import toga
from toga.style.pack import COLUMN, ROW, CENTER, START, END
from toga.style import Pack
from justgetit.constants import *
from justgetit.login import Login
from justgetit.register import Register
from justgetit.configuration import Configuration
from justgetit.providekey import ProvideKey
from justgetit.lists import Lists


class JustEatIt(toga.App):
    login_screen = toga.Box()
    register_screen = toga.Box()
    providekey_screen = toga.Box()
    lists_screen = toga.Box()
    configuration = None
    last_screen_width = SCREENWIDTH


    def goto_next_page_by_name(self, destination):
        """
        ask app to activate a next page, id of the page is in the id of the widget
        
        :param widget: the widget that called this function
        """
        if destination == PAGE_REGISTER:
            self.set_page(self.register_screen)
        elif destination == PAGE_LOGIN:
            self.set_page(self.login_screen)
        elif destination == PAGE_LISTS:
            self.set_page(self.lists_screen)

    def startup(self):
        self.configuration = Configuration(self)

        self.login_screen = Login()
        self.register_screen = Register()
        self.providekey_screen = ProvideKey()
        self.lists_screen = Lists()

        self.main_window = toga.MainWindow(title=self.formal_name)

        # here comes the startup logic.
        # check if there is a valid APP-KEY
        # check if there is va alid user and user has been logged in recently
        if self.configuration.has_valid_app_key():
            if self.configuration.user_is_logged_in():
                self.set_page(self.lists_screen)
            else:
                self.set_page(self.login_screen)
        else:
            self.set_page(self.providekey_screen)
        self.main_window.show()

        # Initial layout clamp
        self.on_resize(self.main_window)
    
    def set_page(self, page):
        page.set_screen_width(self.last_screen_width)
        self.main_window.content = page

    def on_resize(self, widget, **kwargs):
        width = self.main_window.size.width

        if width < SCREENWIDTH:
            # Phone-like: fill available width
            elf.last_screen_width = width
        else:
            self.last_screen_width = SCREENWIDTH
        # set actie screen to the corre ct width
        self.main_window.content.set_screen_width(self.last_screen_width)

    def on_exit(self):
        self.configuration.save()
        return super().on_exit()

def main():
    return JustEatIt(icon='images/logo.png')