fix: refine schedule overlap validation in ScheduleSchema

- Updated the logic for checking overlapping schedules by querying existing schedule dates for the same user, improving accuracy in overlap detection.
- Simplified the overlap validation process by consolidating checks into a single function, enhancing code clarity and maintainability.
- This change aims to strengthen the integrity of scheduling operations and provide clearer error messages for users regarding scheduling conflicts.

src/Schedule/schedule.schema.ts

@@ -492,51 +492,28 @@ d72a864e-2f41-45ab-9c9b-bf0512a31883,e9be51fd-2382-4e43-9988-74e76fde4b56,2024-1
             throw new Error("Overlapping schedule");
           }
 
-          // check if scheduleDate have overlap with other scheduleDate of same user
-          const existingUserScheduleDates =
+          // check if scheduleDate have overlap with other scheduleDate of same user by query all scheduleDate of same user
+          const existingScheduleDatesOfSameUser =
             await this.prisma.scheduleDate.findMany({
               where: {
-                AND: [
-                  {
-                    participantIds: {
-                      has: ctx.me?.id ?? "",
+                schedule: {
+                  managedService: {
+                    mentorId: ctx.me.id,
                   },
                 },
-                  {
-                    status: {
-                      notIn: [
-                        ScheduleDateStatus.COMPLETED,
-                        ScheduleDateStatus.EXPIRED,
-                      ],
-                    },
-                  },
-                  {
-                    end: {
-                      gte: DateTimeUtils.now().toJSDate(),
-                    },
-                  },
-                ],
               },
             });
 
-          // First, generate the preview schedule dates
-          const previewScheduleDates = previewSchedule.slots.map((slot) => ({
+          const hasOverlap = DateTimeUtils.isOverlaps(
+            previewSchedule.slots.map((slot) => ({
               start: DateTimeUtils.fromIsoString(slot.start),
               end: DateTimeUtils.fromIsoString(slot.end),
-          }));
-
-          // Check if new schedule overlaps with any existing schedule dates for the user
-          const hasOverlap = existingUserScheduleDates.some((existingDate) =>
-            previewScheduleDates.some((newScheduleDate) =>
-              DateTimeUtils.isOverlap(
-                DateTimeUtils.fromDate(existingDate.start),
-                DateTimeUtils.fromDate(existingDate.end),
-                newScheduleDate.start,
-                newScheduleDate.end
-              )
-            )
+            })),
+            existingScheduleDatesOfSameUser.map((date) => ({
+              start: DateTimeUtils.fromDate(date.start),
+              end: DateTimeUtils.fromDate(date.end),
+            }))
           );
-
           if (hasOverlap) {
             throw new Error(
               "Schedule date has overlap with existing schedule dates"