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;
	cumulativeRealDurations[cumulativeRealDurations.length - 1] = Math.ceil(cumulativeRealDurations[cumulativeRealDurations.length - 1]);
	var maxPlan = cumulativePlannedDurations[cumulativePlannedDurations.length - 1]
	var maxReal = cumulativeRealDurations[cumulativeRealDurations.length - 1]
	var dates = return_first.data[0].data.date;
	// Determine the appropriate data points based on the Gantt chart zoom level
	var chartScaleRange = getChartScaleRange();
	var zoomLevel = gantt.ext.zoom.getCurrentLevel();

	// Adjust data points based on the zoom level
	var plannedDurations, realDurations;

	if (zoomLevel === 2) {
		// Adjust data to monthly points
		plannedDurations = adjustDataToZoom(dates, cumulativePlannedDurations, chartScaleRange, 2).data;
		realDurations = adjustDataToZoom(dates, cumulativeRealDurations, chartScaleRange, 2).data;
		dates = adjustDataToZoom(dates, cumulativeRealDurations, chartScaleRange, 2).dates;
	} else if (zoomLevel === 1) {
		// Adjust data to weekly points
		plannedDurations = adjustDataToZoom(dates, cumulativePlannedDurations, chartScaleRange, 1).data;
		realDurations = adjustDataToZoom(dates, cumulativeRealDurations, chartScaleRange, 1).data;
		dates = adjustDataToZoom(dates, cumulativeRealDurations, chartScaleRange, 1).dates;
	} else {
		// Default: Use daily data points
		plannedDurations = cumulativePlannedDurations;
		realDurations = cumulativeRealDurations;

	}
	if (Math.floor(maxReal) > 110 || Math.floor(maxPlan) > 110) {
		plannedDurations = plannedDurations.map((item) => {
			return item / maxPlan * 100;
		})
		realDurations = realDurations.map((item) => {
			if (maxPlan >= 200) {
				return item / maxPlan * 100;
			} else {
				return item / maxReal * 100;
			}
		})
	}

	return { planned: plannedDurations, real: realDurations, dates: dates };
}
function adjustDataToZoom(dates, data, chartScaleRange, zoomLevel) {
	// Implement logic to adjust data points based on the Gantt chart zoom level
	// For example, if zoomLevel is 'month', aggregate daily data to monthly data

	// Placeholder logic: This example assumes that the chartScaleRange is in days
	var newData = [];
	var newDates = [];
	var aggregateValue = 0;

	for (var i = 0; i < data.length; i++) {
		aggregateValue = data[i];

		if (zoomLevel === 2 && i % 30 === 0) {
			// Aggregate data for each month (assuming 30 days in a month)
			newData.push(aggregateValue);
			newDates.push(dates[i]);
			aggregateValue = 0;
		} else if (zoomLevel === 1 && (i + 1) % 7 === 1) {
			// Aggregate data for each week
			newData.push(aggregateValue);
			newDates.push(dates[i]);
			aggregateValue = 0;
		}
	}

	if (aggregateValue > 0) {
		newData.push(+(Math.round(aggregateValue+ "e+2") + "e-2"));
		newDates.push(dates[data.length - 1]);
	}

	return {
		data: newData,
		dates: newDates
	};
}

function calculateMonthDifference(startDate, endDate) {
    let startYear = startDate.getFullYear();
    let startMonth = startDate.getMonth();
    let endYear = endDate.getFullYear();
    let endMonth = endDate.getMonth();
    
    let totalMonths = (endYear - startYear) * 12 + (endMonth - startMonth);
    return totalMonths;
}

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

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

	if(dataRange.start_date){
		var yScaleLabelsWidth = 48;
		let monthDifference = calculateMonthDifference(minValueDate, maxValueDate);
		if(monthDifference >= 0 && monthDifference <= 3) {
			padding.left = gantt.posFromDate(minValueDate) +5;
			padding.right = scale.full_width - gantt.posFromDate(maxValueDate) - yScaleLabelsWidth;
		}
		if(monthDifference >= 4 && monthDifference <= 7) {
			padding.left = gantt.posFromDate(minValueDate) - 2;
			padding.right = scale.full_width - gantt.posFromDate(maxValueDate) - yScaleLabelsWidth;
		}
		if(monthDifference >= 8) {
			padding.left = gantt.posFromDate(minValueDate) - 2;
			padding.right = scale.full_width - gantt.posFromDate(maxValueDate) - yScaleLabelsWidth;
		}

		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 = [];

	values.planned = values.planned.map(value => +(Math.round(value + "e+2") + "e-2"));
	values.real = values.real.map(value => +(Math.round(value + "e+2") + "e-2"));
    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;
});