Implement ticket links and blocker state

app/Http/Controllers/ProjectTicketController.php

@@ -7,6 +7,7 @@ use App\Actions\Tickets\UpdateProjectTicket;
 use App\Http\Requests\UpdateProjectTicketRequest;
 use App\Models\Project;
 use App\Models\Ticket;
+use App\Models\TicketLink;
 use App\Models\User;
 use Illuminate\Http\RedirectResponse;
 use Illuminate\Http\Request;
@@ -32,6 +33,7 @@ class ProjectTicketController extends Controller
         return Inertia::render('projects/Ticket', [
             'canEditTicket' => $this->projectPermissionService->userHasPermission($request->user(), $project, 'edit'),
             'childTicketTree' => $this->buildChildTicketTree($ticket),
+            'linkedTickets' => $this->linkedTickets($ticket),
             'parentTicketOptions' => Ticket::query()
                 ->where('project_id', $project->id)
                 ->whereNotIn('id', $excludedParentIds)
@@ -54,6 +56,17 @@ class ProjectTicketController extends Controller
                 'worklogEntries.actor',
             ]),
             'ticketFieldDefinitions' => $project->ticketFieldDefinitions()->get(),
+            'ticketLinkOptions' => Ticket::query()
+                ->where('project_id', $project->id)
+                ->whereKeyNot($ticket->id)
+                ->orderByDesc('sequence_number')
+                ->get()
+                ->map(fn (Ticket $linkedTicket): array => [
+                    'id' => $linkedTicket->id,
+                    'ticket_key' => $linkedTicket->ticket_key,
+                    'title' => $linkedTicket->title,
+                ]),
+            'ticketLinkTypes' => $project->ticketLinkTypes()->get(),
             'ticketPriorities' => $project->ticketPriorities()->get(),
             'ticketTypes' => $project->ticketTypes()->get(),
             'users' => User::query()
@@ -124,4 +137,50 @@ class ProjectTicketController extends Controller
             ->values()
             ->all();
     }
+
+    /**
+     * @return array<int, array{
+     *     created_at: string|null,
+     *     id: int,
+     *     linked_ticket: array{id: int, ticket_key: string, title: string},
+     *     source_ticket_id: int,
+     *     target_ticket_id: int,
+     *     ticket_link_type: mixed,
+     *     ticket_link_type_id: int,
+     *     updated_at: string|null
+     * }>
+     */
+    private function linkedTickets(Ticket $ticket): array
+    {
+        return TicketLink::query()
+            ->with(['sourceTicket', 'targetTicket', 'ticketLinkType'])
+            ->where(function ($query) use ($ticket): void {
+                $query
+                    ->where('source_ticket_id', $ticket->id)
+                    ->orWhere('target_ticket_id', $ticket->id);
+            })
+            ->orderBy('id')
+            ->get()
+            ->map(function (TicketLink $ticketLink) use ($ticket): array {
+                $linkedTicket = $ticketLink->source_ticket_id === $ticket->id
+                    ? $ticketLink->targetTicket
+                    : $ticketLink->sourceTicket;
+
+                return [
+                    'created_at' => $ticketLink->created_at?->toISOString(),
+                    'id' => $ticketLink->id,
+                    'linked_ticket' => [
+                        'id' => $linkedTicket->id,
+                        'ticket_key' => $linkedTicket->ticket_key,
+                        'title' => $linkedTicket->title,
+                    ],
+                    'source_ticket_id' => $ticketLink->source_ticket_id,
+                    'target_ticket_id' => $ticketLink->target_ticket_id,
+                    'ticket_link_type' => $ticketLink->ticketLinkType,
+                    'ticket_link_type_id' => $ticketLink->ticket_link_type_id,
+                    'updated_at' => $ticketLink->updated_at?->toISOString(),
+                ];
+            })
+            ->all();
+    }
 }