From 81d71ef776a8af75fbf89fd86d29371115f828fc Mon Sep 17 00:00:00 2001
From: LONECODER1 <adityagupta1112004vns@gmail.com>
Date: Tue, 28 Oct 2025 11:32:43 +0530
Subject: [PATCH 1/3] added auction logic

---
 backend/src/controllers/auction.controller.ts |  0
 backend/src/models/auction.model.ts           | 56 +++++++++++++++++++
 backend/src/models/bid.model.ts               | 25 +++++++++
 backend/src/routes/auctionRoutes.ts           | 20 +++++++
 4 files changed, 101 insertions(+)
 create mode 100644 backend/src/controllers/auction.controller.ts
 create mode 100644 backend/src/models/auction.model.ts
 create mode 100644 backend/src/models/bid.model.ts
 create mode 100644 backend/src/routes/auctionRoutes.ts

diff --git a/backend/src/controllers/auction.controller.ts b/backend/src/controllers/auction.controller.ts
new file mode 100644
index 0000000..e69de29
diff --git a/backend/src/models/auction.model.ts b/backend/src/models/auction.model.ts
new file mode 100644
index 0000000..0d6e596
--- /dev/null
+++ b/backend/src/models/auction.model.ts
@@ -0,0 +1,56 @@
+import mongoose from "mongoose";
+
+const auctionSchema = new mongoose.Schema({
+  itemName: {
+    type: String,
+    required: true,
+    trim: true,
+  },
+  itemDescription: {
+    type: String,
+    trim: true,
+  },
+  startPrice: {
+    type: Number,
+    required: true,
+    min: 0,
+  },
+  currentHighestBid: {
+    type: Number,
+    default: 0,
+  },
+  highestBidder: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "User",
+    default: null,
+  },
+  seller: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "User",
+    required: true,
+  },
+  createdAt: {
+    type: Date,
+    default: Date.now,
+  },
+  expiresAt: {
+    type: Date,
+    required: true,
+  },
+  status: {
+    type: String,
+    enum: ["active", "expired", "sold"],
+    default: "active",
+  },
+  soldTo: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "User",
+    default: null,
+  },
+  soldPrice: {
+    type: Number,
+    default: 0,
+  },
+});
+
+export default mongoose.model("Auction", auctionSchema);
diff --git a/backend/src/models/bid.model.ts b/backend/src/models/bid.model.ts
new file mode 100644
index 0000000..1dfb400
--- /dev/null
+++ b/backend/src/models/bid.model.ts
@@ -0,0 +1,25 @@
+import mongoose from "mongoose";
+
+const bidSchema = new mongoose.Schema({
+  auctionId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "Auction",
+    required: true,
+  },
+  bidder: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "User",
+    required: true,
+  },
+  amount: {
+    type: Number,
+    required: true,
+    min: 0,
+  },
+  createdAt: {
+    type: Date,
+    default: Date.now,
+  },
+});
+
+export default mongoose.model("Bid", bidSchema);
diff --git a/backend/src/routes/auctionRoutes.ts b/backend/src/routes/auctionRoutes.ts
new file mode 100644
index 0000000..5f4f908
--- /dev/null
+++ b/backend/src/routes/auctionRoutes.ts
@@ -0,0 +1,20 @@
+import express from "express";
+import {
+  createAuction,
+  placeBid,
+  acceptHighestBid,
+} from "../controllers/auction.controller";
+import { authenticate, authorizeRole } from "../middleware/authMiddleware";
+
+const router = express.Router();
+
+//  Create a new auction (only sellers)
+router.post("/", authenticate, authorizeRole("seller"), createAuction);
+
+//  Place a bid (only buyers)
+router.post("/:id/bid", authenticate, authorizeRole("buyer"), placeBid);
+
+//  Seller accepts the highest bid (only sellers)
+router.post("/:id/accept", authenticate, authorizeRole("seller"), acceptHighestBid);
+
+export default router;

From a358fb3d9389547845bef5ff88fa4e91203bb481 Mon Sep 17 00:00:00 2001
From: Shubham Kumar <161634026+04shubham7@users.noreply.github.com>
Date: Wed, 29 Oct 2025 09:19:07 +0530
Subject: [PATCH 2/3] Update backend/src/models/auction.model.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---
 backend/src/models/auction.model.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backend/src/models/auction.model.ts b/backend/src/models/auction.model.ts
index 0d6e596..ce56b61 100644
--- a/backend/src/models/auction.model.ts
+++ b/backend/src/models/auction.model.ts
@@ -17,7 +17,7 @@ const auctionSchema = new mongoose.Schema({
   },
   currentHighestBid: {
     type: Number,
-    default: 0,
+    default: function () { return this.startPrice; },
   },
   highestBidder: {
     type: mongoose.Schema.Types.ObjectId,

From a52b2edfbcbc30119c56c5761f4fbf856bb3f071 Mon Sep 17 00:00:00 2001
From: Shubham Kumar <161634026+04shubham7@users.noreply.github.com>
Date: Wed, 29 Oct 2025 09:19:20 +0530
Subject: [PATCH 3/3] Update backend/src/models/bid.model.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---
 backend/src/models/bid.model.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backend/src/models/bid.model.ts b/backend/src/models/bid.model.ts
index 1dfb400..b4f3c5c 100644
--- a/backend/src/models/bid.model.ts
+++ b/backend/src/models/bid.model.ts
@@ -14,7 +14,7 @@ const bidSchema = new mongoose.Schema({
   amount: {
     type: Number,
     required: true,
-    min: 0,
+    min: 1,
   },
   createdAt: {
     type: Date,