# Copyright 2021 (c) Anna Schumaker.
from gi.repository import GObject
from gi.repository import Gtk

class UpDownBox(Gtk.Box):
    def __init__(self):
        Gtk.Box.__init__(self)
        self.append(Gtk.Button.new_from_icon_name("go-up-symbolic"))
        self.append(Gtk.Button.new_from_icon_name("go-down-symbolic"))
        self.add_css_class("linked")

        self.get_first_child().connect("clicked", self.clicked, "move-up")
        self.get_last_child().connect("clicked", self.clicked, "move-down")

        self.get_first_child().set_sensitive(False)
        self.get_last_child().set_sensitive(False)

    def set_active(self, active, first, last):
        self.get_first_child().set_sensitive(active and not first)
        self.get_last_child().set_sensitive(active and not last)

    def clicked(self, button, signal):
        self.emit(signal)

    @GObject.Signal
    def move_up(self): pass

    @GObject.Signal
    def move_down(self): pass


class DirectionButton(Gtk.Button):
    def __init__(self):
        Gtk.Button.__init__(self, sensitive=False)
        self.set_icon_name("view-sort-ascending")

    def set_direction(self, direction, active):
        sort = "ascending" if direction == "ASC" else "descending"
        self.set_icon_name(f"view-sort-{sort}")
        self.set_sensitive(active)


class FieldLabel(Gtk.Label):
    def __init__(self):
        Gtk.Label.__init__(self, sensitive=False, hexpand=True)

    def set_field(self, field, active):
        self.set_sensitive(active)
        self.set_text({ "tracks.number" : "Track Number",
                         "tracks.title" : "Track Title",
                        "tracks.length" : "Track Length",
                         "artists.sort" : "Artist Name",
                          "albums.sort" : "Album Name",
                       "discs.subtitle" : "Disc Subtitle",
                       "albums.release" : "Release Date",
                     "tracks.playcount" : "Play Count",
                    "tracks.lastplayed" : "Last Played",
                   "playlist_map.rowid" : "Order Added"}.get(field, field))

    def get_field(self):
        text = self.get_text()
        return { "Track Number" : "tracks.number",
                  "Track Title" : "tracks.title",
                 "Track Length" : "tracks.length",
                  "Artist Name" : "artists.sort",
                   "Album Name" : "albums.sort",
                "Disc Subtitle" : "discs.subtitle",
                 "Release Date" : "albums.release",
                   "Play Count" : "tracks.playcount",
                  "Last Played" : "tracks.lastplayed",
                  "Order Added" : "playlist_map.rowid"}.get(text, text)


class SortRow(Gtk.Box):
    def __init__(self):
        Gtk.Box.__init__(self, spacing=5)
        self.switch = Gtk.Switch(valign=Gtk.Align.CENTER)
        self.label = FieldLabel()
        self.direction = DirectionButton()
        self.updown = UpDownBox()

        self.append(self.switch)
        self.append(self.label)
        self.append(self.direction)
        self.append(self.updown)

        self.switch.connect("notify::active", self.switch_active)
        self.direction.connect("clicked", self.reverse)
        self.updown.connect("move-up", self.moved_up)
        self.updown.connect("move-down", self.moved_down)

    def set_item(self, text, index, n_active):
        (field, direction) = text.split()
        self.switch.set_active(index < n_active)
        self.switch.set_sensitive("rowid" not in field)
        self.label.set_field(field, index < n_active)
        self.direction.set_direction(direction, index < n_active)
        self.updown.set_active(index < n_active, index == 0,
                               index == n_active - 1)

    def switch_active(self, switch, param): self.emit("switched", switch.get_active())
    def reverse(self, button): self.emit("reversed")
    def moved_up(self, button): self.emit("move-up")
    def moved_down(self, button): self.emit("move-down")

    @GObject.Signal(arg_types=(bool,))
    def switched(self, switch): pass

    @GObject.Signal
    def reversed(self): pass

    @GObject.Signal
    def move_up(self): pass

    @GObject.Signal
    def move_down(self): pass


class Factory(Gtk.SignalListItemFactory):
    def __init__(self, model):
        self.model = model
        Gtk.SignalListItemFactory.__init__(self)
        self.connect("setup", self.setup)
        self.connect("bind", self.bind)
        self.connect("unbind", self.unbind)
        self.connect("teardown", self.teardown)

    def setup(self, factory, listitem):
        listitem.set_child(SortRow())

    def bind(self, factory, listitem):
        child = listitem.get_child()
        child.set_item(listitem.get_item().get_string(),
                       listitem.get_position(),
                       self.model.get_n_enabled())
        child.connect("switched", self.row_switched)
        child.connect("reversed", self.row_reversed)
        child.connect("move-up", self.move_row_up)
        child.connect("move-down", self.move_row_down)

    def unbind(self, factory, listitem):
        child = listitem.get_child()
        child.disconnect_by_func(self.row_switched)
        child.disconnect_by_func(self.row_reversed)
        child.disconnect_by_func(self.move_row_up)
        child.disconnect_by_func(self.move_row_down)

    def teardown(self, factory, listitem):
        listitem.set_child(None)

    def row_switched(self, row, enabled):
        field = row.label.get_field()
        if enabled:
            self.model.enable(field)
            index = self.model.get_enabled_model().get_index(field)
        else:
            index = self.model.get_enabled_model().get_index(field)
            self.model.disable(field)
        if index > 0:
            self.model.emit("items-changed", index - 1, 1, 1)

    def row_reversed(self, row):
        self.model.get_enabled_model().reverse(row.label.get_field())

    def move_row_up(self, row):
        self.model.get_enabled_model().move_up(row.label.get_field())

    def move_row_down(self, row):
        self.model.get_enabled_model().move_down(row.label.get_field())