second commit with payment method

index.js

@@ -2,7 +2,7 @@ const express = require("express");
 const mongoose = require("mongoose");
 const bodyParser = require("body-parser");
 const app = express();
-const filterRoutes = require("./routes/filter_routes");
+const Routes = require("./routes/routes");
 const cors = require("cors");
 
 mongoose.connect("mongodb://localhost/GoalTeller");
@@ -12,6 +12,6 @@ require("./model/loan");
 
 app.use(bodyParser());
 
-app.use("/api", filterRoutes);
+app.use("/api", Routes);
 
 app.listen("5000", () => console.log("Server listening on port 5000"));

model/loan.js

@@ -13,7 +13,17 @@ const PostSchema = mongoose.Schema(
     installments_tobe_paid: { type: "number" },
     amount_paid: { type: "number", default: 0 },
     amount_tobe_paid: { type: "number" },
-    transactions: { type: "string", default: null },
+    transactions: [
+      {
+        transaction_type: {
+          type: String,
+          enum: ["Credited", "Debited"],
+          default: null,
+        },
+        amount: { type: Number, default: null },
+        date: { type: Date, default: null },
+      },
+    ],
   },
   { timestamps: true }
 );

routes/routes.js

@@ -0,0 +1,130 @@
+const express = require("express");
+const loan = require("../model/loan");
+const mongoose = require("mongoose");
+const router = express.Router();
+
+//API to LEND the loan money to the customer
+router.post("/lend", async function (req, res) {
+  try {
+    const number = await loan.countDocuments();
+    let loan_num = "LNOID0" + req.body.customer_id + number;
+    const loan_interest =
+      req.body.loan_amount + req.body.interest * req.body.loan_period;
+    const Total_Amount = req.body.loan_amount + parseInt(loan_interest);
+    const monthly_amount = Total_Amount / (req.body.loan_period * 12);
+
+    const installments = req.body.loan_period * 12;
+
+    const { customer_id, loan_amount, interest, loan_period } = req.body;
+    const customer_loan = await loan.create({
+      customer_id,
+      loan_id: loan_num,
+      interest,
+      loan_amount,
+      loan_period,
+      total_amount: Total_Amount,
+      total_installments: installments,
+      installments_tobe_paid: installments,
+      amount_tobe_paid: Total_Amount,
+    });
+    return res.json({
+      status: "success",
+      data: {
+        Loan_ID: loan_num,
+        Total: Total_Amount,
+        Monthly_Amount: monthly_amount,
+      },
+    });
+  } catch (e) {
+    res.json({
+      status: "failed",
+      message: e.message,
+    });
+  }
+});
+
+//API for the payment method
+router.put("/payment", async function (req, res) {
+  try {
+    const { customer_id, loan_id, Amount } = req.body;
+    const loan_details = await loan
+      .find({ customer_id: customer_id }, { loan_id: loan_id })
+      .select(
+        "total_amount installments_paid amount_paid total_installments -_id"
+      );
+
+    let TotalAmount = 0;
+    let InstallmentsPaid = 0;
+    let AmountPaid = 0;
+    let TotalInstallments = 0;
+    loan_details.forEach((detail) => {
+      TotalAmount = detail.total_amount;
+      InstallmentsPaid = detail.installments_paid;
+      AmountPaid = detail.amount_paid;
+      TotalInstallments = detail.total_installments;
+    });
+
+    //Amount and Installments calculations
+    let new_amount = 0;
+    let new_installments = parseInt(InstallmentsPaid) + 1;
+    if (parseInt(AmountPaid) == 0) {
+      new_amount = TotalAmount - Amount;
+    } else {
+      new_amount = TotalAmount - (Amount + parseInt(AmountPaid));
+    }
+
+    //Update the transactions
+    let new_installments_tobe_paid =
+      parseInt(TotalInstallments) - parseInt(new_installments);
+    console.log(
+      new_amount,
+      Amount + parseInt(AmountPaid),
+      new_installments,
+      new_installments_tobe_paid
+    );
+    const payment = await loan.findOneAndUpdate(
+      { loan_id: loan_id },
+      {
+        $set: {
+          amount_tobe_paid: new_amount,
+          amount_paid: Amount + parseInt(AmountPaid),
+          installments_paid: new_installments,
+          installments_tobe_paid: new_installments_tobe_paid,
+        },
+      },
+      { new: true }
+    );
+    console.log(payment);
+    return res.json({
+      status: "success",
+      data: {
+        payment,
+      },
+    });
+  } catch (e) {
+    res.json({
+      status: "failed",
+      message: e.message,
+    });
+  }
+});
+
+// router.delete("/delete/filter", async function (req, res) {
+//   try {
+//     const { condition, projection } = req.body;
+//     const students = await Student.deleteMany(condition, projection);
+//     return res.json({
+//       status: "success",
+//       data: {
+//         students,
+//       },
+//     });
+//   } catch (e) {
+//     res.json({
+//       status: "failed",
+//       message: e.message,
+//     });
+//   }
+// });
+
+module.exports = router;