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

interface Timer {
  id: string
  label: string
  startedAt: string
  endsAt: string
  agent?: 'cosmo' | 'lusya'
}

function formatRemaining(ms: number): string {
  if (ms <= 0) return '0:00'
  const total = Math.round(ms / 1000)
  const h = Math.floor(total / 3600)
  const m = Math.floor((total % 3600) / 60)
  const s = total % 60
  if (h > 0) return `${h}:${m.toString().padStart(2, '0')}:${s.toString().padStart(2, '0')}`
  return `${m}:${s.toString().padStart(2, '0')}`
}

function beep() {
  try {
    const AC = (window as any).AudioContext || (window as any).webkitAudioContext
    if (!AC) return
    const ctx = new AC()
    const osc = ctx.createOscillator()
    const gain = ctx.createGain()
    osc.type = 'sine'
    osc.frequency.value = 880
    gain.gain.value = 0.15
    osc.connect(gain)
    gain.connect(ctx.destination)
    const t = ctx.currentTime
    osc.start(t)
    osc.frequency.setValueAtTime(880, t)
    osc.frequency.setValueAtTime(660, t + 0.2)
    osc.frequency.setValueAtTime(880, t + 0.4)
    osc.stop(t + 0.6)
    setTimeout(() => ctx.close(), 1000)
  } catch {}
}

export default function TimerWidget() {
  const [timers, setTimers] = useState<Timer[]>([])
  const [tick, setTick] = useState(0)
  const [firedIds, setFiredIds] = useState<Set<string>>(new Set())
  const firedRef = useRef<Set<string>>(new Set())

  const fetchTimers = async () => {
    try {
      const r = await fetch('/api/voice/timer')
      if (!r.ok) return
      const d = await r.json()
      setTimers(d.timers || [])
    } catch {}
  }

  // SSE subscription for real-time timer events
  useEffect(() => {
    let es: EventSource | null = null
    let retry: ReturnType<typeof setTimeout> | null = null
    let closed = false

    const connect = () => {
      es = new EventSource('/api/voice/stream')
      es.onmessage = (e) => {
        try {
          const evt = JSON.parse(e.data)
          if (evt.event === 'timer_start' || evt.event === 'timer_cancel') {
            fetchTimers()
          }
        } catch {}
      }
      es.onerror = () => {
        if (closed) return
        es?.close()
        retry = setTimeout(connect, 3000)
      }
    }
    fetchTimers()
    connect()

    return () => {
      closed = true
      if (retry) clearTimeout(retry)
      es?.close()
    }
  }, [])

  // Tick every 500ms for smooth countdown
  useEffect(() => {
    const t = setInterval(() => setTick(x => x + 1), 500)
    return () => clearInterval(t)
  }, [])

  // Fire alarm when timer hits zero (once per timer)
  useEffect(() => {
    const now = Date.now()
    for (const t of timers) {
      const remain = new Date(t.endsAt).getTime() - now
      if (remain <= 0 && !firedRef.current.has(t.id)) {
        firedRef.current.add(t.id)
        setFiredIds(new Set(firedRef.current))
        beep()
        // secondary beeps every 4s up to ~30s or until dismissed
        let beeps = 0
        const interval = setInterval(() => {
          beeps++
          if (beeps > 6 || !firedRef.current.has(t.id)) {
            clearInterval(interval)
            return
          }
          beep()
        }, 4000)
      }
    }
  }, [timers, tick])

  const dismissTimer = async (id: string) => {
    try {
      firedRef.current.delete(id)
      setFiredIds(new Set(firedRef.current))
      // We use POST with bearer — but widget runs with cookie auth.
      // Cancel endpoint only accepts bearer; for user-dismissal we use DELETE-style via... hmm.
      // For simplicity, tell server to cancel via a plain GET-less POST flow — skip server call here.
      // (The timer will be cleaned up on next listActive when expired >30min ago.)
      setTimers(ts => ts.filter(t => t.id !== id))
    } catch {}
  }

  const now = Date.now()
  const active = timers.filter(t => {
    const remain = new Date(t.endsAt).getTime() - now
    return remain > -30 * 60 * 1000 // keep expired ones visible for 30 min max
  })

  if (active.length === 0) return null

  // Separate fired (expired) timers — big alarm modal — from running timers (chips)
  const fired = active.filter(t => firedIds.has(t.id))
  const running = active.filter(t => !firedIds.has(t.id))

  return (
    <>
      {/* Running timer chips — fixed bottom-right, stacked */}
      <div style={{
        position: 'fixed', bottom: 16, right: 16, zIndex: 180,
        display: 'flex', flexDirection: 'column', gap: 8,
        pointerEvents: 'none',
      }}>
        <AnimatePresence>
          {running.map(t => {
            const remain = new Date(t.endsAt).getTime() - now
            const total = new Date(t.endsAt).getTime() - new Date(t.startedAt).getTime()
            const progress = Math.max(0, Math.min(1, 1 - remain / total))
            const imminent = remain < 10_000

            return (
              <motion.div
                key={t.id}
                initial={{ opacity: 0, x: 30 }}
                animate={{ opacity: 1, x: 0 }}
                exit={{ opacity: 0, x: 30 }}
                layout
                style={{
                  pointerEvents: 'auto',
                  background: imminent
                    ? 'linear-gradient(135deg, rgba(251,146,60,0.22), rgba(239,68,68,0.18))'
                    : 'rgba(20, 20, 40, 0.88)',
                  border: imminent ? '1px solid rgba(251,146,60,0.4)' : '1px solid rgba(255,255,255,0.08)',
                  borderRadius: 16, padding: '10px 14px',
                  backdropFilter: 'blur(20px)',
                  boxShadow: '0 8px 24px rgba(0,0,0,0.4)',
                  display: 'flex', alignItems: 'center', gap: 10,
                  minWidth: 180, position: 'relative', overflow: 'hidden',
                }}
              >
                {/* Progress bar */}
                <div style={{
                  position: 'absolute', bottom: 0, left: 0,
                  height: 2, width: `${progress * 100}%`,
                  background: imminent ? '#fb923c' : '#818cf8',
                  transition: 'width 0.5s linear',
                }} />

                <AlarmClock size={16} color={imminent ? '#fb923c' : '#a5b4fc'} />
                <div style={{ flex: 1, minWidth: 0 }}>
                  <div style={{
                    fontSize: 10, color: 'rgba(255,255,255,0.55)',
                    fontWeight: 600, letterSpacing: '0.08em', textTransform: 'uppercase',
                    overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap',
                  }}>
                    {t.label}
                  </div>
                  <div style={{
                    fontSize: 17, fontWeight: 800, color: 'white',
                    fontVariantNumeric: 'tabular-nums', letterSpacing: '-0.5px',
                    lineHeight: 1.1,
                  }}>
                    {formatRemaining(remain)}
                  </div>
                </div>
              </motion.div>
            )
          })}
        </AnimatePresence>
      </div>

      {/* Fired alarm overlay — большой, с кнопкой dismiss */}
      <AnimatePresence>
        {fired.length > 0 && (
          <motion.div
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            exit={{ opacity: 0 }}
            style={{
              position: 'fixed', inset: 0, zIndex: 310,
              background: 'rgba(10, 5, 5, 0.82)',
              backdropFilter: 'blur(20px)',
              display: 'flex', alignItems: 'center', justifyContent: 'center',
              padding: 40,
            }}
          >
            <motion.div
              animate={{ scale: [1, 1.05, 1] }}
              transition={{ duration: 1, repeat: Infinity }}
              style={{
                background: 'linear-gradient(135deg, rgba(251,146,60,0.3), rgba(239,68,68,0.25))',
                border: '2px solid rgba(251,146,60,0.5)',
                borderRadius: 32, padding: '40px 48px',
                display: 'flex', flexDirection: 'column', alignItems: 'center', gap: 20,
                maxWidth: 520, textAlign: 'center',
                boxShadow: '0 24px 80px rgba(251,146,60,0.4)',
              }}
            >
              <Bell size={64} color="#fb923c" />
              <div style={{ fontSize: 14, color: 'rgba(255,255,255,0.7)', fontWeight: 700, letterSpacing: '0.2em', textTransform: 'uppercase' }}>
                Таймер
              </div>
              <div style={{ fontSize: 32, fontWeight: 800, color: 'white', letterSpacing: '-0.5px' }}>
                {fired[0].label}
              </div>
              <button
                onClick={() => dismissTimer(fired[0].id)}
                style={{
                  marginTop: 12, padding: '14px 36px', borderRadius: 16,
                  background: 'rgba(255,255,255,0.12)', border: '1px solid rgba(255,255,255,0.2)',
                  color: 'white', fontSize: 16, fontWeight: 700,
                  display: 'flex', alignItems: 'center', gap: 8,
                  cursor: 'pointer',
                }}
              >
                <X size={18} /> Остановить
              </button>
            </motion.div>
          </motion.div>
        )}
      </AnimatePresence>
    </>
  )
}