import { useRef, useState } from 'react'
import { Box, Button, Card, Chip, CircularProgress, IconButton, TextField, Typography } from '@mui/material'
import { Mic, MicOff, Sparkles, X } from 'lucide-react'

interface Props {
  text: string
  onTextChange: (s: string) => void
  onAiSubmit: () => void
  isAnalyzing: boolean
  isAutoGen: boolean
}

const EXAMPLES = [
  'Büro 800–1000 m² Zürich-West, ab Sept. 2025, max. CHF 45/m², ÖV-Anbindung',
  'Retail-Fläche 200–400 m² Bern Innenstadt, Erdgeschoss, max. CHF 150/m², sofort',
  'Lagerhalle 2000–3000 m² Basel, Rampe, 12 m Deckenhöhe, max. CHF 15/m²',
]

const isSpeechSupported = typeof window !== 'undefined' &&
  ('SpeechRecognition' in window || 'webkitSpeechRecognition' in window)

export function VoiceNeedInput({ text, onTextChange, onAiSubmit, isAnalyzing, isAutoGen }: Props) {
  const [isRecording, setIsRecording] = useState(false)
  const [interimText, setInterimText] = useState('')
  const recognitionRef = useRef<any>(null)
  const accumulatedRef = useRef('')

  function startRecording() {
    const SpeechAPI = (window as any).SpeechRecognition ?? (window as any).webkitSpeechRecognition
    if (!SpeechAPI) return

    accumulatedRef.current = text
    const rec = new SpeechAPI()
    rec.lang = 'de-DE'
    rec.continuous = true
    rec.interimResults = true

    rec.onresult = (e: any) => {
      let finalPart = ''
      let interimPart = ''
      for (let i = e.resultIndex; i < e.results.length; i++) {
        const t = e.results[i][0].transcript
        if (e.results[i].isFinal) finalPart += t
        else interimPart += t
      }
      if (finalPart) {
        accumulatedRef.current = (accumulatedRef.current + ' ' + finalPart).trim()
        onTextChange(accumulatedRef.current)
      }
      setInterimText(interimPart)
    }

    rec.onend = () => {
      setIsRecording(false)
      setInterimText('')
      if (accumulatedRef.current.length >= 15) onAiSubmit()
    }

    rec.onerror = () => { setIsRecording(false); setInterimText('') }
    rec.start()
    recognitionRef.current = rec
    setIsRecording(true)
  }

  function stopRecording() {
    recognitionRef.current?.stop()
  }

  // Show interim text inside the field while recording
  const displayValue = isRecording && interimText
    ? (text + (text ? ' ' : '') + interimText)
    : text

  return (
    <Card
      elevation={0}
      sx={{
        p: 3,
        border: '1px solid',
        borderColor: isRecording ? '#dc2626' : '#e2e8f0',
        transition: 'border-color 0.2s',
        bgcolor: isRecording ? '#fff5f5' : 'white',
      }}
    >
      <Box sx={{ display: 'flex', alignItems: 'flex-start', justifyContent: 'space-between', mb: 1.5 }}>
        <Box>
          <Typography variant="h6" sx={{ fontWeight: 700, lineHeight: 1.3 }}>
            Bedarf beschreiben
          </Typography>
          <Typography variant="caption" color="text.secondary">
            Schreiben oder sprechen — die KI extrahiert alle Kriterien automatisch
          </Typography>
        </Box>

        {isRecording ? (
          <Chip
            size="small"
            label="🎤 Aufnahme läuft…"
            onClick={stopRecording}
            sx={{ bgcolor: '#fef2f2', color: '#dc2626', fontWeight: 600, fontSize: 11, cursor: 'pointer' }}
          />
        ) : isAnalyzing ? (
          <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
            <CircularProgress size={14} sx={{ color: '#1e3a5f' }} />
            <Typography variant="caption" sx={{ color: '#1e3a5f', fontWeight: 600 }}>Analysiert…</Typography>
          </Box>
        ) : isAutoGen && text ? (
          <Typography variant="caption" sx={{ color: '#1e3a5f', fontSize: 11 }}>⚡ auto-synchronisiert</Typography>
        ) : null}
      </Box>

      {/* Textarea + mic */}
      <Box sx={{ position: 'relative' }}>
        <TextField
          multiline
          rows={4}
          fullWidth
          placeholder="Wir suchen 800–1.000 m² Bürofläche in Zürich-West, verfügbar ab September 2025, Budget max. 45 CHF/m². Wichtig: gute ÖV-Anbindung, moderne Infrastruktur."
          value={displayValue}
          onChange={e => {
            setInterimText('')
            onTextChange(e.target.value)
          }}
          disabled={isRecording || isAnalyzing}
          slotProps={{ htmlInput: { maxLength: 2000 } }}
          sx={{
            '& .MuiOutlinedInput-root': {
              pr: '52px',
              bgcolor: isAutoGen && !isRecording ? '#f0f7ff' : 'transparent',
              transition: 'background-color 0.2s',
              '& textarea': { color: isRecording && interimText ? '#64748b' : 'inherit' },
            },
          }}
        />
        <Box sx={{ position: 'absolute', bottom: 10, right: 10 }}>
          {isRecording ? (
            <IconButton
              onClick={stopRecording}
              size="small"
              sx={{
                bgcolor: '#dc2626', color: 'white', '&:hover': { bgcolor: '#b91c1c' },
                animation: 'micPulse 1.2s ease-in-out infinite',
                '@keyframes micPulse': {
                  '0%, 100%': { boxShadow: '0 0 0 0 rgba(220,38,38,0.4)' },
                  '50%': { boxShadow: '0 0 0 6px rgba(220,38,38,0)' },
                },
              }}
            >
              <MicOff size={16} />
            </IconButton>
          ) : (
            <IconButton
              onClick={isSpeechSupported ? startRecording : undefined}
              size="small"
              disabled={isAnalyzing || !isSpeechSupported}
              title={isSpeechSupported ? 'Spracheingabe starten' : 'Spracheingabe nicht verfügbar'}
              sx={{ bgcolor: '#f1f5f9', color: '#475569', '&:hover': { bgcolor: '#e2e8f0' }, '&:disabled': { opacity: 0.35 } }}
            >
              <Mic size={16} />
            </IconButton>
          )}
        </Box>
      </Box>

      {/* Actions row */}
      <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', mt: 1.5 }}>
        {/* Example prompts */}
        <Box sx={{ display: 'flex', gap: 0.5, flexWrap: 'wrap' }}>
          {EXAMPLES.map((ex, i) => (
            <Chip
              key={i}
              label={ex.slice(0, 32) + '…'}
              size="small"
              variant="outlined"
              clickable
              onClick={() => onTextChange(ex)}
              sx={{ fontSize: 10, height: 20 }}
            />
          ))}
        </Box>

        <Box sx={{ display: 'flex', gap: 1, flexShrink: 0, ml: 1 }}>
          {text && !isRecording && (
            <IconButton size="small" onClick={() => onTextChange('')} sx={{ color: '#94a3b8', p: 0.5 }}>
              <X size={14} />
            </IconButton>
          )}
          <Button
            size="small"
            variant="outlined"
            disabled={!text.trim() || isAnalyzing || isRecording}
            onClick={onAiSubmit}
            endIcon={<Sparkles size={13} />}
            sx={{ fontSize: 12, whiteSpace: 'nowrap' }}
          >
            KI Auto-fill
          </Button>
        </Box>
      </Box>
    </Card>
  )
}