'use client'
import { useQuery, gql } from '@/lib/graphql/hooks'
import { useEffect } from 'react'
import Link from 'next/link'
import { TeamFlag } from '@/components/team-flag'
import { LiveBadge } from '@/components/live-badge'
import { MatchCard } from '@/components/match-card'

const HOME_QUERY = gql`
  query Home {
    tournamentStats { totalTournaments totalMatches totalGoals avgGoalsPerGame }
    liveMatches {
      id year round group date time isLive scoreFt scoreEt scoreP isQualiPlayoff
      team1 { name iso2 slug } team2 { name iso2 slug }
    }
    recentMatches(limit: 9) {
      id year round group date time isLive isQualiPlayoff scoreFt scoreEt scoreP
      team1 { name iso2 slug } team2 { name iso2 slug }
    }
    upcomingMatches(limit: 9) {
      id year round group date time isLive isQualiPlayoff scoreFt
      team1 { name iso2 slug } team2 { name iso2 slug }
    }
    topScorers(year: 2026, limit: 8) {
      playerName goals penalties ownGoals
      team { name iso2 }
    }
    tournament(year: 2026) { year totalGoals matchesCount avgGoalsPerGame }
  }
`

function SectionHeader({ label }: { label: string }) {
  return (
    <div className="flex items-center gap-2.5 mb-4">
      <div className="w-[3px] h-[18px] bg-green rounded-sm" />
      <span className="text-[11px] text-green-muted font-bold tracking-[0.12em] uppercase">{label}</span>
    </div>
  )
}

function StatPill({ label, value }: { label: string; value: string | number }) {
  return (
    <div className="flex-1 min-w-[90px] rounded-xl p-3.5 px-5 bg-green/5 border border-green/[12%]">
      <div className="text-[9px] text-green-muted tracking-[0.13em] uppercase mb-1.5 whitespace-nowrap">{label}</div>
      <div className="font-['Bebas_Neue'] text-[30px] text-green leading-none">{value ?? '–'}</div>
    </div>
  )
}

interface UpcomingMatch {
  id: number; year: number; time?: string | null; date?: string | null
  team1: { name: string; iso2?: string | null }
  team2: { name: string; iso2?: string | null }
}

function formatKickoff(date: string | null | undefined, time: string | null | undefined): string {
  if (!date) return ''
  const today = new Date()
  const tomorrow = new Date(today); tomorrow.setDate(today.getDate() + 1)

  if (time) {
    const m = time.match(/^(\d{2}):(\d{2})(?:\s+UTC([+-]\d+(?:\.\d+)?))?/)
    if (m) {
      const [y, mo, d] = date.split('-').map(Number)
      const h = parseInt(m[1]), min = parseInt(m[2])
      const offsetH = m[3] ? parseFloat(m[3]) : 0
      // Compute UTC kickoff, then let the browser render in its local timezone
      const local = new Date(Date.UTC(y, mo - 1, d, h - offsetH, min))
      const isToday = local.toDateString() === today.toDateString()
      const isTomorrow = local.toDateString() === tomorrow.toDateString()
      const dayLabel = isToday ? 'Today' : isTomorrow ? 'Tomorrow'
        : local.toLocaleDateString('en-GB', { weekday: 'short', day: 'numeric', month: 'short' })
      const localTime = local.toLocaleTimeString('en-GB', { hour: '2-digit', minute: '2-digit' })
      return `${dayLabel} · ${localTime}`
    }
  }

  // No time — fall back to venue date label only
  const matchDate = new Date(date + 'T00:00:00')
  const isToday = matchDate.toDateString() === today.toDateString()
  const isTomorrow = matchDate.toDateString() === tomorrow.toDateString()
  return isToday ? 'Today' : isTomorrow ? 'Tomorrow'
    : matchDate.toLocaleDateString('en-GB', { weekday: 'short', day: 'numeric', month: 'short' })
}

function UpcomingFixture({ match }: { match: UpcomingMatch }) {
  const label = formatKickoff(match.date, match.time)
  return (
    <Link href={`/tournaments/${match.year}#match-${match.id}`}>
      <div className="glass-card rounded-[10px] p-3 px-4 flex items-center gap-2.5 hover:border-green/20 transition-colors cursor-pointer">
        <TeamFlag name={match.team1.name} iso2={match.team1.iso2} size="sm" />
        <div className="flex-1 text-[13px] text-green-sec font-medium truncate">
          {match.team1.name} <span className="text-green-muted">vs</span> {match.team2.name}
        </div>
        <TeamFlag name={match.team2.name} iso2={match.team2.iso2} size="sm" />
        {label && <div className="text-[11px] text-green-muted whitespace-nowrap ml-1">{label}</div>}
      </div>
    </Link>
  )
}

interface ScorerEntry {
  playerName: string; goals: number; penalties: number
  team?: { name: string; iso2?: string | null } | null
}

interface MatchData {
  id: number; year: number; round: string; group?: string | null
  date?: string | null; time?: string | null; isLive: boolean; isQualiPlayoff: boolean
  scoreFt?: number[] | null; scoreEt?: number[] | null; scoreP?: number[] | null
  team1: { name: string; iso2?: string | null; slug?: string | null }
  team2: { name: string; iso2?: string | null; slug?: string | null }
}

export default function HomePage() {
  const { data, loading } = useQuery(HOME_QUERY, { pollInterval: 60_000 })

  useEffect(() => { document.title = 'World Cup' }, [])

  const stats = data?.tournamentStats
  const live: MatchData[] = data?.liveMatches ?? []
  const recent: MatchData[] = data?.recentMatches ?? []
  const upcoming: UpcomingMatch[] = data?.upcomingMatches ?? []
  const scorers: ScorerEntry[] = data?.topScorers ?? []
  const wc2026 = data?.tournament

  const maxGoals = Math.max(...scorers.map(s => s.goals), 1)

  return (
    <div>
      {/* ── Hero ── */}
      <div className="pitch-grid border-b border-border" style={{
        background: 'linear-gradient(145deg,rgba(10,26,14,0.9) 0%,rgba(13,36,22,0.9) 55%,rgba(10,26,14,0.9) 100%)',
        padding: '52px 0 44px',
      }}>
        <div className="max-w-[1200px] mx-auto px-7">
          <div className="mb-4">
            {live.length > 0
              ? <LiveBadge label="Live · Group Stage in Progress" />
              : <div className="flex items-center gap-2">
                  <span className="w-2 h-2 rounded-full bg-green inline-block" />
                  <span className="text-[11px] font-bold text-green tracking-[0.14em] uppercase">World Cup 2026 · In Progress</span>
                </div>
            }
          </div>
          <h1 className="font-['Bebas_Neue'] text-[clamp(50px,9vw,100px)] tracking-[0.04em] text-white leading-[0.92] mb-2.5">
            World Cup 2026
          </h1>
          <p className="text-green-muted text-sm mb-9">
            USA · Canada · Mexico &nbsp;·&nbsp; 11 June – 19 July 2026 · 48 Teams
          </p>
          <div className="flex gap-2.5 flex-wrap max-w-[760px]">
            {stats ? <>
              <StatPill label="Tournaments" value={stats.totalTournaments} />
              <StatPill label="Matches" value={stats.totalMatches} />
              <StatPill label="Goals" value={stats.totalGoals} />
              <StatPill label="Goals/Game" value={stats.avgGoalsPerGame?.toFixed(2) ?? '–'} />
              {wc2026 && <>
                <StatPill label="2026 Goals" value={wc2026.totalGoals ?? 0} />
                <StatPill label="2026 Avg" value={wc2026.avgGoalsPerGame ? Number(wc2026.avgGoalsPerGame).toFixed(2) : '–'} />
              </>}
            </> : [1,2,3,4].map(i => (
              <div key={i} className="flex-1 min-w-[90px] h-20 rounded-xl animate-pulse bg-green/[4%]" />
            ))}
          </div>
        </div>
      </div>

      <div className="max-w-[1200px] mx-auto px-7">
        {/* Live matches */}
        {live.length > 0 && (
          <div className="pt-9">
            <SectionHeader label="Live Now" />
            <div className="grid gap-4">
              {live.map(m => <MatchCard key={m.id} match={m} />)}
            </div>
          </div>
        )}

        {/* Latest result */}
        {recent.length > 0 && (
          <div className="pt-9">
            <SectionHeader label="Latest Result" />
            <MatchCard match={recent[0]} />
          </div>
        )}

        {/* Recent grid */}
        {recent.length > 1 && (
          <div className="pt-8">
            <SectionHeader label="Recent Results" />
            <div className="grid grid-cols-[repeat(auto-fill,minmax(290px,1fr))] gap-2.5">
              {recent.slice(1).map(m => <MatchCard key={m.id} match={m} compact />)}
            </div>
          </div>
        )}

        {/* Upcoming */}
        {upcoming.length > 0 && (
          <div className="pt-8">
            <SectionHeader label="Upcoming Fixtures" />
            <div className="grid grid-cols-[repeat(auto-fill,minmax(280px,1fr))] gap-2">
              {upcoming.map(m => <UpcomingFixture key={m.id} match={m} />)}
            </div>
          </div>
        )}

        {/* Golden Boot 2026 */}
        {scorers.length > 0 && (
          <div className="pt-8 pb-16">
            <SectionHeader label="2026 Golden Boot Race" />
            <div className="glass-card">
              {scorers.map((s, i) => (
                <Link key={s.playerName} href={`/players/${encodeURIComponent(s.playerName)}`}>
                  <div className={`flex items-center gap-2 sm:gap-3 px-3 sm:px-4 py-3 border-b border-green/[6%] hover:bg-green/[3%] transition-colors cursor-pointer ${i === 0 ? 'bg-green/[4%]' : ''}`}>
                    <span className="text-[11px] text-green-muted w-5 text-right font-bold flex-shrink-0">{i + 1}</span>
                    {s.team && <TeamFlag name={s.team.name} iso2={s.team.iso2} size="sm" />}
                    <div className="flex-1 min-w-0">
                      <div className={`text-sm font-semibold truncate ${i === 0 ? 'text-text' : 'text-green-sec'}`}>{s.playerName}</div>
                      <div className="text-[10px] text-green-muted truncate">{s.team?.name}{s.penalties > 0 ? ` · ${s.penalties}P` : ''}</div>
                    </div>
                    <div className="hidden sm:block w-24 h-1 rounded-full overflow-hidden flex-shrink-0 bg-green/10">
                      <div className="h-full rounded-full bg-green transition-all" style={{ width: `${(s.goals / maxGoals) * 100}%` }} />
                    </div>
                    <span className="font-['Bebas_Neue'] text-[22px] text-green min-w-[24px] text-right flex-shrink-0">{s.goals}</span>
                  </div>
                </Link>
              ))}
            </div>
            <p className="text-[10px] text-green-dark mt-3 text-center">
              <Link href="/stats" className="hover:text-green-muted">View all-time top scorers →</Link>
            </p>
          </div>
        )}

        {loading && !data && (
          <div className="py-16 text-center text-green-muted text-sm">Loading live World Cup data…</div>
        )}
      </div>
    </div>
  )
}