import time

import vlc
from path import Path

from core import logging_
from core.exceptions import NotSupportedFile
from core.file_utilities import is_media_file_ext, hash_file
from core.logging_ import Logger
from core.models import Track
from core.repositories import MusicFolderRepository, TrackRepository

logger = Logger.get()


class Indexation:
    def __init__(self):
        self.started = False
        self.music_folder_repo = MusicFolderRepository()
        self.track_repo = TrackRepository()
        self.music_folders = []
        self.index = {}
        self.processed = set()
        self.t0 = time.time()

    def index_file(self, music_folder, filename, force_update=False):
        filename = Path(filename)
        if not filename.exists():
            raise FileNotFoundError(f"File not found: {filename}")
        if not is_media_file_ext(filename.ext):
            raise NotSupportedFile(f"File's extension {filename.ext} is not supported")

        vlc_media = vlc.Media(filename)
        vlc_media.parse()
        track_infos = vlc_media.get_tracks_info()

        track_hash = hash_file(filename)

        if track_hash in self.processed:
            print(" ... file already indexed, ignore: ", filename)
            return

        if self.index and track_hash in self.index:
            track = self.index[track_hash]
        else:
            track = next(iter(self.track_repo.get_by('hash', track_hash)), None) or Track()

        if track.id and not force_update:
            return track

        track.profile_id = 0
        track.music_folder_id = music_folder.id
        track.title = vlc_media.get_meta(vlc.Meta.Title)
        track.format = filename.ext
        track.artist = vlc_media.get_meta(vlc.Meta.AlbumArtist) or vlc_media.get_meta(vlc.Meta.Artist)
        track.album = vlc_media.get_meta(vlc.Meta.Album)
        track.track_num = vlc_media.get_meta(vlc.Meta.TrackNumber)
        # track.year = vlc_media.get_meta(vlc.Meta.Date)
        # track.duration = vlc_media.get_meta(vlc.Meta.Date)
        # track.size = 0
        track.note = ""
        track.status = Track.STATUS_FOUND
        track.path = filename
        track.hash = track_hash

        if track.id is not None:
            self.track_repo.update(track)
            logger.debug('Index - updated: %s' % filename)
        else:
            self.track_repo.create(track)
            logger.debug('Index - created: %s' % filename)
        self.track_repo.commit()

        return track

    def index_all(self, filter_music_folder_id=None, force_update=False):
        self.index = {t.hash: t for t in self.track_repo.get_all()}
        self.processed = set()
        self.t0 = time.time()
        self.started = True

        if filter_music_folder_id:
            music_folders = [self.music_folder_repo.get_by_id(filter_music_folder_id)]
        else:
            music_folders = self.music_folder_repo.get_all()

        # add and update tracks
        for music_folder in music_folders:
            music_folder_path = Path(music_folder.path)

            for filename in music_folder_path.walkfiles():
                if not is_media_file_ext(filename.ext):
                    continue
                track = self.index_file(music_folder, filename, force_update=force_update)
                self.processed.add(track.hash)

        # mark missings
        for hash_, track in self.index.items():
            if hash_ in self.processed:
                continue
            track.status = Track.STATUS_UNAVAILABLE
            self.track_repo.update(track, True)
            logger.debug('Index - marked as unavailable: %s' % track.path)


class Indexer:

    @staticmethod
    def index_file(music_folder, path, force_update=False):
        indexation = Indexation()
        indexation.index_file(music_folder, path, force_update=force_update)

    @staticmethod
    def index_folder(music_folder, force_update=False):
        logger.debug('** Start indexation on folder %s' % music_folder.id)
        indexation = Indexation()
        indexation.index_all(filter_music_folder_id=music_folder.id, force_update=force_update)

    @staticmethod
    def index_all(force_update=False):
        logger.debug('** Start complete indexation')
        indexation = Indexation()
        indexation.index_all(force_update=force_update)


if __name__ == '__main__':
    Indexer.index_all()