feat: enhance dashboard API to generate continuous sample data and calculate cumulative values for project timelines

src/app/api/dashboard/route.js

@@ -65,20 +65,36 @@ export async function GET(request) {
 		let chartData;
 		let summary;
 		if (completedProjects.length === 0) {
-			chartData = [
-				{ month: 'Jan 2024', value: 50000, cumulative: 50000 },
-				{ month: 'Feb 2024', value: 75000, cumulative: 125000 },
-				{ month: 'Mar 2024', value: 60000, cumulative: 185000 },
-				{ month: 'Apr 2024', value: 80000, cumulative: 265000 },
-				{ month: 'May 2024', value: 95000, cumulative: 360000 },
-				{ month: 'Jun 2024', value: 70000, cumulative: 430000 },
-				{ month: 'Jul 2024', value: 85000, cumulative: 515000 },
-				{ month: 'Aug 2024', value: 90000, cumulative: 605000 },
-				{ month: 'Sep 2024', value: 78000, cumulative: 683000 },
-				{ month: 'Oct 2024', value: 92000, cumulative: 775000 },
-				{ month: 'Nov 2024', value: 88000, cumulative: 863000 },
-				{ month: 'Dec 2024', value: 95000, cumulative: 958000 }
-			];
+			// Generate continuous sample data from Jan 2024 to current month
+			const currentDate = new Date();
+			const startDate = new Date(2024, 0, 1); // Jan 2024
+			chartData = [];
+			let cumulative = 0;
+
+			let tempDate = new Date(startDate);
+			while (tempDate <= currentDate) {
+				const monthName = tempDate.toLocaleDateString('en-US', { year: 'numeric', month: 'short' });
+				let monthlyValue = 0;
+
+				// Add some sample values for certain months
+				if (tempDate.getMonth() === 0 && tempDate.getFullYear() === 2024) monthlyValue = 50000; // Jan 2024
+				else if (tempDate.getMonth() === 1 && tempDate.getFullYear() === 2024) monthlyValue = 75000; // Feb 2024
+				else if (tempDate.getMonth() === 2 && tempDate.getFullYear() === 2024) monthlyValue = 60000; // Mar 2024
+				else if (tempDate.getMonth() === 7 && tempDate.getFullYear() === 2024) monthlyValue = 10841; // Aug 2024 (real data)
+				else if (tempDate.getMonth() === 8 && tempDate.getFullYear() === 2024) monthlyValue = 18942; // Sep 2024
+				else if (tempDate.getMonth() === 9 && tempDate.getFullYear() === 2024) monthlyValue = 13945; // Oct 2024
+				else if (tempDate.getMonth() === 10 && tempDate.getFullYear() === 2024) monthlyValue = 12542; // Nov 2024
+
+				cumulative += monthlyValue;
+				chartData.push({
+					month: monthName,
+					value: monthlyValue,
+					cumulative: cumulative
+				});
+
+				tempDate.setMonth(tempDate.getMonth() + 1);
+			}
+
 			summary = {
 				total: {
 					realisedValue: 958000,
@@ -123,24 +139,70 @@ export async function GET(request) {
 				monthlyData[monthKey].value += projectValue;
 			});
 
-			// Second pass: calculate cumulative values
+			// Generate continuous timeline from earliest completion to current date
+			let startDate = new Date();
+			let endDate = new Date();
+
+			if (completedProjects.length > 0) {
+				// Find earliest completion date
+				const earliestCompletion = completedProjects.reduce((earliest, project) => {
+					const projectDate = new Date(project.completion_date);
+					return projectDate < earliest ? projectDate : earliest;
+				}, new Date());
+
+				startDate = new Date(earliestCompletion.getFullYear(), earliestCompletion.getMonth(), 1);
+			} else {
+				// If no completed projects, start from 6 months ago
+				startDate = new Date();
+				startDate.setMonth(startDate.getMonth() - 6);
+				startDate = new Date(startDate.getFullYear(), startDate.getMonth(), 1);
+			}
+
+			// Generate all months from start to current
+			const allMonths = {};
+			let currentDate = new Date(startDate);
+
+			while (currentDate <= endDate) {
+				const monthKey = `${currentDate.getFullYear()}-${String(currentDate.getMonth() + 1).padStart(2, '0')}`;
+				const monthName = currentDate.toLocaleDateString('en-US', { year: 'numeric', month: 'short' });
+
+				allMonths[monthKey] = {
+					month: monthName,
+					value: monthlyData[monthKey]?.value || 0
+				};
+
+				currentDate.setMonth(currentDate.getMonth() + 1);
+			}
+
+			// Calculate cumulative values
 			let cumulativeValue = 0;
-			const sortedMonths = Object.keys(monthlyData).sort((a, b) => a.localeCompare(b));
+			const sortedMonths = Object.keys(allMonths).sort((a, b) => a.localeCompare(b));
 
 			sortedMonths.forEach(monthKey => {
-				cumulativeValue += monthlyData[monthKey].value;
-				monthlyData[monthKey].cumulative = cumulativeValue;
+				cumulativeValue += allMonths[monthKey].value;
+				allMonths[monthKey].cumulative = cumulativeValue;
 			});
 
 			// Convert to array
 			chartData = sortedMonths.map(monthKey => ({
-				month: monthlyData[monthKey].month,
-				value: Math.round(monthlyData[monthKey].value),
-				cumulative: Math.round(monthlyData[monthKey].cumulative)
+				month: allMonths[monthKey].month,
+				value: Math.round(allMonths[monthKey].value),
+				cumulative: Math.round(allMonths[monthKey].cumulative)
 			}));
 			summary = {
-				realisedValue: Math.round(realisedValue),
-				unrealisedValue: Math.round(unrealisedValue)
+				total: {
+					realisedValue: Math.round(realisedValue),
+					unrealisedValue: Math.round(unrealisedValue)
+				},
+				byType: Object.fromEntries(
+					Object.entries(typeSummary).map(([type, data]) => [
+						type,
+						{
+							realisedValue: Math.round(data.realisedValue),
+							unrealisedValue: Math.round(data.unrealisedValue)
+						}
+					])
+				)
 			};
 		}