'use client'

import { useEffect, useRef, useState, useCallback } from 'react'
import { VoiceAPI, VoiceMessage, VoiceTask } from '@/lib/voice/voice-api'
import { VoiceIndicator } from './VoiceIndicator'

interface VoiceCaptureProps {
  onTranscript?: (text: string, isFinal: boolean) => void
  onIntent?: (intent: string, parameters: Record<string, unknown>) => void
  onResponse?: (text: string) => void
  onTaskCreated?: (task: VoiceTask) => void
  onError?: (error: Error) => void
  className?: string
}

/**
 * Voice capture component with microphone button
 * Handles WebSocket connection and audio streaming
 */
export function VoiceCapture({
  onTranscript,
  onIntent,
  onResponse,
  onTaskCreated,
  onError,
  className = '',
}: VoiceCaptureProps) {
  const voiceApiRef = useRef<VoiceAPI | null>(null)
  const [isInitialized, setIsInitialized] = useState(false)
  const [isConnected, setIsConnected] = useState(false)
  const [isListening, setIsListening] = useState(false)
  const [status, setStatus] = useState<string>('idle')
  const [audioLevel, setAudioLevel] = useState(0)
  const [transcript, setTranscript] = useState<string>('')
  const [error, setError] = useState<string | null>(null)

  // Initialize voice API
  useEffect(() => {
    const init = async () => {
      try {
        const api = new VoiceAPI()
        await api.initialize()
        voiceApiRef.current = api

        // Set up event handlers
        api.setOnMessage(handleMessage)
        api.setOnError(handleError)
        api.setOnStatusChange(handleStatusChange)

        setIsInitialized(true)
      } catch (e) {
        console.error('Failed to initialize voice API:', e)
        setError('Sprachdienst konnte nicht initialisiert werden')
      }
    }

    init()

    return () => {
      voiceApiRef.current?.disconnect()
    }
  }, [])

  const handleMessage = useCallback(
    (message: VoiceMessage) => {
      switch (message.type) {
        case 'transcript':
          setTranscript(message.text)
          onTranscript?.(message.text, message.final)
          break

        case 'intent':
          onIntent?.(message.intent, message.parameters)
          break

        case 'response':
          onResponse?.(message.text)
          break

        case 'task_created':
          onTaskCreated?.({
            id: message.task_id,
            session_id: '',
            type: message.task_type,
            state: message.state,
            created_at: new Date().toISOString(),
            updated_at: new Date().toISOString(),
            result_available: false,
          })
          break

        case 'error':
          setError(message.message)
          onError?.(new Error(message.message))
          break
      }
    },
    [onTranscript, onIntent, onResponse, onTaskCreated, onError]
  )

  const handleError = useCallback(
    (error: Error) => {
      setError(error.message)
      setIsListening(false)
      onError?.(error)
    },
    [onError]
  )

  const handleStatusChange = useCallback((newStatus: string) => {
    setStatus(newStatus)

    if (newStatus === 'connected') {
      setIsConnected(true)
    } else if (newStatus === 'disconnected') {
      setIsConnected(false)
      setIsListening(false)
    } else if (newStatus === 'listening') {
      setIsListening(true)
    } else if (newStatus === 'processing') {
      setIsListening(false)
    }
  }, [])

  const toggleListening = async () => {
    if (!voiceApiRef.current) return

    try {
      setError(null)

      if (isListening) {
        // Stop listening
        voiceApiRef.current.stopCapture()
        setIsListening(false)
      } else {
        // Start listening
        if (!isConnected) {
          await voiceApiRef.current.connect()
        }
        await voiceApiRef.current.startCapture()
        setIsListening(true)
      }
    } catch (e) {
      console.error('Failed to toggle listening:', e)
      setError('Mikrofon konnte nicht aktiviert werden')
    }
  }

  const interrupt = () => {
    voiceApiRef.current?.interrupt()
  }

  if (!isInitialized) {
    return (
      <div className={`flex items-center gap-2 ${className}`}>
        <div className="animate-spin w-6 h-6 border-2 border-gray-300 border-t-blue-500 rounded-full" />
        <span className="text-sm text-gray-500">Initialisiere...</span>
      </div>
    )
  }

  return (
    <div className={`flex flex-col gap-4 ${className}`}>
      {/* Error display */}
      {error && (
        <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-2 rounded-lg text-sm">
          {error}
        </div>
      )}

      {/* Main controls */}
      <div className="flex items-center gap-4">
        {/* Microphone button */}
        <button
          onClick={toggleListening}
          disabled={status === 'processing'}
          className={`
            relative w-16 h-16 rounded-full flex items-center justify-center
            transition-all duration-200 focus:outline-none focus:ring-4
            ${
              isListening
                ? 'bg-red-500 hover:bg-red-600 focus:ring-red-200'
                : 'bg-blue-500 hover:bg-blue-600 focus:ring-blue-200'
            }
            ${status === 'processing' ? 'opacity-50 cursor-not-allowed' : ''}
          `}
        >
          {/* Microphone icon */}
          <svg
            xmlns="http://www.w3.org/2000/svg"
            viewBox="0 0 24 24"
            fill="white"
            className="w-8 h-8"
          >
            {isListening ? (
              // Stop icon
              <path d="M6 6h12v12H6z" />
            ) : (
              // Microphone icon
              <path d="M12 14c1.66 0 3-1.34 3-3V5c0-1.66-1.34-3-3-3S9 3.34 9 5v6c0 1.66 1.34 3 3 3zm-1 1.93c-3.94-.49-7-3.85-7-7.93h2c0 2.76 2.24 5 5 5s5-2.24 5-5h2c0 4.08-3.06 7.44-7 7.93V18h4v2H8v-2h4v-2.07z" />
            )}
          </svg>

          {/* Pulsing ring when listening */}
          {isListening && (
            <span className="absolute inset-0 rounded-full animate-ping bg-red-400 opacity-25" />
          )}
        </button>

        {/* Status indicator */}
        <VoiceIndicator
          isListening={isListening}
          audioLevel={audioLevel}
          status={status}
        />

        {/* Interrupt button (when responding) */}
        {status === 'responding' && (
          <button
            onClick={interrupt}
            className="px-4 py-2 text-sm bg-gray-200 hover:bg-gray-300 rounded-lg"
          >
            Unterbrechen
          </button>
        )}
      </div>

      {/* Transcript display */}
      {transcript && (
        <div className="bg-gray-50 border border-gray-200 rounded-lg p-4">
          <p className="text-sm text-gray-500 mb-1">Erkannt:</p>
          <p className="text-gray-800">{transcript}</p>
        </div>
      )}

      {/* Instructions */}
      <p className="text-xs text-gray-400">
        {isListening
          ? 'Sprechen Sie jetzt... Klicken Sie erneut zum Beenden.'
          : 'Klicken Sie auf das Mikrofon und sprechen Sie Ihren Befehl.'}
      </p>
    </div>
  )
}