/* 监控摄像头 RTSP 地址拼装 / 反解析（后台频道表单与测试脚本共用）
 *
 * 支持品牌：
 *   hikvision 海康威视 / 萤石   rtsp://u:p@ip:554/Streaming/Channels/{通道}01 主码流 / {通道}02 子码流
 *   dahua     大华             rtsp://u:p@ip:554/cam/realmonitor?channel={通道}&subtype=0 主 / 1 子
 *   uniview   宇视             rtsp://u:p@ip:554/video1 主 / video2 子
 *   tplink    TP-LINK / 水星   rtsp://u:p@ip:554/stream1 主 / stream2 子
 *   custom    其他 / 手动路径   rtsp://u:p@ip:554/{路径}
 */
;(function (root) {
  const BRANDS = [
    { key: 'hikvision', name: '海康威视 / 萤石' },
    { key: 'dahua', name: '大华' },
    { key: 'uniview', name: '宇视' },
    { key: 'tplink', name: 'TP-LINK / 水星' },
    { key: 'custom', name: '其他（手动填路径）' }
  ]

  const enc = (s) => String(s == null ? '' : s).trim()

  /**
   * 拼装 RTSP 地址
   * o = { brand, host, port, user, pass, channel, stream('main'|'sub'), path }
   * 返回 { ok:true, url } 或 { ok:false, error }
   */
  function build(o) {
    const brand = enc(o.brand) || 'hikvision'
    const host = enc(o.host)
    const port = enc(o.port) || '554'
    const user = enc(o.user)
    const pass = enc(o.pass)
    const ch = Math.max(1, Math.floor(Number(o.channel) || 1))
    const stream = o.stream === 'sub' ? 'sub' : 'main'
    const path = enc(o.path).replace(/^\/+/, '')
    if (!host) return { ok: false, error: '请填写摄像头 IP 地址' }
    if (!/^[a-zA-Z0-9._-]+$/.test(host)) return { ok: false, error: `IP 地址格式不正确：${host}` }
    if (!/^\d{1,5}$/.test(port) || Number(port) > 65535) return { ok: false, error: `端口格式不正确：${port}` }
    if (brand === 'custom' && !path) return { ok: false, error: '「其他」品牌需要填写 RTSP 路径（如 Streaming/Channels/101）' }
    let suffix
    if (brand === 'hikvision') suffix = `/Streaming/Channels/${ch}0${stream === 'sub' ? 2 : 1}`
    else if (brand === 'dahua') suffix = `/cam/realmonitor?channel=${ch}&subtype=${stream === 'sub' ? 1 : 0}`
    else if (brand === 'uniview') suffix = `/video${stream === 'sub' ? 2 : 1}`
    else if (brand === 'tplink') suffix = `/stream${stream === 'sub' ? 2 : 1}`
    else suffix = `/${path}`
    const cred = user ? `${user}:${pass}@` : ''
    return { ok: true, url: `rtsp://${cred}${host}:${port}${suffix}` }
  }

  /**
   * 反解析：把 rtsp:// 地址还原为表单字段（品牌识别 best-effort）
   * 返回 { brand, host, port, user, pass, channel, stream, path }
   */
  function parse(url) {
    const out = { brand: 'custom', host: '', port: '554', user: '', pass: '', channel: 1, stream: 'main', path: '' }
    const m = /^rtsp:\/\/(?:([^:\/@]+)(?::([^\/@]*))?@)?([^:\/@]+)(?::(\d{1,5}))?(?:\/(.*))?$/i.exec(String(url || '').trim())
    if (!m) return out
    out.user = m[1] || ''
    out.pass = m[2] || ''
    out.host = m[3] || ''
    if (m[4]) out.port = m[4]
    const tail = m[5] || ''
    let mm
    if ((mm = /^Streaming\/Channels\/(\d+)0([12])$/i.exec(tail))) {
      out.brand = 'hikvision'
      out.channel = Math.max(1, parseInt(mm[1], 10) || 1)
      out.stream = mm[2] === '2' ? 'sub' : 'main'
    } else if ((mm = /^cam\/realmonitor\?channel=(\d+)&subtype=([01])$/i.exec(tail))) {
      out.brand = 'dahua'
      out.channel = Math.max(1, parseInt(mm[1], 10) || 1)
      out.stream = mm[2] === '1' ? 'sub' : 'main'
    } else if ((mm = /^video([12])$/i.exec(tail))) {
      out.brand = 'uniview'
      out.stream = mm[1] === '2' ? 'sub' : 'main'
    } else if ((mm = /^stream([12])$/i.exec(tail))) {
      out.brand = 'tplink'
      out.stream = mm[1] === '2' ? 'sub' : 'main'
    } else {
      out.brand = 'custom'
      out.path = tail
    }
    return out
  }

  const api = { BRANDS, build, parse }
  if (typeof module !== 'undefined' && module.exports) module.exports = api
  root.CameraURL = api
})(typeof window !== 'undefined' ? window : globalThis)