class ReservationViewController extends ViewController {
	viewDidAppear() {
		ReservationManager.loadReservations(this.onReservationsLoaded.bind(this));
	}

	onReservationsLoaded() {
		if (this.reservationButton) {
			this.reservationButton.disabled = false;
		}
	}

	onBackButtonPressed(event) {
		this.dismissModally();
	}

	onInputFieldChanged(event) {
		this.validateFields();
	}

	onReserveButtonPressed(event) {
		this.validateFields();

		if (!this.allValid) {
			alert("Bitte schau noch mal alle Eingabefelder durch. Es gibt Fehleingaben.");
			return;
		}

		//Get the dates.
		var fromDate = new Date(this.startDateField.value);
		var toDate = new Date(this.returnDateField.value);

		//Gather the data and send the reservation request.
		ReservationManager.performReservation({
			name: this.nameField.value,
			email: this.emailField.value,
			destination: this.destinationField.value,
			description: this.descriptionField.value,
			from_time: fromDate.getTime() + fromDate.getTimezoneOffset() * 60 * 1000,
			to_time: toDate.getTime() + toDate.getTimezoneOffset() * 60 * 1000,
			code: localStorage.getItem("code")
		}, this.onReservationSucceeded.bind(this), this.onReservationFailed.bind(this));
	}

	onReservationSucceeded(data) {
		this.presentModalViewController(UIKit.getViewControllerById("success-view-controller"));
		this.clearFields();
	}

	onReservationFailed(request, status, error) {
		alert("Die Reservation konnte nicht erfasst werden. Melde diese Fehlermeldung, damit wir das Problem lösen können:\r\n\r\n" + error);
	}

	clearFields() {
		var fieldsToClear = [
			"nameField",
			"emailField",
			"destinationField",
			"descriptionField",
			"startDateField",
			"returnDateField"
		];

		for (var i = 0; i < fieldsToClear.length; i++) {
			this[fieldsToClear[i]].value = null;
		}
	}

	validateFields() {
		this.allValid = true;

		//Make sure all required fields are set.
		var requiredFieldNames = [
			"nameField",
			"emailField",
			"destinationField",
			"startDateField",
			"returnDateField"
		];
		for (var i = 0; i < requiredFieldNames.length; i++) {
			var field = this[requiredFieldNames[i]];
			if (!field.value) {
				this.allValid = false;
				this[requiredFieldNames[i] + "ValidationResponseLabel"].innerText = "Dieses Feld musst du ausfüllen.";
				this[requiredFieldNames[i] + "ValidationResponseLabel"].style.display = "";
			}
			else {
				this[requiredFieldNames[i] + "ValidationResponseLabel"].style.display = "none";
			}
		}

		//Make sure the return date is after the start date.
		if (this.startDateField.value && this.returnDateField.value) {
			var startDate = new Date(this.startDateField.value);
			var returnDate = new Date(this.returnDateField.value);

			var startTime = startDate.getTime();
			var returnTime = returnDate.getTime();

			if (returnTime <= startTime) {
				this.allValid = false;
				this.returnDateFieldValidationResponseLabel.innerText = "Frou Monk kann nicht mit Überlichtgeschwindigkeit fahren. Deswegen kannst du damit auch nicht in die Vergangenheit reisen. Wähle stattdessen ein Rückgabedatum, das nach dem Startdatum kommt.";
				this.returnDateFieldValidationResponseLabel.style.display = "";
			}
			else {
				this.returnDateFieldValidationResponseLabel.style.display = "none";

				//Also check if there are any other reservations in the selected date range.
				var checkingDate = new Date(startDate.getTime() - 86400000);
				while (checkingDate.getFullYear() != returnDate.getFullYear() || checkingDate.getMonth() != returnDate.getMonth() || checkingDate.getDate() != returnDate.getDate()) {
					checkingDate.setDate(checkingDate.getDate() + 1);

					if (ReservationManager.getReservationStatusForDate(checkingDate) != 0) {
						this.allValid = false;
						this.returnDateFieldValidationResponseLabel.innerText = "Zu dieser Zeit ist Frou Monk schon reserviert. Schau im Kalender nach, wann sie frei ist.";
						this.returnDateFieldValidationResponseLabel.style.display = "";
						break;
					}
				}

				if (this.allValid) {
					this.returnDateFieldValidationResponseLabel.style.display = "none";
				}
			}
		}
	}
}

UIKit.registerViewControllerType(ReservationViewController);