import re
from itertools import groupby
from pathlib import Path
from urllib.parse import quote_plus, unquote

from plexapi import media, utils
from plexapi.base import Playable, PlexPartialObject, cached_data_property
from plexapi.exceptions import BadRequest, NotFound, Unsupported
from plexapi.library import LibrarySection, MusicSection
from plexapi.mixins import PlaylistMixins


@utils.registerPlexObject
class Playlist(
    PlexPartialObject, Playable, PlaylistMixins
):
    """ Represents a single Playlist.

        Attributes:
            TAG (str): 'Playlist'
            TYPE (str): 'playlist'
            addedAt (datetime): Datetime the playlist was added to the server.
            allowSync (bool): True if you allow syncing playlists.
            composite (str): URL to composite image (/playlist/<ratingKey>/composite/<compositeid>)
            content (str): The filter URI string for smart playlists.
            duration (int): Duration of the playlist in milliseconds.
            durationInSeconds (int): Duration of the playlist in seconds.
            fields (List<:class:`~plexapi.media.Field`>): List of field objects.
            guid (str): Plex GUID for the playlist (com.plexapp.agents.none://XXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXX).
            icon (str): Icon URI string for smart playlists.
            key (str): API URL (/playlist/<ratingkey>).
            leafCount (int): Number of items in the playlist view.
            librarySectionID (int): Library section identifier (radio only)
            librarySectionKey (str): Library section key (radio only)
            librarySectionTitle (str): Library section title (radio only)
            playlistType (str): 'audio', 'video', or 'photo'
            radio (bool): If this playlist represents a radio station
            ratingKey (int): Unique key identifying the playlist.
            smart (bool): True if the playlist is a smart playlist.
            summary (str): Summary of the playlist.
            title (str): Name of the playlist.
            titleSort (str): Title to use when sorting (defaults to title).
            type (str): 'playlist'
            updatedAt (datetime): Datetime the playlist was updated.
    """
    TAG = 'Playlist'
    TYPE = 'playlist'

    def _loadData(self, data):
        """ Load attribute values from Plex XML response. """
        Playable._loadData(self, data)
        self.addedAt = utils.toDatetime(data.attrib.get('addedAt'))
        self.allowSync = utils.cast(bool, data.attrib.get('allowSync'))
        self.composite = data.attrib.get('composite')  # url to thumbnail
        self.content = data.attrib.get('content')
        self.duration = utils.cast(int, data.attrib.get('duration'))
        self.durationInSeconds = utils.cast(int, data.attrib.get('durationInSeconds'))
        self.guid = data.attrib.get('guid')
        self.icon = data.attrib.get('icon')
        self.key = data.attrib.get('key', '').replace('/items', '')  # FIX_BUG_50
        self.leafCount = utils.cast(int, data.attrib.get('leafCount'))
        self.librarySectionID = utils.cast(int, data.attrib.get('librarySectionID'))
        self.librarySectionKey = data.attrib.get('librarySectionKey')
        self.librarySectionTitle = data.attrib.get('librarySectionTitle')
        self.playlistType = data.attrib.get('playlistType')
        self.radio = utils.cast(bool, data.attrib.get('radio', 0))
        self.ratingKey = utils.cast(int, data.attrib.get('ratingKey'))
        self.smart = utils.cast(bool, data.attrib.get('smart'))
        self.summary = data.attrib.get('summary')
        self.title = data.attrib.get('title')
        self.titleSort = data.attrib.get('titleSort', self.title)
        self.type = data.attrib.get('type')
        self.updatedAt = utils.toDatetime(data.attrib.get('updatedAt'))

    @cached_data_property
    def fields(self):
        return self.findItems(self._data, media.Field)

    def __len__(self):  # pragma: no cover
        return len(self.items())

    def __iter__(self):  # pragma: no cover
        for item in self.items():
            yield item

    def __contains__(self, other):  # pragma: no cover
        return any(i.key == other.key for i in self.items())

    def __getitem__(self, key):  # pragma: no cover
        return self.items()[key]

    @property
    def thumb(self):
        """ Alias to self.composite. """
        return self.composite

    @property
    def metadataType(self):
        """ Returns the type of metadata in the playlist (movie, track, or photo). """
        if self.isVideo:
            return 'movie'
        elif self.isAudio:
            return 'track'
        elif self.isPhoto:
            return 'photo'
        else:
            raise Unsupported('Unexpected playlist type')

    @property
    def isVideo(self):
        """ Returns True if this is a video playlist. """
        return self.playlistType == 'video'

    @property
    def isAudio(self):
        """ Returns True if this is an audio playlist. """
        return self.playlistType == 'audio'

    @property
    def isPhoto(self):
        """ Returns True if this is a photo playlist. """
        return self.playlistType == 'photo'

    def _getPlaylistItemID(self, item):
        """ Match an item to a playlist item and return the item playlistItemID. """
        for _item in self.items():
            if _item.ratingKey == item.ratingKey:
                return _item.playlistItemID
        raise NotFound(f'Item with title "{item.title}" not found in the playlist')

    @cached_data_property
    def _filters(self):
        """ Cache for filters. """
        return self._parseFilters(self.content)

    def filters(self):
        """ Returns the search filter dict for smart playlist.
            The filter dict be passed back into :func:`~plexapi.library.LibrarySection.search`
            to get the list of items.
        """
        return self._filters

    @cached_data_property
    def _section(self):
        """ Cache for section. """
        if not self.smart:
            raise BadRequest('Regular playlists are not associated with a library.')

        # Try to parse the library section from the content URI string
        match = re.search(r'/library/sections/(\d+)/all', unquote(self.content or ''))
        if match:
            sectionKey = int(match.group(1))
            return self._server.library.sectionByID(sectionKey)

        # Try to get the library section from the first item in the playlist
        if self.items():
            return self.items()[0].section()

        raise Unsupported('Unable to determine the library section')

    def section(self):
        """ Returns the :class:`~plexapi.library.LibrarySection` this smart playlist belongs to.

            Raises:
                :class:`plexapi.exceptions.BadRequest`: When trying to get the section for a regular playlist.
                :class:`plexapi.exceptions.Unsupported`: When unable to determine the library section.
        """
        return self._section

    def item(self, title):
        """ Returns the item in the playlist that matches the specified title.

            Parameters:
                title (str): Title of the item to return.

            Raises:
                :class:`plexapi.exceptions.NotFound`: When the item is not found in the playlist.
        """
        for item in self.items():
            if item.title.lower() == title.lower():
                return item
        raise NotFound(f'Item with title "{title}" not found in the playlist')

    @cached_data_property
    def _items(self):
        """ Cache for items. """
        if self.radio:
            return []

        key = f'{self.key}/items'
        items = self.fetchItems(key)

        # Cache server connections to avoid reconnecting for each item
        _servers = {}
        for item in items:
            if item.sourceURI:
                serverID = item.sourceURI.split('/')[2]
                if serverID not in _servers:
                    try:
                        _servers[serverID] = self._server.myPlexAccount().resource(serverID).connect()
                    except NotFound:
                        # Override the server connection with None if the server is not found
                        _servers[serverID] = None
                item._server = _servers[serverID]

        return items

    def items(self):
        """ Returns a list of all items in the playlist. """
        return self._items

    def get(self, title):
        """ Alias to :func:`~plexapi.playlist.Playlist.item`. """
        return self.item(title)

    def addItems(self, items):
        """ Add items to the playlist.

            Parameters:
                items (List): List of :class:`~plexapi.audio.Audio`, :class:`~plexapi.video.Video`,
                    or :class:`~plexapi.photo.Photo` objects to be added to the playlist.

            Raises:
                :class:`plexapi.exceptions.BadRequest`: When trying to add items to a smart playlist.
        """
        if self.smart:
            raise BadRequest('Cannot add items to a smart playlist.')

        if items and not isinstance(items, (list, tuple)):
            items = [items]

        # Group items by server to maintain order when adding items from multiple servers
        for server, _items in groupby(items, key=lambda item: item._server):

            ratingKeys = []
            for item in _items:
                if item.listType != self.playlistType:  # pragma: no cover
                    raise BadRequest(f'Can not mix media types when building a playlist: '
                                     f'{self.playlistType} and {item.listType}')
                ratingKeys.append(str(item.ratingKey))

            ratingKeys = ','.join(ratingKeys)
            uri = f'{server._uriRoot()}/library/metadata/{ratingKeys}'

            args = {'uri': uri}
            key = f"{self.key}/items{utils.joinArgs(args)}"
            self._server.query(key, method=self._server._session.put)

        return self

    def removeItems(self, items):
        """ Remove items from the playlist.

            Parameters:
                items (List): List of :class:`~plexapi.audio.Audio`, :class:`~plexapi.video.Video`,
                    or :class:`~plexapi.photo.Photo` objects to be removed from the playlist.

            Raises:
                :class:`plexapi.exceptions.BadRequest`: When trying to remove items from a smart playlist.
                :class:`plexapi.exceptions.NotFound`: When the item does not exist in the playlist.
        """
        if self.smart:
            raise BadRequest('Cannot remove items from a smart playlist.')

        if items and not isinstance(items, (list, tuple)):
            items = [items]

        for item in items:
            playlistItemID = self._getPlaylistItemID(item)
            key = f'{self.key}/items/{playlistItemID}'
            self._server.query(key, method=self._server._session.delete)
        return self

    def moveItem(self, item, after=None):
        """ Move an item to a new position in the playlist.

            Parameters:
                items (obj): :class:`~plexapi.audio.Audio`, :class:`~plexapi.video.Video`,
                    or :class:`~plexapi.photo.Photo` objects to be moved in the playlist.
                after (obj): :class:`~plexapi.audio.Audio`, :class:`~plexapi.video.Video`,
                    or :class:`~plexapi.photo.Photo` objects to move the item after in the playlist.

            Raises:
                :class:`plexapi.exceptions.BadRequest`: When trying to move items in a smart playlist.
                :class:`plexapi.exceptions.NotFound`: When the item or item after does not exist in the playlist.
        """
        if self.smart:
            raise BadRequest('Cannot move items in a smart playlist.')

        playlistItemID = self._getPlaylistItemID(item)
        key = f'{self.key}/items/{playlistItemID}/move'

        if after:
            afterPlaylistItemID = self._getPlaylistItemID(after)
            key += f'?after={afterPlaylistItemID}'

        self._server.query(key, method=self._server._session.put)
        return self

    def updateFilters(self, limit=None, sort=None, filters=None, **kwargs):
        """ Update the filters for a smart playlist.

            Parameters:
                limit (int): Limit the number of items in the playlist.
                sort (str or list, optional): A string of comma separated sort fields
                    or a list of sort fields in the format ``column:dir``.
                    See :func:`~plexapi.library.LibrarySection.search` for more info.
                filters (dict): A dictionary of advanced filters.
                    See :func:`~plexapi.library.LibrarySection.search` for more info.
                **kwargs (dict): Additional custom filters to apply to the search results.
                    See :func:`~plexapi.library.LibrarySection.search` for more info.

            Raises:
                :class:`plexapi.exceptions.BadRequest`: When trying update filters for a regular playlist.
        """
        if not self.smart:
            raise BadRequest('Cannot update filters for a regular playlist.')

        section = self.section()
        searchKey = section._buildSearchKey(
            sort=sort, libtype=section.METADATA_TYPE, limit=limit, filters=filters, **kwargs)
        uri = f'{self._server._uriRoot()}{searchKey}'

        args = {'uri': uri}
        key = f"{self.key}/items{utils.joinArgs(args)}"
        self._server.query(key, method=self._server._session.put)
        return self

    def _edit(self, **kwargs):
        """ Actually edit the playlist. """
        if isinstance(self._edits, dict):
            self._edits.update(kwargs)
            return self

        key = f'{self.key}{utils.joinArgs(kwargs)}'
        self._server.query(key, method=self._server._session.put)
        return self

    def delete(self):
        """ Delete the playlist. """
        self._server.query(self.key, method=self._server._session.delete)

    @classmethod
    def _create(cls, server, title, items):
        """ Create a regular playlist. """
        if not items:
            raise BadRequest('Must include items to add when creating new playlist.')

        if items and not isinstance(items, (list, tuple)):
            items = [items]

        listType = items[0].listType
        ratingKeys = []
        for item in items:
            if item.listType != listType:  # pragma: no cover
                raise BadRequest('Can not mix media types when building a playlist.')
            ratingKeys.append(str(item.ratingKey))

        ratingKeys = ','.join(ratingKeys)
        uri = f'{server._uriRoot()}/library/metadata/{ratingKeys}'

        args = {'uri': uri, 'type': listType, 'title': title, 'smart': 0}
        key = f"/playlists{utils.joinArgs(args)}"
        data = server.query(key, method=server._session.post)[0]
        return cls(server, data, initpath=key)

    @classmethod
    def _createSmart(cls, server, title, section, limit=None, libtype=None, sort=None, filters=None, **kwargs):
        """ Create a smart playlist. """
        if not isinstance(section, LibrarySection):
            section = server.library.section(section)

        libtype = libtype or section.METADATA_TYPE

        searchKey = section._buildSearchKey(
            sort=sort, libtype=libtype, limit=limit, filters=filters, **kwargs)
        uri = f'{server._uriRoot()}{searchKey}'

        args = {'uri': uri, 'type': section.CONTENT_TYPE, 'title': title, 'smart': 1}
        key = f"/playlists{utils.joinArgs(args)}"
        data = server.query(key, method=server._session.post)[0]
        return cls(server, data, initpath=key)

    @classmethod
    def _createFromM3U(cls, server, title, section, m3ufilepath):
        """ Create a playlist from uploading an m3u file. """
        if not isinstance(section, LibrarySection):
            section = server.library.section(section)

        if not isinstance(section, MusicSection):
            raise BadRequest('Can only create playlists from m3u files in a music library.')

        args = {'sectionID': section.key, 'path': m3ufilepath}
        key = f"/playlists/upload{utils.joinArgs(args)}"
        server.query(key, method=server._session.post)
        try:
            return server.playlists(sectionId=section.key, guid__endswith=m3ufilepath)[0].editTitle(title).reload()
        except IndexError:
            raise BadRequest('Failed to create playlist from m3u file.') from None

    @classmethod
    def create(cls, server, title, section=None, items=None, smart=False, limit=None,
               libtype=None, sort=None, filters=None, m3ufilepath=None, **kwargs):
        """ Create a playlist.

            Parameters:
                server (:class:`~plexapi.server.PlexServer`): Server to create the playlist on.
                title (str): Title of the playlist.
                section (:class:`~plexapi.library.LibrarySection`, str): Smart playlists and m3u import only,
                    the library section to create the playlist in.
                items (List): Regular playlists only, list of :class:`~plexapi.audio.Audio`,
                    :class:`~plexapi.video.Video`, or :class:`~plexapi.photo.Photo` objects to be added to the playlist.
                smart (bool): True to create a smart playlist. Default False.
                limit (int): Smart playlists only, limit the number of items in the playlist.
                libtype (str): Smart playlists only, the specific type of content to filter
                    (movie, show, season, episode, artist, album, track, photoalbum, photo).
                sort (str or list, optional): Smart playlists only, a string of comma separated sort fields
                    or a list of sort fields in the format ``column:dir``.
                    See :func:`~plexapi.library.LibrarySection.search` for more info.
                filters (dict): Smart playlists only, a dictionary of advanced filters.
                    See :func:`~plexapi.library.LibrarySection.search` for more info.
                m3ufilepath (str): Music playlists only, the full file path to an m3u file to import.
                    Note: This will overwrite any playlist previously created from the same m3u file.
                **kwargs (dict): Smart playlists only, additional custom filters to apply to the
                    search results. See :func:`~plexapi.library.LibrarySection.search` for more info.

            Raises:
                :class:`plexapi.exceptions.BadRequest`: When no items are included to create the playlist.
                :class:`plexapi.exceptions.BadRequest`: When mixing media types in the playlist.
                :class:`plexapi.exceptions.BadRequest`: When attempting to import m3u file into non-music library.
                :class:`plexapi.exceptions.BadRequest`: When failed to import m3u file.

            Returns:
                :class:`~plexapi.playlist.Playlist`: A new instance of the created Playlist.
        """
        if m3ufilepath:
            return cls._createFromM3U(server, title, section, m3ufilepath)
        elif smart:
            if items:
                raise BadRequest('Cannot create a smart playlist with items.')
            return cls._createSmart(server, title, section, limit, libtype, sort, filters, **kwargs)
        else:
            return cls._create(server, title, items)

    def copyToUser(self, user):
        """ Copy playlist to another user account.

            Parameters:
                user (:class:`~plexapi.myplex.MyPlexUser` or str): `MyPlexUser` object, username,
                    email, or user id of the user to copy the playlist to.
        """
        userServer = self._server.switchUser(user)
        return self.create(server=userServer, title=self.title, items=self.items())

    def sync(self, videoQuality=None, photoResolution=None, audioBitrate=None, client=None, clientId=None, limit=None,
             unwatched=False, title=None):
        """ Add the playlist as a sync item for the specified device.
            See :func:`~plexapi.myplex.MyPlexAccount.sync` for possible exceptions.

            Parameters:
                videoQuality (int): idx of quality of the video, one of VIDEO_QUALITY_* values defined in
                                    :mod:`~plexapi.sync` module. Used only when playlist contains video.
                photoResolution (str): maximum allowed resolution for synchronized photos, see PHOTO_QUALITY_* values in
                                       the module :mod:`~plexapi.sync`. Used only when playlist contains photos.
                audioBitrate (int): maximum bitrate for synchronized music, better use one of MUSIC_BITRATE_* values
                                    from the module :mod:`~plexapi.sync`. Used only when playlist contains audio.
                client (:class:`~plexapi.myplex.MyPlexDevice`): sync destination, see
                                                               :func:`~plexapi.myplex.MyPlexAccount.sync`.
                clientId (str): sync destination, see :func:`~plexapi.myplex.MyPlexAccount.sync`.
                limit (int): maximum count of items to sync, unlimited if `None`.
                unwatched (bool): if `True` watched videos wouldn't be synced.
                title (str): descriptive title for the new :class:`~plexapi.sync.SyncItem`, if empty the value would be
                             generated from metadata of current photo.

            Raises:
                :exc:`~plexapi.exceptions.BadRequest`: When playlist is not allowed to sync.
                :exc:`~plexapi.exceptions.Unsupported`: When playlist content is unsupported.

            Returns:
                :class:`~plexapi.sync.SyncItem`: A new instance of the created sync item.
        """
        if not self.allowSync:
            raise BadRequest('The playlist is not allowed to sync')

        from plexapi.sync import SyncItem, Policy, MediaSettings

        myplex = self._server.myPlexAccount()
        sync_item = SyncItem(self._server, None)
        sync_item.title = title if title else self.title
        sync_item.rootTitle = self.title
        sync_item.contentType = self.playlistType
        sync_item.metadataType = self.metadataType
        sync_item.machineIdentifier = self._server.machineIdentifier

        sync_item.location = f'playlist:///{quote_plus(self.guid)}'
        sync_item.policy = Policy.create(limit, unwatched)

        if self.isVideo:
            sync_item.mediaSettings = MediaSettings.createVideo(videoQuality)
        elif self.isAudio:
            sync_item.mediaSettings = MediaSettings.createMusic(audioBitrate)
        elif self.isPhoto:
            sync_item.mediaSettings = MediaSettings.createPhoto(photoResolution)
        else:
            raise Unsupported('Unsupported playlist content')

        return myplex.sync(sync_item, client=client, clientId=clientId)

    def _getWebURL(self, base=None):
        """ Get the Plex Web URL with the correct parameters. """
        return self._server._buildWebURL(base=base, endpoint='playlist', key=self.key)

    @property
    def metadataDirectory(self):
        """ Returns the Plex Media Server data directory where the metadata is stored. """
        guid_hash = utils.sha1hash(self.guid)
        return str(Path('Metadata') / 'Playlists' / guid_hash[0] / f'{guid_hash[1:]}.bundle')