Company.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Exam_Preparation1
{
    public class Company
    {
        private string name;
        private List<Employee> employees;

        public Company(string name)
        {
            Name = name;
            employees = new List<Employee>();
        }

        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                if (value.Length < 3)
                {
                    throw ArgumentException("Invalid name");
                }
                name = value;
            }
        }

        private Exception ArgumentException(string v)
        {
            throw new NotImplementedException();
        }

        public List<Employee> Employees
        {
            get
            {
                return employees;
            }
            set
            {
                employees = value;
            }
        }

        public override string ToString()
        {
            string result = "";
            if (employees.Count <= 0)
            {
                result += $"Company {name} has 0 employees and they are:\n";
                result += "N/A";
            }
            else
            {
                result += $"Company {name} has {employees.Count} employees and they are:\n";
                foreach(Employee employee in employees)
                {
                    result += employee.ToString() + "\n";
                }
            }

            return result;
        }

        public void Hire(Employee employee)
        {
            employees.Add(employee);
        }

        public bool Fire(Employee employee)
        {
            return employees.Remove(employee);
        }

        public double CalculateSalaries()
        {
            //return employees.Sum(employee => employee.Salary);
            double totalSalaries = 0;
            foreach(Employee employee in employees)
            {
                totalSalaries += employee.Salary;
            }

            return totalSalaries;
        }

        public Employee GetEmployeeWithHighestSalary()
        {
            return employees.OrderByDescending(emp => emp.Salary).First();
        }

        public bool CheckEmployeeIsHired(string name)
        {
            foreach(Employee employee in employees)
            {
                if (name == employee.Name)
                {
                    return true;
                }
            }

            return false;
        }

        public void RenameCompany(string newName)
        {
            Name = newName;
        }

        public void FireAllEmployees()
        {
            employees.Clear();
        }

    }
}