feat: enhance purchase intentions with chat integration and offer tracking

- Added MongoDB chat/message integration for seller responses
- Improved seller response validation and default messaging
- Integrated automatic chat creation/update when responding to intentions
- Added highest custom offer fields to listing queries and models
- Enhanced listing data with top offer information for buyers

app/api/listings/[id]/intentions/[intentionId]/route.ts

@@ -7,6 +7,11 @@ import {
   updatePurchaseIntentionStatus,
 } from "@/lib/prisma/queries/purchase-intentions";
 import { createNotification } from "@/lib/prisma/queries/notifications";
+import { connectMongoDB } from "@/lib/mongodb/connection";
+import { Chat } from "@/lib/mongodb/models/Chat";
+import { Message } from "@/lib/mongodb/models/Message";
+import { getUserById } from "@/lib/prisma/queries/users";
+import { getMainCharacter } from "@/lib/prisma/queries/characters";
 
 /**
  * GET /api/listings/[id]/intentions/[intentionId]
@@ -88,6 +93,10 @@ export async function PATCH(
 
     const body = await request.json();
     const { status, seller_response } = body;
+    const sellerResponse =
+      typeof seller_response === "string" && seller_response.trim().length > 0
+        ? seller_response
+        : undefined;
 
     if (!status || !["accepted", "rejected"].includes(status)) {
       return NextResponse.json(
@@ -134,9 +143,17 @@ export async function PATCH(
     const updatedIntention = await updatePurchaseIntentionStatus(
       intentionId,
       status,
-      seller_response
+      sellerResponse
     );
 
+    await sendSellerResponseToChat({
+      listing,
+      intention,
+      status,
+      sellerResponse,
+      sellerId: authResult.userId,
+    });
+
     // Criar notificação para o comprador
     await createNotification({
       user_id: intention.buyer_id,
@@ -177,3 +194,94 @@ export async function PATCH(
   }
 }
 
+async function sendSellerResponseToChat({
+  listing,
+  intention,
+  status,
+  sellerResponse,
+  sellerId,
+}: {
+  listing: Awaited<ReturnType<typeof getListingById>>;
+  intention: Exclude<Awaited<ReturnType<typeof getPurchaseIntentionById>>, null>;
+  status: "accepted" | "rejected";
+  sellerResponse?: string;
+  sellerId: number;
+}) {
+  try {
+    if (!listing) return;
+
+    const contentBase = sellerResponse?.trim()
+      ? sellerResponse.trim()
+      : status === "accepted"
+        ? "O vendedor aceitou sua intenção de compra."
+        : "O vendedor rejeitou sua intenção de compra.";
+
+    const content = `[Intenções] ${contentBase}`;
+    if (!content.trim()) return;
+
+    const chatId = `${listing.listing_id}_${intention.buyer_id}_${listing.seller_id}`;
+
+    await connectMongoDB();
+    let chat = await Chat.findOne({ chat_id: chatId });
+
+    if (!chat) {
+      const [buyer, seller, buyerCharacter, sellerCharacter] = await Promise.all([
+        getUserById(intention.buyer_id),
+        getUserById(listing.seller_id),
+        getMainCharacter(intention.buyer_id),
+        getMainCharacter(listing.seller_id),
+      ]);
+
+      chat = new Chat({
+        chat_id: chatId,
+        listing_id: listing.listing_id,
+        buyer_id: intention.buyer_id,
+        seller_id: listing.seller_id,
+        buyer_unread_count: 0,
+        seller_unread_count: 0,
+        is_active: listing.listing_status === "active",
+        listing_cache: {
+          item_name: listing.item_name,
+          item_image_url: null,
+          price_pix: listing.price_pix ?? null,
+          price_tibia_coins: listing.price_tibia_coins ?? null,
+          price_gold_coins: listing.price_gold_coins ?? null,
+          server_name: listing.server_name,
+          listing_status: listing.listing_status,
+        },
+        buyer_cache: {
+          user_id: buyer?.user_id ?? intention.buyer_id,
+          username: buyer?.username ?? intention.buyer?.username ?? "Comprador",
+          character_name: buyerCharacter?.character_name || null,
+        },
+        seller_cache: {
+          user_id: seller?.user_id ?? listing.seller_id,
+          username: seller?.username ?? "Vendedor",
+          character_name: sellerCharacter?.character_name || null,
+        },
+      });
+
+      await chat.save();
+    }
+
+    const message = new Message({
+      chat_id: chat.chat_id,
+      sender_id: sellerId,
+      content,
+      message_type: "text",
+    });
+    await message.save();
+
+    chat.last_message_at = new Date();
+    chat.last_message_preview = content.substring(0, 100);
+    chat.buyer_unread_count = (chat.buyer_unread_count || 0) + 1;
+    chat.is_active = listing.listing_status === "active";
+    await chat.save();
+  } catch (error) {
+    secureLogger.error("❌ Falha ao enviar resposta para o chat", {
+      error: error instanceof Error ? error.message : "Erro desconhecido",
+      stack: error instanceof Error ? error.stack : undefined,
+    });
+  }
+}
+