
    else if (argv[i] === '--error' && argv[i + 1]) args.error = argv[++i]
    else if (!args.command) args.command = argv[i]
  }
  return args
}

// ============================================================================
// init: 读 Excel/CSV → batch-manifest.json + 提取脚本文件
// ============================================================================

function cmdInit(args) {
  const filePath = path.resolve(args.file)
  if (!fs.existsSync(filePath)) {
    console.error(`文件不存在: ${filePath}`)
    process.exit(1)
  }

  const ext = path.extname(filePath).toLowerCase()
  let rows

  if (ext === '.csv') {
    rows = parseCsv(filePath)
  } else if (ext === '.xlsx' || ext === '.xls') {
    rows = parseExcel(filePath)
  } else {
    console.error(`不支持的格式: ${ext}，仅支持 .xlsx .xls .csv`)
    process.exit(1)
  }

  if (rows.length === 0) {
    console.error('表格为空（无数据行）')
    process.exit(1)
  }

  // 创建 batch 输出目录
  const dateStr = formatDate(new Date())
  let seq = 1
  while (fs.existsSync(path.join(OUTPUT_BASE, `batch_${dateStr}_${String(seq).padStart(3, '0')}`))) {
    seq++
  }
  const batchDir = path.join(OUTPUT_BASE, `batch_${dateStr}_${String(seq).padStart(3, '0')}`)
  const scriptsDir = path.join(batchDir, 'scripts')
  ensureDir(batchDir)
  ensureDir(scriptsDir)

  const defaultAccount = args.account || ''
  const defaultMode = args.mode || 'single'

  // 构建 items + 提取脚本
  const items = []
  for (let i = 0; i < rows.length; i++) {
    const row = rows[i]
    const script = extractField(row, ['脚本', 'script', '文案', '旁白'])
    const title = extractField(row, ['选题', '标题', 'title', 'name']) || `视频${i + 1}`
    const account = extractField(row, ['账号', 'account']) || defaultAccount
    const mode = extractField(row, ['模式', 'mode']) || defaultMode

    if (!script || !script.trim()) {
      console.warn(`  ⚠ 第 ${i + 2} 行（${title}）脚本为空，跳过`)
      continue
    }

    const scriptFile = path.join(scriptsDir, `row_${String(i + 1).padStart(3, '0')}.txt`)
    fs.writeFileSync(scriptFile, script.trim(), 'utf-8')

    items.push({
      row: i + 1,
      title,
      account: account || defaultAccount,
      mode: mode || defaultMode,
      scriptFile: `scripts/row_${String(i + 1).padStart(3, '0')}.txt`,
      status: 'pending',
      manifestPath: null,
      error: null,
    })
  }

  if (items.length === 0) {
    console.error('没有有效的脚本行')
    process.exit(1)
  }

  // 校验账号
  validateAccounts(items)

  // 写 batch-manifest
  const batchManifest = {
    source: path.basename(filePath),
    createdAt: new Date().toISOString(),
    defaults: { account: defaultAccount, mode: defaultMode },
    stats: calcStats(items),
    items,
  }

  const manifestPath = path.join(batchDir, 'batch-manifest.json')
  writeJson(manifestPath, batchManifest)

  console.log(`\n批量任务已创建: ${manifestPath}`)
  console.log(`  来源: ${path.basename(filePath)}`)
  console.log(`  总数: ${items.length}`)
  console.log(`  默认账号: ${defaultAccount || '(未指定，需每行填写)'}`)
  console.log(`  默认模式: ${defaultMode}`)
  console.log(`  脚本目录: ${scriptsDir}/`)
  console.log()
}

// ============================================================================
// status: 展示批量进度
// ============================================================================

function cmdStatus(args) {
  const manifestPath = path.resolve(args.file)
  const batch = readJson(manifestPath)
  const batchDir = path.dirname(manifestPath)

  console.log(`\n批量任务: ${batch.source}`)
  console.log(`  创建时间: ${batch.createdAt}`)
  console.log(`  进度: ${batch.stats.completed}/${batch.stats.total} 完成`)
  console.log()

  const grouped = { pending: [], processing: [], completed: [], failed: [] }
  for (const item of batch.items) {
    const list = grouped[item.status] || grouped.pending
    list.push(item)
  }

  if (grouped.completed.length > 0) {
    console.log(`  ✅ 完成 (${grouped.completed.length}):`)
    for (const it of grouped.completed) {
      console.log(`    #${it.row} ${it.title} → ${it.manifestPath || ''}`)
    }
  }

  if (grouped.failed.length > 0) {
    console.log(`  ❌ 失败 (${grouped.failed.length}):`)
    for (const it of grouped.failed) {
      console.log(`    #${it.row} ${it.title} — ${it.error || '未知错误'}`)
    }
  }

  if (grouped.processing.length > 0) {
    console.log(`  🔄 进行中 (${grouped.processing.length}):`)
    for (const it of grouped.processing) {
      console.log(`    #${it.row} ${it.title}`)
    }
  }

  if (grouped.pending.length > 0) {
    console.log(`  ⏳ 待处理 (${grouped.pending.length}):`)
    for (const it of grouped.pending) {
      console.log(`    #${it.row} ${it.title} (账号: ${it.account || '未指定'}, 模式: ${it.mode})`)
    }
  }

  // 输出下一个待处理的行号（方便 AI agent 消费）
  const next = batch.items.find(it => it.status === 'pending')
  if (next) {
    console.log(`\n  ▶ 下一条: #${next.row} (账号: ${next.account}, 模式: ${next.mode})`)
    console.log(`    脚本文件: ${path.resolve(batchDir, next.scriptFile)}`)
  }

  console.log()
}

// ============================================================================
// mark: 标记某行状态
// ============================================================================

function cmdMark(args) {
  const manifestPath = path.resolve(args.file)
  const batch = readJson(manifestPath)

  const item = batch.items.find(it => it.row === args.row)
  if (!item) {
    console.error(`行 ${args.row} 不存在`)
    process.exit(1)
  }

  const validStatuses = ['pending', 'processing', 'completed', 'failed']
  if (!validStatuses.includes(args.status)) {
    console.error(`无效状态: ${args.status}，可选: ${validStatuses.join(', ')}`)
    process.exit(1)
  }

  const oldStatus = item.status
  item.status = args.status
  if (args.manifestPath) item.manifestPath = args.manifestPath
  if (args.error) item.error = args.error
  if (args.status !== 'failed') item.error = null

  batch.stats = calcStats(batch.items)
  writeJson(manifestPath, batch)
  console.log(`#${item.row} ${item.title}: ${oldStatus} → ${args.status}`)
}

// ============================================================================
// retry-failed: 重置失败行
// ============================================================================

function cmdRetryFailed(args) {
  const manifestPath = path.resolve(args.file)
  const batch = readJson(manifestPath)

  let count = 0
  for (const item of batch.items) {
    if (item.status === 'failed') {
      item.status = 'pending'
      item.error = null
      count++
    }
  }

  batch.stats = calcStats(batch.items)
  writeJson(manifestPath, batch)
  console.log(`已重置 ${count} 条失败记录为 pending`)
}

// ============================================================================
// next: 输出下一条待处理的信息（机器友好格式）
// ============================================================================

function cmdNext(args) {
  const manifestPath = path.resolve(args.file)
  const batch = readJson(manifestPath)
  const batchDir = path.dirname(manifestPath)

  const item = batch.items.find(it => it.status === 'pending')
  if (!item) {
    console.log(JSON.stringify({ done: true }))
    return
  }

  console.log(JSON.stringify({
    done: false,
    row: item.row,
    title: item.title,
    account: item.account,
    mode: item.mode,
    scriptFile: path.resolve(batchDir, item.scriptFile),
  }))
}

// ============================================================================
// Helpers
// ============================================================================

function ensureDir(dir) {
  fs.mkdirSync(dir, { recursive: true })
}

function readJson(filePath) {
  return JSON.parse(fs.readFileSync(filePath, 'utf-8'))
}

function writeJson(filePath, data) {
  const tmp = filePath + '.tmp'
  fs.writeFileSync(tmp, JSON.stringify(data, null, 2), 'utf-8')
  fs.renameSync(tmp, filePath)
}

function calcStats(items) {
  const stats = { total: items.length, pending: 0, processing: 0, completed: 0, failed: 0 }
  for (const item of items) {
    if (stats[item.status] !== undefined) stats[item.status]++
    else stats.pending++
  }
  return stats
}

function formatDate(d) {
  return [
    d.getFullYear(),
    String(d.getMonth() + 1).padStart(2, '0'),
    String(d.getDate()).padStart(2, '0'),
  ].join('')
}

function extractField(row, names) {
  for (const name of names) {
    if (row[name] != null && String(row[name]).trim()) return String(row[name]).trim()
  }
  return ''
}

function validateAccounts(items) {
  const uniqueAccounts = [...new Set(items.map(it => it.account).filter(Boolean))]
  const missing = uniqueAccounts.filter(acc => {
    return !fs.existsSync(path.join(ACCOUNTS_DIR, acc, 'account.json'))
  })

  if (missing.length > 0) {
    console.warn(`\n  ⚠ 以下账号不存在: ${missing.join(', ')}`)
    const available = fs.readdirSync(ACCOUNTS_DIR).filter(d => {
      if (d.startsWith('_')) return false
      return fs.existsSync(path.join(ACCOUNTS_DIR, d, 'account.json'))
    })
    console.warn('  可用账号:')
    for (const acc of available) {
      try {
        const cfg = readJson(path.join(ACCOUNTS_DIR, acc, 'account.json'))
        console.warn(`    - ${acc} (${cfg.name})`)
      } catch {}
    }
    console.warn()
  }
}

// ============================================================================
// Excel / CSV 解析
// ============================================================================

function parseExcel(filePath) {
  try {
    const XLSX = require('xlsx')
    const workbook = XLSX.readFile(filePath)
    const sheetName = workbook.SheetNames[0]
    const sheet = workbook.Sheets[sheetName]
    return XLSX.utils.sheet_to_json(sheet)
  } catch (err) {
    if (err.code === 'MODULE_NOT_FOUND') {
      console.error('需要安装 xlsx: cd scripts && pnpm add xlsx')
      process.exit(1)
    }
    throw err
  }
}

function parseCsv(filePath) {
  const content = fs.readFileSync(filePath, 'utf-8')
  const lines = content.split(/\r?\n/).filter(l => l.trim())
  if (lines.length < 2) return []

  const headers = parseCsvLine(lines[0])
  const rows = []
  for (let i = 1; i < lines.length; i++) {
    const values = parseCsvLine(lines[i])
    const row = {}
    headers.forEach((h, j) => { row[h.trim()] = (values[j] || '').trim() })
    rows.push(row)
  }
  return rows
}

function parseCsvLine(line) {
  const result = []
  let current = ''
  let inQuotes = false
  for (const char of line) {
    if (char === '"') { inQuotes = !inQuotes }
    else if (char === ',' && !inQuotes) { result.push(current); current = '' }
    else { current += char }
  }
  result.push(current)
  return result
}

// ============================================================================
// CLI 入口
// ============================================================================

function main() {
  const args = parseArgs(process.argv.slice(2))
  const command = args.command

  if (command === 'init') {
    if (!args.file) {
      console.error('用法: batch-pipeline.js init --file <xlsx/csv> [--account <账号>] [--mode <模式>]')
      process.exit(1)
    }
    cmdInit(args)
  } else if (command === 'status') {
    if (!args.file) {
      console.error('用法: batch-pipeline.js status --file <batch-manifest.json>')
      process.exit(1)
    }
    cmdStatus(args)
  } else if (command === 'mark') {
    if (!args.file || !args.row || !args.status) {
      console.error('用法: batch-pipeline.js mark --file <batch-manifest.json> --row <N> --status <pending|processing|completed|failed> [--manifest-path <path>] [--error <msg>]')
      process.exit(1)
    }
    cmdMark(args)
  } else if (command === 'retry-failed') {
    if (!args.file) {
      console.error('用法: batch-pipeline.js retry-failed --file <batch-manifest.json>')
      process.exit(1)
    }
    cmdRetryFailed(args)
  } else if (command === 'next') {
    if (!args.file) {
      console.error('用法: batch-pipeline.js next --file <batch-manifest.json>')
      process.exit(1)
    }
    cmdNext(args)
  } else {
    console.log('批量视频生产编排器')
    console.log('')
    console.log('用法:')
    console.log('  batch-pipeline.js init --file <xlsx/csv> [--account <账号>] [--mode <single|framePair>]')
    console.log('  batch-pipeline.js status --file <batch-manifest.json>')
    console.log('  batch-pipeline.js next --file <batch-manifest.json>')
    console.log('  batch-pipeline.js mark --file <...> --row <N> --status <pending|processing|completed|failed> [--manifest-path <path>] [--error <msg>]')
    console.log('  batch-pipeline.js retry-failed --file <batch-manifest.json>')
    console.log('')
    console.log('Excel 格式:')
    console.log('  选题 | 脚本 | 账号 | 模式')
    console.log('  选题/标题/title — 标题（可选）')
    console.log('  脚本/文案/旁白 — 口播文案（必填）')
    console.log('  账号/account — 账号ID（可选，可由 --account 指定默认值）')
    console.log('  模式/mode — single|framePair（可选，可由 --mode 指定默认值）')
  }
}

if (require.main === module) {
  main()
}

module.exports = { cmdInit, cmdStatus, cmdMark, cmdRetryFailed, cmdNext }