package repository

import (
	"butterfliu/internal/model"
	"database/sql"
)

type AlbumRepository struct {
	db *sql.DB
}

func NewAlbumRepository(db *sql.DB) *AlbumRepository {
	return &AlbumRepository{db: db}
}

func (r *AlbumRepository) Get(id int) (model.Album, error) {
	row := r.db.QueryRow("SELECT id, title, artist_id FROM albums WHERE id = ?", id)
	var album model.Album
	if err := row.Scan(&album.ID, &album.Title, &album.ArtistID); err != nil {
		return model.Album{}, err
	}
	return album, nil
}

func (r *AlbumRepository) GetByTitleAndArtist(title string, artistID int) (model.Album, error) {
	row := r.db.QueryRow(`
		SELECT id, title, artist_id, COALESCE(cover, ''), COALESCE(year, 0)
		FROM albums WHERE title = ? AND artist_id = ?
	`)
	var album model.Album
	if err := row.Scan(&album.ID, &album.Title, &album.ArtistID, &album.Cover, &album.Year); err != nil {
		return model.Album{}, err
	}
	return album, nil
}

func (r *AlbumRepository) Create(title string, artistID int) (model.Album, error) {
	result, err := r.db.Exec("INSERT INTO albums (title, artist_id) VALUES (?, ?)", title, artistID)
	if err != nil {
		return model.Album{}, err
	}

	id, err := result.LastInsertId()
	if err != nil {
		return model.Album{}, err
	}

	return model.Album{
		ID:       int(id),
		Title:    title,
		ArtistID: artistID,
	}, nil
}

func (r *AlbumRepository) GetAll() ([]model.Album, error) {
	rows, err := r.db.Query("SELECT id, title, artist_id FROM albums")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	albums := []model.Album{}
	for rows.Next() {
		var album model.Album
		if err := rows.Scan(&album.ID, &album.Title, &album.ArtistID); err != nil {
			return nil, err
		}
		albums = append(albums, album)
	}
	return albums, nil
}

func (r *AlbumRepository) GetByArtist(artistID int) ([]model.Album, error) {
	rows, err := r.db.Query("SELECT id, title, artist_id FROM albums WHERE artist_id = ?", artistID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	albums := []model.Album{}
	for rows.Next() {
		var album model.Album
		if err := rows.Scan(&album.ID, &album.Title, &album.ArtistID); err != nil {
			return nil, err
		}
		albums = append(albums, album)
	}
	return albums, nil
}

func (r *AlbumRepository) GetIDsByArtist(artistID int) ([]int, error) {
	rows, err := r.db.Query("SELECT id FROM albums WHERE artist_id = ?", artistID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	ids := []int{}
	for rows.Next() {
		var id int
		if err := rows.Scan(&id); err != nil {
			return nil, err
		}
		ids = append(ids, id)
	}
	return ids, nil
}

func (r *AlbumRepository) GetSongIDs(albumID int) ([]int, error) {
	rows, err := r.db.Query("SELECT id FROM songs WHERE album_id = ?", albumID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	ids := []int{}
	for rows.Next() {
		var id int
		if err := rows.Scan(&id); err != nil {
			return nil, err
		}
		ids = append(ids, id)
	}
	return ids, nil
}