'use client'
import { useEffect, useRef, useState } from 'react'
import { motion, AnimatePresence } from 'framer-motion'

type VoiceState = 'idle' | 'wake' | 'command' | 'response' | 'error'
type Agent = 'cosmo' | 'lusya'

interface VoiceEvent {
  event: VoiceState
  agent?: Agent
  text?: string
  timestamp: string
}

// Per-agent accent pair (inner core / outer halo). Минималистично, без имён.
const AGENT_COLORS: Record<Agent, { core: string; halo: string }> = {
  cosmo: { core: '#a5b4fc', halo: '#7c3aed' },
  lusya: { core: '#fbcfe8', halo: '#ec4899' },
}

const STATUS_LABEL: Record<Exclude<VoiceState, 'idle'>, string> = {
  wake: 'слушаю',
  command: '',
  response: '',
  error: '',
}

export default function VoiceOverlay() {
  const [state, setState] = useState<VoiceState>('idle')
  const [agent, setAgent] = useState<Agent>('cosmo')
  const [text, setText] = useState('')

  const dismissTimer = useRef<ReturnType<typeof setTimeout> | null>(null)
  const audioRef = useRef<HTMLAudioElement | null>(null)
  const audioUrlRef = useRef<string | null>(null)

  const clearDismiss = () => {
    if (dismissTimer.current) {
      clearTimeout(dismissTimer.current)
      dismissTimer.current = null
    }
  }
  const scheduleDismiss = (ms: number) => {
    clearDismiss()
    dismissTimer.current = setTimeout(() => setState('idle'), ms)
  }

  const stopAudio = () => {
    if (audioRef.current) {
      try {
        audioRef.current.pause()
        audioRef.current.src = ''
      } catch {}
      audioRef.current = null
    }
    if (audioUrlRef.current) {
      URL.revokeObjectURL(audioUrlRef.current)
      audioUrlRef.current = null
    }
  }

  const playTTS = async (textToSpeak: string, agentId: Agent) => {
    stopAudio()
    if (!textToSpeak) return
    try {
      const r = await fetch('/api/voice/tts', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ text: textToSpeak, agent: agentId }),
      })
      if (!r.ok) return
      const blob = await r.blob()
      const url = URL.createObjectURL(blob)
      audioUrlRef.current = url
      const audio = new Audio(url)
      audio.onended = () => {
        if (audioUrlRef.current === url) {
          URL.revokeObjectURL(url)
          audioUrlRef.current = null
        }
      }
      audioRef.current = audio
      await audio.play().catch(() => {})
    } catch {}
  }

  useEffect(() => {
    let es: EventSource | null = null
    let retry: ReturnType<typeof setTimeout> | null = null
    let closedByUs = false

    const connect = () => {
      es = new EventSource('/api/voice/stream')

      es.onmessage = (e) => {
        try {
          const evt: VoiceEvent = JSON.parse(e.data)
          const currentAgent: Agent = evt.agent ?? agent
          if (evt.agent) setAgent(evt.agent)

          if (evt.event === 'wake') {
            stopAudio()
            setState('wake')
            setText('')
            scheduleDismiss(20000)
          } else if (evt.event === 'command') {
            setState('command')
            setText(evt.text || '')
            scheduleDismiss(30000)
          } else if (evt.event === 'response') {
            setState('response')
            setText(evt.text || '')
            if (evt.text) playTTS(evt.text, currentAgent)
            scheduleDismiss(Math.max(6000, (evt.text?.length || 0) * 80))
          } else if (evt.event === 'error') {
            setState('error')
            setText(evt.text || 'Ошибка')
            if (evt.text) playTTS(evt.text, currentAgent)
            scheduleDismiss(5000)
          } else if (evt.event === 'idle') {
            clearDismiss()
            setState('idle')
          }
        } catch {}
      }

      es.onerror = () => {
        if (closedByUs) return
        es?.close()
        retry = setTimeout(connect, 3000)
      }
    }

    connect()

    return () => {
      closedByUs = true
      clearDismiss()
      stopAudio()
      if (retry) clearTimeout(retry)
      es?.close()
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [])

  const isActive = state !== 'idle'
  const colors = AGENT_COLORS[agent]
  const status = state !== 'idle' ? STATUS_LABEL[state] : ''

  return (
    <AnimatePresence>
      {isActive && (
        <motion.div
          initial={{ opacity: 0 }}
          animate={{ opacity: 1 }}
          exit={{ opacity: 0 }}
          transition={{ duration: 0.35 }}
          style={{
            position: 'fixed', inset: 0, zIndex: 300,
            background: 'rgba(5, 5, 15, 0.82)',
            backdropFilter: 'blur(28px)',
            WebkitBackdropFilter: 'blur(28px)' as any,
            display: 'flex', flexDirection: 'column',
            alignItems: 'center', justifyContent: 'center',
            gap: 30, padding: 40,
            pointerEvents: 'none',
          }}
        >
          <SiriOrb core={colors.core} halo={colors.halo} state={state} />

          {/* Subtle status (только "слушаю" — для остальных текст сам говорит за себя) */}
          {status && (
            <motion.div
              key={state}
              initial={{ opacity: 0, y: -4 }}
              animate={{ opacity: 0.55, y: 0 }}
              transition={{ duration: 0.3 }}
              style={{
                fontSize: 13, color: 'rgba(255,255,255,0.6)',
                fontWeight: 600, letterSpacing: '0.15em',
                textTransform: 'uppercase',
              }}
            >
              {status}
            </motion.div>
          )}

          {/* Текст — распознанный / ответ */}
          {text && (
            <motion.div
              key={text.slice(0, 40)}
              initial={{ opacity: 0, y: 8 }}
              animate={{ opacity: 1, y: 0 }}
              transition={{ duration: 0.35 }}
              style={{
                maxWidth: 760, textAlign: 'center',
                fontSize: state === 'command' ? 20 : 24,
                fontWeight: 500,
                color: state === 'error' ? '#fca5a5' :
                       state === 'command' ? 'rgba(255,255,255,0.55)' :
                       'rgba(255,255,255,0.95)',
                letterSpacing: '-0.3px', lineHeight: 1.4,
              }}
            >
              {text}
            </motion.div>
          )}
        </motion.div>
      )}
    </AnimatePresence>
  )
}

function SiriOrb({ core, halo, state }: { core: string; halo: string; state: VoiceState }) {
  const isIntense = state === 'wake'
  const isResponding = state === 'response'

  return (
    <div style={{ position: 'relative', width: 240, height: 240 }}>
      {/* Outer halo — медленное дыхание */}
      <motion.div
        animate={{
          scale: isIntense ? [1, 1.2, 1] : [1, 1.08, 1],
          opacity: isIntense ? [0.55, 0.2, 0.55] : [0.35, 0.15, 0.35],
        }}
        transition={{
          duration: isIntense ? 1.6 : 3.2,
          repeat: Infinity,
          ease: 'easeInOut',
        }}
        style={{
          position: 'absolute', inset: 0, borderRadius: '50%',
          background: `radial-gradient(circle, ${halo}55 0%, transparent 72%)`,
          filter: 'blur(32px)',
        }}
      />
      {/* Inner ring — быстрее, с подкрученным blur */}
      <motion.div
        animate={{
          scale: isIntense ? [1, 1.1, 1] : isResponding ? [1, 1.04, 1] : 1,
          rotate: isIntense ? [0, 10, -8, 0] : 0,
        }}
        transition={{
          duration: 1.3,
          repeat: Infinity,
          ease: 'easeInOut',
        }}
        style={{
          position: 'absolute', inset: 40, borderRadius: '50%',
          background: `radial-gradient(circle at 40% 30%, ${core} 0%, ${halo} 60%, transparent 85%)`,
          filter: 'blur(16px)',
          boxShadow: `0 0 80px ${halo}66, 0 0 40px ${core}55`,
        }}
      />
      {/* Bright core — тонкий highlight */}
      <motion.div
        animate={{
          scale: isIntense ? [1, 0.85, 1] : 1,
          opacity: isIntense ? [0.9, 0.7, 0.9] : 0.85,
        }}
        transition={{ duration: 0.9, repeat: Infinity, ease: 'easeInOut' }}
        style={{
          position: 'absolute', inset: 90, borderRadius: '50%',
          background: `radial-gradient(circle at 45% 35%, rgba(255,255,255,0.9) 0%, ${core} 50%, transparent 100%)`,
          filter: 'blur(8px)',
        }}
      />
    </div>
  )
}