#
#    Copyright (C) 2009 Anton Khirnov <wyskas@gmail.com>
#
#    Nephilim 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 3 of the License, or
#    (at your option) any later version.
#
#    Nephilim 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 Nephilim.  If not, see <http://www.gnu.org/licenses/>.
#

from PyQt4 import QtGui, QtCore

from ..plugin import Plugin

class Songinfo(Plugin):
    # public, const
    info = 'Displays song metadata provided by MPD.'

    # public, read-only
    o    = None
    tags = None

    # private
    DEFAULTS = {'tagtypes' : ['track', 'title', 'artist', 'album',
                             'albumartist', 'disc', 'genre', 'date', 'composer', 'performer', 'file']}

    #### public ####
    def __init__(self, parent, mpclient, name):
        Plugin.__init__(self, parent, mpclient, name)

        self.__tags = []

    def _load(self):
        self.o = SonginfoWidget(self)
        self.mpclient.song_changed.connect(self.refresh)
        self.mpclient.connect_changed.connect(self.update_tagtypes)

        if self.mpclient.is_connected():
            self.update_tagtypes()
            self.refresh()

    def _unload(self):
        self.mpclient.song_changed.disconnect(self.refresh)
        self.mpclient.connect_changed.disconnect(self.update_tagtypes)
        self.o = None

    def _get_dock_widget(self):
        return self._create_dock(self.o)

    def get_settings_widget(self):
        return SettingsWidgetSonginfo(self)

    def update_tagtypes(self):
        self.__tags = [tag for tag in self.settings.value(self.name + '/tagtypes') if tag in self.mpclient.tagtypes]
        self.o.set_tagtypes(self.__tags)
    def refresh(self):
        self.logger.info('Refreshing.')
        metadata = {}
        song = self.mpclient.cur_song

        if not song:
            return self.o.clear()

        for tag in self.__tags:
            metadata[tag] = song[tag] if tag in song else ''
        self.o.set_metadata(metadata)

class SonginfoWidget(QtGui.QWidget):
    plugin   = None
    __labels = None

    def __init__(self, plugin):
        QtGui.QWidget.__init__(self)
        self.plugin  = plugin
        self.__labels = {}
        self.setLayout(QtGui.QGridLayout())
        self.layout().setColumnStretch(1, 1)

    def set_tagtypes(self, tagtypes):
        """Setup labels for each tagtype in the list."""
        for i in range(self.layout().rowCount()):
            it  = self.layout().itemAtPosition(i, 0)
            it1 = self.layout().itemAtPosition(i, 1)
            if it:
                self.layout().removeItem(it)
                it.widget().setParent(None)
            if it1:
                self.layout().removeItem(it1)
                it1.widget().setParent(None)
        self.__labels = {}

        for tag in tagtypes:
            label  = QtGui.QLabel('<b>%s</b>'%tag)   #TODO sort known tags
            label1 = QtGui.QLabel()                          # tag value will go here
            label1.setTextInteractionFlags(QtCore.Qt.TextSelectableByMouse)
            label.setWordWrap(True)
            label1.setWordWrap(True)
            self.layout().addWidget(label, len(self.__labels), 0, QtCore.Qt.AlignRight)
            self.layout().addWidget(label1, len(self.__labels), 1)
            self.__labels[tag] = label1

    def set_metadata(self, metadata):
        """Set displayed metadata, which is provided in a dict of { tag : value }."""
        for tag in metadata:
            self.__labels[tag].setText(metadata[tag])

    def clear(self):
        """ Clear displayed metadata. """
        for label in self.__labels.values():
            label.clear()

class SettingsWidgetSonginfo(Plugin.SettingsWidget):
    # private
    taglist = None

    def __init__(self, plugin):
        Plugin.SettingsWidget.__init__(self, plugin)
        self.settings.beginGroup(self.plugin.name)

        self.taglist = QtGui.QListWidget(self)
        self.taglist.setDragDropMode(QtGui.QAbstractItemView.InternalMove)
        self.__update_tags()
        self.plugin.mpclient.connect_changed.connect(self.__update_tags)

        self.setLayout(QtGui.QVBoxLayout())
        self._add_widget(self.taglist, label = 'Tags', tooltip = 'A list of tags that should be displayed.\n'
                                  'Use drag and drop to change their order')


    def __update_tags(self):
        self.taglist.setEnabled(self.plugin.mpclient.is_connected())
        if not self.plugin.mpclient.is_connected():
            return

        self.taglist.clear()
        tags_enabled = self.settings.value('tagtypes')
        tags         = self.plugin.mpclient.tagtypes
        for tag in [tag for tag in tags_enabled if tag in tags]:
            it = QtGui.QListWidgetItem(tag)
            it.setCheckState(QtCore.Qt.Checked)
            self.taglist.addItem(it)
        for tag in [tag for tag in tags if tag not in tags_enabled]:
            it = QtGui.QListWidgetItem(tag)
            it.setCheckState(QtCore.Qt.Unchecked)
            self.taglist.addItem(it)

    def save_settings(self):
        if not self.taglist.isEnabled():
            return

        tags = []
        for i in range(self.taglist.count()):
            it = self.taglist.item(i)
            if it.checkState() == QtCore.Qt.Checked:
                tags.append(it.text())
        self.settings.setValue('tagtypes', tags)

        self.plugin.update_tagtypes()
        self.plugin.refresh()