# Miro - an RSS based video player application
# Copyright (C) 2005-2010 Participatory Culture Foundation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
#
# In addition, as a special exception, the copyright holders give
# permission to link the code of portions of this program with the OpenSSL
# library.
#
# You must obey the GNU General Public License in all respects for all of
# the code used other than OpenSSL. If you modify file(s) with this
# exception, you may extend this exception to your version of the file(s),
# but you are not obligated to do so. If you do not wish to do so, delete
# this exception statement from your version. If you delete this exception
# statement from all source files in the program, then also delete it here.

"""``miro.folder`` -- Holds ``Folder`` class and related things.
"""

from miro import feed
from miro import playlist
from miro import util
from miro.database import DDBObject, ObjectNotFoundError
from miro.databasehelper import make_simple_get_set

class FolderBase(DDBObject):
    """Base class for ChannelFolder and Playlist folder classes."""

    def setup_new(self, title):
        self.title = title
        self.expanded = True

    get_title, set_title = make_simple_get_set('title')

    def getExpanded(self):
        self.confirm_db_thread()
        return self.expanded

    def setExpanded(self, newExpanded):
        self.confirm_db_thread()
        self.expanded = newExpanded
        self.signal_change()
        for child in self.getChildrenView():
            child.signal_change(needs_save=False)

    def remove(self, moveItemsTo=None):
        """Remove this folder and children.
        """
        raise NotImplementedError()

    # get_folder and set_folder are here so that channels/playlists and folders
    # have a consistent API.  They don't do much since we don't allow nested
    # folders.
    def get_folder(self):
        return None

    def set_folder(self, newFolder, signal_items=False):
        if newFolder is not None:
            raise TypeError("Nested folders not allowed")

    def getChildrenView(self):
        """Return the children of this folder."""
        raise NotImplementedError()

class ChannelFolder(FolderBase):
    def setup_new(self, title, section=u'video'):
        self.section = section
        FolderBase.setup_new(self, title)

    def remove(self, moveItemsTo=None):
        children = list(self.getChildrenView())
        for child in children:
            if child.is_watched_folder():
                child.setVisible(False) # just hide watched folders
                child.set_folder(None)
            else:
                child.remove(moveItemsTo)
        DDBObject.remove(self)

    @classmethod
    def video_view(cls):
        return cls.make_view("section='video'")

    @classmethod
    def audio_view(cls):
        return cls.make_view("section='audio'")

    @classmethod
    def get_by_title(cls, title):
        return cls.make_view('title=?', (title,)).get_singleton()

    def getChildrenView(self):
        return feed.Feed.folder_view(self.id)

    def hasDownloadedItems(self):
        for feed in self.getChildrenView():
            if feed.hasDownloadedItems():
                return True
        return False

    def hasDownloadingItems(self):
        for feed in self.getChildrenView():
            if feed.hasDownloadingItems():
                return True
        return False

    # Returns string with number of unwatched videos in feed
    def num_unwatched(self):
        unwatched = 0
        for child in self.getChildrenView():
            unwatched += child.num_unwatched()
        return unwatched

    # Returns string with number of available videos in feed
    def num_available(self):
        available = 0
        for child in self.getChildrenView():
            available += child.num_available()
        return available

    def mark_as_viewed(self):
        for child in self.getChildrenView():
            child.mark_as_viewed()

class PlaylistFolderItemMap(playlist.PlaylistItemMap):
    """Single row in the map that associates playlist folders with their 
    child items.
    """
    def setup_new(self, playlist_id, item_id):
        playlist.PlaylistItemMap.setup_new(self, playlist_id, item_id)
        self.count = 1

    def inc_count(self):
        self.count += 1
        self.signal_change()

    def dec_count(self):
        if self.count > 1:
            self.count -= 1
            self.signal_change()
        else:
            self.remove()

    @classmethod
    def add_item_id(cls, playlist_id, item_id):
        view = cls.make_view('playlist_id=? AND item_id=?',
                (playlist_id, item_id))
        try:
            map = view.get_singleton()
            map.inc_count()
        except ObjectNotFoundError:
            cls(playlist_id, item_id)

    @classmethod
    def remove_item_id(cls, playlist_id, item_id):
        view = cls.make_view('playlist_id=? AND item_id=?',
                (playlist_id, item_id))
        map = view.get_singleton()
        map.dec_count()

class PlaylistFolder(FolderBase, playlist.PlaylistMixin):
    MapClass = PlaylistFolderItemMap

    def remove(self, moveItemsTo=None):
        children = list(self.getChildrenView())
        for child in children:
            child.remove(moveItemsTo)
        DDBObject.remove(self)

    def getChildrenView(self):
        return playlist.SavedPlaylist.folder_view(self.id)
