import tkinter as tk
from tkinter import messagebox
from controller.Frames import Frames
from controller.MainController import MainController


class MainWindow(tk.Tk):
    """
        View - MainWindow

    This view is the main view of the application, it manages the different frames/views
    of the application, captures the events to send them to the main controller.

    @author     Jérémi Nihart / EndMove
    @link       https://git.endmove.eu/EndMove/WebPicDownloader
    @version    1.0.1
    @since      2022-09-04
    """
    # Variables
    __controller: MainController = None
    __views: dict = None
    __frame_id: int = None

    # Constructor
    def __init__(self, controller: MainController) -> None:
        """
            Constructor

        * :controller: -> The main application cpntroller.
        """
        super().__init__()

        # Init view repository
        self.__views = {}

        # Save and setup main controller
        self.__controller = controller
        controller.set_view(self)

        # Init view components & more
        self.__init_window()
        self.__init_top_menu()
        self.__init_bind_protocol()

    # START Internal methods
    def __init_window(self) -> None:
        """
            [internal function]
        => Initialize window parameters
        """
        self.iconbitmap(f"{self.__controller.get_config('sys_directory')}\\assets\logo.ico")  # App logo
        window_width = 430  # App width
        window_height = 305  # App height
        x_cordinate = int((self.winfo_screenwidth()/2) - (window_width/2))
        y_cordinate = int((self.winfo_screenheight()/2) - (window_height/2))
        self.geometry(f"{window_width}x{window_height}+{x_cordinate}+{y_cordinate}")  # App size and middle centering
        self.resizable(False, False)  # Disable app resizing
    
    def __init_top_menu(self) -> None:
        """
            [internal function]
        => Initialize top menu of the window.
        """
        main_menu = tk.Menu(self)

        # Top menu File item
        col1_menu = tk.Menu(main_menu, tearoff=0)
        col1_menu.add_command(label="Open app folder", command=self.__controller.on_open_folder)
        col1_menu.add_separator()
        col1_menu.add_command(label="Quit", command=self.__controller.on_quite)
        main_menu.add_cascade(label="File", menu=col1_menu)

        # Top menu Help item
        col2_menu = tk.Menu(main_menu, tearoff=0)
        col2_menu.add_command(label="Check for update", command=self.__controller.on_check_for_update)
        col2_menu.add_command(label="About", command=self.__controller.on_about)
        main_menu.add_cascade(label="Help", menu=col2_menu)

        self.config(menu=main_menu)

    def __init_bind_protocol(self) -> None:
        """
            [internal function]
        => Initialize the function bindding on events of the main window.
        """
        self.protocol("WM_DELETE_WINDOW", self.__controller.on_quite)
    # END Internal methods

    # START App methods
    def add_view(self, frame, view) -> None:
        """
            [function for app]
        
        * :frame: -> the frame id of the view to add.
        """
        self.__views[frame] = view
    # END App methods

    # START Controller methods
    def set_window_title(self, title: str) -> None:
        """
            [function for controller]
        => Sets the title of the main window.

        * :title: -> Window title.
        """
        self.title(title)

    def show_frame(self, frame: Frames) -> None:
        """
            [function for app & controller]
        => Allows to display the selected frame provided that it
        has been previously added to the frame dictionary.
        
        * :frame: -> the frame if of the view to display.
        """
        if self.__views.get(frame):
            if self.__frame_id:
                self.__views.get(self.__frame_id).pack_forget()
            self.__views.get(frame).pack(fill=tk.BOTH, expand=False)
            self.__frame_id = frame
        else:
            raise ValueError("Unable to find the requested Frame")
    
    def close_window(self) -> None:
        """
            [function for controller]
        => Closes the main window and stops the program from the controller.
        """
        self.destroy()
    
    def show_question_dialog(self, title: str, message: str, icon: str='question') -> bool:
        """
            [function for controller]
        => Display a question dialog to the user, which he can answer with yes or no.

        * :title: -> Title of the dialogue.
        * :message: -> Message of the dialogue displayed to the user.
        * :icon: -> Icon of the dialogue displayed to the user.
        * RETURN -> True id the user selected yes, False else.
        """
        return True if (messagebox.askquestion(title, message, icon=icon) == "yes") else False

    def show_information_dialog(self, title: str, message: str, icon: str='info') -> None:
        """
            [function for controller]
        => Display an information dialog to the user.

        * :title: -> Title of the dialogue.
        * :message: -> Message of the dialogue displayed to the user.
        * :icon: -> Icon of the dialogue displayed to the user.
        """
        messagebox.showinfo(title, message, icon=icon)
    # END Controller methods