package db

import (
	"context"
	"fmt"

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

type TeamRoster struct {
	bun.BaseModel `bun:"table:team_rosters,alias:tr"`
	TeamID        int  `bun:",pk,notnull" json:"team_id"`
	SeasonID      int  `bun:",pk,notnull,unique:player" json:"season_id"`
	LeagueID      int  `bun:",pk,notnull,unique:player" json:"league_id"`
	PlayerID      int  `bun:",pk,notnull,unique:player" json:"player_id"`
	IsManager     bool `bun:"is_manager,default:'false'" json:"is_manager"`

	Team   *Team   `bun:"rel:belongs-to,join:team_id=id" json:"-"`
	Player *Player `bun:"rel:belongs-to,join:player_id=id" json:"-"`
	Season *Season `bun:"rel:belongs-to,join:season_id=id" json:"-"`
	League *League `bun:"rel:belongs-to,join:league_id=id" json:"-"`
}

type TeamWithRoster struct {
	Team    *Team
	Season  *Season
	League  *League
	Manager *Player
	Players []*Player
}

func GetTeamRoster(ctx context.Context, tx bun.Tx, seasonShortName, leagueShortName string, teamID int) (*TeamWithRoster, error) {
	tr := []*TeamRoster{}
	err := tx.NewSelect().
		Model(&tr).
		Relation("Team", func(q *bun.SelectQuery) *bun.SelectQuery {
			return q.Where("team.id = ?", teamID)
		}).
		Relation("Season", func(q *bun.SelectQuery) *bun.SelectQuery {
			return q.Where("season.short_name = ?", seasonShortName)
		}).
		Relation("League", func(q *bun.SelectQuery) *bun.SelectQuery {
			return q.Where("league.short_name = ?", leagueShortName)
		}).
		Relation("Player").Scan(ctx)
	if err != nil {
		return nil, errors.Wrap(err, "tx.NewSelect")
	}
	team, err := GetTeam(ctx, tx, teamID)
	if err != nil {
		return nil, errors.Wrap(err, "GetTeam")
	}
	sl, err := GetSeasonLeague(ctx, tx, seasonShortName, leagueShortName)
	if err != nil {
		return nil, errors.Wrap(err, "GetSeasonLeague")
	}
	var manager *Player
	players := []*Player{}
	for _, tp := range tr {
		if tp.IsManager {
			manager = tp.Player
		} else {
			players = append(players, tp.Player)
		}
	}
	players = append([]*Player{manager}, players...)
	twr := &TeamWithRoster{
		team,
		sl.Season,
		sl.League,
		manager,
		players,
	}
	return twr, nil
}

// GetManagersByTeam returns a map of teamID -> manager Player for all teams in a season/league
func GetManagersByTeam(ctx context.Context, tx bun.Tx, seasonID, leagueID int) (map[int]*Player, error) {
	rosters := []*TeamRoster{}
	err := tx.NewSelect().
		Model(&rosters).
		Where("tr.season_id = ?", seasonID).
		Where("tr.league_id = ?", leagueID).
		Where("tr.is_manager = true").
		Relation("Player").
		Scan(ctx)
	if err != nil {
		return nil, errors.Wrap(err, "tx.NewSelect")
	}
	result := make(map[int]*Player, len(rosters))
	for _, r := range rosters {
		result[r.TeamID] = r.Player
	}
	return result, nil
}

func AddPlayerToTeam(ctx context.Context, tx bun.Tx, seasonID, leagueID, teamID, playerID int, manager bool, audit *AuditMeta) error {
	season, err := GetByID[Season](tx, seasonID).Get(ctx)
	if err != nil {
		return errors.Wrap(err, "GetSeason")
	}
	league, err := GetByID[League](tx, leagueID).Get(ctx)
	if err != nil {
		return errors.Wrap(err, "GetLeague")
	}
	team, err := GetByID[Team](tx, teamID).Get(ctx)
	if err != nil {
		return errors.Wrap(err, "GetTeam")
	}
	player, err := GetByID[Player](tx, playerID).Get(ctx)
	if err != nil {
		return errors.Wrap(err, "GetPlayer")
	}
	tr := &TeamRoster{
		SeasonID:  season.ID,
		LeagueID:  league.ID,
		TeamID:    team.ID,
		PlayerID:  player.ID,
		IsManager: manager,
	}
	err = Insert(tx, tr).WithAudit(audit, nil).Exec(ctx)
	if err != nil {
		return errors.Wrap(err, "Insert")
	}
	return nil
}

// ManageTeamRoster replaces the entire roster for a team in a season/league.
// It deletes all existing roster entries and inserts the new ones.
func ManageTeamRoster(ctx context.Context, tx bun.Tx, seasonID, leagueID, teamID, managerID int, playerIDs []int, audit *AuditMeta) error {
	// Delete all existing roster entries for this team/season/league
	_, err := tx.NewDelete().
		Model((*TeamRoster)(nil)).
		Where("season_id = ?", seasonID).
		Where("league_id = ?", leagueID).
		Where("team_id = ?", teamID).
		Exec(ctx)
	if err != nil {
		return errors.Wrap(err, "delete existing roster")
	}

	// Insert manager if provided
	if managerID > 0 {
		tr := &TeamRoster{
			SeasonID:  seasonID,
			LeagueID:  leagueID,
			TeamID:    teamID,
			PlayerID:  managerID,
			IsManager: true,
		}
		err = Insert(tx, tr).Exec(ctx)
		if err != nil {
			return errors.Wrap(err, "Insert manager")
		}
	}

	// Insert players
	for _, playerID := range playerIDs {
		if playerID == managerID {
			continue // Already inserted as manager
		}
		tr := &TeamRoster{
			SeasonID:  seasonID,
			LeagueID:  leagueID,
			TeamID:    teamID,
			PlayerID:  playerID,
			IsManager: false,
		}
		err = Insert(tx, tr).Exec(ctx)
		if err != nil {
			return errors.Wrap(err, "Insert player")
		}
	}

	// Log the roster change
	details := map[string]any{
		"season_id":  seasonID,
		"league_id":  leagueID,
		"team_id":    teamID,
		"manager_id": managerID,
		"player_ids": playerIDs,
	}
	info := &AuditInfo{
		"teams.manage_players",
		"team_roster",
		fmt.Sprintf("%d-%d-%d", seasonID, leagueID, teamID),
		details,
	}
	err = LogSuccess(ctx, tx, audit, info)
	if err != nil {
		return errors.Wrap(err, "LogSuccess")
	}

	return nil
}