import { useState } from 'react'
import { RefreshCw, CheckCircle2, XCircle, Clock, Globe, AlertTriangle } from 'lucide-react'
import { MOCK_CHANNELS } from '../data/mockData'
import type { Channel, SyncStatus } from '../types'
import { cn } from '../lib/utils'
import { Badge } from '../components/ui/Badge'

const CHANNEL_ICONS: Record<string, string> = {
  booking_com:    '🔵',
  airbnb:         '🔴',
  expedia:        '🟡',
  vrbo:           '🟢',
  yandex_travel:  '🔴',
  ostrovok:       '🟣',
  sutochno:       '🟠',
  onetwotrip:     '🔵',
}

const RUSSIAN_CHANNELS = new Set(['yandex_travel', 'ostrovok', 'sutochno', 'onetwotrip'])

function SyncStatusBadge({ status }: { status: SyncStatus }) {
  const map: Record<SyncStatus, { icon: React.ElementType; label: string; cls: string }> = {
    idle:    { icon: Clock,         label: 'Не настроен', cls: 'bg-slate-100 text-slate-600 dark:bg-slate-700 dark:text-slate-300' },
    syncing: { icon: RefreshCw,     label: 'Синхронизация', cls: 'bg-blue-100 text-blue-700 dark:bg-blue-900/30 dark:text-blue-300' },
    success: { icon: CheckCircle2,  label: 'Синхронизирован', cls: 'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-300' },
    error:   { icon: XCircle,       label: 'Ошибка', cls: 'bg-red-100 text-red-700 dark:bg-red-900/30 dark:text-red-300' },
  }
  const { icon: Icon, label, cls } = map[status]
  return (
    <Badge className={cn(cls, 'gap-1')}>
      <Icon size={10} className={status === 'syncing' ? 'animate-spin' : ''} />
      {label}
    </Badge>
  )
}

export function ChannelsPage() {
  const [channels, setChannels] = useState<Channel[]>(MOCK_CHANNELS)

  const triggerSync = (id: string) => {
    setChannels(prev => prev.map(c =>
      c.id === id ? { ...c, lastSyncStatus: 'syncing' } : c,
    ))
    setTimeout(() => {
      setChannels(prev => prev.map(c =>
        c.id === id
          ? { ...c, lastSyncStatus: 'success', lastSyncAt: new Date().toISOString(), bookingsImported: c.bookingsImported + Math.floor(Math.random() * 3) }
          : c,
      ))
    }, 2000)
  }

  const toggleChannel = (id: string) => {
    setChannels(prev => prev.map(c =>
      c.id === id ? { ...c, isEnabled: !c.isEnabled } : c,
    ))
  }

  const totalImported = channels.reduce((s, c) => s + c.bookingsImported, 0)
  const activeCount = channels.filter(c => c.isEnabled).length

  const internationalChannels = channels.filter(c => !RUSSIAN_CHANNELS.has(c.name))
  const russianChannels = channels.filter(c => RUSSIAN_CHANNELS.has(c.name))

  return (
    <div className="p-4 md:p-6 space-y-5">
      {/* Header */}
      <div>
        <h1 className="text-xl font-bold text-slate-900 dark:text-slate-100">Менеджер каналов</h1>
        <p className="text-sm text-slate-500 dark:text-slate-400">
          Синхронизация с OTA площадками
        </p>
      </div>

      {/* Stats */}
      <div className="grid grid-cols-2 md:grid-cols-4 gap-3">
        {[
          { label: 'Активных каналов', value: activeCount, icon: Globe },
          { label: 'Всего каналов', value: channels.length, icon: Globe },
          { label: 'Импортировано броней', value: totalImported, icon: CheckCircle2 },
          { label: 'Последняя синхронизация', value: 'Сегодня', icon: RefreshCw },
        ].map(s => (
          <div key={s.label} className="card p-4">
            <p className="text-2xl font-bold text-slate-900 dark:text-slate-100">{s.value}</p>
            <p className="text-sm text-slate-500 dark:text-slate-400">{s.label}</p>
          </div>
        ))}
      </div>

      {/* International Channels */}
      <div>
        <h2 className="text-base font-semibold text-slate-700 dark:text-slate-300 mb-3">
          🌍 Международные площадки
        </h2>
        <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
          {internationalChannels.map(channel => (
            <ChannelCard
              key={channel.id}
              channel={channel}
              onSync={() => triggerSync(channel.id)}
              onToggle={() => toggleChannel(channel.id)}
            />
          ))}
        </div>
      </div>

      {/* Russian Channels */}
      <div>
        <h2 className="text-base font-semibold text-slate-700 dark:text-slate-300 mb-3">
          🇷🇺 Российские площадки
        </h2>
        <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
          {russianChannels.map(channel => (
            <ChannelCard
              key={channel.id}
              channel={channel}
              onSync={() => triggerSync(channel.id)}
              onToggle={() => toggleChannel(channel.id)}
            />
          ))}
        </div>
      </div>

      {/* Info */}
      <div className="card p-4 border-amber-200 dark:border-amber-800/50 bg-amber-50 dark:bg-amber-900/10">
        <div className="flex gap-3">
          <AlertTriangle size={18} className="text-amber-600 dark:text-amber-400 shrink-0 mt-0.5" />
          <div>
            <p className="font-medium text-amber-800 dark:text-amber-300">Демо-режим</p>
            <p className="text-sm text-amber-700 dark:text-amber-400 mt-0.5">
              В демо-режиме синхронизация имитируется. В продакшн-версии используется webhook-интеграция
              с реальными API каналов через менеджер каналов (Staah, SiteMinder, HotelRunner и др.)
            </p>
          </div>
        </div>
      </div>
    </div>
  )
}

function ChannelCard({ channel, onSync, onToggle }: {
  channel: Channel
  onSync: () => void
  onToggle: () => void
}) {
  const isSyncing = channel.lastSyncStatus === 'syncing'

  return (
    <div className={cn('card p-5 transition-all', !channel.isEnabled && 'opacity-60')}>
      <div className="flex items-start justify-between mb-4">
        <div className="flex items-center gap-3">
          <div className="w-11 h-11 rounded-xl bg-slate-100 dark:bg-slate-700 flex items-center justify-center text-2xl">
            {CHANNEL_ICONS[channel.name]}
          </div>
          <div>
            <p className="font-semibold text-slate-900 dark:text-slate-100">{channel.displayName}</p>
            <SyncStatusBadge status={channel.lastSyncStatus} />
          </div>
        </div>

        {/* Toggle */}
        <button
          onClick={onToggle}
          className={cn(
            'relative w-11 h-6 rounded-full transition-colors',
            channel.isEnabled ? 'bg-brand-600' : 'bg-slate-300 dark:bg-slate-600',
          )}
        >
          <div className={cn(
            'absolute top-0.5 w-5 h-5 rounded-full bg-white shadow-sm transition-transform',
            channel.isEnabled ? 'left-[22px]' : 'left-0.5',
          )} />
        </button>
      </div>

      {channel.isEnabled && (
        <div className="space-y-2.5">
          <div className="grid grid-cols-2 gap-3 text-sm">
            <div>
              <p className="text-xs text-slate-500 dark:text-slate-400">Импортировано броней</p>
              <p className="font-semibold text-slate-900 dark:text-slate-100">{channel.bookingsImported}</p>
            </div>
            <div>
              <p className="text-xs text-slate-500 dark:text-slate-400">Последняя синхронизация</p>
              <p className="font-semibold text-slate-900 dark:text-slate-100">
                {channel.lastSyncAt
                  ? new Intl.DateTimeFormat('ru-RU', { hour: '2-digit', minute: '2-digit' }).format(new Date(channel.lastSyncAt))
                  : '—'
                }
              </p>
            </div>
          </div>

          {channel.mappings.length > 0 && (
            <div>
              <p className="text-xs text-slate-500 dark:text-slate-400 mb-1.5">Маппинг номеров ({channel.mappings.length})</p>
              <div className="space-y-1">
                {channel.mappings.slice(0, 2).map(m => (
                  <div key={m.localRoomId} className="flex items-center justify-between text-xs">
                    <span className="text-slate-600 dark:text-slate-400">№{
                      m.localRoomId.replace('r', '')
                    }</span>
                    <span className="text-slate-400">→</span>
                    <span className="text-slate-600 dark:text-slate-400 truncate max-w-32">{m.channelRoomName}</span>
                  </div>
                ))}
                {channel.mappings.length > 2 && (
                  <p className="text-xs text-slate-400">+{channel.mappings.length - 2} ещё</p>
                )}
              </div>
            </div>
          )}

          <button
            onClick={onSync}
            disabled={isSyncing}
            className="w-full btn-secondary text-xs py-2 justify-center gap-2"
          >
            <RefreshCw size={13} className={isSyncing ? 'animate-spin' : ''} />
            {isSyncing ? 'Синхронизация...' : 'Синхронизировать сейчас'}
          </button>
        </div>
      )}

      {!channel.isEnabled && (
        <p className="text-sm text-slate-500 dark:text-slate-400 text-center py-2">
          Канал отключён. Включите для настройки интеграции.
        </p>
      )}
    </div>
  )
}