added seller statistic feature

src/controllers/statsController.ts

@@ -0,0 +1,21 @@
+import { Request, Response } from 'express';
+import { StatisticsService } from '../services/stats.service';
+// import { StatisticsService } from './statisticsService';
+
+export async function getYearlyStats(req:Request, res:Response) {
+  const sellerId  = (req as any).user.id;
+  const now = new Date();
+  const startOfYear = new Date(now.getFullYear(), now.getMonth() - 11, 1);
+
+  const stats = [];
+
+  for (let month = startOfYear; month <= now; month.setMonth(month.getMonth() + 1)) {
+    const startOfMonth = new Date(month.getFullYear(), month.getMonth(), 1);
+    const endOfMonth = new Date(month.getFullYear(), month.getMonth() + 1, 0);
+
+    const monthlyStats = await StatisticsService.calculateMonthlyStats(sellerId, startOfMonth, endOfMonth);
+    stats.push(monthlyStats);
+  }
+
+  res.json(stats);
+}

src/docs/stats.ts

@@ -0,0 +1,16 @@
+export const getSellerStats = {
+    tags: ["stats"],
+    security: [{ bearerAuth: [] }],
+    summary: "Get seller statistics",
+    responses: {
+        200: {
+            description: "success",
+        },
+        401: {
+            description: "Unauthorized",
+        },
+        500: {
+            description: "Internal Server Error",
+        },
+    },
+}

src/docs/swagger.ts

@@ -43,6 +43,7 @@ import { createReviewProduct, deleteReview, getReviewProduct, reviewSchema, upda
 import { getAdProducts } from "./products";
 import {PrivateChatSchema, getAllUserPrivateChats, getUserToUserPrivateMessages, createPrivateChat } from "./privateChatDoc"
 import { StatusSchema, buyerAndSellerOrder, statusUpdate } from "./orders";
+import { getSellerStats } from "./stats";
 
 const docRouter = express.Router();
 
@@ -80,7 +81,8 @@ const options = {
     { name: "Carts", description: "Endpoints related to Cart" },
     { name: "Payments", description: "Endpoints related to payments" },
     { name: "PrivateChat", description: "Endpoints related to Private Chat" },
-    {name: "orders", description: "Endpoints related to orders"}
+    {name: "orders", description: "Endpoints related to orders"},
+    {name: "stats", description: "Endpoints related to Seller statistics"}
   ],
 
   paths: {
@@ -205,6 +207,9 @@ const options = {
       },
       "/api/v1/orders/{id}/status": {
         patch: statusUpdate
+      },
+      "/api/v1/stats":{
+        get: getSellerStats
       }
   },
   components: {

src/routes/index.ts

@@ -9,6 +9,7 @@ import notificationRoutes from "./notificationRoutes";
 import paymentRouter from "./paymentRoutes";
 import PrivateChatRoutes from "./privateChatRoutes";
 import orderRouter from "./orderRoute";
+import statsRouter from "./statsRoutes";
 const appROutes = Router();
 
 appROutes.use("/chats", PrivateChatRoutes);
@@ -21,4 +22,5 @@ appROutes.use("/carts", cartRoutes);
 appROutes.use("/notifications", notificationRoutes);
 appROutes.use("/payment", paymentRouter);
 appROutes.use("/orders", orderRouter)
+appROutes.use("/stats", statsRouter);
 export default appROutes;

src/routes/statsRoutes.ts

@@ -0,0 +1,11 @@
+import express from "express";
+
+import { getYearlyStats } from "../controllers/statsController";
+import { isLoggedIn } from "../middlewares/isLoggedIn";
+import { isAseller } from "../middlewares/sellerAuth";
+
+const statsRouter = express.Router();
+
+statsRouter.get("/", isLoggedIn, isAseller , getYearlyStats);
+
+export default statsRouter;

src/services/stats.service.ts

@@ -0,0 +1,50 @@
+import { Op, Sequelize } from 'sequelize';
+import Product from '../sequelize/models/products';
+import  OrderItem  from '../sequelize/models/orderItems';
+
+interface OrderItemWithProduct extends OrderItem {
+    product: Product;
+  }
+
+export class StatisticsService {
+  static async calculateMonthlyStats(sellerId: string, startOfMonth: Date, endOfMonth: Date) {
+
+    const totalProducts = await Product.count({ where: { userId: sellerId } });
+
+    const itemsOrdered= (await OrderItem.findAll({ 
+      include: [{
+        model: Product,
+        as: 'product',
+        where: { userId: sellerId },
+        required: true
+      }],
+      where: { 
+        createdAt: { [Op.gte]: startOfMonth, [Op.lte]: endOfMonth } 
+      } 
+    })) as OrderItemWithProduct[];
+
+    const monthlySales = itemsOrdered.reduce((sum, item) => sum + item.quantity, 0);
+
+    const monthlyRevenue = itemsOrdered.reduce((sum, item) => sum + (item.product.price * item.quantity), 0);
+
+
+    const expiredProducts = await Product.findAll({ 
+        where: { 
+          userId: sellerId, 
+          expiryDate: { [Op.gte]: startOfMonth, [Op.lte]: endOfMonth } 
+        } 
+      });
+
+
+      const losses = expiredProducts.reduce((sum, product) => sum + product.price, 0);
+    const monthName = startOfMonth.toLocaleString('default', { month: 'long' });
+    return {
+      month: monthName,
+      totalProducts,
+      monthlySales,
+      monthlyRevenue,
+      expiredProducts,
+      losses,
+    };
+  }
+}