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

components/admin/AdminSubscriptionTab.tsx

@@ -0,0 +1,50 @@
+"use client";
+
+import { AdminSubscriptionDashboard } from "@/components/admin/subscription-dashboard";
+import { Card, CardContent } from "@/components/ui/card";
+
+interface AdminSubscriptionTabProps {
+  initialTiers: any[];
+  adminUser: {
+    subscription_tier?: {
+      name: string;
+      slug: string;
+    } | null;
+  } | null;
+}
+
+export function AdminSubscriptionTab({
+  initialTiers,
+  adminUser,
+}: AdminSubscriptionTabProps) {
+  return (
+    <div className="space-y-6">
+      <Card>
+        <CardContent className="pt-6">
+          <div className="space-y-2">
+            <h2 className="text-2xl font-semibold tracking-tight">
+              Assinaturas & Permissões
+            </h2>
+            <p className="text-sm text-muted-foreground max-w-2xl">
+              Configure planos, recursos e vincule usuários às assinaturas
+              disponíveis. Todas as alterações são aplicadas imediatamente
+              após salvar.
+            </p>
+            {adminUser?.subscription_tier && (
+              <p className="text-xs text-muted-foreground">
+                Seu plano atual:{" "}
+                <span className="font-semibold uppercase">
+                  {adminUser.subscription_tier.name} (
+                  {adminUser.subscription_tier.slug})
+                </span>
+              </p>
+            )}
+          </div>
+        </CardContent>
+      </Card>
+
+      <AdminSubscriptionDashboard initialTiers={initialTiers} />
+    </div>
+  );
+}
+

components/marketplace/AdCard.tsx

@@ -68,10 +68,12 @@ interface Listing {
   // Campo do vendedor
   seller_character_name?: string | null;
   has_pending_intention_for_current_user?: boolean;
+  highest_custom_offer_amount?: number | string | null;
+  highest_custom_offer_currency?: string | null;
 }
 
 interface PriceInfo {
-  type: "pix" | "tc" | "gp" | "trade";
+  type: "pix" | "tibia_coins" | "gold_coins" | "trade";
   label: string;
   value: string;
 }
@@ -227,7 +229,7 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
         : listing.price_tibia_coins;
       if (!isNaN(price)) {
         prices.push({
-          type: "tc",
+          type: "tibia_coins",
           label: "TC",
           value: `${price.toLocaleString()} TC`,
         });
@@ -241,7 +243,7 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
         : listing.price_gold_coins;
       if (!isNaN(price)) {
         prices.push({
-          type: "gp",
+          type: "gold_coins",
           label: "GP",
           value: `${price.toLocaleString()} GP`,
         });
@@ -266,6 +268,35 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
   const isSold = listing.listing_status === "sold";
   const hasPendingIntention = Boolean(listing.has_pending_intention_for_current_user);
 
+  const getHighestOfferLabel = () => {
+    if (
+      listing.highest_custom_offer_amount === null ||
+      listing.highest_custom_offer_amount === undefined ||
+      !listing.highest_custom_offer_currency
+    ) {
+      return null;
+    }
+    const amount =
+      typeof listing.highest_custom_offer_amount === "string"
+        ? Number(listing.highest_custom_offer_amount)
+        : listing.highest_custom_offer_amount;
+    if (Number.isNaN(amount)) {
+      return null;
+    }
+    switch (listing.highest_custom_offer_currency) {
+      case "pix":
+        return `Maior oferta: R$ ${amount.toFixed(2)}`;
+      case "tibia_coins":
+        return `Maior oferta: ${Math.round(amount).toLocaleString()} TC`;
+      case "gold_coins":
+        return `Maior oferta: ${Math.round(amount).toLocaleString()} GP`;
+      default:
+        return `Maior oferta: ${amount}`;
+    }
+  };
+
+  const highestOfferLabel = getHighestOfferLabel();
+
   // Função para obter URL da imagem do item
   const getItemImageUrl = (): string => {
     // Prioridade 1: image_url (URL externa) se disponível
@@ -327,9 +358,9 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
       switch (type) {
         case "pix":
           return "bg-green-100 hover:bg-green-200 dark:bg-green-900/30 dark:hover:bg-green-900/50 text-green-700 dark:text-green-300 border-green-300 dark:border-green-700";
-        case "tc":
+        case "tibia_coins":
           return "bg-blue-100 hover:bg-blue-200 dark:bg-blue-900/30 dark:hover:bg-blue-900/50 text-blue-700 dark:text-blue-300 border-blue-300 dark:border-blue-700";
-        case "gp":
+        case "gold_coins":
           return "bg-amber-100 hover:bg-amber-200 dark:bg-amber-900/30 dark:hover:bg-amber-900/50 text-amber-700 dark:text-amber-300 border-amber-300 dark:border-amber-700";
         case "trade":
           return "bg-purple-100 hover:bg-purple-200 dark:bg-purple-900/30 dark:hover:bg-purple-900/50 text-purple-700 dark:text-purple-300 border-purple-300 dark:border-purple-700";
@@ -342,8 +373,8 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
       switch (type) {
         case "pix":
           return <DollarSign className="h-3 w-3" />;
-        case "tc":
-        case "gp":
+        case "tibia_coins":
+        case "gold_coins":
           return <Coins className="h-3 w-3" />;
         case "trade":
           return <RefreshCw className="h-3 w-3" />;
@@ -554,7 +585,14 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
                     listing.is_featured && "p-2 rounded-lg border-l-4 bg-yellow-500/5 border-yellow-500",
                     "overflow-hidden"
                   )}>
-                    <PriceBadges prices={availablePrices} compact tradeItemImageUrl={tradeItemImageUrl} listing={listing} />
+                    <div className="space-y-1">
+                      <PriceBadges prices={availablePrices} compact tradeItemImageUrl={tradeItemImageUrl} listing={listing} />
+                      {highestOfferLabel && (
+                        <div className="text-xs font-medium text-primary/80">
+                          {highestOfferLabel}
+                        </div>
+                      )}
+                    </div>
                   </div>
                 )}
                 
@@ -846,7 +884,14 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
               listing.is_featured && "p-2 rounded-lg border-l-4 bg-yellow-500/5 border-yellow-500",
               "overflow-hidden"
             )}>
-              <PriceBadges prices={availablePrices} tradeItemImageUrl={tradeItemImageUrl} listing={listing} />
+              <div className="space-y-1">
+                <PriceBadges prices={availablePrices} tradeItemImageUrl={tradeItemImageUrl} listing={listing} />
+                {highestOfferLabel && (
+                  <div className="text-xs font-medium text-primary/80">
+                    {highestOfferLabel}
+                  </div>
+                )}
+              </div>
             </div>
           )}
           

components/marketplace/CreateAdModal.tsx

@@ -139,7 +139,31 @@ export function CreateAdModal({ open, onOpenChange, onSuccess }: CreateAdModalPr
       const data = await response.json();
 
       if (!response.ok) {
-        setError(data.error || "Erro ao criar anúncio");
+        if (data?.details?.length) {
+          const fieldLabels: Record<string, string> = {
+            item_id: "Item",
+            item_id_unified: "Item",
+            item_name: "Nome do item",
+            quantity: "Quantidade",
+            server_name: "Servidor",
+            price_pix: "Preço PIX",
+            price_tibia_coins: "Preço Tibia Coins",
+            price_gold_coins: "Preço Gold Coins",
+            trade_item_id: "Item de troca",
+            trade_item_name: "Nome do item de troca",
+            trade_item_quantity: "Quantidade do item de troca",
+            auction_ends_at: "Término do leilão",
+          };
+
+          const validationMessages = data.details.map((detail: { field?: string; message?: string }) => {
+            const fieldLabel = detail.field ? fieldLabels[detail.field] || detail.field : "Campo";
+            return `${fieldLabel}: ${detail.message ?? "preenchimento obrigatório"}`;
+          });
+
+          setError(validationMessages.join(" "));
+        } else {
+          setError(data?.error || "Erro ao criar anúncio");
+        }
         setLoading(false);
         return;
       }

components/marketplace/IntentionDetailModal.tsx

@@ -35,6 +35,9 @@ interface PurchaseIntention {
   buyer_message: string | null;
   seller_response: string | null;
   created_at: string;
+  custom_offer_amount: number | null;
+  custom_offer_currency: string | null;
+  custom_offer_created_at: string | null;
   buyer?: {
     user_id: number;
     username: string;
@@ -93,6 +96,40 @@ function getStatusBadge(status: string) {
   }
 }
 
+function formatCustomOffer(intention: PurchaseIntention): { value: string; date: string | null } | null {
+  if (
+    intention.custom_offer_amount === null ||
+    intention.custom_offer_amount === undefined ||
+    !intention.custom_offer_currency
+  ) {
+    return null;
+  }
+
+  const amount = intention.custom_offer_amount;
+  let value: string;
+
+  switch (intention.custom_offer_currency) {
+    case "pix":
+      value = `R$ ${amount.toFixed(2)}`;
+      break;
+    case "tibia_coins":
+      value = `${Math.round(amount).toLocaleString("pt-BR")} TC`;
+      break;
+    case "gold_coins":
+      value = `${Math.round(amount).toLocaleString("pt-BR")} GP`;
+      break;
+    default:
+      value = amount.toLocaleString("pt-BR");
+  }
+
+  return {
+    value,
+    date: intention.custom_offer_created_at
+      ? new Date(intention.custom_offer_created_at).toLocaleString("pt-BR")
+      : null,
+  };
+}
+
 export function IntentionDetailModal({
   open,
   onOpenChange,
@@ -126,6 +163,13 @@ export function IntentionDetailModal({
   const isOwner = user && listing && user.userId === listing.seller_id;
   const canMarkAsSold = isOwner && listing && (listing.listing_status === "active" || listing.listing_status === "in_escrow");
   const canAcceptOrReject = intention.status === "pending";
+  const customOffer = formatCustomOffer(intention);
+
+  useEffect(() => {
+    if (open) {
+      setSellerResponse(intention.seller_response ?? "");
+    }
+  }, [open, intention.intention_id, intention.seller_response]);
 
   const handleAccept = async () => {
     setLoading(true);
@@ -279,6 +323,18 @@ export function IntentionDetailModal({
               </div>
             </div>
 
+            {customOffer && (
+              <div className="bg-primary/5 border border-primary/20 rounded-lg p-3 space-y-1">
+                <Label className="text-xs text-primary uppercase tracking-wide">
+                  Oferta do Comprador
+                </Label>
+                <div className="text-base font-semibold text-primary">{customOffer.value}</div>
+                {customOffer.date && (
+                  <p className="text-[11px] text-primary/70">Enviada em {customOffer.date}</p>
+                )}
+              </div>
+            )}
+
             {/* Mensagem do comprador */}
             {intention.buyer_message && (
               <div>

components/marketplace/ListingDetailsModal.tsx

@@ -61,6 +61,8 @@ interface Listing {
   image_url?: string | null;
   item_category?: string | null;
   seller_character_name?: string | null;
+  highest_custom_offer_amount?: number | string | null;
+  highest_custom_offer_currency?: string | null;
 }
 
 interface ListingDetailsModalProps {
@@ -165,14 +167,14 @@ export function ListingDetailsModal({
     if (listing.price_tibia_coins) {
       const price = typeof listing.price_tibia_coins === "string" ? parseInt(listing.price_tibia_coins, 10) : listing.price_tibia_coins;
       if (!isNaN(price)) {
-        prices.push({ type: "tc", label: "Tibia Coins", value: `${price.toLocaleString()} TC` });
+        prices.push({ type: "tibia_coins", label: "Tibia Coins", value: `${price.toLocaleString()} TC` });
       }
     }
 
     if (listing.price_gold_coins) {
       const price = typeof listing.price_gold_coins === "string" ? parseInt(listing.price_gold_coins, 10) : listing.price_gold_coins;
       if (!isNaN(price)) {
-        prices.push({ type: "gp", label: "Gold Coins", value: `${price.toLocaleString()} GP` });
+        prices.push({ type: "gold_coins", label: "Gold Coins", value: `${price.toLocaleString()} GP` });
       }
     }
 
@@ -188,6 +190,32 @@ export function ListingDetailsModal({
   };
 
   const prices = getAvailablePrices();
+  const highestOfferLabel = (() => {
+    if (
+      listing.highest_custom_offer_amount === null ||
+      listing.highest_custom_offer_amount === undefined ||
+      !listing.highest_custom_offer_currency
+    ) {
+      return null;
+    }
+    const amount =
+      typeof listing.highest_custom_offer_amount === "string"
+        ? Number(listing.highest_custom_offer_amount)
+        : listing.highest_custom_offer_amount;
+    if (Number.isNaN(amount)) {
+      return null;
+    }
+    switch (listing.highest_custom_offer_currency) {
+      case "pix":
+        return `Maior oferta registrada: R$ ${amount.toFixed(2)}`;
+      case "tibia_coins":
+        return `Maior oferta registrada: ${Math.round(amount).toLocaleString()} TC`;
+      case "gold_coins":
+        return `Maior oferta registrada: ${Math.round(amount).toLocaleString()} GP`;
+      default:
+        return `Maior oferta registrada: ${amount}`;
+    }
+  })();
   // Apenas o dono pode realizar ações
   const canPause = isOwner && listing.listing_status === "active";
   const canActivate = isOwner && listing.listing_status === "cancelled";
@@ -314,9 +342,9 @@ export function ListingDetailsModal({
                   className={`p-3 rounded-lg border ${
                     price.type === "pix"
                       ? "bg-green-500/10 border-green-500/20"
-                      : price.type === "tc"
+                      : price.type === "tibia_coins"
                         ? "bg-blue-500/10 border-blue-500/20"
-                        : price.type === "gp"
+                        : price.type === "gold_coins"
                           ? "bg-yellow-500/10 border-yellow-500/20"
                           : "bg-purple-500/10 border-purple-500/20"
                   }`}
@@ -326,6 +354,11 @@ export function ListingDetailsModal({
                 </div>
               ))}
             </div>
+            {highestOfferLabel && (
+              <div className="rounded-lg border border-primary/30 bg-primary/5 px-3 py-2 text-sm font-medium text-primary">
+                {highestOfferLabel}
+              </div>
+            )}
           </div>
 
           {/* Informações de leilão */}

components/marketplace/MyAdsIntentionList.tsx

@@ -16,6 +16,9 @@ interface PurchaseIntention {
   buyer_message: string | null;
   seller_response: string | null;
   created_at: string;
+  custom_offer_amount: number | null;
+  custom_offer_currency: string | null;
+  custom_offer_created_at: string | null;
   buyer?: {
     user_id: number;
     username: string;
@@ -82,6 +85,28 @@ function getPaymentMethodLabel(method: string): string {
   }
 }
 
+function formatCustomOffer(intention: PurchaseIntention): string | null {
+  if (
+    intention.custom_offer_amount === null ||
+    intention.custom_offer_amount === undefined ||
+    !intention.custom_offer_currency
+  ) {
+    return null;
+  }
+
+  const amount = intention.custom_offer_amount;
+  switch (intention.custom_offer_currency) {
+    case "pix":
+      return `R$ ${amount.toFixed(2)}`;
+    case "tibia_coins":
+      return `${Math.round(amount).toLocaleString("pt-BR")} TC`;
+    case "gold_coins":
+      return `${Math.round(amount).toLocaleString("pt-BR")} GP`;
+    default:
+      return amount.toLocaleString("pt-BR");
+  }
+}
+
 export function MyAdsIntentionList({ listingId, sellerId }: MyAdsIntentionListProps) {
   const [intentions, setIntentions] = useState<PurchaseIntention[]>([]);
   const [loading, setLoading] = useState(true);
@@ -196,6 +221,18 @@ export function MyAdsIntentionList({ listingId, sellerId }: MyAdsIntentionListPr
                     <Clock className="h-3 w-3" />
                     <span>{formatTimeAgo(new Date(intention.created_at))}</span>
                   </div>
+                  {formatCustomOffer(intention) && (
+                    <div className="flex items-center gap-2 mb-1">
+                      <Badge variant="outline" className="border-primary text-primary">
+                        Oferta: {formatCustomOffer(intention)}
+                      </Badge>
+                      {intention.custom_offer_created_at && (
+                        <span className="text-[10px] text-muted-foreground">
+                          {new Date(intention.custom_offer_created_at).toLocaleString("pt-BR")}
+                        </span>
+                      )}
+                    </div>
+                  )}
                   {intention.buyer_message && (
                     <p className="text-xs text-muted-foreground line-clamp-1">
                       <MessageSquare className="h-3 w-3 inline mr-1" />

components/marketplace/MyPurchaseIntentionsPanel.tsx

@@ -133,6 +133,23 @@ function formatPrice(price: number | null, method: string): string {
   return price.toLocaleString("pt-BR");
 }
 
+function formatCustomOffer(amount: number | null | undefined, currency: string | null | undefined): string | null {
+  if (amount === null || amount === undefined || !currency) {
+    return null;
+  }
+
+  switch (currency) {
+    case "pix":
+      return `R$ ${amount.toFixed(2)}`;
+    case "tibia_coins":
+      return `${Math.round(amount).toLocaleString("pt-BR")} TC`;
+    case "gold_coins":
+      return `${Math.round(amount).toLocaleString("pt-BR")} GP`;
+    default:
+      return amount.toLocaleString("pt-BR");
+  }
+}
+
 interface IntentionCardProps {
   intention: PurchaseIntention;
   locale?: string;
@@ -213,6 +230,10 @@ function IntentionCard({ intention, locale = "pt" }: IntentionCardProps) {
     : listing.price_gold_coins && intention.payment_method === "gold_coins"
     ? listing.price_gold_coins
     : null;
+  const customOfferLabel = formatCustomOffer(
+    typeof intention.custom_offer_amount === "number" ? intention.custom_offer_amount : null,
+    intention.custom_offer_currency ?? null
+  );
 
   return (
     <>
@@ -256,6 +277,13 @@ function IntentionCard({ intention, locale = "pt" }: IntentionCardProps) {
                     </span>
                   )}
                 </div>
+                {customOfferLabel && (
+                  <div className="flex items-center gap-1 text-foreground">
+                    <Badge variant="outline" className="border-primary text-primary">
+                      Sua oferta: {customOfferLabel}
+                    </Badge>
+                  </div>
+                )}
               </div>
             </div>
           </div>
@@ -496,10 +524,7 @@ interface MyPurchaseIntentionsPanelProps {
 export function MyPurchaseIntentionsPanel({ locale = "pt" }: MyPurchaseIntentionsPanelProps) {
   const { user } = useSession();
   const [filter, setFilter] = useState<PurchaseIntentionStatus | "all">("all");
-  
-  const { intentions, isLoading, refetch } = useMyPurchaseIntentions(
-    filter === "all" ? undefined : filter
-  );
+  const { intentions, isLoading } = useMyPurchaseIntentions();
 
   // Contar por status
   const pendingCount = intentions.filter((i) => i.status === "pending").length;
@@ -507,6 +532,10 @@ export function MyPurchaseIntentionsPanel({ locale = "pt" }: MyPurchaseIntention
   const rejectedCount = intentions.filter((i) => i.status === "rejected").length;
   const expiredCount = intentions.filter((i) => i.status === "expired").length;
   const completedCount = intentions.filter((i) => i.status === "completed").length;
+  const filteredIntentions =
+    filter === "all"
+      ? intentions
+      : intentions.filter((intention) => intention.status === filter);
 
   if (!user) {
     return (
@@ -582,7 +611,7 @@ export function MyPurchaseIntentionsPanel({ locale = "pt" }: MyPurchaseIntention
             <Skeleton key={i} className="h-48 w-full" />
           ))}
         </div>
-      ) : intentions.length === 0 ? (
+      ) : filteredIntentions.length === 0 ? (
         <div className="text-center py-12 border rounded-lg">
           <ShoppingCart className="h-12 w-12 mx-auto mb-4 text-muted-foreground opacity-50" />
           <p className="text-lg font-medium mb-2">Nenhuma intenção de compra encontrada</p>
@@ -597,7 +626,7 @@ export function MyPurchaseIntentionsPanel({ locale = "pt" }: MyPurchaseIntention
         </div>
       ) : (
         <div className="space-y-4">
-          {intentions.map((intention) => (
+          {filteredIntentions.map((intention) => (
             <IntentionCard key={intention.intention_id} intention={intention} locale={locale} />
           ))}
         </div>

components/marketplace/PurchaseModal.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useState } from "react";
+import { useEffect, useState } from "react";
 import {
   Dialog,
   DialogContent,
@@ -14,6 +14,7 @@ import { Label } from "@/components/ui/label";
 import { Separator } from "@/components/ui/separator";
 import { DollarSign, Coins, RefreshCw, Loader2 } from "lucide-react";
 import { useSession } from "@/lib/hooks/use-session";
+import { Input } from "@/components/ui/input";
 
 interface Listing {
   listing_id: number;
@@ -25,6 +26,8 @@ interface Listing {
   trade_item_id?: number | null;
   trade_item_name?: string | null;
   trade_item_quantity?: number | null;
+  highest_custom_offer_amount?: number | string | null;
+  highest_custom_offer_currency?: string | null;
 }
 
 interface PurchaseModalProps {
@@ -39,6 +42,21 @@ export function PurchaseModal({ open, onOpenChange, listing, onSuccess }: Purcha
   const [selectedMethod, setSelectedMethod] = useState<string | null>(null);
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
+  const [customOfferValue, setCustomOfferValue] = useState<string>("");
+
+  useEffect(() => {
+    if (!open) {
+      setSelectedMethod(null);
+      setCustomOfferValue("");
+      setError(null);
+    }
+  }, [open]);
+
+  useEffect(() => {
+    if (selectedMethod && !["pix", "tibia_coins", "gold_coins"].includes(selectedMethod)) {
+      setCustomOfferValue("");
+    }
+  }, [selectedMethod]);
 
   if (!listing) return null;
 
@@ -65,7 +83,7 @@ export function PurchaseModal({ open, onOpenChange, listing, onSuccess }: Purcha
       : listing.price_tibia_coins;
     if (!isNaN(price)) {
       availableMethods.push({
-        type: "tc",
+        type: "tibia_coins",
         label: "Tibia Coins",
         value: `${price.toLocaleString()} TC`,
         icon: Coins,
@@ -79,7 +97,7 @@ export function PurchaseModal({ open, onOpenChange, listing, onSuccess }: Purcha
       : listing.price_gold_coins;
     if (!isNaN(price)) {
       availableMethods.push({
-        type: "gp",
+        type: "gold_coins",
         label: "Gold Coins",
         value: `${price.toLocaleString()} GP`,
         icon: Coins,
@@ -96,6 +114,31 @@ export function PurchaseModal({ open, onOpenChange, listing, onSuccess }: Purcha
     });
   }
 
+  const formatOffer = (amount: number | string | null, currency: string | null) => {
+    if (amount === null || amount === undefined || !currency) {
+      return null;
+    }
+    const numeric = typeof amount === "string" ? Number(amount) : amount;
+    if (Number.isNaN(numeric)) {
+      return null;
+    }
+    switch (currency) {
+      case "pix":
+        return `R$ ${numeric.toFixed(2)}`;
+      case "tibia_coins":
+        return `${Math.round(numeric).toLocaleString()} TC`;
+      case "gold_coins":
+        return `${Math.round(numeric).toLocaleString()} GP`;
+      default:
+        return `${numeric}`;
+    }
+  };
+
+  const highestOfferLabel = formatOffer(
+    listing.highest_custom_offer_amount ?? null,
+    listing.highest_custom_offer_currency ?? null
+  );
+
   // Se houver apenas um método, selecionar automaticamente
   if (availableMethods.length === 1 && !selectedMethod) {
     setSelectedMethod(availableMethods[0].type);
@@ -107,18 +150,36 @@ export function PurchaseModal({ open, onOpenChange, listing, onSuccess }: Purcha
       return;
     }
 
+    const hasCustomOffer = customOfferValue.trim().length > 0;
+    if (hasCustomOffer) {
+      const offerNumber = Number(customOfferValue);
+      if (Number.isNaN(offerNumber) || offerNumber <= 0) {
+        setError("Informe um valor válido para a oferta personalizada.");
+        return;
+      }
+    }
+
     setLoading(true);
     setError(null);
 
     try {
+      const payload: Record<string, unknown> = {
+        payment_method: selectedMethod,
+      };
+
+      if (hasCustomOffer && ["pix", "tibia_coins", "gold_coins"].includes(selectedMethod)) {
+        const offerNumber = Number(customOfferValue);
+        payload.custom_offer_amount =
+          selectedMethod === "pix" ? Number(offerNumber.toFixed(2)) : Math.floor(offerNumber);
+        payload.custom_offer_currency = selectedMethod;
+      }
+
       const response = await fetch(`/api/listings/${listing.listing_id}/purchase`, {
         method: "POST",
         headers: {
           "Content-Type": "application/json",
         },
-        body: JSON.stringify({
-          payment_method: selectedMethod,
-        }),
+        body: JSON.stringify(payload),
       });
 
       const data = await response.json();
@@ -132,6 +193,7 @@ export function PurchaseModal({ open, onOpenChange, listing, onSuccess }: Purcha
         onSuccess();
       }
       onOpenChange(false);
+      setCustomOfferValue("");
     } catch (err) {
       setError(err instanceof Error ? err.message : "Erro ao processar compra");
     } finally {
@@ -143,9 +205,9 @@ export function PurchaseModal({ open, onOpenChange, listing, onSuccess }: Purcha
     switch (type) {
       case "pix":
         return "bg-green-500 hover:bg-green-600 text-white";
-      case "tc":
+      case "tibia_coins":
         return "bg-blue-500 hover:bg-blue-600 text-white";
-      case "gp":
+      case "gold_coins":
         return "bg-yellow-500 hover:bg-yellow-600 text-white";
       case "trade":
         return "bg-purple-500 hover:bg-purple-600 text-white";
@@ -173,6 +235,24 @@ export function PurchaseModal({ open, onOpenChange, listing, onSuccess }: Purcha
             </p>
           </div>
 
+          <div className="space-y-2">
+            <p className="text-sm font-medium">Valores anunciados pelo vendedor</p>
+            <div className="flex flex-wrap gap-2">
+              {availableMethods.map((method) => (
+                <Badge key={`original-${method.type}`} variant="secondary" className="gap-1">
+                  {method.label}: {method.value}
+                </Badge>
+              ))}
+            </div>
+          </div>
+
+          {highestOfferLabel && (
+            <div className="rounded-lg border border-primary/30 bg-primary/5 px-3 py-2 text-sm">
+              Maior oferta registrada:{" "}
+              <span className="font-semibold">{highestOfferLabel}</span>
+            </div>
+          )}
+
           <Separator />
 
           {/* Seleção de método de pagamento */}
@@ -224,6 +304,27 @@ export function PurchaseModal({ open, onOpenChange, listing, onSuccess }: Purcha
             </p>
           )}
 
+          {selectedMethod &&
+            ["pix", "tibia_coins", "gold_coins"].includes(selectedMethod) && (
+              <div className="space-y-2">
+                <Label className="text-sm font-medium">
+                  Propor valor personalizado ({selectedMethod === "pix" ? "R$" : "quantidade"})
+                </Label>
+                <Input
+                  type="number"
+                  min="0"
+                  step={selectedMethod === "pix" ? "0.01" : "1"}
+                  value={customOfferValue}
+                  onChange={(event) => setCustomOfferValue(event.target.value)}
+                  placeholder={selectedMethod === "pix" ? "Ex.: 199.90" : "Ex.: 1200"}
+                />
+                <p className="text-xs text-muted-foreground">
+                  Esse valor será enviado ao vendedor como sua proposta. Ele pode aceitar, negar ou
+                  responder.
+                </p>
+              </div>
+            )}
+
           {error && (
             <div className="bg-destructive/10 text-destructive p-3 rounded-lg text-sm">
               {error}