# main_window.py
#
# Change the look of Adwaita, with ease
# Copyright (C) 2022-2023, Gradience Team
#
# 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 <https://www.gnu.org/licenses/>.

from enum import Enum

from gi.repository import Gtk, Adw, Gio

from gradience.backend.constants import rootdir, app_id, build_type

from gradience.frontend.widgets.shell_theming_group import GradienceShellThemingGroup
from gradience.frontend.widgets.monet_theming_group import GradienceMonetThemingGroup
from gradience.frontend.widgets.palette_shades import GradiencePaletteShades
from gradience.frontend.widgets.error_list_row import GradienceErrorListRow
from gradience.frontend.widgets.option_row import GradienceOptionRow
from gradience.frontend.widgets.theming_empty_group import GradienceEmptyThemingGroup
from gradience.frontend.schemas.preset_schema import preset_schema

from gradience.backend.logger import Logger

logging = Logger()


@Gtk.Template(resource_path=f"{rootdir}/ui/window.ui")
class GradienceMainWindow(Adw.ApplicationWindow):
    __gtype_name__ = "GradienceMainWindow"

    content_colors = Gtk.Template.Child("content-colors")
    content_theming = Gtk.Template.Child("content-theming")
    content_plugins = Gtk.Template.Child("content-plugins")

    toast_overlay = Gtk.Template.Child()

    save_preset_button = Gtk.Template.Child("save-preset-button")
    errors_button = Gtk.Template.Child("errors-button")

    errors_list = Gtk.Template.Child("errors-list")
    presets_dropdown = Gtk.Template.Child("presets-dropdown")
    presets_menu = Gtk.Template.Child("presets-menu")

    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        self.app = Gtk.Application.get_default()
        self.settings = Gio.Settings(app_id)

        self.style_manager = self.app.style_manager

        self.monet_image_file = None

        self.enabled_theme_engines = set(
            self.settings.get_value("enabled-theme-engines").unpack()
        )

        self.setup_signals()
        self.setup()

    def setup_signals(self):
        self.presets_dropdown.get_popover().connect("show",
            self.on_presets_dropdown_activate)

        self.connect("close-request",
            self.on_close_request)

        self.connect("unrealize",
            self.save_window_props)

    def setup(self):
        # Set devel style
        if build_type == "debug":
            self.get_style_context().add_class("devel")

        self.setup_theming_page()
        self.setup_colors_group()

    # TODO: Check if org.freedesktop.portal.Settings portal will allow us to \
    # read org.gnome.desktop.background DConf key
    # FIXME: Find purpose for this snippet
    '''def get_default_wallpaper(self):
        background_settings = Gio.Settings("org.gnome.desktop.background")
        if self.style_manager.get_dark():
            picture_uri = background_settings.get_string("picture-uri-dark")
        else:
            picture_uri = background_settings.get_string("picture-uri")
        logging.debug(picture_uri)
        if picture_uri.startswith("file://"):
            self.monet_image_file = Gio.File.new_for_uri(picture_uri)
        else:
            self.monet_image_file = Gio.File.new_for_path(picture_uri)
        image_basename = self.monet_image_file.get_basename()
        logging.debug(image_basename)
        self.monet_image_file = self.monet_image_file.get_path()
        #self.monet_file_chooser_button.set_label(image_basename)
        #self.monet_file_chooser_button.set_tooltip_text(self.monet_image_file)
        logging.debug(self.monet_image_file)
        # self.on_apply_button_clicked() # Comment out for now, because it always shows
        # that annoying toast on startup'''

    def on_close_request(self, *args):
        if self.app.is_dirty:
            logging.debug("Window close request")
            self.app.show_unsaved_dialog()
            return True
        self.close()

    def save_window_props(self, *args):
        win_size = self.get_default_size()

        self.settings.set_int("window-width", win_size.width)
        self.settings.set_int("window-height", win_size.height)

        self.settings.set_boolean("window-maximized", self.is_maximized())
        self.settings.set_boolean("window-fullscreen", self.is_fullscreen())

    def setup_theming_page(self):
        # TODO: Show fallback page if no theme engines are enabled
        no_engines_label = Gtk.Label.new("No Theme Engines enabled")

        self.setup_empty_page()
        self.setup_shell_group()
        self.setup_monet_group()

    def setup_empty_page(self):
        self.empty_page = GradienceEmptyThemingGroup(self)

        if not self.enabled_theme_engines:
            self.content_theming.add(self.empty_page)

    def setup_shell_group(self):
        self.shell_group = GradienceShellThemingGroup(self)

        if "shell" in self.enabled_theme_engines:
            self.content_theming.add(self.shell_group)

    def setup_monet_group(self):
        self.monet_group = GradienceMonetThemingGroup(self)

        if "monet" in self.enabled_theme_engines:
            self.content_theming.add(self.monet_group)

    def reload_theming_page(self):
        if self.shell_group.is_ancestor(self.content_theming):
            self.content_theming.remove(self.shell_group)

        if self.monet_group.is_ancestor(self.content_theming):
            self.content_theming.remove(self.monet_group)

        if self.empty_page.is_ancestor(self.content_theming):
            self.content_theming.remove(self.empty_page)

        self.setup_shell_group()
        self.setup_monet_group()
        self.setup_empty_page()

    def setup_colors_group(self):
        for group in preset_schema["groups"]:
            pref_group = Adw.PreferencesGroup()
            pref_group.set_name(group["name"])
            pref_group.set_title(group["title"])
            pref_group.set_description(group["description"])

            for variable in group["variables"]:
                pref_variable = GradienceOptionRow(
                    variable["name"],
                    variable["title"],
                    variable.get("explanation"),
                    variable["adw_gtk3_support"],
                )
                pref_group.add(pref_variable)

                pref_variable.connect_signals(update_vars=True)
                self.app.pref_variables[variable["name"]] = pref_variable

            self.content_colors.add(pref_group)

        palette_pref_group = Adw.PreferencesGroup()
        palette_pref_group.set_name("palette_colors")
        palette_pref_group.set_title(_("Palette Colors"))
        palette_pref_group.set_description(
            _(
                "Named palette colors used by some applications. Default "
                "colors follow the "
                '<a href="https://developer.gnome.org/hig/reference/palette.html">'
                "GNOME Human Interface Guidelines</a>."
            )
        )
        for color in preset_schema["palette"]:
            palette_shades = GradiencePaletteShades(
                color["prefix"], color["title"], color["n_shades"]
            )
            palette_pref_group.add(palette_shades)
            self.app.pref_palette_shades[color["prefix"]] = palette_shades
        self.content_colors.add(palette_pref_group)

    def update_errors(self, errors):
        child = self.errors_list.get_row_at_index(0)
        while child is not None:
            self.errors_list.remove(child)
            child = self.errors_list.get_row_at_index(0)
        self.errors_button.set_visible(len(errors) > 0)
        for error in errors:
            self.errors_list.append(
                GradienceErrorListRow(error["error"], error["element"], error["line"])
            )

    def on_presets_dropdown_activate(self, *args):
        self.app.reload_user_defined_presets()