var overlayControl = gantt.ext.overlay;
var today = new Date();
var return_first;
var parts = [];

var sCurvePayload = {
	period: 'week',
	project_id: proyekId,
  gantt_id: ganttId
};

function callback(response) {
	return_first = response;
}

function messageListener(event) {
	if (event.data && event.data.action === 'sendUrl') {
		const parentUrl = event.data.url;
        const isHierarchy = event.data.isHierarchy;

		// Split the remaining path by "/"
		parts = parentUrl.split("/");
		if (parts[7] && parts[7] == "1" && isHierarchy) {
			$.ajax({
				headers: {
					"Content-Type": "application/json",
					"Authorization": `Bearer ${token}`
				},
				url: `${base_url}project/calculate-s-curve`,
				type: "POST",
				data: JSON.stringify(sCurvePayload),
				success: function (data) {
					callback(data)
					window.removeEventListener('message', messageListener);
				}
			});
			$.ajax({
				headers: {
					"Content-Type": "application/json",
					"Authorization": `Bearer ${token}`
				},
				url: `${base_url}project/s-curve-command`,
				type: "POST",
				data: JSON.stringify(sCurvePayload),
			});
		} else {
			$.ajax({
				headers: {
					"Content-Type": "application/json",
					"Authorization": `Bearer ${token}`
				},
				url: `${base_url}project/get-s-curve`,
				type: "POST",
				data: JSON.stringify(sCurvePayload),
				success: function (data) {
					callback(data)
					window.removeEventListener('message', messageListener);
				}
			});
		}
	}
}

function getSCurveData() {
	window.parent.postMessage({ action: 'getUrl' }, '*');
	window.addEventListener('message', messageListener);
};

function toggleOverlay() {
	if(overlayControl.isOverlayVisible(lineOverlay)){
		gantt.config.readonly = false;
		overlayControl.hideOverlay(lineOverlay);
		gantt.$root.classList.remove("overlay_visible");
	}else{
		gantt.config.readonly = true;
		overlayControl.showOverlay(lineOverlay);
		gantt.$root.classList.add("overlay_visible");
	}
}

function getChartScaleRange(){
	var tasksRange = gantt.getSubtaskDates();
	var cells = [];
	var scale = gantt.getScale();
	if(!tasksRange.start_date){
		return scale.trace_x;
	}

	scale.trace_x.forEach(function(date){
		// if(date >= tasksRange.start_date && date <= tasksRange.end_date){
		// 	cells.push(date);
		// }
    cells.push(date);
	});
	return cells;
}

function getProgressLine(){
	// As long as the progress data length is same with chart scale range (period) then it's fine.
	getSCurveData();
	var cumulativePlannedDurations = return_first.data[0].data.percentagePlan;
	var cumulativeRealDurations = return_first.data[0].data.percentageReal;
  var maxPlan = cumulativePlannedDurations[cumulativePlannedDurations.length - 1]
  var maxReal = cumulativeRealDurations[cumulativeRealDurations.length - 1]
  var dates = return_first.data[0].data.date;
  if (maxReal > 100 || maxPlan > 100) {
    var plannedDurations = cumulativePlannedDurations.map((item) => {
      return item/maxPlan*100;
    })
    var realDurations = cumulativeRealDurations.map((item) => {
      return item/maxPlan*100;
    })
    return {planned: plannedDurations, real: realDurations, dates: dates};
  }

	return {planned: cumulativePlannedDurations, real: cumulativeRealDurations, dates: dates};
}

function getScalePaddings(values){
	var scale = gantt.getScale();
	var dataRange = gantt.getSubtaskDates();
	// let minDate = new Date();
	// let maxDate = new Date();
	let minValueDate = new Date(values.dates[0]);
	let maxValueDate = new Date(values.dates[values.dates.length -1]);

	// gantt.eachTask(function(task){
    //     let plannedEarlier = task.planned_start < task.start_date;
    //     let plannedLater = task.planned_end > task.end_date;

    //     if (plannedEarlier) {
    //         minDate = new Date(Math.min(minDate.getTime(), task.planned_start.getTime()));
    //     } else {
    //         minDate = new Date(Math.min(minDate.getTime(), task.start_date.getTime()));
    //     }

    //     if (plannedLater) {
    //         maxDate = new Date(Math.max(maxDate.getTime(), task.planned_end.getTime()));
    //     } else {
    //         maxDate = new Date(Math.max(maxDate.getTime(), task.end_date.getTime()));
    //     }
	// })

	var padding = {
		left:0,
		right:0
	};

	if(dataRange.start_date){
		var yScaleLabelsWidth = 48;
		// fine tune values in order to align chart with the scale range
		padding.left = gantt.posFromDate(minValueDate);
		padding.right = scale.full_width - gantt.posFromDate(maxValueDate);
		padding.top = gantt.config.row_height - 12;
		padding.bottom = gantt.config.row_height - 12;
	}
	return padding;
}

var myChart;
var lineOverlay = overlayControl.addOverlay(function(container) {
	var values = getProgressLine();
  var scaleLabels = [];

//   if(parts[2] && parts[2] == '1'){
//     values.dates.forEach(function(date){
//       var dateScale = new Date(date);
//       scaleLabels.push(dateToStr(dateScale));
//     })
//   } else {
//     var chartScale = getChartScaleRange();

//     chartScale.forEach(function(date){
//       scaleLabels.push(dateToStr(date));
//     });
//   }
    values.dates.forEach(function(date){
      var dateScale = new Date(date);
      scaleLabels.push(dateToStr(dateScale));
    })
	var canvas = document.createElement("canvas");
	container.appendChild(canvas);
	canvas.style.height = container.offsetHeight + "px";
	canvas.style.width = container.offsetWidth + "px";

	var ctx = canvas.getContext("2d");
	if(myChart){
		myChart.destroy();
	}
	myChart = new Chart(ctx, {
		type: "line",
		data: {
			datasets: [
				{
					label: "Planned progress",
					backgroundColor: "#0000cc",
					borderColor: "#0000cc",
					data: values.planned,
					fill: false,
					cubicInterpolationMode: 'monotone'
				},
				{
					label: "Real progress",
					backgroundColor: "#006600",
					borderColor: "#006600",
					data: values.real,
					fill: false,
					cubicInterpolationMode: 'monotone'
				}
			]
		},
		options: {
			responsive: true,
			maintainAspectRatio: false,
			layout: {
				padding: getScalePaddings(values)
			},
			onResize: function(chart, newSize) {
				var dataRange = gantt.getSubtaskDates();
				if(dataRange.start_date){
					// align chart with the scale range
					chart.options.layout.padding = getScalePaddings(values);
				}
			},
			legend: {
				display: false
			},
			tooltips: {
				mode: "index",
				intersect: false,
				callbacks: {
					label: function(tooltipItem, data) {
						var dataset = data.datasets[tooltipItem.datasetIndex];
						return dataset.label + ": " + dataset.data[tooltipItem.index] + "%";
					}
				}
			},
			hover: {
				mode: "nearest",
				intersect: true
			},
			scales: {
				xAxes: [{
					labels: scaleLabels,
					gridLines:{
						display: false
					},
					ticks: {
						display: false
					}
				},
					{
						position:"top",
						labels: scaleLabels,
						gridLines:{
							display: false
						},
						ticks: {
							display: false
						}
					}
				],
				yAxes: [{
					display: true,
					gridLines: {
						display:false
					},
					ticks: {
						display: true,
						min: 0,
						stepSize: 10,
					}
				},
				]
			}
		}
	});
	return canvas;
});