messages implemented

app/Services/Messaging/MessageNotificationService.php

@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\Messaging;
+
+use App\Models\Conversation;
+use App\Models\ConversationParticipant;
+use App\Models\Message;
+use App\Models\User;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Str;
+
+class MessageNotificationService
+{
+    public function notifyNewMessage(Conversation $conversation, Message $message, User $sender): void
+    {
+        if (! DB::getSchemaBuilder()->hasTable('notifications')) {
+            return;
+        }
+
+        $recipientIds = ConversationParticipant::query()
+            ->where('conversation_id', $conversation->id)
+            ->whereNull('left_at')
+            ->where('user_id', '!=', $sender->id)
+            ->where('is_muted', false)
+            ->where('is_archived', false)
+            ->pluck('user_id')
+            ->all();
+
+        if (empty($recipientIds)) {
+            return;
+        }
+
+        $recipientRows = User::query()
+            ->whereIn('id', $recipientIds)
+            ->get()
+            ->filter(fn (User $recipient) => $recipient->allowsMessagesFrom($sender))
+            ->pluck('id')
+            ->map(fn ($id) => (int) $id)
+            ->values()
+            ->all();
+
+        if (empty($recipientRows)) {
+            return;
+        }
+
+        $preview = Str::limit((string) $message->body, 120, '…');
+        $now = now();
+
+        $rows = array_map(static fn (int $recipientId) => [
+            'user_id' => $recipientId,
+            'type' => 'message',
+            'data' => json_encode([
+                'conversation_id' => $conversation->id,
+                'sender_id' => $sender->id,
+                'sender_name' => $sender->username,
+                'preview' => $preview,
+                'message_id' => $message->id,
+            ], JSON_UNESCAPED_UNICODE),
+            'read_at' => null,
+            'created_at' => $now,
+            'updated_at' => $now,
+        ], $recipientRows);
+
+        DB::table('notifications')->insert($rows);
+    }
+}