import sqlite3
import os
import logging

logging.basicConfig(level=logging.DEBUG)

def get_temp_dir():
    import tempfile

    temp_folder = "music-downloader"
    temp_dir = os.path.join(tempfile.gettempdir(), temp_folder)
    if not os.path.exists(temp_dir):
        os.mkdir(temp_dir)
    return temp_dir

DATABASE_STRUCTURE_FILE = "src/metadata/database_structure.sql"
TEMP_DIR = get_temp_dir()
DATABASE_FILE = "metadata.db"
db_path = os.path.join(TEMP_DIR, DATABASE_FILE)

connection = sqlite3.connect(db_path)
cursor = connection.cursor()

def init_db(cursor, connection, reset_anyways: bool = False):
    # check if db exists
    exists = True
    try:
        query = 'SELECT * FROM track;'
        cursor.execute(query)
        _ = cursor.fetchall()
    except sqlite3.OperationalError:
        exists = False
    
    if not exists:
        logging.info("Database does not exist yet.")

    if reset_anyways or not exists:
        # reset the database if reset_anyways is true or if an error has been thrown previously.
        logging.info("Creating/Reseting Database.")

        # read the file
        with open(DATABASE_STRUCTURE_FILE, "r") as database_structure_file:
            query = database_structure_file.read()
            cursor.executescript(query)

init_db(cursor=cursor, connection=connection, reset_anyways=True)

def add_artist(
    musicbrainz_artistid: str,
    artist: str = None
):
    query = "INSERT INTO artist (id, name) VALUES (?, ?);"
    values = musicbrainz_artistid, artist

    cursor.execute(query, values)
    connection.commit()

def add_release_group(
    musicbrainz_releasegroupid: str,
    artist_ids: list,
    albumartist: str = None,
    albumsort: int = None,
    musicbrainz_albumtype: str = None,
    compilation: str = None
):
    # add adjacency
    adjacency_list = []
    for artist_id in artist_ids:
        adjacency_list.append((musicbrainz_releasegroupid, artist_id))
    adjacency_values = tuple(adjacency_list)
    adjacency_query = "INSERT INTO artist_release_group (artist_id, release_group_id) VALUES (?, ?);"
    cursor.executemany(adjacency_query, adjacency_values)
    connection.commit()

    # add release group
    query = "INSERT INTO release_group (id, albumartist, albumsort, musicbrainz_albumtype, compilation) VALUES (?, ?, ?, ?, ?);"
    values = musicbrainz_releasegroupid, albumartist, albumsort, musicbrainz_albumtype, compilation
    cursor.execute(query, values)
    connection.commit()

def add_release(
    musicbrainz_albumid: str,
    release_group_id: str,
    title: str = None,
    copyright_: str = None
):
    query = "INSERT INTO release_ (id, release_group_id, title, copyright) VALUES (?, ?, ?, ?);"
    values = musicbrainz_albumid, release_group_id, title, copyright_

    cursor.execute(query, values)
    connection.commit()

if __name__ == "__main__":
    pass