import { useCalendar, useGeoNews } from '../hooks/useApi'
import clsx from 'clsx'
import { Calendar, Clock, Globe, AlertTriangle } from 'lucide-react'
import type { EconomicEvent, AssetClass } from '../types'
import { format, parseISO, isAfter, isBefore, addDays } from 'date-fns'
import { fr } from 'date-fns/locale'

const ASSET_EMOJIS: Record<string, string> = {
  energy: '⛽', metals: '🥇', agriculture: '🌾', equities: '📈',
  indices: '📊', forex: '💱', rates: '🏦',
}

const COUNTRY_FLAGS: Record<string, string> = {
  US: '🇺🇸', EU: '🇪🇺', CN: '🇨🇳', JP: '🇯🇵', GB: '🇬🇧',
  DE: '🇩🇪', FR: '🇫🇷', Global: '🌍',
}

const IMPORTANCE_CONFIG: Record<string, { color: string; label: string; dots: number }> = {
  high: { color: 'text-red-400 border-red-700/40', label: 'Majeur', dots: 3 },
  medium: { color: 'text-yellow-400 border-yellow-700/40', label: 'Modéré', dots: 2 },
  low: { color: 'text-slate-400 border-slate-700/40', label: 'Mineur', dots: 1 },
}

function EventCard({ ev }: { ev: EconomicEvent }) {
  const cfg = IMPORTANCE_CONFIG[ev.importance]
  const isPast = ev.actual !== undefined && ev.actual !== null
  const today = new Date()
  const evDate = parseISO(ev.date)
  const isToday = format(evDate, 'yyyy-MM-dd') === format(today, 'yyyy-MM-dd')
  const isSoon = !isToday && isAfter(evDate, today) && isBefore(evDate, addDays(today, 3))

  return (
    <div className={clsx('card hover:border-slate-600/50 transition-colors', {
      'border-yellow-500/40 bg-yellow-900/5': isToday,
      'border-blue-500/30': isSoon && !isToday,
      'opacity-60': isPast,
    })}>
      <div className="flex items-start justify-between gap-2">
        <div className="flex-1 min-w-0">
          <div className="flex items-center gap-2 mb-1">
            <span className="text-base">{COUNTRY_FLAGS[ev.country] ?? '🌍'}</span>
            <span className={clsx('text-xs font-bold uppercase tracking-wider', cfg.color.split(' ')[0])}>
              {'●'.repeat(cfg.dots)}
            </span>
            {isToday && <span className="badge badge-yellow text-xs">AUJOURD'HUI</span>}
            {isSoon && !isToday && <span className="badge badge-blue text-xs">BIENTÔT</span>}
          </div>
          <div className="text-sm text-white font-semibold">{ev.title}</div>
          <div className="text-xs text-slate-500 mt-0.5">
            {format(evDate, "EEEE d MMM yyyy", { locale: fr })} · {ev.country}
          </div>
        </div>
        <div className="text-right shrink-0">
          <div className={clsx('text-xs font-semibold', cfg.color.split(' ')[0])}>{cfg.label}</div>
          {ev.previous && <div className="text-xs text-slate-600 mt-0.5">Préc: {ev.previous}</div>}
          {ev.forecast && <div className="text-xs text-slate-500">Prév: {ev.forecast}</div>}
          {ev.actual && <div className="text-xs text-emerald-400 font-bold">Réel: {ev.actual}</div>}
        </div>
      </div>
      {ev.asset_impact && ev.asset_impact.length > 0 && (
        <div className="flex flex-wrap gap-1 mt-2">
          {ev.asset_impact.map(cls => (
            <span key={cls} className="text-xs bg-dark-700 text-slate-400 px-1.5 py-0.5 rounded border border-slate-700/40">
              {ASSET_EMOJIS[cls] ?? ''} {cls}
            </span>
          ))}
        </div>
      )}
    </div>
  )
}

export default function CalendarPage() {
  const { data: calendar, isLoading } = useCalendar()
  const { data: news } = useGeoNews()

  const today = new Date()
  const upcoming = calendar?.filter(ev => isAfter(parseISO(ev.date), today)) ?? []
  const past = calendar?.filter(ev => isBefore(parseISO(ev.date), today)) ?? []

  const highImpactNews = news?.filter(n => n.impact_score > 0.4).slice(0, 5) ?? []

  return (
    <div className="p-6 space-y-5">
      <div>
        <h1 className="text-xl font-bold text-white flex items-center gap-2">
          <Calendar className="w-5 h-5 text-blue-400" /> Calendrier Économique & Géopolitique
        </h1>
        <p className="text-xs text-slate-500 mt-0.5">
          Événements macro, catalyseurs géopolitiques, dates clés
        </p>
      </div>

      {/* Legend */}
      <div className="flex items-center gap-4 text-xs text-slate-500">
        <div className="flex items-center gap-1"><span className="text-red-400">●●●</span> Majeur (forte volatilité attendue)</div>
        <div className="flex items-center gap-1"><span className="text-yellow-400">●●</span> Modéré</div>
        <div className="flex items-center gap-1"><span className="text-slate-400">●</span> Mineur</div>
      </div>

      <div className="grid grid-cols-3 gap-5">
        {/* Economic calendar */}
        <div className="col-span-2 space-y-3">
          <div className="section-title flex items-center gap-1">
            <Clock className="w-3 h-3" /> Événements à venir ({upcoming.length})
          </div>
          {isLoading ? (
            [1,2,3].map(i => <div key={i} className="card animate-pulse h-20 bg-dark-700"></div>)
          ) : upcoming.length > 0 ? (
            upcoming.map((ev, i) => <EventCard key={i} ev={ev} />)
          ) : (
            <div className="card text-center py-8 text-slate-500 text-sm">
              Démarrer le backend pour charger le calendrier
            </div>
          )}

          {past.length > 0 && (
            <>
              <div className="section-title mt-6 flex items-center gap-1 opacity-60">
                Événements passés ({past.length})
              </div>
              {past.map((ev, i) => <EventCard key={i} ev={ev} />)}
            </>
          )}
        </div>

        {/* Right: geo alerts + timeline */}
        <div className="col-span-1 space-y-4">
          <div className="card">
            <div className="section-title flex items-center gap-1">
              <AlertTriangle className="w-3 h-3 text-orange-400" /> Alertes géopolitiques
            </div>
            {highImpactNews.length > 0 ? (
              <div className="space-y-2">
                {highImpactNews.map((n, i) => (
                  <div key={i} className="card-sm">
                    <div className="flex items-start justify-between gap-1">
                      <div className="text-xs text-white line-clamp-2">{n.title}</div>
                      <span className="text-xs text-orange-400 font-bold shrink-0 ml-1">
                        {Math.round(n.impact_score * 100)}
                      </span>
                    </div>
                    <div className="text-xs text-slate-600 mt-1">{n.source}</div>
                  </div>
                ))}
              </div>
            ) : (
              <div className="text-xs text-slate-600 text-center py-4">Charger les actualités géopolitiques</div>
            )}
          </div>

          {/* Trade opportunity windows */}
          <div className="card">
            <div className="section-title">Fenêtres d'opportunité</div>
            <div className="space-y-2 text-xs">
              {[
                { window: 'Pré-FOMC (-3j)', strategy: 'Straddle sur SPY', rationale: 'IV monte avant décision' },
                { window: 'Pré-NFP (-2j)', strategy: 'Straddle sur indices', rationale: 'Directional uncertainty' },
                { window: 'Post-OPEC', strategy: 'Bull Call Spread USO', rationale: 'Cut → oil spike probable' },
                { window: 'Pré-USDA Crop', strategy: 'Long Call WEAT', rationale: 'Supply news catalyst' },
                { window: 'Élections US approche', strategy: 'Long VIX Call', rationale: 'Vol expansion garantie' },
              ].map((op, i) => (
                <div key={i} className="card-sm">
                  <div className="font-semibold text-blue-400">{op.window}</div>
                  <div className="text-white mt-0.5">{op.strategy}</div>
                  <div className="text-slate-500">{op.rationale}</div>
                </div>
              ))}
            </div>
          </div>

          {/* Geo-event impact guide */}
          <div className="card">
            <div className="section-title flex items-center gap-1">
              <Globe className="w-3 h-3" /> Guide d'impact
            </div>
            <div className="space-y-1.5 text-xs">
              {[
                { event: 'Conflit Moyen-Orient', impact: 'Oil +10-20%', cls: 'energy' },
                { event: 'Sanctions Russie', impact: 'Gaz +15-40%', cls: 'energy' },
                { event: 'Tarifs US-Chine', impact: 'Soja -8%', cls: 'agriculture' },
                { event: 'Crise sanitaire', impact: 'Or +7-12%', cls: 'metals' },
                { event: 'Hausses Fed', impact: 'USD +2-4%', cls: 'forex' },
                { event: 'Guerre Ukraine', impact: 'Blé +15-50%', cls: 'agriculture' },
              ].map((g, i) => (
                <div key={i} className="flex justify-between items-center py-1 border-b border-slate-700/20 last:border-0">
                  <span className="text-slate-400">{g.event}</span>
                  <span className={clsx('font-bold', g.impact.includes('+') ? 'positive' : 'negative')}>
                    {g.impact}
                  </span>
                </div>
              ))}
            </div>
          </div>
        </div>
      </div>
    </div>
  )
}