#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import absolute_import, division, unicode_literals
from logging import getLogger

from . import common
from .. import utils, variables as v

LOG = getLogger('PLEX.kodi_db.music')


class KodiMusicDB(common.KodiDBBase):
    db_kind = 'music'

    def __enter__(self):
        self.kodiconn = utils.kodi_sql('music')
        self.cursor = self.kodiconn.cursor()
        return self

    def add_music_path(self, path, hash_string=None):
        """
        Add the path (unicode) to the music DB, if it does not exist already.
        Returns the path id
        Set hash_string to something unicode to set the strHash attribute
        """
        # SQL won't return existing paths otherwise
        path = '' if path is None else path
        self.cursor.execute('SELECT idPath FROM path WHERE strPath = ?',
                            (path,))
        try:
            pathid = self.cursor.fetchone()[0]
        except TypeError:
            self.cursor.execute("SELECT COALESCE(MAX(idPath),0) FROM path")
            pathid = self.cursor.fetchone()[0] + 1
            self.cursor.execute('''
                                INSERT INTO path(idPath, strPath, strHash)
                                VALUES (?, ?, ?)
                                ''',
                                (pathid, path, hash_string))
        return pathid

    def music_id_from_filename(self, filename, path):
        """
        Returns the Kodi song_id from the Kodi music database or None if not
        found OR something went wrong.
        """
        self.cursor.execute('SELECT idPath FROM path WHERE strPath = ?',
                            (path,))
        path_ids = self.cursor.fetchall()
        if len(path_ids) != 1:
            LOG.debug('Found wrong number of path ids: %s for path %s, abort',
                      path_ids, path)
            return
        self.cursor.execute('SELECT idSong FROM song WHERE strFileName = ? AND idPath = ?',
                            (filename, path_ids[0][0]))
        song_ids = self.cursor.fetchall()
        if len(song_ids) != 1:
            LOG.info('Found wrong number of songs %s, abort', song_ids)
            return
        return song_ids[0][0]

    def delete_song_from_song_artist(self, song_id):
        """
        Deletes son from song_artist table and possibly orphaned roles
        """
        self.cursor.execute('SELECT idArtist, idRole FROM song_artist WHERE idSong = ? LIMIT 1',
                            (song_id, ))
        artist = self.cursor.fetchone()
        if artist is None:
            # No entry to begin with
            return
        # Delete the entry
        self.cursor.execute('DELETE FROM song_artist WHERE idSong = ?',
                            (song_id, ))
        # Check whether we need to delete orphaned roles
        self.cursor.execute('SELECT idRole FROM song_artist WHERE idRole = ? LIMIT 1',
                            (artist[1], ))
        if not self.cursor.fetchone():
            # Delete orphaned role
            self.cursor.execute('DELETE FROM role WHERE idRole = ?',
                                (artist[1], ))

    def delete_album_from_discography(self, album_id):
        """
        Removes the album with id album_id from the table discography
        """
        # Need to get the album name as a string first!
        self.cursor.execute('SELECT strAlbum, iYear FROM album WHERE idAlbum = ? LIMIT 1',
                            (album_id, ))
        try:
            name, year = self.cursor.fetchone()
        except TypeError:
            return
        self.cursor.execute('SELECT idArtist FROM album_artist WHERE idAlbum = ? LIMIT 1',
                            (album_id, ))
        artist = self.cursor.fetchone()
        if not artist:
            return
        self.cursor.execute('DELETE FROM discography WHERE idArtist = ? AND strAlbum = ? AND strYear = ?',
                            (artist[0], name, year))

    def delete_song_from_song_genre(self, song_id):
        """
        Deletes the one entry with id song_id from the song_genre table.
        Will also delete orphaned genres from genre table
        """
        self.cursor.execute('SELECT idGenre FROM song_genre WHERE idSong = ?',
                            (song_id, ))
        genres = self.cursor.fetchall()
        self.cursor.execute('DELETE FROM song_genre WHERE idSong = ?',
                            (song_id, ))
        # Check for orphaned genres in both song_genre and album_genre tables
        for genre in genres:
            self.cursor.execute('SELECT idGenre FROM song_genre WHERE idGenre = ? LIMIT 1',
                                (genre[0], ))
            if not self.cursor.fetchone():
                self.cursor.execute('SELECT idGenre FROM album_genre WHERE idGenre = ? LIMIT 1',
                                    (genre[0], ))
                if not self.cursor.fetchone():
                    self.cursor.execute('DELETE FROM genre WHERE idGenre = ?',
                                        (genre[0], ))

    def delete_album_from_album_genre(self, album_id):
        """
        Deletes the one entry with id album_id from the album_genre table.
        Will also delete orphaned genres from genre table
        """
        self.cursor.execute('SELECT idGenre FROM album_genre WHERE idAlbum = ?',
                            (album_id, ))
        genres = self.cursor.fetchall()
        self.cursor.execute('DELETE FROM album_genre WHERE idAlbum = ?',
                            (album_id, ))
        # Check for orphaned genres in both album_genre and song_genre tables
        for genre in genres:
            self.cursor.execute('SELECT idGenre FROM album_genre WHERE idGenre = ? LIMIT 1',
                                (genre[0], ))
            if not self.cursor.fetchone():
                self.cursor.execute('SELECT idGenre FROM song_genre WHERE idGenre = ? LIMIT 1',
                                    (genre[0], ))
                if not self.cursor.fetchone():
                    self.cursor.execute('DELETE FROM genre WHERE idGenre = ?',
                                        (genre[0], ))

    def add_album(self, name, musicbrainz):
        """
        Adds a single album to the DB
        """
        self.cursor.execute('SELECT idAlbum FROM album WHERE strMusicBrainzAlbumID = ?',
                            (musicbrainz, ))
        try:
            albumid = self.cursor.fetchone()[0]
        except TypeError:
            # Create the album
            self.cursor.execute('SELECT COALESCE(MAX(idAlbum),0) FROM album')
            albumid = self.cursor.fetchone()[0] + 1
            self.cursor.execute('''
                INSERT INTO album(
                    idAlbum,
                    strAlbum,
                    strMusicBrainzAlbumID,
                    strReleaseType)
                VALUES (?, ?, ?, ?)
            ''', (albumid, name, musicbrainz, 'album'))
        return albumid

    def add_music_genres(self, kodiid, genres, mediatype):
        """
        Adds a list of genres (list of unicode) for a certain Kodi item
        """
        if mediatype == "album":
            # Delete current genres for clean slate
            self.cursor.execute('DELETE FROM album_genre WHERE idAlbum = ?',
                                (kodiid, ))
            for genre in genres:
                self.cursor.execute('SELECT idGenre FROM genre WHERE strGenre = ?',
                                    (genre, ))
                try:
                    genreid = self.cursor.fetchone()[0]
                except TypeError:
                    # Create the genre
                    self.cursor.execute('SELECT COALESCE(MAX(idGenre),0) FROM genre')
                    genreid = self.cursor.fetchone()[0] + 1
                    self.cursor.execute('INSERT INTO genre(idGenre, strGenre) VALUES(?, ?)',
                                        (genreid, genre))
                self.cursor.execute('''
                    INSERT OR REPLACE INTO album_genre(
                        idGenre,
                        idAlbum)
                    VALUES (?, ?)
                ''', (genreid, kodiid))
        elif mediatype == "song":
            # Delete current genres for clean slate
            self.cursor.execute('DELETE FROM song_genre WHERE idSong = ?',
                                (kodiid, ))
            for genre in genres:
                self.cursor.execute('SELECT idGenre FROM genre WHERE strGenre = ?',
                                    (genre, ))
                try:
                    genreid = self.cursor.fetchone()[0]
                except TypeError:
                    # Create the genre
                    self.cursor.execute('SELECT COALESCE(MAX(idGenre),0) FROM genre')
                    genreid = self.cursor.fetchone()[0] + 1
                    self.cursor.execute('INSERT INTO genre(idGenre, strGenre) values(?, ?)',
                                        (genreid, genre))
                self.cursor.execute('''
                    INSERT OR REPLACE INTO song_genre(
                        idGenre,
                        idSong)
                    VALUES (?, ?)
                ''', (genreid, kodiid))

    def add_artist(self, name, musicbrainz):
        """
        Adds a single artist's name to the db
        """
        self.cursor.execute('''
            SELECT idArtist, strArtist
            FROM artist
            WHERE strMusicBrainzArtistID = ?
        ''', (musicbrainz, ))
        try:
            result = self.cursor.fetchone()
            artistid = result[0]
            artistname = result[1]
        except TypeError:
            self.cursor.execute('SELECT idArtist FROM artist WHERE strArtist = ? COLLATE NOCASE',
                                (name, ))
            try:
                artistid = self.cursor.fetchone()[0]
            except TypeError:
                # Krypton has a dummy first entry idArtist: 1  strArtist:
                # [Missing Tag] strMusicBrainzArtistID: Artist Tag Missing
                self.cursor.execute('SELECT COALESCE(MAX(idArtist),1) FROM artist')
                artistid = self.cursor.fetchone()[0] + 1
                self.cursor.execute('''
                    INSERT INTO artist(
                        idArtist,
                        strArtist,
                        strMusicBrainzArtistID)
                    VALUES (?, ?, ?)
                ''', (artistid, name, musicbrainz))
        else:
            if artistname != name:
                self.cursor.execute('UPDATE artist SET strArtist = ? WHERE idArtist = ?',
                                    (name, artistid,))
        return artistid