Merge pull request #136 from utaipei-sa/marvelcn015/urb-76-物品有交集的時間段就…

…算總預約數量超過可預約數量也可以預約並驗證成功

Fix: prevert from reserving overlapping items

routes/reserve/post_reserve.js

@@ -209,7 +209,7 @@ router.post('/reserve', [
             start_datetime
           ) &&
           received_space_reserved_time[i].space_id ===
-            space_reservation.space_id
+          space_reservation.space_id
         ) {
           stop_flag = 1
           break
@@ -371,26 +371,47 @@ router.post('/reserve', [
   let db_item_check
   let max_quantity
   for (let i = 0; i < received_item_reserved_time.length; i++) {
-    max_quantity = await ItemRepository.findItemById(received_item_reserved_time[i].item_id)
+    const current_reservation = received_item_reserved_time[i]
+    max_quantity = await ItemRepository.findItemById(current_reservation.item_id)
+
+    let total_reserved_quantity = current_reservation.reserved_quantity
+
     db_item_check = await ItemRepository.findSlotByStartTime(
-      received_item_reserved_time[i].item_id,
-      received_item_reserved_time[i].start_datetime
+      current_reservation.item_id,
+      current_reservation.start_datetime
     )
-    const item_reserved_quantity = db_item_check?.reserved_quantity || 0
-    if (
-      item_reserved_quantity <=
-      max_quantity?.quantity - received_item_reserved_time[i].reserved_quantity
-    ) continue
 
-    res
-      .status(400)
-      .json(
+    if (db_item_check?.reserved_quantity) {
+      total_reserved_quantity += db_item_check.reserved_quantity
+    }
+
+    for (let j = 0; j < received_item_reserved_time.length; j++) {
+      if (i === j) continue // 跳過自己
+
+      const other_reservation = received_item_reserved_time[j]
+      if (current_reservation.item_id.toString() !== other_reservation.item_id.toString()) continue
+
+      // 檢查時間是否重疊
+      const current_start = dayjs(current_reservation.start_datetime)
+      const current_end = dayjs(current_reservation.end_datetime)
+      const other_start = dayjs(other_reservation.start_datetime)
+      const other_end = dayjs(other_reservation.end_datetime)
+
+      if (current_start.isBefore(other_end) && other_start.isBefore(current_end)) {
+        total_reserved_quantity += other_reservation.reserved_quantity
+      }
+    }
+
+    // 檢查總預約數量是否超過限制
+    if (total_reserved_quantity > max_quantity.quantity) {
+      res.status(400).json(
         error_response(
           R_INVALID_RESERVATION,
           'item_datetime has over reserved error'
         )
       )
-    return
+      return
+    }
   }
 
   // insert reservation into database