feat: complete day 6

day5/routes/importExport.js

@@ -0,0 +1,140 @@
+const express = require("express");
+const router = express.Router();
+
+const { Validator } = require("node-input-validator");
+const multer = require("multer");
+const fs = require("fs");
+const path = require("path");
+const { parse: csvParse } = require("csv-parse");
+const XLSX = require("xlsx");
+const { stringify } = require("csv-stringify");
+
+const upload = multer({
+  dest: "uploads/",
+  limits: { fileSize: 5 * 1024 * 1024 }, // 5MB max size
+});
+
+const db = require("../models");
+const transaction = db.transaction; // or db.Transaction
+
+// Validation schema
+const transactionValidationRules = {
+  order_id: "required|integer",
+  user_id: "required|integer",
+  shipping_dock_id: "required|integer",
+  amount: "required|numeric",
+  discount: "required|numeric",
+  tax: "required|numeric",
+  total: "required|numeric",
+  notes: "string",
+  status: "required|integer",
+};
+
+const transactionValidationMessages = {
+  "order_id.required": "Order ID is required",
+  "user_id.required": "User ID is required",
+  // add more if needed
+};
+
+// Import endpoint
+router.post("/import", upload.single("file"), async (req, res) => {
+  if (!req.file) {
+    return res.status(400).json({ success: false, error: "No file uploaded" });
+  }
+
+  const ext = path.extname(req.file.originalname).toLowerCase();
+  let records = [];
+
+  try {
+    if (ext === ".csv") {
+      const fileContent = fs.readFileSync(req.file.path, "utf8");
+      records = await new Promise((resolve, reject) => {
+        csvParse(fileContent, { columns: true, trim: true }, (err, output) => {
+          if (err) reject(err);
+          else resolve(output);
+        });
+      });
+    } else if (ext === ".xlsx" || ext === ".xls") {
+      const workbook = XLSX.readFile(req.file.path);
+      const sheetName = workbook.SheetNames[0];
+      records = XLSX.utils.sheet_to_json(workbook.Sheets[sheetName]);
+    } else {
+      fs.unlinkSync(req.file.path);
+      return res
+        .status(400)
+        .json({ success: false, error: "Unsupported file type" });
+    }
+
+    const errors = [];
+    const inserted = [];
+
+    // Optional: Collect valid rows for bulk insert
+    const validRows = [];
+
+    for (const [i, row] of records.entries()) {
+      const v = new Validator(
+        row,
+        transactionValidationRules,
+        transactionValidationMessages
+      );
+      const isValid = await v.check();
+
+      if (!isValid) {
+        errors.push({ row: i + 1, errors: v.errors });
+        continue;
+      }
+
+      try {
+        validRows.push(row);
+      } catch (dbErr) {
+        errors.push({ row: i + 1, errors: dbErr.message });
+      }
+    }
+
+    if (validRows.length) {
+      const created = await transaction.bulkCreate(validRows);
+      inserted.push(...created);
+    }
+
+    fs.unlinkSync(req.file.path); // clean up
+
+    if (errors.length) {
+      return res
+        .status(400)
+        .json({ success: false, errors, insertedCount: inserted.length });
+    }
+
+    return res.status(200).json({ success: true, inserted });
+  } catch (err) {
+    if (req.file && fs.existsSync(req.file.path)) fs.unlinkSync(req.file.path);
+    return res.status(500).json({ success: false, error: err.message });
+  }
+});
+
+// Export endpoint
+router.get("/export", async (req, res) => {
+  try {
+    const transactions = await transaction.findAll({ raw: true });
+    if (!transactions.length) {
+      return res
+        .status(404)
+        .json({ success: false, error: "No transactions found" });
+    }
+
+    stringify(transactions, { header: true }, (err, output) => {
+      if (err) {
+        return res.status(500).json({ success: false, error: err.message });
+      }
+      res.setHeader("Content-Type", "text/csv");
+      res.setHeader(
+        "Content-Disposition",
+        'attachment; filename="transactions.csv"'
+      );
+      res.status(200).send(output);
+    });
+  } catch (err) {
+    res.status(500).json({ success: false, error: err.message });
+  }
+});
+
+module.exports = router;

day5/routes/index.js

@@ -1,9 +1,13 @@
-var express = require('express');
+var express = require("express");
 var router = express.Router();
 
 /* GET home page. */
-router.get('/', function(req, res, next) {
-  res.render('index', { title: 'Express' });
+router.get("/", function (req, res, next) {
+  res.render("index", { title: "Express" });
+});
+
+router.get("/import", function (_, res) {
+  res.render("import");
 });
 
 module.exports = router;