package postgresql

import (
	"database/sql"
	"github.com/lib/pq"
	"hamster-tycoon/storage/dao"
	"hamster-tycoon/storage/model"
)

func (db *DatabasePostgreSQL) GetAllGames() ([]*model.Game, error) {
	q := `
		SELECT g.id, g.server_id, g.user_id, g.created_at, g.updated_at
		FROM public.game g
	`
	rows, err := db.session.Query(q)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	games := make([]*model.Game, 0)
	for rows.Next() {
		server := model.Server{}
		user := model.User{}
		game := model.Game{
			Server: server,
		}
		err := rows.Scan(&game.ID, &server.ID, &user.ID, &game.CreatedAt, &game.UpdatedAt)
		if err != nil {
			return nil, err
		}
		games = append(games, &game)
	}
	return games, nil
}

func (db *DatabasePostgreSQL) GetGameByID(id string) (*model.Game, error) {
	q := `
		SELECT g.id, g.server_id, g.user_id, g.created_at, g.updated_at
		FROM public.game g
		WHERE g.id = $1
	`
	row := db.session.QueryRow(q, id)

	server := model.Server{}
	user := model.User{}
	game := model.Game{
		Server: server,
	}
	err := row.Scan(&game.ID, &server.ID, &user.ID, &game.CreatedAt, &game.UpdatedAt)
	if errPq, ok := err.(*pq.Error); ok {
		return nil, handlePgError(errPq)
	}
	if err == sql.ErrNoRows {
		return nil, dao.NewDAOError(dao.ErrTypeNotFound, err)
	}
	return &game, err
}

func (db *DatabasePostgreSQL) CreateGame(game *model.Game) error {
	q := `
		INSERT INTO public.game
			(server_id, user_id)
		VALUES
			($1, $2)
		RETURNING id, created_at
	`

	err := db.session.
		QueryRow(q, game.Server.ID, game.User.ID).
		Scan(&game.ID, &game.CreatedAt)
	if errPq, ok := err.(*pq.Error); ok {
		return handlePgError(errPq)
	}
	return err
}

func (db *DatabasePostgreSQL) DeleteGame(id string) error {
	q := `
		DELETE FROM public.game
		WHERE id = $1
	`

	_, err := db.session.Exec(q, id)
	if errPq, ok := err.(*pq.Error); ok {
		return handlePgError(errPq)
	}
	return err
}

func (db *DatabasePostgreSQL) GetHamstersOfGame(gameID string) ([]*model.Hamster, error) {
	q := `
		SELECT id, created_at, updated_at, name, number, sexe, age, father_id, mother_id, hunger_level, thirst_level, weight, height, alive, sold, gestation, gestation_period, gestation_cooldown, gestation_father_id
		FROM public.Hamster h
		JOIN public.cage c
		ON c.id = h.cage_id
		JOIN public.game g
		on c.game_id = g.id
		WHERE g.id = $1
	`
	rows, err := db.session.Query(q, gameID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	hamsters := make([]*model.Hamster, 0)
	for rows.Next() {
		hamster := model.Hamster{
			Mother:          &model.Hamster{},
			Father:          &model.Hamster{},
			GestationFather: &model.Hamster{},
		}
		err := rows.Scan(&hamster.ID, &hamster.CreatedAt,
			&hamster.UpdatedAt, &hamster.Name,
			&hamster.Number, &hamster.Sexe,
			&hamster.Age, &hamster.Father.ID,
			&hamster.Mother.ID, &hamster.HungerLevel,
			&hamster.ThirstLevel, &hamster.Weight,
			&hamster.Height, &hamster.Alive,
			&hamster.Sold, &hamster.Gestation,
			&hamster.GestationPeriod, &hamster.GestationCooldown,
			&hamster.GestationFather.ID)
		if err != nil {
			return nil, err
		}
		hamsters = append(hamsters, &hamster)
	}
	return hamsters, nil
}

func (db *DatabasePostgreSQL) UpdateGame(*model.Game) error {
	return nil
}