/**
 * Composable para gestionar streams de video desde go2rtc
 * Usa proxy backend para evitar problemas de CORS/cookies entre subdominios
 * API Proxy: /api/streams/list
 * Streaming: https://streams.nucleoriofrio.com (iframe con sesion propia)
 */

export type StreamType = 'webrtc' | 'mse' | 'mp4' | 'hls' | 'mjpeg'

export interface StreamTypeOption {
  label: string
  value: StreamType
  description: string
  useIframe: boolean
}

export const STREAM_TYPES: StreamTypeOption[] = [
  {
    label: 'WebRTC',
    value: 'webrtc',
    description: 'Menor latencia',
    useIframe: true
  },
  {
    label: 'MSE',
    value: 'mse',
    description: 'Media Source Extensions',
    useIframe: true
  },
  {
    label: 'MP4',
    value: 'mp4',
    description: 'Streaming MP4',
    useIframe: false
  },
  {
    label: 'HLS',
    value: 'hls',
    description: 'HTTP Live Streaming',
    useIframe: false
  },
  {
    label: 'MJPEG',
    value: 'mjpeg',
    description: 'Motion JPEG',
    useIframe: false
  }
]

export const useStreams = () => {
  const BASE_URL = 'https://streams.nucleoriofrio.com'

  // Estado reactivo
  const streams = useState<string[]>('streams_list', () => [])
  const selectedStream = useState<string | null>('streams_selected', () => null)
  const selectedType = useState<StreamType>('streams_type', () => 'mse')
  const isLoading = useState<boolean>('streams_loading', () => false)
  const error = useState<string | null>('streams_error', () => null)

  /**
   * Obtiene la lista de streams disponibles via proxy backend
   */
  const fetchStreams = async (): Promise<void> => {
    isLoading.value = true
    error.value = null

    try {
      // Usar proxy backend para evitar CORS/cookies issues
      const response = await $fetch<Record<string, unknown>>('/api/streams/list')

      // Extraer nombres de streams del objeto
      streams.value = Object.keys(response).sort()

      // Seleccionar el primero si no hay ninguno seleccionado
      if (streams.value.length > 0 && !selectedStream.value) {
        selectedStream.value = streams.value[0]
      }
    } catch (err: unknown) {
      const errorMessage = (err as Error)?.message || 'Error al cargar streams'
      error.value = errorMessage
      console.error('[Streams] Error fetching streams:', err)
    } finally {
      isLoading.value = false
    }
  }

  /**
   * Genera la URL del stream segun el tipo seleccionado
   */
  const getStreamUrl = computed((): string | null => {
    if (!selectedStream.value) return null

    const streamName = encodeURIComponent(selectedStream.value)

    switch (selectedType.value) {
      case 'webrtc':
        return `${BASE_URL}/stream.html?src=${streamName}`
      case 'mse':
        return `${BASE_URL}/stream.html?src=${streamName}&mode=mse`
      case 'mp4':
        return `${BASE_URL}/api/stream.mp4?src=${streamName}`
      case 'hls':
        return `${BASE_URL}/api/stream.m3u8?src=${streamName}`
      case 'mjpeg':
        return `${BASE_URL}/api/stream.mjpeg?src=${streamName}`
      default:
        return null
    }
  })

  /**
   * Determina si se debe usar iframe o video nativo
   */
  const useIframe = computed((): boolean => {
    const typeConfig = STREAM_TYPES.find(t => t.value === selectedType.value)
    return typeConfig?.useIframe ?? true
  })

  /**
   * Obtiene las opciones para el dropdown de tipos
   */
  const streamTypeOptions = computed(() => {
    return STREAM_TYPES.map(type => ({
      label: type.label,
      value: type.value
    }))
  })

  /**
   * Obtiene las opciones para el dropdown de streams
   */
  const streamOptions = computed(() => {
    return streams.value.map(name => ({
      label: name.replace(/_/g, ' '),
      value: name
    }))
  })

  /**
   * Limpia el error
   */
  const clearError = () => {
    error.value = null
  }

  return {
    // Estado
    streams: readonly(streams),
    selectedStream,
    selectedType,
    isLoading: readonly(isLoading),
    error: readonly(error),

    // Computed
    getStreamUrl,
    useIframe,
    streamTypeOptions,
    streamOptions,

    // Metodos
    fetchStreams,
    clearError,

    // Constantes
    STREAM_TYPES
  }
}