/**
 * CapCut API 基础设施层
 *
 * 提供: 配置加载、API 封装、CLI 解析、工具函数
 * 无业务逻辑，纯基础设施。
 */

const axios = require('axios')
const path = require('path')
const fs = require('fs')
const { execFile } = require('child_process')

const US = 1_000_000

let _config = null
function getConfig() {
  if (_config) return _config
  const configPath = path.join(__dirname, '..', '..', '..', 'config.json')
  if (!fs.existsSync(configPath)) {
    console.error('缺少配置文件: skills/config.json')
    console.error('请运行 node setup.js 生成配置')
    process.exit(1)
  }
  const config = JSON.parse(fs.readFileSync(configPath, 'utf-8'))
  if (!config.jianyingDraftPath || !config.capcutMateDir || !config.capcutMateApiBase) {
    console.error('config.json 需要填写 jianyingDraftPath、capcutMateDir 和 capcutMateApiBase')
    process.exit(1)
  }
  _config = config
  return _config
}

const BASE_URL = getConfig().capcutMateApiBase

async function api(endpoint, data = {}, timeout = 60000) {
  const url = `${BASE_URL}/${endpoint}`
  const method = endpoint === 'get_draft' ? 'get' : 'post'
  try {
    const res = method === 'get'
      ? await axios.get(url, { params: data, timeout })
      : await axios.post(url, data, { timeout })
    if (res.data.code !== undefined && res.data.code !== 0) {
      throw new Error(`API [${endpoint}] 返回错误: ${res.data.message}`)
    }
    return res.data
  } catch (err) {
    if (err.response) {
      throw new Error(`API [${endpoint}] HTTP ${err.response.status}: ${JSON.stringify(err.response.data)}`)
    }
    throw err
  }
}

function parseArgs(argv) {
  const args = {}
  for (let i = 0; i < argv.length; i++) {
    if (argv[i].startsWith('--')) {
      const key = argv[i].slice(2)
      const value = argv[i + 1]
      if (value && !value.startsWith('--')) {
        args[key] = value
        i++
      } else {
        args[key] = true
      }
    }
  }
  return args
}

function getResolution(format) {
  const map = {
    '9:16': { width: 1080, height: 1920 },
    '16:9': { width: 1920, height: 1080 },
    '1:1':  { width: 1080, height: 1080 },
    '4:3':  { width: 1440, height: 1080 },
  }
  return map[format] || map['9:16']
}

function getAudioDurationSec(filePath) {
  return new Promise((resolve) => {
    execFile('ffprobe', [
      '-v', 'quiet', '-show_entries', 'format=duration',
      '-of', 'csv=p=0', filePath
    ], (err, stdout) => {
      if (err) { resolve(null); return }
      const dur = parseFloat(stdout.trim())
      resolve(dur > 0 ? dur : null)
    })
  })
}

module.exports = { US, getConfig, BASE_URL, api, parseArgs, getResolution, getAudioDurationSec }