user report gtound work

apps/admin/src/lib/utils/iso-week.ts

@@ -0,0 +1,153 @@
+/**
+ * ISO Week Calculation Utilities
+ *
+ * Helper functions for ISO 8601 week calculations
+ * Week starts on Monday and ends on Sunday
+ */
+
+/**
+ * Get the Monday of the ISO week for a given date
+ */
+export function getWeekStart(date: Date): Date {
+  const d = new Date(date);
+  const day = d.getDay();
+  const diff = d.getDate() - day + (day === 0 ? -6 : 1);
+  d.setDate(diff);
+  d.setHours(0, 0, 0, 0);
+  return d;
+}
+
+/**
+ * Get the Sunday of the ISO week for a given date
+ */
+export function getWeekEnd(date: Date): Date {
+  const monday = getWeekStart(date);
+  const sunday = new Date(monday);
+  sunday.setDate(sunday.getDate() + 6);
+  sunday.setHours(23, 59, 59, 999);
+  return sunday;
+}
+
+/**
+ * Get ISO week number (1-53)
+ */
+export function getISOWeek(date: Date): number {
+  const d = new Date(
+    Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()),
+  );
+  const dayNum = d.getUTCDay() || 7;
+  d.setUTCDate(d.getUTCDate() + 4 - dayNum);
+  const yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
+  return Math.ceil(((d.getTime() - yearStart.getTime()) / 86400000 + 1) / 7);
+}
+
+/**
+ * Format date as YYYY-MM-DD
+ */
+export function formatDate(date: Date): string {
+  return date.toISOString().split("T")[0];
+}
+
+/**
+ * Get all weeks in a date range
+ */
+export function getWeeksInRange(
+  startDate: string,
+  endDate: string,
+): Array<{
+  weekStart: string;
+  weekEnd: string;
+  weekNumber: number;
+}> {
+  const weeks: Array<{
+    weekStart: string;
+    weekEnd: string;
+    weekNumber: number;
+  }> = [];
+
+  const start = new Date(startDate);
+  const end = new Date(endDate);
+  const current = getWeekStart(start);
+
+  while (current <= end) {
+    const weekStart = getWeekStart(current);
+    const weekEnd = getWeekEnd(current);
+
+    weeks.push({
+      weekStart: formatDate(weekStart),
+      weekEnd: formatDate(weekEnd),
+      weekNumber: getISOWeek(current),
+    });
+
+    current.setDate(current.getDate() + 7);
+  }
+
+  return weeks;
+}
+
+/**
+ * Test ISO week calculations
+ */
+export function testISOWeekCalculations(): void {
+  console.log("ISO Week Calculation Tests\n");
+
+  const testDates = [
+    {
+      date: "2024-01-01",
+      expected: { monday: "2024-01-01", sunday: "2024-01-07", week: 1 },
+    },
+    {
+      date: "2024-01-02",
+      expected: { monday: "2024-01-01", sunday: "2024-01-07", week: 1 },
+    },
+    {
+      date: "2024-01-07",
+      expected: { monday: "2024-01-01", sunday: "2024-01-07", week: 1 },
+    },
+    {
+      date: "2024-01-08",
+      expected: { monday: "2024-01-08", sunday: "2024-01-14", week: 2 },
+    },
+    {
+      date: "2024-12-31",
+      expected: { monday: "2024-12-30", sunday: "2025-01-05", week: 1 },
+    }, // Week 1 of 2025
+  ];
+
+  testDates.forEach(({ date, expected }) => {
+    const d = new Date(date);
+    const monday = formatDate(getWeekStart(d));
+    const sunday = formatDate(getWeekEnd(d));
+    const week = getISOWeek(d);
+
+    const mondayMatch = monday === expected.monday;
+    const sundayMatch = sunday === expected.sunday;
+    const weekMatch = week === expected.week;
+
+    console.log(`Date: ${date}`);
+    console.log(
+      `  Monday: ${monday} ${mondayMatch ? "✓" : "✗ (expected: " + expected.monday + ")"}`,
+    );
+    console.log(
+      `  Sunday: ${sunday} ${sundayMatch ? "✓" : "✗ (expected: " + expected.sunday + ")"}`,
+    );
+    console.log(
+      `  Week: ${week} ${weekMatch ? "✓" : "✗ (expected: " + expected.week + ")"}`,
+    );
+    console.log();
+  });
+}
+
+// Run tests if executed directly
+if (typeof require !== "undefined" && require.main === module) {
+  testISOWeekCalculations();
+}
+
+export default {
+  getWeekStart,
+  getWeekEnd,
+  getISOWeek,
+  formatDate,
+  getWeeksInRange,
+  testISOWeekCalculations,
+};