import tkinter as tk
import tkinter.font as tfont
from tkinter import ttk
from tkinter import scrolledtext as tst
from webpicdownloader.controller.HomeController import HomeController
from webpicdownloader.view.MainWindow import MainWindow


class HomeView(ttk.Frame):
    """
        View - HomeWindow

    This view allows you to start the scraping/downloading process,
    as well as to display the progress of the process.

    @author     Jérémi Nihart / EndMove
    @link       https://git.endmove.eu/EndMove/WebPicDownloader
    @version    1.0.1
    @since      2022-09-05
    """
    # Variables
    __controller: HomeController = None

    # Constructor
    def __init__(self, parent: MainWindow, controller: HomeController):
        """
            Constructor

        * :parent: -> The main windows container.
        * :controller: -> The view controller
        """
        super().__init__(parent)
        
        # Init view
        self.__init_content()

        # Save and setup controller
        self.__controller = controller
        controller.set_view(self)
    
    # START Internal functions
    def __init_content(self) -> None:
        """
            [internal function]
        => Initialize the view content.
        """
        self.columnconfigure(0, weight=1)
        self.columnconfigure(1, weight=3)

        # Website link
        self.web_label = ttk.Label(self, text="Website URL:")
        self.web_label.grid(row=0, column=0, sticky=tk.W, padx=5, pady=5)
        self.web_entry = ttk.Entry(self, width=50)  # show="-"
        self.web_entry.grid(row=0, column=1, sticky=tk.E, padx=5, pady=5, ipadx=2, ipady=2)

        # Download name
        self.name_label = ttk.Label(self, text="Download Name:")
        self.name_label.grid(row=1, column=0, sticky=tk.W, padx=5, pady=5)
        self.name_entry = ttk.Entry(self, width=50)
        self.name_entry.grid(row=1, column=1, sticky=tk.E, padx=5, pady=5, ipadx=2, ipady=2)

        # Logs area
        log_textarea_font = tfont.Font(size=10)
        self.log_textarea = tst.ScrolledText(self, font=log_textarea_font, wrap=tk.WORD, state=tk.DISABLED, width=40, height=8)#, font=("Times New Roman", 15))
        self.log_textarea.grid(row=3, column=0, columnspan=2, sticky=tk.EW, pady=10, padx=10)

        # Message state
        self.message_label = ttk.Label(self, text='message label')

        # Download button
        self.download_button = ttk.Button(self, text="Start downloading", command=self.__event_button_download)
        self.download_button.grid(row=5, column=1, sticky=tk.E, padx=5, pady=5, ipadx=5, ipady=2)

    def __event_button_download(self) -> None:
        """
            [internal function]
        => Function called when a download is requested.
        """
        self.__controller.on_download_requested(self.web_entry.get(), self.name_entry.get())
    # END Internal functions

    # START Controller methods
    def add_log(self, line: str) -> None:
        """
            [function for controller]
        => Add a log in the textarea where the logs are displayed.

        * :line: -> Log message to add.
        """
        self.log_textarea.configure(state=tk.NORMAL)
        self.log_textarea.insert(tk.END, f"~ {line}\n")
        self.log_textarea.see(tk.END)
        self.log_textarea.configure(state=tk.DISABLED)

    def clear_logs(self) -> None:
        """
            [function for controller]
        => Clean the textarea where the logs are displayed.
        """
        self.log_textarea.configure(state=tk.NORMAL)
        self.log_textarea.delete('1.0', tk.END)
        self.log_textarea.configure(state=tk.DISABLED)
    
    def show_error_message(self, message) -> None:
        """
            [function for controller]
        => Display an error message on the interface.

        * :message: -> Message to display.
        """
        self.message_label.configure(text=message, foreground='red')
        self.message_label.grid(row=4, column=0, columnspan=2, sticky=tk.NS, padx=2, pady=2)
        self.message_label.after(25000, self.hide_message)

    def show_success_message(self, message) -> None:
        """
            [function for controller]
        => Display a success message on the interface.

        * :message: -> Message to display.
        """
        self.message_label.configure(text=message, foreground='green')
        self.message_label.grid(row=4, column=0, columnspan=2, sticky=tk.NS, padx=2, pady=2)
        self.message_label.after(25000, self.hide_message)

    def hide_message(self) -> None:
        """
            [function for controller and this view]
        => Hide the message on the interface.
        """
        self.message_label.grid_forget()

    def set_interface_state(self, disable: bool) -> None:
        """
            [function for controller]
        => Allows to change the status of the interface with which the user
        interacts by activating/deactivating it.

        * :disabled: -> True: interface disabled, False: interface enabled.
        """
        state = tk.DISABLED if disable else tk.NORMAL
        self.web_entry['state'] = state
        self.name_entry['state'] = state
        self.download_button['state'] = state
    # END Controller methods