'use client'
import { useEffect, useState } from 'react'
import { motion, AnimatePresence } from 'framer-motion'
import { AlarmClock, Plus, Timer as TimerIcon } from 'lucide-react'
import TimerModal, { type TimerModalProps } from './TimerModal'

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

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

export default function TimerHomeWidget() {
  const [timers, setTimers] = useState<Timer[]>([])
  const [, setTick] = useState(0)
  const [modal, setModal] = useState<TimerModalProps['mode']>(null)

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

  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()
    }
  }, [])

  useEffect(() => {
    const t = setInterval(() => setTick(x => x + 1), 500)
    return () => clearInterval(t)
  }, [])

  const now = Date.now()
  const active = timers
    .filter(t => new Date(t.endsAt).getTime() > now - 30_000)
    .sort((a, b) => new Date(a.endsAt).getTime() - new Date(b.endsAt).getTime())

  // Keep reference to the currently-open timer updated as it ticks down
  // (so modal shows fresh countdown without reopening)
  const modalTimer =
    modal?.type === 'control' ? active.find(t => t.id === modal.timer.id) || modal.timer : null
  const resolvedMode: TimerModalProps['mode'] = modal
    ? modal.type === 'create'
      ? modal
      : modalTimer
      ? { type: 'control', timer: modalTimer }
      : null // timer исчез (отменили / прозвенел >30с) — закроем
    : null

  useEffect(() => {
    // Если таймер пропал из active, автоматом закрыть модалку
    if (modal?.type === 'control' && !modalTimer) {
      setModal(null)
    }
  }, [modal, modalTimer])

  return (
    <>
      <div className="card" style={{
        padding: '18px 20px',
        display: 'flex', flexDirection: 'column', gap: 14,
      }}>
        <div style={{ display: 'flex', alignItems: 'center', gap: 8, justifyContent: 'space-between' }}>
          <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
            <TimerIcon size={13} color="var(--text-secondary)" />
            <span style={{
              fontSize: 10, color: 'var(--text-secondary)',
              textTransform: 'uppercase', letterSpacing: '0.1em', fontWeight: 700,
            }}>
              Таймеры
            </span>
            {active.length > 0 && (
              <span style={{
                fontSize: 10, color: 'var(--text-tertiary)',
                background: 'var(--surface-2)', padding: '2px 7px', borderRadius: 8,
                fontWeight: 700, fontVariantNumeric: 'tabular-nums',
              }}>
                {active.length}
              </span>
            )}
          </div>
          <button
            onClick={() => setModal({ type: 'create' })}
            aria-label="Новый таймер"
            style={{
              width: 32, height: 32, borderRadius: 10,
              background: 'color-mix(in srgb, #818cf8 12%, var(--surface-2))',
              border: '1px solid color-mix(in srgb, #818cf8 30%, var(--border-subtle))',
              color: '#a5b4fc',
              display: 'flex', alignItems: 'center', justifyContent: 'center',
              cursor: 'pointer',
            }}
          >
            <Plus size={15} />
          </button>
        </div>

        {active.length === 0 ? (
          <button
            onClick={() => setModal({ type: 'create' })}
            style={{
              flex: 1, display: 'flex', flexDirection: 'column',
              alignItems: 'center', justifyContent: 'center',
              padding: '28px 0 20px', gap: 10,
              color: 'var(--text-tertiary)',
              background: 'transparent', border: 'none', cursor: 'pointer',
            }}
          >
            <AlarmClock size={30} style={{ opacity: 0.4 }} />
            <div style={{ fontSize: 13 }}>Нет активных таймеров</div>
            <div style={{ fontSize: 11, opacity: 0.7, textAlign: 'center', lineHeight: 1.5 }}>
              Скажи «поставь таймер на 5 минут»<br />или нажми +
            </div>
          </button>
        ) : (
          <div style={{ display: 'flex', flexDirection: 'column', gap: 10 }}>
            <AnimatePresence mode="popLayout">
              {active.map(t => {
                const end = new Date(t.endsAt).getTime()
                const start = new Date(t.startedAt).getTime()
                const total = Math.max(1, end - start)
                const remain = Math.max(0, end - now)
                const progress = Math.max(0, Math.min(1, 1 - remain / total))
                const imminent = remain > 0 && remain < 10_000
                const expired = remain <= 0
                const time = formatRemaining(remain)

                const accent = expired ? '#f87171' : imminent ? '#fb923c' : '#818cf8'
                const accentBg = expired
                  ? 'linear-gradient(135deg, rgba(239,68,68,0.14), rgba(239,68,68,0.06))'
                  : imminent
                  ? 'linear-gradient(135deg, rgba(251,146,60,0.14), rgba(251,146,60,0.06))'
                  : 'var(--surface-2)'

                return (
                  <motion.button
                    key={t.id}
                    layout
                    initial={{ opacity: 0, y: 8 }}
                    animate={{ opacity: 1, y: 0 }}
                    exit={{ opacity: 0, x: 40 }}
                    transition={{ duration: 0.25 }}
                    onClick={() => setModal({ type: 'control', timer: t })}
                    style={{
                      position: 'relative', overflow: 'hidden',
                      padding: '16px 18px', borderRadius: 16,
                      background: accentBg,
                      border: `1px solid ${expired || imminent ? accent + '55' : 'var(--border-subtle)'}`,
                      display: 'flex', alignItems: 'center', gap: 14,
                      cursor: 'pointer', textAlign: 'left',
                      minHeight: 68,
                      width: '100%',
                    }}
                  >
                    <div style={{
                      position: 'absolute', bottom: 0, left: 0,
                      height: 3, width: `${progress * 100}%`,
                      background: accent,
                      transition: 'width 0.5s linear',
                      opacity: expired ? 0.5 : 1,
                    }} />

                    {/* Big countdown */}
                    <div style={{ display: 'flex', alignItems: 'baseline', gap: 2, minWidth: 108 }}>
                      <div style={{
                        fontSize: 34, fontWeight: 800,
                        color: expired ? accent : 'var(--text-primary)',
                        letterSpacing: '-1.5px', lineHeight: 1,
                        fontVariantNumeric: 'tabular-nums',
                      }}>
                        {time.big}
                      </div>
                      {time.small && (
                        <div style={{
                          fontSize: 16, color: 'var(--text-secondary)',
                          fontWeight: 600, fontVariantNumeric: 'tabular-nums',
                        }}>
                          :{time.small}
                        </div>
                      )}
                    </div>

                    {/* Label */}
                    <div style={{ flex: 1, minWidth: 0 }}>
                      <div style={{
                        fontSize: 14, fontWeight: 700,
                        color: 'var(--text-primary)',
                        overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap',
                      }}>
                        {t.label}
                      </div>
                      <div style={{
                        fontSize: 11, color: 'var(--text-tertiary)',
                        marginTop: 2,
                      }}>
                        {expired ? 'прозвенел — тап чтобы закрыть' : 'тап чтобы изменить'}
                      </div>
                    </div>
                  </motion.button>
                )
              })}
            </AnimatePresence>
          </div>
        )}
      </div>

      <TimerModal mode={resolvedMode} onClose={() => setModal(null)} />
    </>
  )
}
