client brief pdf - upload : add file to field without uploading it if it already exist

public/content/home/home.txt

@@ -22,4 +22,4 @@ Uuid: 6yh1yt2Sk45Y2sOl
 
 ----
 
-Clientbriefimages: - file://ihuGLrw5vll0R4j2
+Clientbriefpdf: home/927346290_au-commencement-du-college-chloe-avait-donc-fait-la-connaissance-dun-garcon.-il-etait-plus-vieux.pdf

public/content/projects/1_miss-dior-blooming-bouquet/1_client-brief/2527557525_au-commencement-du-college-chloe-avait-donc-fait-la-connaissance-dun-garcon.-il-etait-plus-vieux.pdf.txt

@@ -0,0 +1,9 @@
+Date: 2024-10-14 01:15
+
+----
+
+Uuid: xFobejliB3pkAqLr
+
+----
+
+Template: document

public/content/projects/1_miss-dior-blooming-bouquet/1_client-brief/client-brief.txt

@@ -10,7 +10,7 @@ Clientbriefpdf:
 
 ----
 
-Description: description
+Description: 
 
 ----
 

public/site/config/config.php

@@ -25,6 +25,7 @@ return [
     require(__DIR__ . '/routes/save-page.php'),
     require(__DIR__ . '/routes/save-file.php'),
     require(__DIR__ . '/routes/remove-file.php'),
+    require(__DIR__ . '/routes/upload-pdf.php'),
   ],
   'hooks' => [
     'page.create:after' => require_once(__DIR__ . '/hooks/create-steps.php'),

public/site/config/routes/upload-pdf.php

@@ -0,0 +1,57 @@
+<?php
+
+return [
+  'pattern' => 'upload-pdf.json',
+  'method' => 'POST',
+  'action' => function () {    
+    $kirby = kirby();
+    $request = $kirby->request();
+
+    $files = $request->files();
+    $data = $request->data();
+
+    $upload = $files->get('file') ?? null;
+
+    $pageUri = $request->query()->get('pageUri');
+    $page = page($pageUri);
+
+    if (!$page) {
+      return [
+        'error' => 'Invalid page.',
+      ];
+    }
+
+    try {
+      $name = crc32($upload['name'] . microtime()) . '_' . $upload['name'];
+      
+      $existingFileId = $page->clientBriefPdf()->id() ?? null;
+
+      if ($existingFileId) {
+        $existingFile = $kirby->file($existingFileId);
+        if ($existingFile) {
+          $existingFile->delete();
+        }
+      }
+
+      $newFile = $page->createFile([
+        'source'   => $upload['tmp_name'],
+        'filename' => $name,
+        'template' => 'document',
+        'content'  => [
+            'date' => date('Y-m-d h:i')
+        ]
+      ]);
+
+      $newPage = $page->update([
+        "clientBriefPdf" => $newFile->id()
+      ]);
+
+      return $newPage->toArray();
+
+    } catch (Exception $e) {
+      return [
+        'error' => $e->getMessage(),
+      ];
+    }
+  }
+];