from net.UnicastConnection import *
from model.Protocol import *
import traceback
import os.path


class AppController:
    def __init__(self, parser):
        self.parser = parser
        self.connection = UnicastConnection()
        self.window_controller = None

    def ssl_ca_path(self, ca_path):
        self.connection.set_ca_path(ca_path)

    def set_window_controller(self, window_controller):
        self.window_controller = window_controller

    def on_sign(self, host, port, login, passw, tls, register=False):
        print("[AppController::on_sign]")
        try:
            if not self.connection.is_connected:
                print("[AppController::on_sign] connecting ... calling UnicastConnection::connect")
                self.connect(host, port, tls)
            if not register:
                message = self.parser.build_SIGNIN(login, passw)
            else:
                message = self.parser.build_SIGNUP(login, passw)
            self.connection.send_message(message)
            line = self.connection.read_line()
            message_id = self.parser.parse(line, False)
            if message_id == Protocol.PARSE_SIGNOK:
                self.window_controller.switch_connected_mode()
                self.show_message("Connection done", False)
                self.on_filelist()
            elif message_id == Protocol.PARSE_SIGNERROR:
                self.show_message("Error during SIGN_IN / SIGN_UP", True)
                self.connection.close()
        except Exception as ex:
            print(ex)
            traceback.print_exc()

    def get_filename_size_from_item(self, item):
        tokens = item.split('!')
        if len(tokens) == 2:
            return (tokens[0], tokens[1])
        else:
            return None

    def on_filelist(self):
        print("[AppController::on_filelist]")
        try:
            if self.connection.is_connected:
                message = self.parser.build_FILELIST()
                self.connection.send_message(message)
                line = self.connection.read_line()
                message_id = self.parser.parse(line, False)
                if message_id == Protocol.PARSE_FILES:
                    tokens = self.parser.parse_FILES(line)
                    if len(tokens) == 1:
                        self.window_controller.clear_all_file_on_window()
                        allfiles = tokens[0].split()
                        for f in allfiles:
                            (filename, filesize) = self.get_filename_size_from_item(f)
                            self.window_controller.add_file_on_window([filename, filesize])
        except Exception as ex:
            print(ex)
            traceback.print_exc()

    def on_quit(self):
        if self.connection.is_connected:
            self.connection.send_message(self.parser.build_SIGNOUT())

    def on_fileupload(self, filepath):
        if os.path.isfile(filepath):
            size = os.path.getsize(filepath)
            print(f"[AppController::on_fileupload] file={filepath}; size={size}")
            message = self.parser.build_SAVEFILE(os.path.basename(filepath), size)
            self.connection.send_message(message)
            self.connection.send_file(filepath)
            line = self.connection.read_line()
            message_id = self.parser.parse(line, False)
            if message_id == Protocol.PARSE_SAVEFILEOK:
                self.show_message("File saved", False)
                self.on_filelist()
            elif message_id == Protocol.PARSE_SAVEFILEERROR:
                self.show_message("Error during saving file !", True)
        else:
            self.show_message(f"Error: file {filepath} not found !", True)

    def on_filedownload(self, filename, savepath):
        if os.path.isdir(savepath):
            print(f"[AppController::on_filedownload] file={filename}; path={savepath}")
            message = self.parser.build_GETFILE(filename)
            self.connection.send_message(message)
            line = self.connection.read_line()
            message_id = self.parser.parse(line, False)
            if message_id == Protocol.PARSE_GETFILEOK:
                tokens = self.parser.parse_GETFILEOK(line)
                if len(tokens) == 2:
                    self.connection.receive_file(tokens[0], savepath, int(tokens[1]))
                    self.show_message("File downloaded !", False)
                else:
                    self.show_message(f"Bad file information\n{tokens}")
            elif message_id == Protocol.PARSE_GETFILEERROR:
                self.show_message(f"Cannot download the file", True)
        else:
            self.show_message(f"Error: directory {savepath} not found !", True)

    def on_filedelete(self, filename):
        print(f"[AppController::on_filedelete] file={filename}")
        message = self.parser.build_REMOVEFILE(filename)
        self.connection.send_message(message)
        line = self.connection.read_line()
        message_id = self.parser.parse(line, False)
        if message_id == Protocol.PARSE_REMOVEFILEOK:
            self.show_message("File deleted successfully !", False)
            self.on_filelist()
        elif message_id == Protocol.PARSE_REMOVEFILEERROR:
            self.show_message("Error while erasing file.", True)

    def show_message(self, message, is_error):
        self.window_controller.show_message(message, is_error)

    def connect(self, host, port, tls):
        try:
            self.connection.connect(host, port, tls)
            if tls and UnicastConnection.STRICT_SSL_VALIDATION:
                self.show_message(self.connection.ssl_info, False)
            elif tls and not UnicastConnection.STRICT_SSL_VALIDATION:
                self.show_message("SSL/TLS enabled, but certificate NOT checked !", False)
            else:
                self.show_message("No SSL connection", False)

        except Exception as ex:
            self.show_message(f"Error during connection !\n{ex}", True)
            self.connection = UnicastConnection()