# main.py
#
# Copyright (C) 2022 Libre en Communs <contact@a-lec.org>
# Copyright (C) 2022 Adrien Bourmault <neox@a-lec.org>
# Copyright (C) 2022 Jean Sirmai <jean@a-lec.org>
#
# 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/>.

import sys
import gi

gi.require_version('Gtk', '4.0')
gi.require_version('Adw', '1')

from gi.repository import Gtk, Gio, Adw
from .window import GemGraphWindow, AboutDialog


ENABLE = True
DISABLE = False


class GemGraphApplication(Adw.Application):
    """The main application singleton class."""

    def __init__(self):
        super().__init__(application_id='org.example.App',
                         flags=Gio.ApplicationFlags.FLAGS_NONE)

        # Create base actions
        self.create_action('quit', self.quit, ENABLE, ['<primary>q'])
        self.create_action('about', self.on_about_action, ENABLE)
        self.create_action('preferences', self.on_preferences_action, ENABLE)
        self.create_action('togglesidebar', self.on_togglesidebar_action, ENABLE)

        # Create later actions (mode)
        self.editmode_action = \
            self.create_action(
                'editmode',
                self.on_editmode_action,
                DISABLE,
                ['<primary>e'])

        self.runmode_action = \
            self.create_action(
                'runmode',
                self.on_runmode_action,
                DISABLE,
                ['<primary>r'])

        self.presentmode_action = \
            self.create_action(
                'presentmode',
                self.on_presentmode_action,
                DISABLE,
                ['<primary>p'])

        # Create file actions
        self.create_action('openfile', self.do_open, ENABLE)

        self.close_action = \
            self.create_action(
                'closefile',
                self.on_close_action,
                DISABLE)

        self.save_action = \
            self.create_action(
                'savefile',
                self.on_save_action,
                DISABLE,
                ['<primary>s'])

    def do_activate(self):
        """Called when the application is activated.

        We raise the application's main window, creating it if
        necessary.
        """
        print("app.do_activate called")
        win = self.props.active_window
        if not win:
            win = GemGraphWindow(application=self)

        # Display home mode by default
        win.stack_switch_mode("home")
        win.present()

    def do_open(self, widget, _):
        """Called when the application is activated with a file to open.

        We raise the application's main window, creating it if
        necessary.

        Also a callback for the app.openfile action
        """
        print("app.do_open called")
        win = self.props.active_window
        if not win:
            win = GemGraphWindow(application=self)

        # Open file
        pass

        # Activate file actions
        self.close_action.set_enabled(True)
        self.save_action.set_enabled(True)

        # Activate mode actions
        self.runmode_action.set_enabled(True)
        self.editmode_action.set_enabled(True)
        self.presentmode_action.set_enabled(True)

        # Display edit mode
        win.stack_switch_mode("edit")
        win.present()

    def on_close_action(self, widget, _):
        """Callback for the app.closefile action."""
        print('app.closefile action activated')
        win = self.props.active_window

        # Disable file actions
        self.close_action.set_enabled(False)
        self.save_action.set_enabled(False)

        # Disable mode actions
        self.runmode_action.set_enabled(False)
        self.editmode_action.set_enabled(False)
        self.presentmode_action.set_enabled(False)

        # Get home
        win.stack_switch_mode("home")

    def on_save_action(self, widget, _):
        """Callback for the app.savefile action."""
        print('app.savefile action activated')
        win = self.props.active_window

    def on_about_action(self, widget, _):
        """Callback for the app.about action."""
        about = AboutDialog(self.props.active_window)
        about.present()

    def on_preferences_action(self, widget, _):
        """Callback for the app.preferences action."""
        print('app.preferences action activated')
        win = self.props.active_window
        win.send_toast("Not implemented at this time (sorry!)")

    def on_editmode_action(self, widget, _):
        """Callback for the app.editmode action."""
        print('app.editmode action activated')
        win = self.props.active_window
        win.stack_switch_mode("edit")

    def on_runmode_action(self, widget, _):
        """Callback for the app.runmode action."""
        print('app.runmode action activated')
        win = self.props.active_window
        win.stack_switch_mode("run")

    def on_presentmode_action(self, widget, _):
        """Callback for the app.presentmode action."""
        print('app.presentmode action activated')
        win = self.props.active_window
        win.stack_switch_mode("presentation")

    def on_togglesidebar_action(self, widget, _):
        """Callback for the app.togglesidebar action."""
        print('app.togglesidebar action activated')
        win = self.props.active_window
        win.toggle_sidebar()

    def create_action(self, name, callback, is_enabled, shortcuts=None):
        """Add an application action.

        Args:
            name: the name of the action
            callback: the function to be called when the action is
              activated
            shortcuts: an optional list of accelerators
        """
        action = Gio.SimpleAction.new(name, None)
        action.connect("activate", callback)
        action.set_enabled(is_enabled)
        self.add_action(action)
        if shortcuts:
            self.set_accels_for_action(f"app.{name}", shortcuts)
        return action


def main(version):
    """The application's entry point."""
    app = GemGraphApplication()
    return app.run(sys.argv)