feat: implement project export to Excel with API endpoint and UI button

src/app/api/projects/export/route.js

@@ -0,0 +1,96 @@
+// Force this API route to use Node.js runtime for database access and file operations
+export const runtime = "nodejs";
+
+import * as XLSX from 'xlsx';
+import { getAllProjects } from "@/lib/queries/projects";
+import initializeDatabase from "@/lib/init-db";
+import { NextResponse } from "next/server";
+import { withReadAuth } from "@/lib/middleware/auth";
+import {
+	logApiActionSafe,
+	AUDIT_ACTIONS,
+	RESOURCE_TYPES,
+} from "@/lib/auditLogSafe.js";
+
+// Make sure the DB is initialized before queries run
+initializeDatabase();
+
+async function exportProjectsHandler(req) {
+	try {
+		// Get all projects
+		const projects = getAllProjects();
+
+		// Group projects by status
+		const groupedProjects = projects.reduce((acc, project) => {
+			const status = project.project_status || 'unknown';
+			if (!acc[status]) {
+				acc[status] = [];
+			}
+			acc[status].push({
+				'Nazwa projektu': project.project_name,
+				'Adres': project.address || '',
+				'Działka': project.plot || '',
+				'WP': project.wp || '',
+				'Data zakończenia': project.finish_date || ''
+			});
+			return acc;
+		}, {});
+
+		// Polish status translations for sheet names
+		const statusTranslations = {
+			'registered': 'Zarejestrowany',
+			'in_progress_design': 'W realizacji (projektowanie)',
+			'in_progress_construction': 'W realizacji (budowa)',
+			'fulfilled': 'Zakończony',
+			'cancelled': 'Wycofany',
+			'unknown': 'Nieznany'
+		};
+
+		// Create workbook
+		const workbook = XLSX.utils.book_new();
+
+		// Create a sheet for each status
+		Object.keys(groupedProjects).forEach(status => {
+			const sheetName = statusTranslations[status] || status;
+			const worksheet = XLSX.utils.json_to_sheet(groupedProjects[status]);
+			XLSX.utils.book_append_sheet(workbook, worksheet, sheetName);
+		});
+
+		// Generate buffer
+		const buffer = XLSX.write(workbook, { type: 'buffer', bookType: 'xlsx' });
+
+		// Generate filename with current date
+		const filename = `projects_export_${new Date().toISOString().split('T')[0]}.xlsx`;
+
+		// Log the export action
+		await logApiActionSafe(
+			req,
+			AUDIT_ACTIONS.DATA_EXPORT,
+			RESOURCE_TYPES.PROJECT,
+			null,
+			req.auth,
+			{
+				exportType: 'excel',
+				totalProjects: projects.length,
+				statuses: Object.keys(groupedProjects)
+			}
+		);
+
+		// Return the Excel file
+		return new NextResponse(buffer, {
+			headers: {
+				'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+				'Content-Disposition': `attachment; filename="${filename}"`,
+			},
+		});
+
+	} catch (error) {
+		console.error('Error exporting projects to Excel:', error);
+		return NextResponse.json(
+			{ error: 'Failed to export projects' },
+			{ status: 500 }
+		);
+	}
+}
+
+export const GET = withReadAuth(exportProjectsHandler);

src/app/projects/page.js

@@ -123,6 +123,28 @@ export default function ProjectListPage() {
 		setSearchTerm('');
 	};
 
+	const handleExportExcel = async () => {
+		try {
+			const response = await fetch('/api/projects/export');
+			if (response.ok) {
+				const blob = await response.blob();
+				const url = window.URL.createObjectURL(blob);
+				const a = document.createElement('a');
+				a.href = url;
+				a.download = `projects_export_${new Date().toISOString().split('T')[0]}.xlsx`;
+				document.body.appendChild(a);
+				a.click();
+				window.URL.revokeObjectURL(url);
+				document.body.removeChild(a);
+			} else {
+				alert('Failed to export projects. Please try again.');
+			}
+		} catch (error) {
+			console.error('Export error:', error);
+			alert('An error occurred during export. Please try again.');
+		}
+	};
+
 	const toggleFilters = () => {
 		setFiltersExpanded(!filtersExpanded);
 	};
@@ -203,6 +225,27 @@ export default function ProjectListPage() {
 							{t('projects.mine') || 'Moje'}
 						</Button>
 					)}
+					<Button 
+						variant="outline" 
+						size="lg" 
+						className="w-full sm:w-auto"
+						onClick={handleExportExcel}
+					>
+						<svg
+							className="w-5 h-5 mr-2"
+							fill="none"
+							stroke="currentColor"
+							viewBox="0 0 24 24"
+						>
+							<path
+								strokeLinecap="round"
+								strokeLinejoin="round"
+								strokeWidth={2}
+								d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"
+							/>
+						</svg>
+						{t('projects.exportExcel') || 'Export to Excel'}
+					</Button>
 					<Link href="/projects/new" className="w-full sm:w-auto">
 						<Button variant="primary" size="lg" className="w-full">
 							<svg