class ReportView extends View {
	constructor(element = null) {
		super(element);

		this.selectedReport = "project";
	}

	viewDidLoad() {
		var currentDate = new Date();
		currentDate.setHours(0);
		currentDate.setMinutes(0);
		currentDate.setSeconds(0);
		currentDate.setMonth(currentDate.getMonth() - 1);
		currentDate.setDate(1);

		var lastMonthStartDate = new Date(currentDate.getTime());

		currentDate.setMonth(currentDate.getMonth() + 1);
		currentDate.setSeconds(-1);

		var lastMonthEndDate = new Date(currentDate.getTime());

		this.fromDateField.value = lastMonthStartDate.getFullYear() + "-" + this.addLeadingZero(lastMonthStartDate.getMonth() + 1) + "-" + this.addLeadingZero(lastMonthStartDate.getDate());
		this.toDateField.value = lastMonthEndDate.getFullYear() + "-" + this.addLeadingZero(lastMonthEndDate.getMonth() + 1) + "-" + this.addLeadingZero(lastMonthEndDate.getDate());

		OnTime.reportManager.addEventListener("reportloaded", this.onReportLoaded.bind(this));
		OnTime.reportManager.addEventListener("reporterror", this.onReportLoadingError.bind(this));
	}

	addLeadingZero(value) {
		value = "" + value;
		if (value.length < 2) {
			value = "0" + value;
		}

		return value;
	}

	onLoadButtonPressed() {
		this.loadButton.disabled = true;
		this.downloadButton.disabled = true;

		var options = {
			from_date: this.fromDateField.value,
			to_date: this.toDateField.value,
			project_key: this.projectsViewController.selectedProject.project_key
		};

		OnTime.reportManager.loadReport(this.selectedReport, options);
	}

	onReportLoaded(event) {
		this.loadButton.disabled = false;
		this.downloadButton.disabled = false;

		this.reportTableController.populateWithReport(event.report);
	}

	onReportLoadingError(event) {
		alert("An error occurred while loading the requested report.");

		this.loadButton.disabled = false;

		//Only reenable the download button if there is data inside the table from a previous report request.
		if (this.reportTableController.data) {
			this.downloadButton.disabled = false;
		}
	}

	onDownloadButtonPressed(event) {
		var csvString = this.reportTableController.getCSVData();

		var blob = new Blob([csvString], { type: "text/csv;charset=utf-8" });

		var link = document.createElement("a");
		var url = URL.createObjectURL(blob);
		link.href = url;
		link.download = "Work Time Report (" + this.fromDateField.value + " – " + this.toDateField.value + ").csv";

		document.body.appendChild(link);

		link.click();

		setTimeout(function() {
			document.body.removeChild(link);
			URL.revokeObjectURL(url);
		}, 0);
	}
}

UIKit.registerViewType(ReportView);