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]/purchase/route.ts

@@ -33,7 +33,12 @@ export async function POST(
     }
 
     const body = await request.json();
-    const { payment_method, buyer_message } = body; // 'pix' | 'tc' | 'gp' | 'trade'
+    const {
+      payment_method,
+      buyer_message,
+      custom_offer_amount,
+      custom_offer_currency,
+    } = body;
 
     if (!payment_method) {
       return NextResponse.json(
@@ -98,6 +103,42 @@ export async function POST(
       );
     }
 
+    let normalizedOfferValue: number | null = null;
+    let normalizedOfferCurrency: string | null = null;
+
+    if (custom_offer_amount !== undefined && custom_offer_amount !== null) {
+      if (!["pix", "tibia_coins", "gold_coins"].includes(normalizedMethod)) {
+        return NextResponse.json(
+          {
+            success: false,
+            error: "Ofertas personalizadas só são permitidas para métodos monetários (PIX, Tibia Coins ou Gold Coins).",
+          },
+          { status: 400 }
+        );
+      }
+
+      const numericOffer = Number(custom_offer_amount);
+      if (Number.isNaN(numericOffer) || numericOffer <= 0) {
+        return NextResponse.json(
+          {
+            success: false,
+            error: "Valor da oferta personalizada deve ser numérico e maior que zero.",
+          },
+          { status: 400 }
+        );
+      }
+
+      normalizedOfferCurrency =
+        custom_offer_currency && ["pix", "tibia_coins", "gold_coins"].includes(custom_offer_currency)
+          ? custom_offer_currency
+          : normalizedMethod;
+
+      normalizedOfferValue =
+        normalizedOfferCurrency === "pix"
+          ? Number(numericOffer.toFixed(2))
+          : Math.floor(numericOffer);
+    }
+
     // Verificar se já existe uma intenção pendente
     const existingIntention = await getPendingIntentionByBuyerAndListing(listingId, auth.userId);
     if (existingIntention) {
@@ -134,6 +175,8 @@ export async function POST(
       buyer_id: auth.userId,
       payment_method: normalizedMethod as any,
       buyer_message: buyer_message || undefined,
+      custom_offer_amount: normalizedOfferValue ?? undefined,
+      custom_offer_currency: normalizedOfferCurrency as any,
     });
 
     // Criar notificação para o vendedor
@@ -141,7 +184,10 @@ export async function POST(
       user_id: listing.seller_id,
       notification_type: "purchase",
       title: "Nova intenção de compra!",
-      message: `Alguém manifestou interesse em comprar seu item "${listing.item_name}" por ${normalizedMethod.toUpperCase()}`,
+      message:
+        normalizedOfferValue && normalizedOfferCurrency
+          ? `Alguém fez uma oferta de ${normalizedOfferCurrency === "pix" ? `R$ ${normalizedOfferValue.toFixed(2)}` : `${normalizedOfferValue.toLocaleString()} ${normalizedOfferCurrency === "tibia_coins" ? "TC" : "GP"}`} pelo item "${listing.item_name}".`
+          : `Alguém manifestou interesse em comprar seu item "${listing.item_name}" por ${normalizedMethod.toUpperCase()}.`,
       related_id: listingId,
       send_whatsapp: false,
     });
@@ -156,6 +202,8 @@ export async function POST(
         listing_price_pix: listing.price_pix ? Number(listing.price_pix) : null,
         listing_price_tc: listing.price_tibia_coins || null,
         listing_price_gp: listing.price_gold_coins ? Number(listing.price_gold_coins) : null,
+        custom_offer_amount: normalizedOfferValue,
+        custom_offer_currency: normalizedOfferCurrency,
       },
     });