# -*- coding: utf-8; mode: python; -*-
#
#  GStreamer Debug Viewer - View and analyze GStreamer debug log files
#
#  Copyright (C) 2007 René Stadler <mail@renestadler.de>
#
#  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 3 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, see <http://www.gnu.org/licenses/>.

"""GStreamer Debug Viewer GUI module."""

import os.path

from gi.repository import GObject
from gi.repository import Gdk
from gi.repository import Gtk

from GstDebugViewer import Common
from GstDebugViewer.GUI.columns import ViewColumnManager
from GstDebugViewer.GUI.window import Window


class AppStateSection (Common.GUI.StateSection):

    _name = "state"

    geometry = Common.GUI.StateInt4("window-geometry")
    maximized = Common.GUI.StateBool("window-maximized")

    column_order = Common.GUI.StateItemList("column-order", ViewColumnManager)
    columns_visible = Common.GUI.StateItemList(
        "columns-visible", ViewColumnManager)

    zoom_level = Common.GUI.StateInt("zoom-level")


class AppState (Common.GUI.State):

    def __init__(self, *a, **kw):

        Common.GUI.State.__init__(self, *a, **kw)

        self.add_section_class(AppStateSection)


class App (object):

    def __init__(self):

        self.attach()

    def load_plugins(self):

        from GstDebugViewer import Plugins

        plugin_classes = list(
            Plugins.load([os.path.dirname(Plugins.__file__)]))
        self.plugins = []
        for plugin_class in plugin_classes:
            plugin = plugin_class(self)
            self.plugins.append(plugin)

    def iter_plugin_features(self):

        for plugin in self.plugins:
            for feature in plugin.features:
                yield feature

    def attach(self):

        config_home = Common.utils.XDG.CONFIG_HOME

        state_filename = os.path.join(
            config_home, "gst-debug-viewer", "state")

        self.state = AppState(state_filename)
        self.state_section = self.state.sections["state"]

        self.load_plugins()

        self.windows = []

        # Apply custom widget stying
        # TODO: check for dark theme
        css = """
        @define-color normal_bg_color #FFFFFF;
        @define-color shade_bg_color shade(@normal_bg_color, 0.95);
        #log_view row:nth-child(even) {
            background-color: @normal_bg_color;
        }
        #log_view row:nth-child(odd) {
            background-color: @shade_bg_color;
        }
        #log_view row:selected {
            background-color: #4488FF;
        }
        #log_view {
          -GtkTreeView-horizontal-separator: 0;
          -GtkTreeView-vertical-separator: 1;
          outline-width: 0;
          outline-offset: 0;
        }
        """

        style_provider = Gtk.CssProvider()
        style_provider.load_from_data(css)

        Gtk.StyleContext.add_provider_for_screen(
            Gdk.Screen.get_default(),
            style_provider,
            Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
        )

        self.open_window()

    def detach(self):

        # TODO: If we take over deferred saving from the inspector, specify now
        # = True here!
        self.state.save()

    def run(self):

        try:
            Common.Main.MainLoopWrapper(Gtk.main, Gtk.main_quit).run()
        except:
            raise
        else:
            self.detach()

    def open_window(self):

        self.windows.append(Window(self))

    def close_window(self, window):

        self.windows.remove(window)
        if not self.windows:
            # GtkTreeView takes some time to go down for large files.  Let's block
            # until the window is hidden:
            GObject.idle_add(Gtk.main_quit)
            Gtk.main()

            Gtk.main_quit()