refactor: modularize application domains

src/modules/mileage/monitoring/date-range.ts

@@ -0,0 +1,45 @@
+export type RangePreset = 'today' | 'yesterday' | 'thisWeek' | 'thisMonth' | 'last7' | 'last15';
+
+function formatLocalDate(date: Date): string {
+  return `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}-${String(date.getDate()).padStart(2, '0')}`;
+}
+
+/**
+ * The monitoring day rolls over at 05:00 local time. Before then the dashboard
+ * continues to use the previous calendar day, matching the existing UI rule.
+ */
+export function defaultMileageDate(now = new Date()): string {
+  const date = new Date(now);
+  if (date.getHours() < 5) date.setDate(date.getDate() - 1);
+  return formatLocalDate(date);
+}
+
+export function normalizeRangeLabel(start: string, end: string): string {
+  if (!start && !end) return '最新数据';
+  if (start && end && start === end) return start;
+  return `${start || end} 至 ${end || start}`;
+}
+
+export function getRangePreset(
+  preset: RangePreset,
+  now = new Date(),
+): { start: string; end: string } {
+  const end = new Date(`${defaultMileageDate(now)}T00:00:00`);
+  const start = new Date(end);
+
+  if (preset === 'yesterday') {
+    start.setDate(start.getDate() - 1);
+    end.setDate(end.getDate() - 1);
+  } else if (preset === 'thisWeek') {
+    const day = start.getDay() || 7;
+    start.setDate(start.getDate() - day + 1);
+  } else if (preset === 'thisMonth') {
+    start.setDate(1);
+  } else if (preset === 'last7') {
+    start.setDate(start.getDate() - 6);
+  } else if (preset === 'last15') {
+    start.setDate(start.getDate() - 14);
+  }
+
+  return { start: formatLocalDate(start), end: formatLocalDate(end) };
+}