OPA14August.cs

//Author: Vishva Patel
using System;
using System.Collections.Generic;

namespace OPA14thAUG
{
    class OPA14August
    {
        static void Main(string[] args)
        {
            EmployeeManager manager = new EmployeeManager(); //creating the oject of Employee Manager Class
            manager.AddEmployee("Ravi", "1.4", "Masters");
            manager.AddEmployee("Ram", "2.3", "Degree");
            manager.AddEmployee("Rachel", "1.0", "Masters");

            //ORIGINAL PROGRAM BEGINS
            int choice = Convert.ToInt32(Console.ReadLine());
            switch (choice)
            {
                case 1:
                    //VIEW THE EMPLOYEES
                    List<Employee> emp = manager.ViewEmployees();
                    if(emp == null)
                    {
                        Console.WriteLine("No employees present");
                    }
                    else
                    {
                        foreach (var em in emp) 
                        {
                            string[] experinece = em.experience.Split('.'); //Splitting years and month
                            int year = Convert.ToInt16(experinece[0]); //Extract Years
                            int month = Convert.ToInt16(experinece[1]); //Extract Months
                            Console.WriteLine($"{em.empId}: {em.Name}, experience:{year}y{month}m, gross = {em.grossalary}, " +
                                $"net = {em.netsalary}");
                        }
                    }
                    break;

                //ADDING EMPLOYEES
                case 2:
                    string name = Console.ReadLine();
                    string exp = Console.ReadLine();
                    string quali = Console.ReadLine();
                    Employee e = null;
                    if(quali == "Degree" || quali == "Masters")
                    {
                        if (!exp.Contains('.'))
                        {
                            Console.WriteLine("Invalid format!");
                        }
                        if (e == null)
                        {
                            Console.WriteLine("Employee already exists");
                        }
                        else
                        {
                            Console.WriteLine($"Name: {e.Name} \n Id: {e.empId} \n Experience: {e.experience} \n Qualification: {e.qualification}" +
                                $"\n BasicPay: {e.basicsalary} \n Gross Pay: {e.grossalary} \n PF: {e.Pf} \n Tax: {e.tax} \n Net pay: {e.netsalary}");
                        }
                        
                    }
                    else
                    {
                        Console.WriteLine("Invalid Qualification");
                    }
                    break;
            }
        }
    }
    class Employee
    {
        public int empId { get; set; } //Employee Id
        public string  Name { get; set; } //Employee Name
        public string experience { get; set; } //Employee Experience
        public string qualification { get; set; } //Employee Qalification

        public double grossalary { get; set; } 
        public double basicsalary { get; set; }
        public double Pf { get; set; } //Employee providend fund
        public double  tax { get; set; }
        public double netsalary { get; set; } 

        //This constructor when called will create an entry adding into the list
        public Employee(int id, string nme, string exp, string quali, double gs, double bs,double pfund, double tx, double netsal)
        {
            empId = id;
            Name = nme;
            experience = exp;
            qualification = quali;
            grossalary = gs;
            Pf = pfund;
            tax = tx;
            basicsalary = bs;
            netsalary = netsal;
        }
    }


   class EmployeeManager
    {
        List<Employee> employees = new List<Employee>(); //Creating the list of employees
        public static int Id = 1001; //Getting the autogenerated ID

        //Calculating Gross Salary
        public double CalculateGross(string exp,string quali)
        {
            string[] experinece = exp.Split('.'); //Splitting years and month
            int year = Convert.ToInt16(experinece[0]); //Extract Years
            int month = Convert.ToInt16(experinece[1]); //Extract Months


            if (quali == "Degree" && year == 1)
            {
                return month == 0 ? 250000 : 300000; //Exactly One Year or less than 2 year

            }
            else if (quali == "Degree" && year > 1)
            {
                return month > 0 ? 250000 + 50000 * (year) : 250000 + 50000 * (year - 1); //Greater and equal to 2 years experience
            }
            else
            { 
                //qualification is masters
                if (year == 1)
                {
                    return month > 0? 315000: 300000; //equal to 1 year or more but less than 2 years
                }
                else
                {
                    return year > 1 && month > 0 ? 300000 + 15000 * (year) : 300000 + 15000 * (year - 1); //Greater and equal to 2 years experience
                }

            }
        } 
        public double CalculateTax(double gs)
        {
            if (gs < 300000) 
            {
                return 0; //Zero tax
            }
            else if(gs > 300000 && gs < 500001)
            {
                return 0.1 * gs; //10% tax
            }
            else if(gs > 500000 && gs < 800001)
            {
                return 0.2 * gs; //20% tax
            }
            else
            {
                return 0.3 * gs; //30% tax
            }
        }

        public List<Employee> ViewEmployees()
        {
            if (employees == null)
            {
                return null; //If list is empty
            }
            else
            {
                return employees; //return the list of employees
            }
        }

        public Employee AddEmployee(string empname, string experience,string quali)
        {
            EmployeeManager m = new EmployeeManager(); //Creating the employee manager
            double gs = m.CalculateGross(experience, quali); //Calculating gross salary
            double tax = m.CalculateTax(gs); //Calculating tax on gross salary
            double bs = 0.4 * gs; //Basic salary
            double pfund = 0.12 * bs; //Providend Fund salary
            double ns = gs - (pfund + tax); //Net salary 
            Employee e = new Employee(Id, empname, experience, quali, gs,bs , pfund, tax, ns); //Creating an employee object to add to list
            //Checking for existing employee
            if (employees.Contains(e))
            {
                Id--; //Deleting the Id alotted
                return null; //returning null
            }
            else
            {
                employees.Add(e); //Adding the employee
                Id++; //Incrementing the Id 
                return e; //returning the employee object
            }

        }

   }
}