package sqlite

import (
	"database/sql"
	"fmt"

	"lunar-tear/server/internal/model"
	"lunar-tear/server/internal/store"
)

func (s *SQLiteStore) CreateUser(uuid string, platform model.ClientPlatform) (int64, error) {
	tx, err := s.db.Begin()
	if err != nil {
		return 0, fmt.Errorf("begin tx: %w", err)
	}
	defer tx.Rollback()

	nowMillis := s.clock().UnixMilli()

	res, err := tx.Exec(`INSERT INTO users (uuid, player_id, os_type, platform_type, user_restriction_type,
		register_datetime, game_start_datetime, latest_version, birth_year, birth_month,
		backup_token, charge_money_this_month) VALUES (?, 0, ?, ?, 0, ?, ?, 0, 2000, 1, 'mock-backup-token', 0)`,
		uuid, platform.OsType, platform.PlatformType, nowMillis, nowMillis)
	if err != nil {
		return 0, fmt.Errorf("insert user: %w", err)
	}
	userId, err := res.LastInsertId()
	if err != nil {
		return 0, fmt.Errorf("last insert id: %w", err)
	}

	// player_id = user_id
	if _, err := tx.Exec(`UPDATE users SET player_id = ? WHERE user_id = ?`, userId, userId); err != nil {
		return 0, fmt.Errorf("update player_id: %w", err)
	}

	user := store.SeedUserState(userId, uuid, nowMillis, platform)
	if err := writeUserState(tx, userId, user); err != nil {
		return 0, fmt.Errorf("write seed state: %w", err)
	}

	if err := tx.Commit(); err != nil {
		return 0, fmt.Errorf("commit: %w", err)
	}
	return userId, nil
}

func (s *SQLiteStore) GetUserByUUID(uuid string) (int64, error) {
	var userId int64
	err := s.db.QueryRow(`SELECT user_id FROM users WHERE uuid = ?`, uuid).Scan(&userId)
	if err == sql.ErrNoRows {
		return 0, store.ErrNotFound
	}
	if err != nil {
		return 0, fmt.Errorf("query user: %w", err)
	}
	return userId, nil
}

func (s *SQLiteStore) DefaultUserId() (int64, error) {
	var userId int64
	err := s.db.QueryRow(`SELECT min(user_id) FROM users`).Scan(&userId)
	if err != nil || userId == 0 {
		return 0, store.ErrNotFound
	}
	return userId, nil
}

// ImportUser replaces all data for u.UserId in the database with the
// contents of u.  Any pre-existing rows for that user are deleted first.
func (s *SQLiteStore) ImportUser(u *store.UserState) error {
	tx, err := s.db.Begin()
	if err != nil {
		return fmt.Errorf("begin tx: %w", err)
	}
	defer tx.Rollback()

	uid := u.UserId

	// Child tables in reverse-dependency order (matches schema's goose Down).
	childTables := []string{
		"user_event_quest_labyrinth_stages",
		"user_event_quest_labyrinth_seasons",
		"user_event_quest_tower_accumulation_rewards",
		"user_cage_ornament_rewards",
		"user_shop_replaceable_lineup",
		"user_shop_items",
		"user_gacha_banner_box_drew_counts",
		"user_gacha_banners",
		"user_gacha_converted_medals",
		"user_gifts",
		"user_dokan_confirmed",
		"user_drawn_omikuji",
		"user_contents_stories",
		"user_viewed_movies",
		"user_navi_cutin_played",
		"user_auto_sale_settings",
		"user_explore_scores",
		"user_tutorials",
		"user_premium_items",
		"user_important_items",
		"user_materials",
		"user_consumable_items",
		"user_gimmick_unlocks",
		"user_gimmick_sequences",
		"user_gimmick_ornament_progress",
		"user_gimmick_progress",
		"user_big_hunt_weekly_statuses",
		"user_big_hunt_weekly_max_scores",
		"user_big_hunt_schedule_max_scores",
		"user_big_hunt_statuses",
		"user_big_hunt_max_scores",
		"user_quest_limit_content_status",
		"user_side_story_quests",
		"user_main_quest_season_routes",
		"user_missions",
		"user_quest_missions",
		"user_quests",
		"user_deck_type_notes",
		"user_deck_parts",
		"user_deck_sub_weapons",
		"user_decks",
		"user_deck_characters",
		"user_parts_status_subs",
		"user_parts_preset_tags",
		"user_parts_presets",
		"user_parts_group_notes",
		"user_parts",
		"user_thoughts",
		"user_companions",
		"user_weapon_notes",
		"user_weapon_stories",
		"user_weapon_awakens",
		"user_weapon_abilities",
		"user_weapon_skills",
		"user_weapons",
		"user_costume_awaken_status_ups",
		"user_costume_active_skills",
		"user_costumes",
		"user_character_rebirths",
		"user_character_board_status_ups",
		"user_character_board_abilities",
		"user_character_boards",
		"user_characters",
		"user_gacha",
		"user_shop_replaceable",
		"user_explore",
		"user_guerrilla_free_open",
		"user_portal_cage",
		"user_notification",
		"user_battle",
		"user_big_hunt_state",
		"user_side_story_active",
		"user_extra_quest",
		"user_event_quest",
		"user_main_quest",
		"user_login_bonus",
		"user_login",
		"user_profile",
		"user_gem",
		"user_status",
		"user_setting",
		"sessions",
	}

	for _, t := range childTables {
		if _, err := tx.Exec(fmt.Sprintf(`DELETE FROM %s WHERE user_id = ?`, t), uid); err != nil {
			return fmt.Errorf("delete from %s: %w", t, err)
		}
	}
	if _, err := tx.Exec(`DELETE FROM users WHERE user_id = ?`, uid); err != nil {
		return fmt.Errorf("delete user: %w", err)
	}

	if _, err := tx.Exec(`INSERT INTO users (user_id, uuid, player_id, os_type, platform_type,
		user_restriction_type, register_datetime, game_start_datetime, latest_version,
		birth_year, birth_month, backup_token, charge_money_this_month)
		VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?)`,
		uid, u.Uuid, u.PlayerId, u.OsType, u.PlatformType, u.UserRestrictionType,
		u.RegisterDatetime, u.GameStartDatetime, u.LatestVersion,
		u.BirthYear, u.BirthMonth, u.BackupToken, u.ChargeMoneyThisMonth); err != nil {
		return fmt.Errorf("insert user: %w", err)
	}

	if err := writeUserState(tx, uid, u); err != nil {
		return fmt.Errorf("write user state: %w", err)
	}

	if err := tx.Commit(); err != nil {
		return fmt.Errorf("commit: %w", err)
	}

	return nil
}

func (s *SQLiteStore) SetFacebookId(userId int64, facebookId int64) error {
	_, err := s.db.Exec(`UPDATE users SET facebook_id = ? WHERE user_id = ?`, facebookId, userId)
	if err != nil {
		return fmt.Errorf("set facebook_id: %w", err)
	}
	return nil
}

func (s *SQLiteStore) GetUserByFacebookId(facebookId int64) (int64, error) {
	var userId int64
	err := s.db.QueryRow(`SELECT user_id FROM users WHERE facebook_id = ?`, facebookId).Scan(&userId)
	if err == sql.ErrNoRows {
		return 0, store.ErrNotFound
	}
	if err != nil {
		return 0, fmt.Errorf("query user by facebook_id: %w", err)
	}
	return userId, nil
}

func (s *SQLiteStore) GetFacebookId(userId int64) (int64, error) {
	var fbId sql.NullInt64
	err := s.db.QueryRow(`SELECT facebook_id FROM users WHERE user_id = ?`, userId).Scan(&fbId)
	if err != nil {
		return 0, store.ErrNotFound
	}
	return fbId.Int64, nil
}

func (s *SQLiteStore) ClearFacebookId(userId int64) error {
	_, err := s.db.Exec(`UPDATE users SET facebook_id = NULL WHERE user_id = ?`, userId)
	if err != nil {
		return fmt.Errorf("clear facebook_id: %w", err)
	}
	return nil
}

func (s *SQLiteStore) UpdateUUID(userId int64, newUuid string) error {
	_, err := s.db.Exec(`UPDATE users SET uuid = ? WHERE user_id = ?`, newUuid, userId)
	if err != nil {
		return fmt.Errorf("update uuid: %w", err)
	}
	return nil
}

func (s *SQLiteStore) UpdateUser(userId int64, mutate func(*store.UserState)) (store.UserState, error) {
	before, err := s.LoadUser(userId)
	if err != nil {
		return store.UserState{}, err
	}

	after := store.CloneUserState(before)
	mutate(&after)

	tx, err := s.db.Begin()
	if err != nil {
		return store.UserState{}, fmt.Errorf("begin tx: %w", err)
	}
	defer tx.Rollback()

	if err := diffAndSave(tx, userId, &before, &after); err != nil {
		return store.UserState{}, fmt.Errorf("diff and save: %w", err)
	}

	if err := tx.Commit(); err != nil {
		return store.UserState{}, fmt.Errorf("commit: %w", err)
	}

	return after, nil
}