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

const TEAM_QUERY = gql`
  query Team($slug: String!) {
    team(slug: $slug) {
      id name iso2 slug fifaCode continent confederation
      stats { appearances wins draws losses goalsFor goalsAgainst goalDiff titles winPct }
    }
  }
`
const TEAM_MATCHES_QUERY = gql`
  query TeamMatches($teamId: Int!) {
    matches(teamId: $teamId, isQuali: false) {
      id year round group date isLive scoreFt scoreEt scoreP
      team1 { name iso2 slug } team2 { name iso2 slug }
    }
  }
`

interface TeamData {
  id: number; name: string; iso2?: string | null; slug: string
  fifaCode?: string | null; continent?: string | null; confederation?: string | null
  stats?: {
    appearances: number; wins: number; draws: number; losses: number
    goalsFor: number; goalsAgainst: number; goalDiff: number; titles: number; winPct: number
  } | null
}

interface MatchRow {
  id: number; year: number; round: string; group?: string | null
  date?: string | null; isLive: 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 }
}

function formatDate(d: string) {
  return new Date(d).toLocaleDateString('en-GB', { day: 'numeric', month: 'short' })
}

export default function TeamPage({ params }: { params: Promise<{ slug: string }> }) {
  const { slug } = use(params)
  const { data: teamData, loading } = useQuery(TEAM_QUERY, { variables: { slug } })
  const team: TeamData | null = teamData?.team ?? null

  useEffect(() => {
    document.title = team ? `${team.name} · World Cup` : 'Team · World Cup'
  }, [team])

  const { data: matchesData } = useQuery(TEAM_MATCHES_QUERY, {
    variables: { teamId: team?.id },
    skip: !team?.id,
  })

  const { data: scorerData } = useQuery(gql`
    query TeamScorers($teamId: Int!) {
      topScorers(teamId: $teamId, limit: 30) {
        playerName goals penalties ownGoals tournaments
        team { id name iso2 }
      }
    }
  `, { variables: { teamId: team?.id ?? 0 }, skip: !team?.id })

  const teamScorers = scorerData?.topScorers ?? []
  const teamMatches: MatchRow[] = matchesData?.matches ?? []

  // Group matches by year for the history display
  const matchesByYear = teamMatches.reduce((acc: Record<number, MatchRow[]>, m) => {
    ;(acc[m.year] ??= []).push(m)
    return acc
  }, {})
  const years = Object.keys(matchesByYear).map(Number).sort((a, b) => b - a)

  if (loading && !teamData) {
    return <div className="max-w-[1200px] mx-auto px-7 py-10 text-[#2a5c35]">Loading team…</div>
  }

  if (!team) {
    return <div className="max-w-[1200px] mx-auto px-7 py-10 text-[#2a5c35]">Team not found.</div>
  }

  const s = team.stats
  const played = (s?.wins ?? 0) + (s?.draws ?? 0) + (s?.losses ?? 0)
  const maxScorer = Math.max(...teamScorers.map((sc: { goals: number }) => sc.goals), 1)

  return (
    <div className="max-w-[1200px] mx-auto px-7 py-10 pb-16">
      {/* Hero */}
      <div className="pitch-grid rounded-2xl p-8 mb-8" style={{
        background: 'linear-gradient(145deg,#0a1a0e,#0d2416)',
        border: '1px solid rgba(34,197,94,0.2)',
      }}>
        <div className="flex items-center gap-6 flex-wrap">
          <TeamFlag name={team.name} iso2={team.iso2} size="xl" />
          <div>
            <h1 className="font-['Bebas_Neue'] text-[56px] text-[#22c55e] leading-none">{team.name}</h1>
            <div className="flex gap-3 mt-2 flex-wrap">
              {team.fifaCode && <span className="text-[11px] text-[#2a5c35] font-bold tracking-wider">{team.fifaCode}</span>}
              {team.confederation && <span className="text-[11px] text-[#2a5c35]">{team.confederation}</span>}
              {team.continent && <span className="text-[11px] text-[#2a5c35]">{team.continent}</span>}
              {(s?.titles ?? 0) > 0 && (
                <span className="text-[11px] text-[#22c55e] font-bold">
                  {Array.from({ length: s?.titles ?? 0 }).map(() => '🏆').join('')} {s?.titles} title{(s?.titles ?? 0) !== 1 ? 's' : ''}
                </span>
              )}
            </div>
          </div>
        </div>
      </div>

      <div className="grid grid-cols-1 lg:grid-cols-[1fr_260px] gap-8">
        <div>
          {/* Stats grid */}
          {s && (
            <div className="mb-8">
              <h2 className="text-[11px] text-[#2a5c35] font-bold tracking-[0.14em] uppercase mb-4">World Cup Record</h2>
              <div className="grid grid-cols-2 sm:grid-cols-4 gap-3 mb-3">
                {[
                  { label: 'Appearances', value: s.appearances },
                  { label: 'Matches', value: played },
                  { label: 'Win %', value: `${s.winPct}%` },
                  { label: 'Goals For', value: s.goalsFor },
                ].map(item => (
                  <div key={item.label} className="rounded-xl p-4" style={{ background: '#0a1810', border: '1px solid rgba(34,197,94,0.12)' }}>
                    <div className="text-[9px] text-[#2a5c35] tracking-[0.1em] uppercase mb-1.5">{item.label}</div>
                    <div className="font-['Bebas_Neue'] text-3xl text-[#22c55e]">{item.value}</div>
                  </div>
                ))}
              </div>
              <div className="rounded-xl overflow-hidden" style={{ background: '#0a1810', border: '1px solid rgba(34,197,94,0.12)' }}>
                <div className="grid px-4 py-2.5 text-[9px] text-[#2a5c35] tracking-[0.1em] uppercase"
                  style={{ gridTemplateColumns: '1fr 44px 44px 44px 60px 60px 60px' }}>
                  <span>Team</span><span className="text-center">W</span><span className="text-center">D</span>
                  <span className="text-center">L</span><span className="text-center">GF</span>
                  <span className="text-center">GA</span><span className="text-center">GD</span>
                </div>
                <div className="grid px-4 py-3 border-t items-center"
                  style={{ gridTemplateColumns: '1fr 44px 44px 44px 60px 60px 60px', borderColor: 'rgba(34,197,94,0.06)' }}>
                  <div className="flex items-center gap-2">
                    <TeamFlag name={team.name} iso2={team.iso2} size="sm" />
                    <span className="text-sm text-[#dff5e8]">{team.name}</span>
                  </div>
                  {[s.wins, s.draws, s.losses, s.goalsFor, s.goalsAgainst].map((v, i) => (
                    <span key={i} className="text-center text-sm text-[#4a7a55]">{v}</span>
                  ))}
                  <span className="text-center text-sm text-[#4a7a55]">{s.goalDiff >= 0 ? `+${s.goalDiff}` : s.goalDiff}</span>
                </div>
              </div>
            </div>
          )}

          {/* Tournament participations */}
          {years.length > 0 && (
            <div className="mb-8">
              <h2 className="text-[11px] text-[#2a5c35] font-bold tracking-[0.14em] uppercase mb-4">Tournament Participations</h2>
              <div className="flex flex-wrap gap-2">
                {years.map(year => (
                  <Link key={year} href={`/tournaments/${year}`}
                    className="font-['Bebas_Neue'] text-lg px-3 py-1 rounded-lg transition-colors hover:text-[#22c55e] hover:border-[rgba(34,197,94,0.4)]"
                    style={{ background: '#0a1810', border: '1px solid rgba(34,197,94,0.15)', color: '#6abf7a' }}>
                    {year}
                  </Link>
                ))}
              </div>
            </div>
          )}

          {/* Match history by year */}
          {years.length > 0 && (
            <div>
              <h2 className="text-[11px] text-[#2a5c35] font-bold tracking-[0.14em] uppercase mb-4">Match History</h2>
              <div className="space-y-6">
                {years.map(year => {
                  const yMatches = matchesByYear[year]
                  return (
                    <div key={year}>
                      <Link href={`/tournaments/${year}`}
                        className="inline-block font-['Bebas_Neue'] text-[22px] text-[#22c55e] mb-2 hover:opacity-70 transition-opacity">
                        {year}
                      </Link>
                      <div className="rounded-xl overflow-hidden" style={{ background: '#0a1810', border: '1px solid rgba(34,197,94,0.12)' }}>
                        {yMatches.map((m, i) => {
                          const isHome = m.team1.name === team.name
                          const opponent = isHome ? m.team2 : m.team1
                          const ft = m.scoreFt
                          const scoreEt = m.scoreEt
                          const scoreP = m.scoreP
                          // Winner: PSO first, then ET, then FT
                          const decisive = scoreP ?? scoreEt ?? ft
                          const myScore = decisive ? (isHome ? decisive[0] : decisive[1]) : null
                          const theirScore = decisive ? (isHome ? decisive[1] : decisive[0]) : null
                          const result = myScore != null && theirScore != null
                            ? myScore > theirScore ? 'W' : myScore < theirScore ? 'L' : 'D'
                            : null
                          const resultColor = result === 'W' ? 'text-[#22c55e]' : result === 'L' ? 'text-[#ef4444]' : 'text-[#6abf7a]'
                          // Display the decisive score (ET score for AET matches, FT for normal, PSO for shootouts)
                          const displayScore = scoreP ? null : (scoreEt ?? ft)
                          return (
                            <Link key={m.id} href={`/tournaments/${m.year}#match-${m.id}`}>
                              <div className="flex items-center gap-3 px-3 sm:px-4 py-2.5 border-b hover:bg-[rgba(34,197,94,0.03)] transition-colors"
                                style={{ borderColor: 'rgba(34,197,94,0.06)', background: i % 2 === 0 ? undefined : 'rgba(34,197,94,0.01)' }}>
                                <span className={`text-[11px] font-bold w-4 flex-shrink-0 ${resultColor}`}>{result ?? '–'}</span>
                                <TeamFlag name={opponent.name} iso2={opponent.iso2} size="sm" />
                                <div className="flex-1 min-w-0">
                                  <div className="text-sm text-[#dff5e8] truncate">{opponent.name}</div>
                                  <div className="text-[10px] text-[#2a5c35]">
                                    {m.round}{m.group ? ` · ${m.group}` : ''}{m.date ? ` · ${formatDate(m.date)}` : ''}
                                  </div>
                                </div>
                                <div className="text-right flex-shrink-0">
                                  <div className="font-['Bebas_Neue'] text-lg text-[#22c55e] leading-none">
                                    {scoreP
                                      ? `${isHome ? scoreP[0] : scoreP[1]}–${isHome ? scoreP[1] : scoreP[0]}`
                                      : displayScore
                                        ? `${isHome ? displayScore[0] : displayScore[1]}–${isHome ? displayScore[1] : displayScore[0]}`
                                        : '–'}
                                  </div>
                                  {scoreP && ft && (
                                    <div className="text-[9px] text-[#2a5c35] leading-none">
                                      {`${isHome ? ft[0] : ft[1]}–${isHome ? ft[1] : ft[0]}`} a.e.t.
                                    </div>
                                  )}
                                  {scoreEt && !scoreP && (
                                    <div className="text-[9px] text-[#2a5c35] leading-none">a.e.t.</div>
                                  )}
                                </div>
                              </div>
                            </Link>
                          )
                        })}
                      </div>
                    </div>
                  )
                })}
              </div>
            </div>
          )}
        </div>

        {/* Sidebar: top scorers */}
        <div>
          {teamScorers.length > 0 && (
            <div>
              <h2 className="text-[11px] text-[#2a5c35] font-bold tracking-[0.14em] uppercase mb-4">Top Scorers</h2>
              <div className="rounded-2xl overflow-hidden" style={{ background: '#0a1810', border: '1px solid rgba(34,197,94,0.15)' }}>
                {teamScorers.map((sc: { playerName: string; goals: number; penalties: number; tournaments: number }, i: number) => (
                  <Link key={sc.playerName} href={`/players/${encodeURIComponent(sc.playerName)}`}>
                    <div className="flex items-center gap-2.5 px-3.5 py-2.5 border-b hover:bg-[rgba(34,197,94,0.03)] cursor-pointer"
                      style={{ borderColor: 'rgba(34,197,94,0.06)', background: i === 0 ? 'rgba(34,197,94,0.04)' : undefined }}>
                      <span className="text-[10px] text-[#2a5c35] w-4 text-right font-bold flex-shrink-0">{i + 1}</span>
                      <div className="flex-1 min-w-0">
                        <div className="text-[13px] font-semibold text-[#dff5e8] truncate">{sc.playerName}</div>
                        <div className="text-[10px] text-[#2a5c35]">
                          {sc.tournaments} WC{sc.tournaments !== 1 ? 's' : ''}{sc.penalties > 0 ? ` · ${sc.penalties}P` : ''}
                        </div>
                      </div>
                      <div className="w-10 h-1 rounded-full flex-shrink-0" style={{ background: 'rgba(34,197,94,0.1)' }}>
                        <div className="h-full rounded-full bg-[#22c55e]" style={{ width: `${(sc.goals / maxScorer) * 100}%` }} />
                      </div>
                      <span className="font-['Bebas_Neue'] text-xl text-[#22c55e] flex-shrink-0">{sc.goals}</span>
                    </div>
                  </Link>
                ))}
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  )
}