update login resolver

 import { prisma } from "../../../utils";
+import bcrypt from "bcryptjs";
+import jwt from "jsonwebtoken";
 
 export default {
   Mutation: {
-    login: async (_, args) => {
+    login: async (_, args, context) => {
       const { email, password } = args;
+      const user = await prisma.user.findOne({
+        where: {
+          email,
+        },
+      });
+      if (!user) {
+        throw new Error("There is no such user");
+      }
+
+      const vaild = await bcrypt.compare(password, user.password);
+      if (!vaild) {
+        throw new Error("Invaild Password!");
+      }
+
+      const token = jwt.sign({ id: user.id }, process.env.JWT_SECRET);
+
+      return { token, user };
     },
   },
 };