# main.py
#
# Copyright 2020 Morgan McMillian
#
# 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
import os
import pnutpy
import logging

gi.require_version('Gdk', '3.0')
gi.require_version('Gtk', '3.0')
from gi.repository import GObject, Gdk, Gtk, Gio, GLib

gi.require_version('Handy', '1')
from gi.repository import Handy
Handy.init()

from .widgets import LoginPage, Timeline, PostItem, ComposeWindow

class Application(Gtk.Application):

    def __init__(self):
        super().__init__(application_id='dev.thrrgilag.squeak',
                         flags=Gio.ApplicationFlags.FLAGS_NONE)

    def do_startup(self):
        Gtk.Application.do_startup(self)

        self.authorized = False
        self.keyfile = GLib.KeyFile()
        self.config_dir = GLib.get_user_config_dir()
        self.config_file = os.path.join(self.config_dir, "squeak")

        try:
            self.keyfile.load_from_file(self.config_file,
                    GLib.KeyFileFlags.KEEP_COMMENTS)

            access_token = self.keyfile.get_string("GENERAL", "ACCESS_TOKEN")
            if len(access_token) > 0:
                pnutpy.api.add_authorization_token(access_token)
                self.authorized = True

        except GLib.Error:
            pass

        action = Gio.SimpleAction.new('newpost', None)
        action.connect('activate', self.on_new_post)
        self.add_action(action)
        self.set_accels_for_action('app.newpost',["<Ctrl>n"])

        action = Gio.SimpleAction.new('top', None)
        action.connect('activate', self.on_top)
        self.add_action(action)

        action = Gio.SimpleAction.new('refresh', None)
        action.connect('activate', self.on_refresh)
        self.add_action(action)
        self.set_accels_for_action('app.refresh',["<Ctrl>r"])

        action = Gio.SimpleAction.new('preferences', None)
        action.connect('activate', self.on_preferences)
        self.add_action(action)
        # TODO: this shortcut might need adjustment
        self.set_accels_for_action('app.preferences',["<Ctrl>,"])

        action = Gio.SimpleAction.new('about', None)
        action.connect('activate', self.on_about)
        self.add_action(action)

        action = Gio.SimpleAction.new('quit', None)
        action.connect('activate', self.on_quit)
        self.add_action(action)
        self.set_accels_for_action('app.quit',["<Ctrl>q"])

        self.builder = Gtk.Builder.new_from_resource("/dev/thrrgilag/squeak/menu.ui")

    def do_activate(self):
        self.win = self.props.active_window
        if not self.win:
            self.win = Gtk.ApplicationWindow(application=self)
        self.win.set_default_size(320, 480)

        title_bar = Handy.TitleBar()
        self.win.set_titlebar(title_bar)

        self.header = Handy.HeaderBar(show_close_button=True)
        title_bar.add(self.header)

        self.stack = Gtk.Stack()

        stack_switcher_bar = Handy.ViewSwitcherBar()
        stack_switcher_bar.set_stack(self.stack)

        switcher_title = Handy.ViewSwitcherTitle()
        switcher_title.set_stack(self.stack)
        self.header.set_custom_title(switcher_title)

        self.header.bind_property("title", switcher_title, "title",
                GObject.BindingFlags.SYNC_CREATE)
        self.header.bind_property("subtitle", switcher_title, "subtitle",
                GObject.BindingFlags.SYNC_CREATE)
        switcher_title.bind_property("title-visible", stack_switcher_bar,
                "reveal", GObject.BindingFlags.SYNC_CREATE)

        if self.authorized:
            self.show_main_page()
        else:
            self.show_login_page()

        vbox = Gtk.Box(orientation='vertical')
        vbox.pack_start(self.stack, True, True, 0)
        vbox.pack_end(stack_switcher_bar, False, False, 0)

        self.win.add(vbox)
        self.win.show_all()

    def handle_login(self, args, code):
        # TODO: should do some actual error handling here
        self.keyfile.set_string("GENERAL", "ACCESS_TOKEN", code)
        self.keyfile.save_to_file(self.config_file)
        pnutpy.api.add_authorization_token(code)
        self.authorized = True
        self.show_main_page()

    def show_login_page(self):
        login_page = LoginPage()
        login_page.connect("login", self.handle_login)
        self.stack.add_titled(login_page, "login", "Login")
        self.header.show_all()

    def show_main_page(self):
        login_page = self.stack.get_child_by_name("login")
        if login_page is not None:
            self.stack.remove(login_page)

        # TODO: find better icons
        unified = Timeline('unified')
        unified.connect('reply', self.on_reply_post)
        self.stack.add_titled(unified, "unified", "Timeline")
        self.stack.child_set_property(unified, "icon-name", "user-home-symbolic")
        mentions = Timeline('mentions')
        mentions.connect('reply', self.on_reply_post)
        self.stack.add_titled(mentions, "mentions", "Mentions")
        self.stack.child_set_property(mentions, "icon-name", "goa-panel-symbolic")
        bookmarks = Timeline('bookmarks')
        bookmarks.connect('reply', self.on_reply_post)
        self.stack.add_titled(bookmarks, "bookmarks", "Bookmarks")
        self.stack.child_set_property(bookmarks, "icon-name", "user-bookmarks-symbolic")
        global_tl = Timeline('global')
        global_tl.connect('reply', self.on_reply_post)
        self.stack.add_titled(global_tl, "global", "Global")
        self.stack.child_set_property(global_tl, "icon-name", "network-workgroup-symbolic")

        new_post_button = Gtk.Button.new_from_icon_name('list-add-symbolic', 1)
        new_post_button.connect('clicked', self.on_new_post)
        self.header.pack_start(new_post_button)

        menu = self.builder.get_object("app-menu")
        menu_button = Gtk.Button.new_from_icon_name('open-menu-symbolic', 1)
        menu_button.connect('clicked', self.on_main_popover)
        self.main_popover = Gtk.Popover.new_from_model(menu_button, menu)
        self.header.pack_end(menu_button)

        update_button = Gtk.Button.new_from_icon_name('view-refresh-symbolic', 1)
        update_button.connect('clicked', self.on_refresh)
        self.header.pack_end(update_button)

        self.header.show_all()

        self.stack.show_all()

    def on_new_post(self, widget, param=None):
        compose = ComposeWindow()
        compose.set_transient_for(self.win)

    def on_reply_post(self, widget, post_id, text):
        compose = ComposeWindow()
        compose.set_post(text)
        compose.set_reply_to(post_id)
        compose.set_transient_for(self.win)

    def on_main_popover(self, button):
        self.main_popover.popup()

    def on_refresh(self, action, param=None):
        timeline = self.stack.get_visible_child()
        timeline.emit('refresh')

    def on_top(self, action, param):
        timeline = self.stack.get_visible_child()
        timeline.emit('top')

    def on_preferences(self, action, param):
        pass

    def on_about(self, action, param):
        pass

    def on_quit(self, action, param):
        self.quit()

def main(version):
    logging.basicConfig(level=logging.DEBUG)
    app = Application()
    return app.run(sys.argv)