# Copyright 2021 (c) Anna Schumaker.
#
# Table: playlists
# +------   ---+-----------+------+------+
# | playlistid | plstateid | name | sort |
# +--------   -+-----------+------+------+
from gi.repository import GObject
from . import playlist
from . import sql
from . import state
from . import track


class Collection(playlist.Playlist):
    def __init__(self, row):
        playlist.Playlist.__init__(self, row, "media-playback-start")
        self._name = row["name"]

    def get_n_tracks(self):
        cur = sql.execute("SELECT COUNT(*) FROM tracks "
                          "JOIN libraries USING(libraryid) WHERE enabled=1")
        return cur.fetchone()[0]

    def get_track(self, n):
        order = ', '.join(self.plist_state.sort)
        row = sql.execute(f"SELECT * FROM tracks "
                          f"INNER JOIN artists USING(artistid) "
                          f"INNER JOIN albums USING(albumid) "
                          f"INNER JOIN discs USING(discid) "
                          f"INNER JOIN libraries USING(libraryid) "
                          f"WHERE libraries.enabled=1 "
                          f"ORDER BY {order} LIMIT 1 OFFSET ?",
                          [ n ]).fetchone()
        return track.Table.factory(row)

    def get_tracks(self):
        order = ', '.join(self.plist_state.sort)
        rows = sql.execute(f"SELECT * FROM tracks "
                           f"INNER JOIN artists USING(artistid) "
                           f"INNER JOIN albums USING(albumid) "
                           f"INNER JOIN discs USING(discid) "
                           f"INNER JOIN libraries USING(libraryid) "
                           f"WHERE libraries.enabled=1 "
                           f"ORDER BY {order}").fetchall()
        return [ track.Table.factory(row) for row in rows ]

    def get_track_index(self, track):
        order = ', '.join(self.plist_state.sort)
        cur = sql.execute(f"SELECT * FROM (SELECT trackid,ROW_NUMBER() "
                                         f"OVER (ORDER BY {order}) "
                                         f"FROM tracks "
                                         f"INNER JOIN artists USING(artistid) "
                                         f"INNER JOIN albums USING(albumid) "
                                         f"INNER JOIN discs USING(discid) "
                                         f"INNER JOIN libraries USING(libraryid) "
                                         f"WHERE libraries.enabled=1) "
                          f"WHERE trackid=?", [ track.rowid ])
        return cur.fetchone()[1] - 1

    @GObject.Property
    def name(self): return self._name


class UserPlaylist(playlist.MappedPlaylist):
    def __init__(self, row, icon_name, map_table):
        playlist.MappedPlaylist.__init__(self, row, icon_name, map_table)
        self._name = row["name"]

    def delete(self):
        self.clear()
        Table.delete(self)
        sql.commit()

    @GObject.Property
    def name(self): return self._name


class Previous(UserPlaylist):
    def __init__(self, row):
        UserPlaylist.__init__(self, row, "media-skip-backward", "temp_playlist_map")

    def add_track(self, track):
        if self.get_track_index(track):
            self.remove_track(track)
        super().add_track(track)
        self.current = 0
        return True

    def next_track(self):
        self.current = max(-1, self.current - 1)
        return self.get_current_track()

    def previous_track(self):
        return super().next_track()


class QueuedTracks(UserPlaylist):
    def __init__(self, row):
        UserPlaylist.__init__(self, row, "media-skip-forward", "playlist_map")

    def next_track(self):
        if track := super().next_track():
            self.remove_track(track)
        return track


class UserTable(playlist.Model):
    def __init__(self):
        playlist.Model.__init__(self, "playlists", "sort")

    def do_create(self):
        sql.execute("CREATE TABLE IF NOT EXISTS playlists "
                       "(playlistid INTEGER PRIMARY KEY, "
                       " plstateid INTEGER NOT NULL, "
                       " name TEXT UNIQUE, "
                       " sort TEXT, "
                       " FOREIGN KEY (plstateid) REFERENCES playlist_states(plstateid))")
        sql.execute(f"CREATE TABLE IF NOT EXISTS playlist_map "
                       "(playlistid INTEGER, "
                       " trackid INTEGER, "
                       " FOREIGN KEY(playlistid) REFERENCES playlists(playlistid), "
                       " FOREIGN KEY(trackid) REFERENCES tracks(trackid), "
                       " UNIQUE(playlistid, trackid))")
        sql.execute(f"CREATE TEMPORARY TABLE IF NOT EXISTS temp_playlist_map "
                       "(playlistid INTEGER, "
                       " trackid INTEGER, "
                       " FOREIGN KEY(playlistid) REFERENCES playlists(playlistid), "
                       " FOREIGN KEY(trackid) REFERENCES tracks(trackid), "
                       " UNIQUE(playlistid, trackid))")

        self.find("Collection", loop=True)
        self.find("Favorites")
        self.find("New Tracks")
        self.find("Previous", sort=["temp_playlist_map.rowid DESC"])
        self.find("Queued Tracks", sort=["playlist_map.rowid ASC"])

    def do_drop(self):
        sql.execute("DROP TABLE playlists")
        sql.execute("DROP TABLE playlist_map")
        sql.execute("DROP TABLE temp_playlist_map")

    def do_factory(self, row):
        match row["name"]:
            case "Collection":
                return Collection(row)
            case "Favorites":
                return UserPlaylist(row, "emmental-favorites", "playlist_map")
            case "New Tracks":
                return UserPlaylist(row, "starred", "temp_playlist_map")
            case "Previous":
                return Previous(row)
            case "Queued Tracks":
                return QueuedTracks(row)
            case _:
                return UserPlaylist(row, "audio-x-generic", "playlist_map")

    def do_insert(self, plstate, name):
        return sql.execute("INSERT INTO playlists (plstateid, name, sort) "
                           "VALUES (?, ?, ?)", [ plstate.rowid, name, name.casefold() ])

    def do_lookup(self, name):
        return sql.execute("SELECT * FROM playlists WHERE name=?", [ name ])

    def find(self, name, loop=False, sort=state.DefaultSort):
        if (res := self.lookup(name)) == None:
            res = self.insert(name, loop=loop, sort=sort)
        return res


Table = UserTable()