Implement ticket statuses

app/Http/Requests/MoveProjectTicketRequest.php

@@ -3,9 +3,12 @@
 namespace App\Http\Requests;
 
 use App\Models\Project;
+use App\Models\Ticket;
 use Illuminate\Contracts\Validation\ValidationRule;
 use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Support\Arr;
 use Illuminate\Validation\Rule;
+use Illuminate\Validation\Validator;
 
 class MoveProjectTicketRequest extends FormRequest
 {
@@ -28,12 +31,48 @@ class MoveProjectTicketRequest extends FormRequest
         $project = $this->route('project');
 
         return [
-            'board_column_id' => [
-                'nullable',
+            'ticket_status_id' => [
+                'required',
                 'integer',
-                Rule::exists('board_columns', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_statuses', 'id')->where('project_id', $project->id),
             ],
             'redirect_to' => ['required', 'string', Rule::in(['backlog', 'board'])],
         ];
     }
+
+    /**
+     * @return array<int, callable(Validator): void>
+     */
+    public function after(): array
+    {
+        return [
+            function (Validator $validator): void {
+                if ($validator->errors()->isNotEmpty()) {
+                    return;
+                }
+
+                /** @var Ticket $ticket */
+                $ticket = $this->route('ticket');
+                $validated = $validator->validated();
+                $ticketStatusId = (int) Arr::get($validated, 'ticket_status_id');
+
+                if ($ticket->ticket_status_id === $ticketStatusId) {
+                    return;
+                }
+
+                $ticket->loadMissing('ticketStatus');
+
+                $isAllowed = $ticket->ticketStatus?->allowedTargetStatuses()
+                    ->whereKey($ticketStatusId)
+                    ->exists() ?? false;
+
+                if (! $isAllowed) {
+                    $validator->errors()->add(
+                        'ticket_status_id',
+                        'Choose a status this ticket is allowed to move to.',
+                    );
+                }
+            },
+        ];
+    }
 }