import { db } from '@/lib/db'
import { tournaments, teams, matches, goals, groupStandings, stadiums, squads } from '@/lib/db/schema'
import { slugify, getIso } from '@/lib/iso-codes'
import { eq, and, desc, asc, sql, ilike, or, isNotNull, lt, lte, gt, gte } from 'drizzle-orm'

function teamWithSlug(t: typeof teams.$inferSelect) {
  return { ...t, slug: slugify(t.name), iso2: t.iso2 ?? getIso(t.name) }
}

async function getTeamById(id: number) {
  const rows = await db.select().from(teams).where(eq(teams.id, id)).limit(1)
  return rows[0] ? teamWithSlug(rows[0]) : null
}

function isLive(dateStr: string | null, timeStr: string | null): boolean {
  if (!dateStr) return false
  const now = new Date()
  if (now.toISOString().slice(0, 10) !== dateStr) return false
  if (!timeStr) return true
  // Parse "15:00 UTC-5" → convert to UTC kickoff time
  const m = timeStr.match(/^(\d{1,2}):(\d{2})(?:\s*UTC([+-]\d+(?:\.\d+)?))?/)
  if (!m) return true
  const localH = parseInt(m[1])
  const localMin = parseInt(m[2])
  const tzOffset = m[3] ? parseFloat(m[3]) : 0  // e.g. -5 for UTC-5
  // UTC = local time - tz offset  (15:00 UTC-5 → 15:00 - (-5h) = 20:00 UTC)
  const kickoff = new Date(`${dateStr}T00:00:00Z`)
  kickoff.setUTCMinutes(kickoff.getUTCMinutes() + localH * 60 + localMin - tzOffset * 60)
  const diffMin = (now.getTime() - kickoff.getTime()) / 60000
  return diffMin >= -5 && diffMin <= 125
}

async function hydrateMatch(row: typeof matches.$inferSelect) {
  const [t1, t2] = await Promise.all([getTeamById(row.team1Id), getTeamById(row.team2Id)])
  const matchGoals = await db.select().from(goals).where(eq(goals.matchId, row.id)).orderBy(asc(goals.minute))
  const goalsHydrated = await Promise.all(matchGoals.map(async g => ({
    ...g,
    team: (await getTeamById(g.teamId)) ?? { id: g.teamId, name: '', slug: '', iso2: null, fifaCode: null, continent: null, confederation: null },
    isPenalty: g.isPenalty ?? false,
    isOwnGoal: g.isOwnGoal ?? false,
    minuteOffset: g.minuteOffset ?? 0,
  })))
  const ft = row.scoreFtHome !== null ? [row.scoreFtHome, row.scoreFtAway!] : null
  const ht = row.scoreHtHome !== null ? [row.scoreHtHome, row.scoreHtAway!] : null
  const et = row.scoreEtHome !== null ? [row.scoreEtHome, row.scoreEtAway!] : null
  const p = row.scorePHome !== null ? [row.scorePHome, row.scorePAway!] : null
  const margin = ft ? Math.abs(ft[0] - ft[1]) : null
  const totalGoalsCount = ft ? ft[0] + ft[1] : null
  return {
    ...row,
    year: row.tournamentYear,
    group: row.groupName,
    time: row.timeLocal,
    stadium: null,
    team1: t1!, team2: t2!,
    scoreFt: ft, scoreHt: ht, scoreEt: et, scoreP: p,
    goals: goalsHydrated,
    isLive: isLive(row.date, row.timeLocal),
    isQualiPlayoff: row.isQualiPlayoff ?? false,
    margin, totalGoals: totalGoalsCount,
  }
}

function isMissingTable(e: unknown): boolean {
  const msg = e instanceof Error ? e.message : String(e)
  return msg.includes('relation') && msg.includes('does not exist')
}

export const resolvers = {
  Query: {
    async tournaments() {
      try {
        const rows = await db.select().from(tournaments).orderBy(desc(tournaments.year))
        return rows.map(r => ({ ...r, avgGoalsPerGame: r.avgGoalsPerGame ? parseFloat(r.avgGoalsPerGame) : null }))
      } catch (e) { if (isMissingTable(e)) return []; throw e }
    },
    async tournament(_: unknown, { year }: { year: number }) {
      try {
        const rows = await db.select().from(tournaments).where(eq(tournaments.year, year)).limit(1)
        if (!rows[0]) return null
        return { ...rows[0], avgGoalsPerGame: rows[0].avgGoalsPerGame ? parseFloat(rows[0].avgGoalsPerGame) : null }
      } catch (e) { if (isMissingTable(e)) return null; throw e }
    },
    async matches(_: unknown, args: { year?: number; group?: string; round?: string; isQuali?: boolean; teamId?: number }) {
      try {
        const conditions = []
        if (args.year) conditions.push(eq(matches.tournamentYear, args.year))
        if (args.group) conditions.push(eq(matches.groupName, args.group))
        if (args.round) conditions.push(eq(matches.round, args.round))
        if (args.isQuali != null) conditions.push(eq(matches.isQualiPlayoff, args.isQuali))
        if (args.teamId) conditions.push(or(eq(matches.team1Id, args.teamId), eq(matches.team2Id, args.teamId))!)
        const rows = await db.select().from(matches)
          .where(conditions.length > 0 ? and(...conditions) : undefined)
          .orderBy(asc(matches.date), asc(matches.id))
        return Promise.all(rows.map(hydrateMatch))
      } catch (e) { if (isMissingTable(e)) return []; throw e }
    },
    async match(_: unknown, { id }: { id: number }) {
      try {
        const rows = await db.select().from(matches).where(eq(matches.id, id)).limit(1)
        return rows[0] ? hydrateMatch(rows[0]) : null
      } catch (e) { if (isMissingTable(e)) return null; throw e }
    },
    async liveMatches() {
      try {
        const today = new Date().toISOString().slice(0, 10)
        const rows = await db.select().from(matches)
          .where(and(eq(matches.date, today), eq(matches.isQualiPlayoff, false)))
          .orderBy(asc(matches.id))
        const hydrated = await Promise.all(rows.map(hydrateMatch))
        return hydrated.filter(m => m.isLive)
      } catch (e) { if (isMissingTable(e)) return []; throw e }
    },
    async recentMatches(_: unknown, { limit = 10 }: { limit?: number }) {
      try {
        const today = new Date().toISOString().slice(0, 10)
        const rows = await db.select().from(matches)
          .where(and(
            lte(matches.date, today),
            isNotNull(matches.scoreFtHome),
            eq(matches.isQualiPlayoff, false),
          ))
          .orderBy(desc(matches.date), desc(matches.id))
          .limit(limit)
        return Promise.all(rows.map(hydrateMatch))
      } catch (e) { if (isMissingTable(e)) return []; throw e }
    },
    async upcomingMatches(_: unknown, { limit = 10 }: { limit?: number }) {
      try {
        const today = new Date().toISOString().slice(0, 10)
        const rows = await db.select().from(matches)
          .where(and(
            gte(matches.date, today),
            sql`${matches.scoreFtHome} IS NULL`,
            eq(matches.isQualiPlayoff, false),
          ))
          .orderBy(asc(matches.date), asc(matches.id))
          .limit(limit)
        return Promise.all(rows.map(hydrateMatch))
      } catch (e) { if (isMissingTable(e)) return []; throw e }
    },
    async teams() {
      try {
        const rows = await db.select().from(teams).orderBy(asc(teams.name))
        return rows.map(teamWithSlug)
      } catch (e) { if (isMissingTable(e)) return []; throw e }
    },
    async team(_: unknown, { slug }: { slug: string }) {
      try {
        const rows = await db.select().from(teams)
        const found = rows.find(r => slugify(r.name) === slug)
        return found ? teamWithSlug(found) : null
      } catch (e) { if (isMissingTable(e)) return null; throw e }
    },
    async topScorers(_: unknown, { year, limit = 20, teamId }: { year?: number; limit?: number; teamId?: number }) {
      try {
      const conditions = sql`
        ${year ? sql`AND m.tournament_year = ${year}` : sql``}
        ${teamId ? sql`AND g.team_id = ${teamId}` : sql``}
        AND m.is_quali_playoff = false
      `
      const rows = await db.execute(sql`
        SELECT
          g.player_name,
          g.team_id,
          COUNT(*)::int AS goals,
          SUM(CASE WHEN g.is_penalty THEN 1 ELSE 0 END)::int AS penalties,
          SUM(CASE WHEN g.is_own_goal THEN 1 ELSE 0 END)::int AS own_goals,
          COUNT(DISTINCT m.tournament_year)::int AS tournaments
        FROM goals g
        JOIN matches m ON g.match_id = m.id
        WHERE true ${conditions}
        GROUP BY g.player_name, g.team_id
        ORDER BY goals DESC
        LIMIT ${limit}
      `)
      return Promise.all(rows.map(async (r: Record<string, unknown>) => ({
        playerName: r.player_name,
        goals: r.goals,
        penalties: r.penalties,
        ownGoals: r.own_goals,
        tournaments: r.tournaments,
        team: r.team_id ? await getTeamById(r.team_id as number) : null,
      })))
      } catch (e) { if (isMissingTable(e)) return []; throw e }
    },
    async player(_: unknown, { name }: { name: string }) {
      const rows = await db.execute(sql`
        SELECT
          g.player_name,
          g.team_id,
          COUNT(*)::int AS goals,
          SUM(CASE WHEN g.is_penalty THEN 1 ELSE 0 END)::int AS penalties,
          SUM(CASE WHEN g.is_own_goal THEN 1 ELSE 0 END)::int AS own_goals,
          COUNT(DISTINCT m.tournament_year)::int AS tournaments
        FROM goals g
        JOIN matches m ON g.match_id = m.id
        WHERE LOWER(g.player_name) LIKE LOWER(${`%${name}%`})
          AND m.is_quali_playoff = false
        GROUP BY g.player_name, g.team_id
        ORDER BY goals DESC
        LIMIT 1
      `)
      if (!rows[0]) return null
      const r = rows[0] as Record<string, unknown>
      return {
        playerName: r.player_name,
        goals: r.goals,
        penalties: r.penalties,
        ownGoals: r.own_goals,
        tournaments: r.tournaments,
        team: r.team_id ? await getTeamById(r.team_id as number) : null,
      }
    },
    async hatTricks(_: unknown, { year }: { year?: number }) {
      const conditions = year ? sql`AND m.tournament_year = ${year}` : sql``
      const rows = await db.execute(sql`
        SELECT
          g.player_name,
          g.team_id,
          g.match_id,
          COUNT(*)::int AS goals,
          m.tournament_year AS year,
          m.round,
          CASE WHEN m.team1_id = g.team_id THEN m.team2_id ELSE m.team1_id END AS opponent_id
        FROM goals g
        JOIN matches m ON g.match_id = m.id
        WHERE m.is_quali_playoff = false ${conditions}
        GROUP BY g.player_name, g.team_id, g.match_id, m.tournament_year, m.round, m.team1_id, m.team2_id
        HAVING COUNT(*) >= 3
        ORDER BY goals DESC, m.tournament_year DESC
      `)
      return Promise.all(rows.map(async (r: Record<string, unknown>) => ({
        playerName: r.player_name,
        year: r.year,
        round: r.round,
        goals: r.goals,
        team: r.team_id ? await getTeamById(r.team_id as number) : null,
        opponent: r.opponent_id ? await getTeamById(r.opponent_id as number) : null,
      })))
    },
    async groupStandings(_: unknown, { year }: { year: number }) {
      try {
      const rows = await db.select({
        groupName: groupStandings.groupName,
        pos: groupStandings.pos,
        teamId: groupStandings.teamId,
        played: groupStandings.played,
        won: groupStandings.won,
        drawn: groupStandings.drawn,
        lost: groupStandings.lost,
        goalsFor: groupStandings.goalsFor,
        goalsAgainst: groupStandings.goalsAgainst,
        goalDiff: groupStandings.goalDiff,
        pts: groupStandings.pts,
      }).from(groupStandings)
        .where(eq(groupStandings.tournamentYear, year))
        .orderBy(asc(groupStandings.groupName), asc(groupStandings.pos))
      return Promise.all(rows.map(async r => ({
        ...r,
        played: r.played ?? 0,
        won: r.won ?? 0,
        drawn: r.drawn ?? 0,
        lost: r.lost ?? 0,
        goalsFor: r.goalsFor ?? 0,
        goalsAgainst: r.goalsAgainst ?? 0,
        goalDiff: r.goalDiff ?? 0,
        pts: r.pts ?? 0,
        team: (await getTeamById(r.teamId))!,
      })))
      } catch (e) { if (isMissingTable(e)) return []; throw e }
    },
    async stadiums(_: unknown, { year }: { year?: number }) {
      const rows = year
        ? await db.select().from(stadiums).where(eq(stadiums.tournamentYear, year))
        : await db.select().from(stadiums).orderBy(asc(stadiums.name))
      return rows.map(r => ({ ...r, matchCount: 0 }))
    },
    async squads(_: unknown, { year, team }: { year: number; team?: string }) {
      const rows = await db.select().from(squads).where(eq(squads.tournamentYear, year)).orderBy(asc(squads.shirtNumber))
      const filtered = team ? rows.filter(r => r.teamId !== null) : rows
      return Promise.all(filtered.map(async r => {
        const t = await getTeamById(r.teamId)
        const dob = r.dateOfBirth
        const age = dob ? Math.floor((Date.now() - new Date(dob).getTime()) / (1000 * 60 * 60 * 24 * 365.25)) : null
        return { ...r, team: t!, age }
      }))
    },
    async tournamentStats() {
      const empty = { totalTournaments: 0, totalMatches: 0, totalGoals: 0, avgGoalsPerGame: null, mostGoalsInTournament: null, highestScoringMatch: null, biggestWin: null, mostTitles: null }
      try {
        const [totals] = await db.execute(sql`
          SELECT
            COUNT(DISTINCT t.year)::int AS total_tournaments,
            COUNT(DISTINCT m.id)::int AS total_matches,
            COALESCE(SUM(m.score_ft_home + m.score_ft_away), 0)::int AS total_goals,
            ROUND(COALESCE(SUM(m.score_ft_home + m.score_ft_away), 0)::numeric / NULLIF(COUNT(DISTINCT m.id), 0), 2)::float AS avg_goals
          FROM tournaments t
          LEFT JOIN matches m ON m.tournament_year = t.year AND m.is_quali_playoff = false AND m.score_ft_home IS NOT NULL
        `)
        const r = totals as Record<string, unknown>
        return { ...empty, totalTournaments: r.total_tournaments, totalMatches: r.total_matches, totalGoals: r.total_goals, avgGoalsPerGame: r.avg_goals }
      } catch (e) { if (isMissingTable(e)) return empty; throw e }
    },
    async goalsByMinute() {
      const rows = await db.execute(sql`
        SELECT
          CASE
            WHEN g.minute BETWEEN 0 AND 15 THEN '0-15'
            WHEN g.minute BETWEEN 16 AND 30 THEN '16-30'
            WHEN g.minute BETWEEN 31 AND 45 THEN '31-45'
            WHEN g.minute BETWEEN 46 AND 60 THEN '46-60'
            WHEN g.minute BETWEEN 61 AND 75 THEN '61-75'
            WHEN g.minute BETWEEN 76 AND 90 THEN '76-90'
            WHEN g.minute > 90 THEN '90+'
            ELSE 'Unknown'
          END AS bucket,
          COUNT(*)::int AS count
        FROM goals g
        JOIN matches m ON g.match_id = m.id
        WHERE g.minute IS NOT NULL AND m.is_quali_playoff = false
        GROUP BY bucket
        ORDER BY MIN(g.minute)
      `)
      return rows as unknown as { bucket: string; count: number }[]
    },
    async confederationStats() {
      const rows = await db.execute(sql`
        SELECT
          t.confederation,
          COUNT(DISTINCT m.tournament_year || '-' || t.id)::int AS appearances,
          COUNT(DISTINCT CASE WHEN tr.winner = t.name THEN tr.year END)::int AS titles,
          COALESCE(SUM(
            CASE WHEN m.team1_id = t.id THEN COALESCE(m.score_ft_home, 0)
                 WHEN m.team2_id = t.id THEN COALESCE(m.score_ft_away, 0)
                 ELSE 0 END
          ), 0)::int AS total_goals
        FROM teams t
        JOIN matches m ON (m.team1_id = t.id OR m.team2_id = t.id) AND m.is_quali_playoff = false
        JOIN tournaments tr ON tr.year = m.tournament_year
        WHERE t.confederation IS NOT NULL
        GROUP BY t.confederation
        ORDER BY appearances DESC
      `)
      return (rows as Record<string, unknown>[]).map(r => ({
        confederation: r.confederation,
        appearances: r.appearances,
        titles: r.titles,
        totalGoals: r.total_goals,
      }))
    },
    async biggestWins(_: unknown, { limit = 10 }: { limit?: number }) {
      const rows = await db.select().from(matches)
        .where(and(isNotNull(matches.scoreFtHome), eq(matches.isQualiPlayoff, false)))
        .orderBy(desc(sql`ABS(${matches.scoreFtHome} - ${matches.scoreFtAway})`), desc(matches.date))
        .limit(limit)
      return Promise.all(rows.map(hydrateMatch))
    },
    async highestScoringMatches(_: unknown, { limit = 10 }: { limit?: number }) {
      const rows = await db.select().from(matches)
        .where(and(isNotNull(matches.scoreFtHome), eq(matches.isQualiPlayoff, false)))
        .orderBy(desc(sql`${matches.scoreFtHome} + ${matches.scoreFtAway}`), desc(matches.date))
        .limit(limit)
      return Promise.all(rows.map(hydrateMatch))
    },
    async extraTimeStats() {
      const [r] = await db.execute(sql`
        SELECT
          COUNT(*)::int AS total_knockout,
          SUM(CASE WHEN score_et_home IS NOT NULL THEN 1 ELSE 0 END)::int AS went_et,
          SUM(CASE WHEN score_p_home IS NOT NULL THEN 1 ELSE 0 END)::int AS went_pens
        FROM matches
        WHERE group_name IS NULL AND is_quali_playoff = false AND score_ft_home IS NOT NULL
      `)
      const row = r as Record<string, number>
      const total = row.total_knockout || 1
      return {
        totalKnockoutMatches: row.total_knockout,
        wentToExtraTime: row.went_et,
        wentToPenalties: row.went_pens,
        extraTimePct: Math.round((row.went_et / total) * 100),
        penaltiesPct: Math.round((row.went_pens / total) * 100),
      }
    },
    async search(_: unknown, { query }: { query: string }) {
      if (!query || query.trim().length < 2) return { tournaments: [], teams: [], players: [], matches: [] }
      const q = `%${query.trim()}%`
      const [tourRows, teamRows, playerRows, matchRows] = await Promise.all([
        db.select().from(tournaments).where(ilike(tournaments.host, q)).limit(5),
        db.select().from(teams).where(or(ilike(teams.name, q), ilike(teams.fifaCode!, q))).limit(8),
        db.execute(sql`
          SELECT g.player_name, g.team_id,
            COUNT(*)::int AS goals,
            SUM(CASE WHEN g.is_penalty THEN 1 ELSE 0 END)::int AS penalties,
            SUM(CASE WHEN g.is_own_goal THEN 1 ELSE 0 END)::int AS own_goals,
            COUNT(DISTINCT m.tournament_year)::int AS tournaments
          FROM goals g
          JOIN matches m ON g.match_id = m.id
          WHERE LOWER(g.player_name) LIKE LOWER(${q}) AND m.is_quali_playoff = false
          GROUP BY g.player_name, g.team_id
          ORDER BY goals DESC LIMIT 8
        `),
        db.select().from(matches)
          .where(and(
            or(ilike(matches.round, q), ilike(matches.groupName!, q)),
            eq(matches.isQualiPlayoff, false),
          ))
          .limit(5),
      ])
      return {
        tournaments: tourRows.map(r => ({ ...r, avgGoalsPerGame: r.avgGoalsPerGame ? parseFloat(r.avgGoalsPerGame) : null })),
        teams: teamRows.map(teamWithSlug),
        players: await Promise.all(playerRows.map(async (r: Record<string, unknown>) => ({
          playerName: r.player_name, goals: r.goals, penalties: r.penalties,
          ownGoals: r.own_goals, tournaments: r.tournaments,
          team: r.team_id ? await getTeamById(r.team_id as number) : null,
        }))),
        matches: await Promise.all(matchRows.map(hydrateMatch)),
      }
    },
  },
  Tournament: {
    async topScorers(parent: { year: number }, { limit = 10 }: { limit?: number }) {
      const rows = await db.execute(sql`
        SELECT g.player_name, g.team_id,
          COUNT(*)::int AS goals,
          SUM(CASE WHEN g.is_penalty THEN 1 ELSE 0 END)::int AS penalties,
          SUM(CASE WHEN g.is_own_goal THEN 1 ELSE 0 END)::int AS own_goals,
          1 AS tournaments
        FROM goals g
        JOIN matches m ON g.match_id = m.id
        WHERE m.tournament_year = ${parent.year} AND m.is_quali_playoff = false
        GROUP BY g.player_name, g.team_id
        ORDER BY goals DESC LIMIT ${limit}
      `)
      return Promise.all(rows.map(async (r: Record<string, unknown>) => ({
        playerName: r.player_name, goals: r.goals, penalties: r.penalties,
        ownGoals: r.own_goals, tournaments: r.tournaments,
        team: r.team_id ? await getTeamById(r.team_id as number) : null,
      })))
    },
    async matches(parent: { year: number }) {
      const rows = await db.select().from(matches)
        .where(and(eq(matches.tournamentYear, parent.year), eq(matches.isQualiPlayoff, false)))
        .orderBy(asc(matches.date), asc(matches.id))
      return Promise.all(rows.map(hydrateMatch))
    },
  },
  Team: {
    async stats(parent: { id: number; name: string }) {
      const [r] = await db.execute(sql`
        SELECT
          COUNT(DISTINCT m.tournament_year)::int AS appearances,
          SUM(CASE
            WHEN m.team1_id = ${parent.id} AND m.score_ft_home > m.score_ft_away THEN 1
            WHEN m.team2_id = ${parent.id} AND m.score_ft_away > m.score_ft_home THEN 1
            ELSE 0 END)::int AS wins,
          SUM(CASE WHEN m.score_ft_home = m.score_ft_away AND m.score_ft_home IS NOT NULL THEN 1 ELSE 0 END)::int AS draws,
          SUM(CASE
            WHEN m.team1_id = ${parent.id} AND m.score_ft_home < m.score_ft_away THEN 1
            WHEN m.team2_id = ${parent.id} AND m.score_ft_away < m.score_ft_home THEN 1
            ELSE 0 END)::int AS losses,
          SUM(CASE WHEN m.team1_id = ${parent.id} THEN COALESCE(m.score_ft_home, 0)
                   WHEN m.team2_id = ${parent.id} THEN COALESCE(m.score_ft_away, 0) ELSE 0 END)::int AS goals_for,
          SUM(CASE WHEN m.team1_id = ${parent.id} THEN COALESCE(m.score_ft_away, 0)
                   WHEN m.team2_id = ${parent.id} THEN COALESCE(m.score_ft_home, 0) ELSE 0 END)::int AS goals_against,
          COUNT(DISTINCT CASE WHEN t.winner = ${parent.name} THEN t.year END)::int AS titles
        FROM matches m
        JOIN tournaments t ON t.year = m.tournament_year
        WHERE (m.team1_id = ${parent.id} OR m.team2_id = ${parent.id})
          AND m.is_quali_playoff = false
          AND m.score_ft_home IS NOT NULL
      `)
      const row = r as Record<string, number>
      const played = (row.wins ?? 0) + (row.draws ?? 0) + (row.losses ?? 0)
      return {
        appearances: row.appearances ?? 0,
        wins: row.wins ?? 0,
        draws: row.draws ?? 0,
        losses: row.losses ?? 0,
        goalsFor: row.goals_for ?? 0,
        goalsAgainst: row.goals_against ?? 0,
        goalDiff: (row.goals_for ?? 0) - (row.goals_against ?? 0),
        titles: row.titles ?? 0,
        winPct: played > 0 ? Math.round(((row.wins ?? 0) / played) * 100) : 0,
      }
    },
  },
}