# -*- coding: utf-8 -*-
from ui.login import Ui_LoginDialog
from PyQt4.QtGui import QApplication, QDialog

class Model:
    users = [{"id": 1, "username": "Admin", "password": "1", "role": "admin"},
             {"id": 2, "username": "tester", "password": "test", "role": "user"}]

    def __init__(self, controller):
        self.controller = controller

    def login(self, username, password):
        for user in self.users:
            if user['username'] == username and user['password'] == password:
                return {"id": user['id'], "username": user['username'], "role": user['role']}

        return {"error": "Invalid username or password."}

class View(QDialog, Ui_LoginDialog):
    def __init__(self, controller):
        QDialog.__init__(self)
        self.setupUi(self)
        self.controller = controller
        self.errorLabel.setStyleSheet("color: red")
        self.errorLabel.hide()
        self.loginButton.clicked.connect(self.onLogin)

    def onLogin(self):
        self.errorLabel.hide()
        username = unicode(self.usernameEdit.text())
        password = unicode(self.passwordEdit.text())
        self.controller.login(username, password)

    def showError(self, text):
        self.errorLabel.show()
        self.errorLabel.setText(text)

class Controller:
    def __init__(self):
        self.model = Model(self)
        self.view = View(self)
        self.view.show()

    def login(self, username, password):
        username = username.strip()
        password = password.strip()

        if not username:
            self.view.showError(u"Введите имя пользователя.")
        elif not password:
            self.view.showError(u"Введите пароль.")
        else:
            result = self.model.login(username, password)

            if 'error' in result:
                self.view.showError(result['error'])
            else:
                print u"Вы авторизовались как {username}.".format(**result)
                self.view.close()

if __name__ == '__main__':
    a = QApplication([])
    c = Controller()
    a.exec_()