From 42985da24487a79d7b21d46d1626c16b6cff8e8c Mon Sep 17 00:00:00 2001
From: Glydric <git@miglio.dev>
Date: Mon, 22 Jan 2024 16:52:38 +0100
Subject: [PATCH] added limit to filtering

---
 .../src/app/frontend/frontend.controller.ts   | 14 ++++++++
 Backend/src/database/database.service.ts      | 33 ++++++++++---------
 2 files changed, 32 insertions(+), 15 deletions(-)

diff --git a/Backend/src/app/frontend/frontend.controller.ts b/Backend/src/app/frontend/frontend.controller.ts
index 24f6748..e0b5e50 100644
--- a/Backend/src/app/frontend/frontend.controller.ts
+++ b/Backend/src/app/frontend/frontend.controller.ts
@@ -71,6 +71,20 @@ export class FrontendController {
     return this.databaseService.getData(filter);
   }
 
+  @ApiParam(filterParams)
+  @ApiParam({
+    name: 'limit',
+    type: 'number',
+    example: 10,
+  })
+  @Get(`:filter(${filters.join('|')})/:limit(\\d+)`)
+  getValuesLimit(
+    @Param('filter', FiltersValidator) filter: FiltersAvailable,
+    @Param('limit', PositiveNumberValidator) limit: number,
+  ) {
+    return this.databaseService.getData(filter, limit);
+  }
+
   @ApiParam({
     name: 'id',
     type: 'number',
diff --git a/Backend/src/database/database.service.ts b/Backend/src/database/database.service.ts
index 78a7cf2..4be9756 100644
--- a/Backend/src/database/database.service.ts
+++ b/Backend/src/database/database.service.ts
@@ -71,25 +71,28 @@ export class DatabaseService {
     return await col.insertOne(data);
   }
 
-  getData(filter?: FiltersAvailable): Promise<Document[]> {
-    return this.DB.collection('cameras')
-      .aggregate([
-        {
-          $addFields: {
-            intrusionDetection: {
-              $cond: {
-                if: {
-                  $ifNull: ['$intrusionDetection', false],
-                },
-                then: true,
-                else: false,
+  getData(
+    filter: FiltersAvailable,
+    limit: number = undefined,
+  ): Promise<Document[]> {
+    const res = this.DB.collection('cameras').aggregate([
+      {
+        $addFields: {
+          intrusionDetection: {
+            $cond: {
+              if: {
+                $ifNull: ['$intrusionDetection', false],
               },
+              then: true,
+              else: false,
             },
           },
         },
-      ])
-      .match(this.getFilter(filter))
-      .toArray();
+      },
+    ]);
+    if (limit != undefined)
+      return res.limit(limit).match(this.getFilter(filter)).toArray();
+    else return res.match(this.getFilter(filter)).toArray();
   }
 
   aggregateCamera(filter?: FiltersAvailable): Promise<Document[]> {