# Copyright 2004-2006 Joe Wreschnig, Michael Urman, Iñigo Serna
#                2014 Nick Boultbee
#                2017 Fredrik Strupe
#
# 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.

from typing import Optional, Type

from gi.repository import Gtk, GObject
from senf import fsn2text

from quodlibet import config
from quodlibet import util
from quodlibet import _
from quodlibet.plugins import PluginHandler
from quodlibet.qltk.ccb import ConfigCheckButton
from quodlibet.qltk.msg import WarningMessage, ErrorMessage
from quodlibet.qltk import Icons
from quodlibet.util import connect_obj, connect_destroy
from quodlibet.errorreport import errorhook


class OverwriteWarning(WarningMessage):

    RESPONSE_SAVE = 1

    def __init__(self, parent, song):
        title = _("Tag may not be accurate")

        fn_format = "<b>%s</b>" % util.escape(fsn2text(song("~basename")))
        description = _("%(file-name)s changed while the program was running. "
            "Saving without refreshing your library may "
            "overwrite other changes to the song.") % {"file-name": fn_format}

        super().__init__(
            parent, title, description, buttons=Gtk.ButtonsType.NONE)

        self.add_button(_("_Cancel"), Gtk.ResponseType.CANCEL)
        self.add_icon_button(_("_Save"), Icons.DOCUMENT_SAVE,
                             self.RESPONSE_SAVE)
        self.set_default_response(Gtk.ResponseType.CANCEL)


class WriteFailedError(ErrorMessage):

    def __init__(self, parent, song):
        title = _("Unable to save song")

        fn_format = "<b>%s</b>" % util.escape(fsn2text(song("~basename")))
        description = _("Saving %(file-name)s failed. The file may be "
            "read-only, corrupted, or you do not have "
            "permission to edit it.") % {"file-name": fn_format}

        super().__init__(
            parent, title, description)


class EditingPluginHandler(GObject.GObject, PluginHandler):
    __gsignals__ = {
        "changed": (GObject.SignalFlags.RUN_LAST, None, ())
    }

    Kind: Optional[Type] = None

    def __init__(self):
        super().__init__()
        self.__plugins = []

    @property
    def plugins(self):
        return list(self.__plugins)

    def plugin_handle(self, plugin):
        return issubclass(plugin.cls, self.Kind)

    def plugin_enable(self, plugin):
        self.__plugins.append(plugin.cls)
        self.changed()

    def plugin_disable(self, plugin):
        self.__plugins.remove(plugin.cls)
        self.changed()

    def changed(self):
        self.emit("changed")


class FilterCheckButton(ConfigCheckButton):
    __gsignals__ = {
        "preview": (GObject.SignalFlags.RUN_LAST, None, ())
        }
    _tooltip = None

    def __init__(self):
        super().__init__(
            self._label, self._section, self._key, tooltip=self._tooltip)
        try:
            self.set_active(config.getboolean(self._section, self._key))
        except:
            pass
        connect_obj(self, 'toggled', self.emit, 'preview')

    @property
    def active(self):
        return self.get_active()

    def filter(self, original, filename):
        raise NotImplementedError

    def filter_list(self, origs, names):
        return list(map(self.filter, origs, names))

    def __lt__(self, other):
        return (self._order, type(self).__name__) < \
            (other._order, type(other).__name__)


class FilterPluginBox(Gtk.VBox):

    __gsignals__ = {
        # the list should be updated
        "changed": (GObject.SignalFlags.RUN_LAST, None, ()),
        # the preview button should be made sensitive
        "preview": (GObject.SignalFlags.RUN_LAST, None, ()),
    }

    def __init__(self, plugin_handler, filter_types=None):
        super().__init__()

        # static filters
        if filter_types is None:
            filter_types = []

        filters = [Kind() for Kind in filter_types]
        filters.sort()
        for f in filters:
            self.pack_start(f, True, True, 0)
        self.__filters = filters

        # plugins
        self.__plugins = []
        hb = Gtk.HBox()
        expander = Gtk.Expander(label=_(u"_More options…"))
        expander.set_use_underline(True)
        expander.set_no_show_all(True)
        hb.pack_start(expander, True, True, 0)
        self.pack_start(hb, False, True, 0)

        for filt in filters:
            filt.connect('preview', lambda *x: self.emit("preview"))

        vbox = Gtk.VBox()
        expander.add(vbox)

        connect_destroy(plugin_handler,
            "changed", self.__refresh_plugins, vbox, expander)

        expander.connect("notify::expanded", self.__notify_expanded, vbox)
        expander.set_expanded(False)

        for child in self.get_children():
            child.show()

        plugin_handler.changed()

    def __notify_expanded(self, expander, event, vbox):
        vbox.set_property('visible', expander.get_property('expanded'))

    def __refresh_plugins(self, handler, vbox, expander):
        instances = []
        for Kind in handler.plugins:
            try:
                f = Kind()
            except:
                errorhook()
                continue
            else:
                instances.append(f)
        instances.sort()

        for child in vbox.get_children():
            child.destroy()
        del self.__plugins[:]

        for f in instances:
            try:
                vbox.pack_start(f, True, True, 0)
            except:
                errorhook()
                f.destroy()
                continue

            try:
                f.connect('preview', lambda *x: self.emit('preview'))
            except:
                try:
                    f.connect('changed', lambda *x: self.emit('changed'))
                except:
                    errorhook()
                    continue

            self.__plugins.append(f)

        vbox.show_all()

        # Don't display the expander if there aren't any plugins.
        if not self.__plugins:
            expander.set_expanded(False)
            expander.hide()
        else:
            expander.show()

    @property
    def filters(self):
        return self.__filters + self.__plugins
