modify clockin & leave

lib/leave/leave_form.dart

@@ -60,6 +60,18 @@ class _LeaveFormState extends State<LeaveForm> {
       final start = DateTime(_startDate.year, _startDate.month, _startDate.day, _startTime.hour, _startTime.minute);
       final end = DateTime(_endDate.year, _endDate.month, _endDate.day, _endTime.hour, _endTime.minute);
 
+      // 檢查結束時間是否大於開始時間
+      if (end.isBefore(start) || end.isAtSameMomentAs(start)) {
+        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('結束時間必須大於開始時間')));
+        return;
+      }
+
+      // 修正 2: 自動推算天數與小時 (簡易版：假設一天 8 小時工作制)
+      final duration = end.difference(start);
+      final double totalHours = duration.inMinutes / 60.0;
+      final double calcDays = (totalHours / 8).floorToDouble();
+      final double calcHours = totalHours % 8;
+
       final newLeave = Leave(
         billNo: '', // API 端生成
         personId: widget.userId,
@@ -67,8 +79,8 @@ class _LeaveFormState extends State<LeaveForm> {
         leaveType: _selectedType!.id, // 傳送 ID 給後端
         startTime: start,
         endTime: end,
-        days: 1.0, // 簡化處理，實際可依 start/end 計算
-        hours: 8.0,
+        days: calcDays,   // 寫入計算後的天數
+        hours: calcHours, // 寫入計算後的小時
         leaveNote: _note,
       );