class ReportManager extends Listenable {
	constructor() {
		super();

		//Register the reports statically for the time being.
		this.registerReport("project", new ProjectReport());
	}

	/**
	 * Registers a new report with the given key. The key must be unique.
	 */
	registerReport(key, report) {
		if (!this.reports) {
			this.reports = { };
		}

		if (key in this.reports) {
			console.error("There is already a report with this key (\"" + key + "\").");
			return;
		}

		this.reports[key] = report;
	}

	/**
	 * Loads the report with the given key. Filter parameters and options may be passed as the optional second parameter.
	 * A reportloaded event is fired after the report has finished loading.
	 * A reporterror event is fired when an error occurs during the loading of the report.
	 */
	loadReport(key, options = null) {
		if (!(key in this.reports)) {
			console.error("Trying to load the report \"" + key + "\", but no report was registered with this key.");
			return;
		}

		this.loadingReport = this.reports[key];

		this.loadReportRequest = new Request(OnTime.REQUEST_URI + this.loadingReport.requestPath, Request.GET, this.onReportLoaded.bind(this), this.onReportLoadingError.bind(this));
		this.loadReportRequest.send(options);
	}

	/**
	 * Called when an error occurs while loading the report.
	 */
	onReportLoadingError(request, status, error) {
		var errorEvent = new Event("reporterror");
		errorEvent.report = this.loadingReport;
		this.dispatchEvent(errorEvent);

		this.loadingReport = null;
	}

	/**
	 * Called after a report has been successfully loaded.
	 */
	onReportLoaded(data) {
		var loadedEvent = new Event("reportloaded");
		this.loadingReport.data = data;
		loadedEvent.report = this.loadingReport;
		this.dispatchEvent(loadedEvent);

		this.loadingReport = null;
	}
}