package db

import (
	"context"

	"github.com/pkg/errors"
	"github.com/uptrace/bun"
)

// GetPlayoffPlayerStats returns aggregated player stats from playoff fixtures only
// (fixtures with round < 0) for a season-league.
// Reuses the same LeaguePlayerStats struct as regular season stats.
func GetPlayoffPlayerStats(
	ctx context.Context,
	tx bun.Tx,
	seasonID, leagueID int,
) ([]*LeaguePlayerStats, error) {
	if seasonID == 0 {
		return nil, errors.New("seasonID not provided")
	}
	if leagueID == 0 {
		return nil, errors.New("leagueID not provided")
	}

	var stats []*LeaguePlayerStats
	err := tx.NewRaw(`
		SELECT
			agg.player_id,
			agg.player_name,
			COALESCE(tr.team_id, 0) AS team_id,
			COALESCE(t.name, '') AS team_name,
			COALESCE(t.color, '') AS team_color,
			agg.games_played,
			agg.total_periods_played,
			agg.total_goals,
			agg.total_assists,
			agg.total_primary_assists,
			agg.total_secondary_assists,
			agg.total_saves,
			agg.total_shots,
			agg.total_blocks,
			agg.total_passes,
			agg.total_score
		FROM (
			SELECT
				frps.player_id AS player_id,
				COALESCE(p.name, frps.player_username) AS player_name,
				COUNT(DISTINCT frps.fixture_result_id) AS games_played,
				COALESCE(SUM(frps.periods_played), 0) AS total_periods_played,
				COALESCE(SUM(frps.goals), 0) AS total_goals,
				COALESCE(SUM(frps.assists), 0) AS total_assists,
				COALESCE(SUM(frps.primary_assists), 0) AS total_primary_assists,
				COALESCE(SUM(frps.secondary_assists), 0) AS total_secondary_assists,
				COALESCE(SUM(frps.saves), 0) AS total_saves,
				COALESCE(SUM(frps.shots), 0) AS total_shots,
				COALESCE(SUM(frps.blocks), 0) AS total_blocks,
				COALESCE(SUM(frps.passes), 0) AS total_passes,
				COALESCE(SUM(frps.score), 0) AS total_score
			FROM fixture_result_player_stats frps
			JOIN fixture_results fr ON fr.id = frps.fixture_result_id
			JOIN fixtures f ON f.id = fr.fixture_id
			LEFT JOIN players p ON p.id = frps.player_id
			WHERE fr.finalized = true
			  AND f.season_id = ?
			  AND f.league_id = ?
			  AND f.round < 0
			  AND frps.period_num = 3
			  AND frps.player_id IS NOT NULL
			GROUP BY frps.player_id, COALESCE(p.name, frps.player_username)
		) agg
		LEFT JOIN team_rosters tr
			ON tr.player_id = agg.player_id
			AND tr.season_id = ?
			AND tr.league_id = ?
		LEFT JOIN teams t ON t.id = tr.team_id
		ORDER BY agg.total_score DESC
	`, seasonID, leagueID, seasonID, leagueID).Scan(ctx, &stats)
	if err != nil {
		return nil, errors.Wrap(err, "tx.NewRaw")
	}
	return stats, nil
}

// GetPlayoffTopGoalScorers returns the top 10 goal scorers from playoff fixtures.
func GetPlayoffTopGoalScorers(
	ctx context.Context,
	tx bun.Tx,
	seasonID, leagueID int,
) ([]*LeagueTopGoalScorer, error) {
	if seasonID == 0 {
		return nil, errors.New("seasonID not provided")
	}
	if leagueID == 0 {
		return nil, errors.New("leagueID not provided")
	}

	var stats []*LeagueTopGoalScorer
	err := tx.NewRaw(`
		SELECT
			agg.player_id,
			agg.player_name,
			COALESCE(tr.team_id, 0) AS team_id,
			COALESCE(t.name, '') AS team_name,
			COALESCE(t.color, '') AS team_color,
			agg.total_goals,
			agg.total_periods_played,
			agg.total_shots
		FROM (
			SELECT
				frps.player_id AS player_id,
				COALESCE(p.name, frps.player_username) AS player_name,
				COALESCE(SUM(frps.goals), 0) AS total_goals,
				COALESCE(SUM(frps.periods_played), 0) AS total_periods_played,
				COALESCE(SUM(frps.shots), 0) AS total_shots
			FROM fixture_result_player_stats frps
			JOIN fixture_results fr ON fr.id = frps.fixture_result_id
			JOIN fixtures f ON f.id = fr.fixture_id
			LEFT JOIN players p ON p.id = frps.player_id
			WHERE fr.finalized = true
			  AND f.season_id = ?
			  AND f.league_id = ?
			  AND f.round < 0
			  AND frps.period_num = 3
			  AND frps.player_id IS NOT NULL
			GROUP BY frps.player_id, COALESCE(p.name, frps.player_username)
			ORDER BY total_goals DESC, total_periods_played ASC, total_shots ASC
			LIMIT 10
		) agg
		LEFT JOIN team_rosters tr
			ON tr.player_id = agg.player_id
			AND tr.season_id = ?
			AND tr.league_id = ?
		LEFT JOIN teams t ON t.id = tr.team_id
		ORDER BY agg.total_goals DESC, agg.total_periods_played ASC, agg.total_shots ASC
	`, seasonID, leagueID, seasonID, leagueID).Scan(ctx, &stats)
	if err != nil {
		return nil, errors.Wrap(err, "tx.NewRaw")
	}
	return stats, nil
}

// GetPlayoffTopAssisters returns the top 10 assisters from playoff fixtures.
func GetPlayoffTopAssisters(
	ctx context.Context,
	tx bun.Tx,
	seasonID, leagueID int,
) ([]*LeagueTopAssister, error) {
	if seasonID == 0 {
		return nil, errors.New("seasonID not provided")
	}
	if leagueID == 0 {
		return nil, errors.New("leagueID not provided")
	}

	var stats []*LeagueTopAssister
	err := tx.NewRaw(`
		SELECT
			agg.player_id,
			agg.player_name,
			COALESCE(tr.team_id, 0) AS team_id,
			COALESCE(t.name, '') AS team_name,
			COALESCE(t.color, '') AS team_color,
			agg.total_assists,
			agg.total_periods_played,
			agg.total_primary_assists
		FROM (
			SELECT
				frps.player_id AS player_id,
				COALESCE(p.name, frps.player_username) AS player_name,
				COALESCE(SUM(frps.assists), 0) AS total_assists,
				COALESCE(SUM(frps.periods_played), 0) AS total_periods_played,
				COALESCE(SUM(frps.primary_assists), 0) AS total_primary_assists
			FROM fixture_result_player_stats frps
			JOIN fixture_results fr ON fr.id = frps.fixture_result_id
			JOIN fixtures f ON f.id = fr.fixture_id
			LEFT JOIN players p ON p.id = frps.player_id
			WHERE fr.finalized = true
			  AND f.season_id = ?
			  AND f.league_id = ?
			  AND f.round < 0
			  AND frps.period_num = 3
			  AND frps.player_id IS NOT NULL
			GROUP BY frps.player_id, COALESCE(p.name, frps.player_username)
			ORDER BY total_assists DESC, total_periods_played ASC, total_primary_assists DESC
			LIMIT 10
		) agg
		LEFT JOIN team_rosters tr
			ON tr.player_id = agg.player_id
			AND tr.season_id = ?
			AND tr.league_id = ?
		LEFT JOIN teams t ON t.id = tr.team_id
		ORDER BY agg.total_assists DESC, agg.total_periods_played ASC, agg.total_primary_assists DESC
	`, seasonID, leagueID, seasonID, leagueID).Scan(ctx, &stats)
	if err != nil {
		return nil, errors.Wrap(err, "tx.NewRaw")
	}
	return stats, nil
}

// GetPlayoffTopSavers returns the top 10 savers from playoff fixtures.
func GetPlayoffTopSavers(
	ctx context.Context,
	tx bun.Tx,
	seasonID, leagueID int,
) ([]*LeagueTopSaver, error) {
	if seasonID == 0 {
		return nil, errors.New("seasonID not provided")
	}
	if leagueID == 0 {
		return nil, errors.New("leagueID not provided")
	}

	var stats []*LeagueTopSaver
	err := tx.NewRaw(`
		SELECT
			agg.player_id,
			agg.player_name,
			COALESCE(tr.team_id, 0) AS team_id,
			COALESCE(t.name, '') AS team_name,
			COALESCE(t.color, '') AS team_color,
			agg.total_saves,
			agg.total_periods_played,
			agg.total_blocks
		FROM (
			SELECT
				frps.player_id AS player_id,
				COALESCE(p.name, frps.player_username) AS player_name,
				COALESCE(SUM(frps.saves), 0) AS total_saves,
				COALESCE(SUM(frps.periods_played), 0) AS total_periods_played,
				COALESCE(SUM(frps.blocks), 0) AS total_blocks
			FROM fixture_result_player_stats frps
			JOIN fixture_results fr ON fr.id = frps.fixture_result_id
			JOIN fixtures f ON f.id = fr.fixture_id
			LEFT JOIN players p ON p.id = frps.player_id
			WHERE fr.finalized = true
			  AND f.season_id = ?
			  AND f.league_id = ?
			  AND f.round < 0
			  AND frps.period_num = 3
			  AND frps.player_id IS NOT NULL
			GROUP BY frps.player_id, COALESCE(p.name, frps.player_username)
			ORDER BY total_saves DESC, total_periods_played ASC, total_blocks DESC
			LIMIT 10
		) agg
		LEFT JOIN team_rosters tr
			ON tr.player_id = agg.player_id
			AND tr.season_id = ?
			AND tr.league_id = ?
		LEFT JOIN teams t ON t.id = tr.team_id
		ORDER BY agg.total_saves DESC, agg.total_periods_played ASC, agg.total_blocks DESC
	`, seasonID, leagueID, seasonID, leagueID).Scan(ctx, &stats)
	if err != nil {
		return nil, errors.Wrap(err, "tx.NewRaw")
	}
	return stats, nil
}