Apurva Shukla Module4

Employee Management/EmployeeSearchAndSort.js

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+// Import required modules
+const filesystem = require('fs'); 
+const readline = require('readline'); 
+const fileName = 'employees.txt';
+
+// set to stored emails of registerd employees
+const allEmails= new Set();
+
+
+// Define the Employee class
+class Employee {
+  constructor(name, email, age, dob) {
+
+    // Set the instance variables
+    this.name = name;
+    this.email = email;
+    this.age = age;
+    this.dob = dob;
+  }
+}
+
+// Create a readline interface to read user input
+const inputOutputReader = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout
+});
+
+
+// Add an employee to the file
+function addEmployee(employee) {
+
+
+  // Validate the input parameters
+  const { name, email, age, dob } = employee;
+
+    if (!/^[a-zA-Z ]+$/.test(name)) {
+      console.log('Name should only contain letters.');
+      return;
+    }
+    if (!/\S+@\S+\.\S+/.test(email)) {
+      console.log('Email is not valid.');
+      return;
+    }
+
+    // Check if email already exists
+    if (allEmails.has(email)) {
+      console.log('Email already exists.');
+      return;
+    }
+
+    // Add email to the array
+
+    allEmails.add(email);
+
+    if (!Number.isInteger(age) ||age < 18 || age > 65) {
+      console.log('Age should be and between 18 and 65.');
+      return;
+    }
+    if (!isValidDOB(dob)) {
+      console.log('Invalid date of birth.');
+      return;
+    }
+
+  const employeeData = `${employee.name},${employee.email},${employee.age},${employee.dob}`;
+
+  filesystem.appendFileSync(fileName, `\n${employeeData}`, (err) => {
+    if (err) throw err;
+    console.log(`\n${employee.name} added successfully.`);
+  });
+}
+
+// Delete an employee with the given email address
+function deleteEmployee(email) {
+  if (!/\S+@\S+\.\S+/.test(email)) {
+    console.log('Email is not valid.');
+    return;
+  }
+  const employees = loadEmployeesFromFile(fileName);
+  const index = employees.findIndex((employee) => employee.email === email);
+  if (index !== -1) {
+    employees.splice(index, 1);
+    writeEmployeesToFile(employees);
+    console.log('Employee deleted successfully.');
+  } else {
+    console.log('Employee not found.');
+  }
+}
+
+
+// Search for employees with the given query string
+function searchEmployees(query, orderBy, direction) {
+
+  // Validate the orderBy and direction parameters
+  let validOrderBy = ['name', 'email', 'age', 'dob'];
+  if (!validOrderBy.includes(orderBy)) {
+    throw new Error('Invalid orderBy.');
+  }
+
+  let validDirection = ['asc', 'desc'];
+  if (!validDirection.includes(direction)) {
+    throw new Error('Invalid direction.');
+  }
+
+  const employees= loadEmployeesFromFile();
+  let results = employees.filter((employee) =>
+    JSON.stringify(employee).toLowerCase().includes(query.toLowerCase())
+  );
+  if (orderBy) {
+    results = results.sort((firstEmployee, secondEmployee) => {
+      const firstPropertyValue = firstEmployee[orderBy];
+      const secondPropertyValue = secondEmployee[orderBy];
+      if (typeof firstPropertyValue === 'string') {
+        return direction === 'asc'
+          ? firstPropertyValue.localeCompare(secondPropertyValue)
+          : secondPropertyValue.localeCompare(firstPropertyValue);
+      } else {
+        return direction === 'asc' ? firstPropertyValue - secondPropertyValue : secondPropertyValue - firstPropertyValue;
+      }
+    });
+  }
+  return results;
+}
+
+// funtion to load employees from the file
+function loadEmployeesFromFile(){
+  let employees = [];
+
+  try{
+  const data = filesystem.readFileSync(fileName, 'utf8');
+  employees = data.split('\n').map((line) => {
+    const [name, email, age, dob] = line.split(',');
+    return new Employee(name, email, parseInt(age), dob);
+  });
+
+  return employees;}
+  catch(err){
+    if (err.code === 'ENOENT') {
+      console.log('File not found.');
+      return [];
+    }
+    else{
+    console.log("Error in reading file", err);
+    return [];}
+  }
+}
+
+
+// function to load emails into the set
+function loadEmailsFromFile(){
+  let employees = [];
+
+  try{
+  const data = filesystem.readFileSync(fileName, 'utf8');
+  employees = data.split('\n').map((line) => {
+    const [name, email, age, dob] = line.split(',');
+    return new Employee(name, email, parseInt(age), dob);
+  });
+
+  // load emails into the set
+  employees.forEach((employee) => allEmails.add(employee.email));
+}
+  catch(err){
+    if (err.code === 'ENOENT') {
+      console.log('Error getting employees emails from file.');
+      return [];
+    }
+    else{
+    console.log("Error in reading file", err);
+    return [];}
+  }
+}
+
+
+
+// function to write employees to the file
+function writeEmployeesToFile(employees) {
+  try{
+  const data = employees
+    .map((employee) => {
+      const { name, email, age, dob } = employee;
+
+      return `${name},${email},${age},${dob}`;
+    })
+    .join('\n');
+  filesystem.writeFileSync(fileName, data);}
+  catch(err){
+
+    console.log("Error in writing file", err);
+  }
+}
+
+// Validate the date of birth
+function isValidDOB(dob){
+
+  if (!/^\d{4}-\d{2}-\d{2}$/.test(dob)) {
+  console.log('\nDate of birth should be in the format YYYY-MM-DD.');
+  return false;
+}
+
+const [year, month, day] = dob.split('-').map(Number);
+
+if (isNaN(year) || isNaN(month) || isNaN(day)) {
+  console.log('\nDate of birth should contain only numbers.');
+  return false;
+}
+
+if (month < 1 || month > 12) {
+  console.log('\nMonth should be between 1 and 12.');
+  return false;
+}
+
+if (day < 1 || day > 31) {
+  console.log('\nDay should be between 1 and 31.');
+  return false;
+}
+
+return true;
+
+}
+
+
+// Display all employees
+function displayEmployees() {
+
+  console.log('Employees:');
+  console.table(loadEmployeesFromFile());
+}
+
+
+// Define the main program
+function menu(){
+
+// loading emails into the  all emails set
+loadEmailsFromFile();
+
+inputOutputReader.setPrompt('Menu:\n1. Add employee\n2. Delete employee\n3. Search employees\n4. Display \n5.Exit\nEnter your choice:');
+inputOutputReader.prompt();
+
+inputOutputReader.on('line', (choice) => {
+  switch (choice.trim()) {
+    case '1':
+      inputOutputReader.question('Enter name:', (name) => {
+        inputOutputReader.question('Enter email:', (email) => {
+          inputOutputReader.question('Enter age:', (age) => {
+            age = parseInt(age);
+            inputOutputReader.question('Enter date of birth (YYYY-MM-DD):', (dobStr) => {
+              const employee = new Employee(name, email, age, dobStr);
+              addEmployee(employee);
+              inputOutputReader.prompt();
+            });
+          });
+        });
+      });
+      break;
+
+      case '2':
+        inputOutputReader.question('Enter employee email to delete:', (emailToDelete) => {
+          deleteEmployee(emailToDelete);
+          inputOutputReader.prompt();
+        });
+        break;
+
+    case '3':
+      inputOutputReader.question('Enter search query:', (query) => {
+        inputOutputReader.question('Enter sort order (name,age,email,dob):', (orderBy) => {
+          inputOutputReader.question('Enter sort direction (asc/desc):', (direction) => {
+            const results = searchEmployees(query, orderBy, direction);
+            console.log('Search results:');
+            console.table(results);
+            inputOutputReader.prompt();
+          });
+        });
+      });
+      break;
+
+    case '4':
+      displayEmployees();
+      inputOutputReader.prompt();
+      break;
+
+    case '5':
+      console.log('Exiting program.');
+      inputOutputReader.close();
+      process.exit(0);
+
+    default:
+      console.log('Invalid choice.');
+      inputOutputReader.prompt();
+      break;
+  }
+});
+
+
+}
+
+
+// Start the program
+menu();

Employee Management/employees.txt

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+Rohit Sharma,rohitritika@gmail.com,36,1989-10-14
+Virat Kohli,viratbhai@gmail.com,35,1989-12-29
+Suryakumar Yadav,suryatatasky@gmail.com,37,1985-12-15
+Suryakumar Zadav,suryatataskyz@gmail.com,36,1987-12-15
+Arshdeep Singh,arshupaaji@gmail.com,28,2000-09-08