refactor: Use ActivityService to create system messages in seeder

app/Http/Controllers/PredefinedMutationController.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Dynamic;
+use App\Models\PredefinedMutation;
+use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
+use Illuminate\Http\Request;
+use Inertia\Inertia;
+
+class PredefinedMutationController extends Controller
+{
+    use AuthorizesRequests;
+
+    /**
+     * Display a listing of the resource.
+     */
+    public function index(Dynamic $dynamic)
+    {
+        $this->authorize('update', $dynamic);
+
+        return Inertia::render('Dynamics/PredefinedMutations/Index', [
+            'dynamic' => $dynamic,
+            'predefined_mutations' => $dynamic->predefinedMutations()->latest()->get(),
+        ]);
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     */
+    public function store(Request $request, Dynamic $dynamic)
+    {
+        $this->authorize('update', $dynamic);
+
+        $request->validate([
+            'name' => ['required', 'string', 'max:255'],
+            'description' => ['nullable', 'string'],
+            'amount' => ['required', 'integer'],
+            'type' => ['required', 'string', 'in:reward,penalty'],
+        ]);
+
+        $dynamic->predefinedMutations()->create($request->all());
+
+        return redirect()->route('dynamics.predefined-mutations.index', $dynamic);
+    }
+}

app/Models/Mutation.php

@@ -20,6 +20,7 @@ class Mutation extends Model
         'amount',
         'description',
         'status',
+        'predefined_mutation_id',
     ];
 
     public function ledger(): BelongsTo
@@ -32,6 +33,11 @@ class Mutation extends Model
         return $this->belongsTo(User::class);
     }
 
+    public function predefinedMutation(): BelongsTo
+    {
+        return $this->belongsTo(PredefinedMutation::class);
+    }
+
     public function chat(): MorphOne
     {
         return $this->morphOne(Chat::class, 'chatable');

app/Models/PredefinedMutation.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class PredefinedMutation extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'dynamic_id',
+        'name',
+        'description',
+        'amount',
+        'type',
+    ];
+
+    public function dynamic(): BelongsTo
+    {
+        return $this->belongsTo(Dynamic::class);
+    }
+}

app/Services/ActivityService.php

@@ -45,6 +45,31 @@ class ActivityService
         return $cursor ? $cursor->read_at : Carbon::parse('1970-01-01');
     }
 
+    public function createMessage($chat, $user, $content, $subject = null)
+    {
+        $message = $chat->messages()->create([
+            'user_id' => $user ? $user->id : null,
+            'content' => $content,
+            'subject_id' => $subject ? $subject->id : null,
+            'subject_type' => $subject ? get_class($subject) : null,
+        ]);
+
+        return $message;
+    }
+
+    public function createMutation($ledger, $user, $type, $amount, $description, $status)
+    {
+        $mutation = $ledger->mutations()->create([
+            'user_id' => $user->id,
+            'type' => $type,
+            'amount' => $amount,
+            'description' => $description,
+            'status' => $status,
+        ]);
+
+        return $mutation;
+    }
+
     /**
      * Retrieve all activities for a given entity.
      */