/**
 * Composable for recording audio (voice messages)
 * Uses MediaRecorder API to capture audio from microphone
 */

interface AudioRecorderState {
  isRecording: boolean
  isPaused: boolean
  duration: number
  audioBlob: Blob | null
  audioUrl: string | null
  error: string | null
}

export function useAudioRecorder() {
  const state = reactive<AudioRecorderState>({
    isRecording: false,
    isPaused: false,
    duration: 0,
    audioBlob: null,
    audioUrl: null,
    error: null
  })

  let mediaRecorder: MediaRecorder | null = null
  let audioChunks: Blob[] = []
  let stream: MediaStream | null = null
  let durationInterval: NodeJS.Timeout | null = null
  let startTime: number = 0

  // Check if browser supports audio recording
  const isSupported = computed(() => {
    return typeof navigator !== 'undefined' &&
           navigator.mediaDevices &&
           typeof navigator.mediaDevices.getUserMedia === 'function'
  })

  // Get preferred MIME type for recording
  // Prefer ogg/opus as it's required by WhatsApp for voice notes
  const getMimeType = (): string => {
    const types = [
      'audio/ogg;codecs=opus',  // Preferred for WhatsApp PTT
      'audio/ogg',
      'audio/webm;codecs=opus',
      'audio/webm',
      'audio/mp4',
      'audio/mpeg'
    ]

    for (const type of types) {
      if (MediaRecorder.isTypeSupported(type)) {
        console.log('[AudioRecorder] Using MIME type:', type)
        return type
      }
    }

    console.warn('[AudioRecorder] No preferred type supported, using webm fallback')
    return 'audio/webm' // fallback
  }

  // Start recording
  const startRecording = async (): Promise<boolean> => {
    if (!isSupported.value) {
      state.error = 'La grabación de audio no está soportada en este navegador'
      return false
    }

    try {
      // Reset state
      state.error = null
      state.audioBlob = null
      state.audioUrl = null
      audioChunks = []

      // Request microphone access
      stream = await navigator.mediaDevices.getUserMedia({
        audio: {
          echoCancellation: true,
          noiseSuppression: true,
          autoGainControl: true
        }
      })

      // Create MediaRecorder
      const mimeType = getMimeType()
      mediaRecorder = new MediaRecorder(stream, { mimeType })

      // Handle data available
      mediaRecorder.ondataavailable = (event) => {
        if (event.data.size > 0) {
          audioChunks.push(event.data)
        }
      }

      // Handle recording stop
      mediaRecorder.onstop = () => {
        // Create blob from chunks
        const mimeType = mediaRecorder?.mimeType || 'audio/webm'
        state.audioBlob = new Blob(audioChunks, { type: mimeType })
        state.audioUrl = URL.createObjectURL(state.audioBlob)

        // Stop all tracks
        if (stream) {
          stream.getTracks().forEach(track => track.stop())
          stream = null
        }

        // Clear interval
        if (durationInterval) {
          clearInterval(durationInterval)
          durationInterval = null
        }

        state.isRecording = false
        state.isPaused = false
      }

      // Handle errors
      mediaRecorder.onerror = (event: any) => {
        console.error('MediaRecorder error:', event.error)
        state.error = 'Error durante la grabación'
        stopRecording()
      }

      // Start recording
      mediaRecorder.start(100) // Collect data every 100ms
      state.isRecording = true
      startTime = Date.now()

      // Update duration every 100ms
      durationInterval = setInterval(() => {
        if (state.isRecording && !state.isPaused) {
          state.duration = Math.floor((Date.now() - startTime) / 1000)
        }
      }, 100)

      return true
    } catch (error: any) {
      console.error('Error starting recording:', error)

      if (error.name === 'NotAllowedError') {
        state.error = 'Permiso de micrófono denegado'
      } else if (error.name === 'NotFoundError') {
        state.error = 'No se encontró micrófono'
      } else {
        state.error = 'Error al iniciar la grabación'
      }

      return false
    }
  }

  // Stop recording and finalize
  const stopRecording = (): void => {
    if (mediaRecorder && state.isRecording) {
      mediaRecorder.stop()
    }
  }

  // Cancel recording without saving
  const cancelRecording = (): void => {
    if (mediaRecorder && state.isRecording) {
      mediaRecorder.stop()
    }

    // Clean up without keeping the audio
    state.audioBlob = null
    state.audioUrl = null
    state.duration = 0

    if (stream) {
      stream.getTracks().forEach(track => track.stop())
      stream = null
    }

    if (durationInterval) {
      clearInterval(durationInterval)
      durationInterval = null
    }

    audioChunks = []
    state.isRecording = false
    state.isPaused = false
  }

  // Pause recording
  const pauseRecording = (): void => {
    if (mediaRecorder && mediaRecorder.state === 'recording') {
      mediaRecorder.pause()
      state.isPaused = true
    }
  }

  // Resume recording
  const resumeRecording = (): void => {
    if (mediaRecorder && mediaRecorder.state === 'paused') {
      mediaRecorder.resume()
      state.isPaused = false
    }
  }

  // Convert blob to File for upload
  const getAudioFile = (filename?: string): File | null => {
    if (!state.audioBlob) return null

    const extension = state.audioBlob.type.includes('ogg') ? 'ogg' : 'webm'
    const name = filename || `audio-${Date.now()}.${extension}`

    return new File([state.audioBlob], name, { type: state.audioBlob.type })
  }

  // Clear recorded audio
  const clearAudio = (): void => {
    if (state.audioUrl) {
      URL.revokeObjectURL(state.audioUrl)
    }
    state.audioBlob = null
    state.audioUrl = null
    state.duration = 0
    state.error = null
  }

  // Cleanup on unmount
  onUnmounted(() => {
    cancelRecording()
    clearAudio()
  })

  return {
    // State
    isRecording: computed(() => state.isRecording),
    isPaused: computed(() => state.isPaused),
    duration: computed(() => state.duration),
    audioBlob: computed(() => state.audioBlob),
    audioUrl: computed(() => state.audioUrl),
    error: computed(() => state.error),
    isSupported,

    // Methods
    startRecording,
    stopRecording,
    cancelRecording,
    pauseRecording,
    resumeRecording,
    getAudioFile,
    clearAudio
  }
}