feat: complete day 6

day5/app.js

@@ -1,11 +1,12 @@
-var createError = require('http-errors');
+var createError = require("http-errors");
-var express = require('express');
+var express = require("express");
-var path = require('path');
+var path = require("path");
-var cookieParser = require('cookie-parser');
+var cookieParser = require("cookie-parser");
-var logger = require('morgan');
+var logger = require("morgan");
 
-var indexRouter = require('./routes/index');
+var indexRouter = require("./routes/index");
-var usersRouter = require('./routes/users');
+var usersRouter = require("./routes/users");
+const importExportRouter = require("./routes/importExport");
 
 const db = require("./models");
 var cors = require("cors");
@@ -13,17 +14,18 @@ var cors = require("cors");
 var app = express();
 app.set("db", db);
 // view engine setup
-app.set('views', path.join(__dirname, 'views'));
+app.set("views", path.join(__dirname, "views"));
-app.set('view engine', 'jade');
+app.set("view engine", "jade");
 app.use(cors());
-app.use(logger('dev'));
+app.use(logger("dev"));
 app.use(express.json());
 app.use(express.urlencoded({ extended: false }));
 app.use(cookieParser());
-app.use(express.static(path.join(__dirname, 'public')));
+app.use(express.static(path.join(__dirname, "public")));
 
-app.use('/', indexRouter);
+app.use("/", indexRouter);
-app.use('/users', usersRouter);
+app.use("/users", usersRouter);
+app.use("/api/v1", importExportRouter);
 
 // catch 404 and forward to error handler
 app.use(function (req, res, next) {
@@ -34,11 +36,11 @@ app.use(function (req, res, next) {
 app.use(function (err, req, res, next) {
   // set locals, only providing error in development
   res.locals.message = err.message;
-  res.locals.error = req.app.get('env') === 'development' ? err : {};
+  res.locals.error = req.app.get("env") === "development" ? err : {};
 
   // render the error page
   res.status(err.status || 500);
-  res.render('error');
+  res.render("error");
 });
 
 module.exports = app;

day5/bin/www

@@ -4,16 +4,16 @@
  * Module dependencies.
  */
 
-var app = require('../app');
+var app = require("../app");
-var debug = require('debug')('day-1:server');
+var debug = require("debug")("day-1:server");
-var http = require('http');
+var http = require("http");
 
 /**
  * Get port from environment and store in Express.
  */
 
-var port = normalizePort(process.env.PORT || '3000');
+var port = normalizePort(process.env.PORT || "3000");
-app.set('port', port);
+app.set("port", port);
 
 /**
  * Create HTTP server.
@@ -26,8 +26,8 @@ var server = http.createServer(app);
  */
 
 server.listen(port);
-server.on('error', onError);
+server.on("error", onError);
-server.on('listening', onListening);
+server.on("listening", onListening);
 
 /**
  * Normalize a port into a number, string, or false.
@@ -54,22 +54,20 @@ function normalizePort(val) {
  */
 
 function onError(error) {
-  if (error.syscall !== 'listen') {
+  if (error.syscall !== "listen") {
     throw error;
   }
 
-  var bind = typeof port === 'string'
+  var bind = typeof port === "string" ? "Pipe " + port : "Port " + port;
-    ? 'Pipe ' + port
-    : 'Port ' + port;
 
   // handle specific listen errors with friendly messages
   switch (error.code) {
-    case 'EACCES':
+    case "EACCES":
-      console.error(bind + ' requires elevated privileges');
+      console.error(bind + " requires elevated privileges");
       process.exit(1);
       break;
-    case 'EADDRINUSE':
+    case "EADDRINUSE":
-      console.error(bind + ' is already in use');
+      console.error(bind + " is already in use");
       process.exit(1);
       break;
     default:
@@ -83,8 +81,7 @@ function onError(error) {
 
 function onListening() {
   var addr = server.address();
-  var bind = typeof addr === 'string'
+  var bind = typeof addr === "string" ? "pipe " + addr : "port " + addr.port;
-    ? 'pipe ' + addr
+  debug("Listening on " + bind);
-    : 'port ' + addr.port;
+  console.log("Server is listening on ", bind);
-  debug('Listening on ' + bind);
 }

day5/models/index.js

@@ -1,4 +1,4 @@
-'use strict';
+"use strict";
 /*Powered By: Manaknightdigital Inc. https://manaknightdigital.com/ Year: 2020*/
 /**
  * Sequelize File
@@ -8,24 +8,28 @@
  * @author Ryan Wong
  *
  */
-const fs = require('fs');
+const fs = require("fs");
-const path = require('path');
+const path = require("path");
-let Sequelize = require('sequelize');
+let Sequelize = require("sequelize");
 const basename = path.basename(__filename);
-const { DataTypes } = require('sequelize');
+const { DataTypes } = require("sequelize");
 const config = {
-  DB_DATABASE: 'mysql',
+  DB_DATABASE: "mysql",
-  DB_USERNAME: 'root',
+  DB_USERNAME: "root",
-  DB_PASSWORD: 'root',
+  DB_PASSWORD: process.env.DB_PASSWORD || "root",
-  DB_ADAPTER: 'mysql',
+  DB_ADAPTER: "mysql",
-  DB_NAME: 'day_1',
+  DB_NAME: "day_5",
-  DB_HOSTNAME: 'localhost',
+  DB_HOSTNAME: "localhost",
   DB_PORT: 3306,
 };
 
 let db = {};
 
-let sequelize = new Sequelize(config.DB_DATABASE, config.DB_USERNAME, config.DB_PASSWORD, {
+let sequelize = new Sequelize(
+  config.DB_NAME,
+  config.DB_USERNAME,
+  config.DB_PASSWORD,
+  {
     dialect: config.DB_ADAPTER,
     username: config.DB_USERNAME,
     password: config.DB_PASSWORD,
@@ -33,7 +37,7 @@ let sequelize = new Sequelize(config.DB_DATABASE, config.DB_USERNAME, config.DB_
     host: config.DB_HOSTNAME,
     port: config.DB_PORT,
     logging: console.log,
-  timezone: '-04:00',
+    timezone: "-04:00",
     pool: {
       maxConnections: 1,
       minConnections: 0,
@@ -44,13 +48,23 @@ let sequelize = new Sequelize(config.DB_DATABASE, config.DB_USERNAME, config.DB_
       underscoredAll: true,
       underscored: true,
     },
-});
+  }
+);
 
-// sequelize.sync({ force: true });
+sequelize
+  .sync()
+  .then(() => {
+    console.log("All tables synced successfully.");
+  })
+  .catch((err) => {
+    console.error("Failed to sync tables:", err);
+  });
 
 fs.readdirSync(__dirname)
   .filter((file) => {
-    return file.indexOf('.') !== 0 && file !== basename && file.slice(-3) === '.js';
+    return (
+      file.indexOf(".") !== 0 && file !== basename && file.slice(-3) === ".js"
+    );
   })
   .forEach((file) => {
     var model = require(path.join(__dirname, file))(sequelize, DataTypes);

day5/models/transaction.js

@@ -0,0 +1,41 @@
+module.exports = (sequelize, DataTypes) => {
+  const transaction = sequelize.define("transaction", {
+    id: {
+      type: DataTypes.INTEGER,
+      primaryKey: true,
+      autoIncrement: true,
+    },
+    order_id: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+    },
+    user_id: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+    },
+    shipping_dock_id: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+    },
+    amount: {
+      type: DataTypes.NUMERIC,
+      allowNull: false,
+    },
+    discount: {
+      type: DataTypes.NUMERIC,
+    },
+    tax: {
+      type: DataTypes.NUMERIC,
+    },
+    total: {
+      type: DataTypes.NUMERIC,
+      allowNull: false,
+    },
+    notes: DataTypes.STRING,
+    status: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+    },
+  });
+  return transaction;
+};

day5/package.json

@@ -3,17 +3,24 @@
   "version": "0.0.0",
   "private": true,
   "scripts": {
-    "start": "node ./bin/www"
+    "start": "node ./bin/www",
+    "dev": "node --watch --env-file=.env ./bin/www"
   },
   "dependencies": {
     "cookie-parser": "~1.4.4",
     "cors": "^2.8.5",
+    "csv-parse": "^6.0.0",
+    "csv-stringify": "^6.6.0",
     "debug": "~2.6.9",
     "express": "~4.16.1",
     "http-errors": "~1.6.3",
     "jade": "~1.11.0",
+    "joi": "^17.13.3",
     "morgan": "~1.9.1",
+    "multer": "^2.0.1",
     "mysql2": "^2.3.3",
-    "sequelize": "^6.15.1"
+    "node-input-validator": "^4.5.1",
+    "sequelize": "^6.15.1",
+    "xlsx": "^0.18.5"
   }
 }

day5/public/js/import.js

@@ -0,0 +1,50 @@
+document.addEventListener("DOMContentLoaded", function () {
+  const form = document.getElementById("importForm");
+  const resultDiv = document.getElementById("result");
+  const exportBtn = document.getElementById("exportBtn");
+
+  exportBtn.addEventListener("click", async function () {
+    try {
+      const response = await fetch("/api/v1/export", {
+        method: "GET",
+      });
+      if (!response.ok) {
+        const data = await response.json();
+        resultDiv.textContent = "Error: " + (data.error || "Unknown error");
+        return;
+      }
+      const blob = await response.blob();
+      const url = window.URL.createObjectURL(blob);
+      const a = document.createElement("a");
+      a.href = url;
+      a.download = "transactions.csv";
+      document.body.appendChild(a);
+      a.click();
+      a.remove();
+      window.URL.revokeObjectURL(url);
+      resultDiv.textContent = "Export successful!";
+    } catch (err) {
+      resultDiv.textContent = "Error: " + err.message;
+    }
+  });
+
+  form.addEventListener("submit", async function (e) {
+    e.preventDefault();
+    const formData = new FormData(form);
+
+    try {
+      const response = await fetch("/api/v1/import", {
+        method: "POST",
+        body: formData,
+      });
+      const data = await response.json();
+      if (data.success) {
+        resultDiv.textContent = "Import successful!";
+      } else {
+        resultDiv.textContent = "Error: " + (data.error || "Unknown error");
+      }
+    } catch (err) {
+      resultDiv.textContent = "Error: " + err.message;
+    }
+  });
+});

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) {
+router.get("/", function (req, res, next) {
-  res.render('index', { title: 'Express' });
+  res.render("index", { title: "Express" });
+});
+
+router.get("/import", function (_, res) {
+  res.render("import");
 });
 
 module.exports = router;

day5/views/import.jade

@@ -0,0 +1,12 @@
+extends layout
+
+block content
+  h1 Import Transactions
+  form#importForm(action="/api/v1/import" method="POST" enctype="multipart/form-data")
+    label(for="file") Choose CSV or Excel file:
+    input(type="file" name="file" id="file" accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel")
+    br
+    button#exportBtn(type="button") Export
+    button(type="submit") Import
+    div#result
+  script(src="/js/import.js")