Separated laravel app to its own folder (#540)

api/app/Rules/MatrixValidationRule.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class MatrixValidationRule implements ValidationRule
+{
+    protected $field;
+    protected $isRequired;
+
+    public function __construct(array $field, bool $isRequired)
+    {
+        $this->field = $field;
+        $this->isRequired = $isRequired;
+    }
+
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (!$this->isRequired && empty($value)) {
+            return; // If not required and empty, validation passes
+        }
+
+        if (!is_array($value)) {
+            $fail('The Matrix field must be an array.');
+            return;
+        }
+
+        $rows = $this->field['rows'];
+        $columns = $this->field['columns'];
+
+        foreach ($rows as $row) {
+            if (!array_key_exists($row, $value)) {
+                if ($this->isRequired) {
+                    $fail("Missing value for row '{$row}'.");
+                }
+                continue;
+            }
+
+            $cellValue = $value[$row];
+
+            if ($cellValue === null) {
+                if ($this->isRequired) {
+                    $fail("Value for row '{$row}' is required.");
+                }
+                continue;
+            }
+
+            if (!in_array($cellValue, $columns)) {
+                $fail("Invalid value '{$cellValue}' for row '{$row}'.");
+            }
+        }
+
+        // Check for extra rows that shouldn't be there
+        $extraRows = array_diff(array_keys($value), $rows);
+        foreach ($extraRows as $extraRow) {
+            $fail("Unexpected row '{$extraRow}' in the matrix.");
+        }
+    }
+}