feat(platform): export history query results

vehicle-data-platform/apps/web/src/domain/csvExport.ts

@@ -0,0 +1,29 @@
+export type CsvColumn<T> = {
+  title: string;
+  value: (row: T) => unknown;
+};
+
+function csvCell(value: unknown) {
+  if (value == null) return '';
+  const text = typeof value === 'object' ? JSON.stringify(value) : String(value);
+  return `"${text.replace(/"/g, '""')}"`;
+}
+
+export function buildCsv<T>(columns: CsvColumn<T>[], rows: T[]) {
+  return [
+    columns.map((item) => csvCell(item.title)).join(','),
+    ...rows.map((row) => columns.map((column) => csvCell(column.value(row))).join(','))
+  ].join('\n');
+}
+
+export function downloadCsv(filename: string, csv: string) {
+  const blob = new Blob(['\uFEFF', csv], { type: 'text/csv;charset=utf-8' });
+  const url = URL.createObjectURL(blob);
+  const link = document.createElement('a');
+  link.href = url;
+  link.download = filename;
+  document.body.appendChild(link);
+  link.click();
+  link.remove();
+  URL.revokeObjectURL(url);
+}