class LoginViewController extends TimeCardsViewController {
	viewWillAppear() {
		this.accountKeyField.value = localStorage.getItem("last_account_key");
		this.usernameField.value = localStorage.getItem("last_username");
		this.passwordField.value = "";

		//Show or hide the "Log in with a different user" button depending on whether there is a session or not.
		if (localStorage.getItem("session")) {
			this.differentUserButtonContainer.style.display = "";
			this.accountKeyField.disabled = true;
			this.usernameField.disabled = true;
		}
		else {
			this.differentUserButtonContainer.style.display = "none";
			this.accountKeyField.disabled = false;
			this.usernameField.disabled = false;
		}

		Navigation.displayForLogin();

		//Hide the loading view.
		//This is done because there have been cases where the loading view blocked a pending request login view.
		var loadingViewController = UIKit.getViewControllerById("loading-view-controller");
		if (loadingViewController) {
			loadingViewController.dismissModally();
		}
	}

	viewWillDisappear() {
		Navigation.endDisplayForLogin();
	}

	onLoginButtonPressed(event) {
		this.startLogin();
	}

	onDifferentUserButtonPressed(event) {
		Authentication.logOut();
	}

	onKeyUp(event) {
		if (event.keyCode == 13) {
			this.onLoginButtonPressed(event);
		}
	}

	startLogin() {
		this.loginErrorBox.style.display = "none";

		//Save the entered account key in the local storage.
		localStorage.setItem("last_account_key", this.accountKeyField.value);
		localStorage.setItem("last_username", this.usernameField.value);

		var request = new Request(TimeCards.REQUEST_URI + "Login", Request.POST, this.onLoginSuccess.bind(this), this.onLoginError.bind(this));
		request.send({
			//Use the stored values if the fields are disabled.
			account_key: this.accountKeyField.disabled ? localStorage.getItem("last_account_key") : this.accountKeyField.value,
			username: this.usernameField.disabled ? localStorage.getItem("last_username") : this.usernameField.value,
			password: this.passwordField.value
		}, true);
	}

	onLoginSuccess(response) {
		//Clear the password field for security reasons.
		this.passwordField.value = "";

		if (response === true) {
			UIKit.onHashChanged();
		}
	}

	onLoginError(request, status, error) {
		this.loginErrorBox.style.display = "";
	}
}

UIKit.registerViewControllerType(LoginViewController);