public static IEnumerable <EmployeeBonus> Generate(IEnumerable <Employee> employees,
IEnumerable <Contract> contracts,
DateTime startDate,
DateTime finalDate)
{
if (startDate > finalDate)
{
throw new ArgumentException($"'{nameof(finalDate)}' ({finalDate:dd.MM.yyyy}) cannot be less than " +
$"'{nameof(startDate)}' ({startDate:dd.MM.yyyy}).");
}
employees = FilterEmployeesByDate(employees, startDate, finalDate);
contracts = FilterContractsByDate(contracts, startDate, finalDate);
var calculators = new BonusCalculators(contracts, startDate, finalDate);
return(CalculateEmployeeBonuses(employees, calculators));
}
private static IEnumerable <EmployeeBonus> CalculateEmployeeBonuses(IEnumerable <Employee> employees,
BonusCalculators calculators) =>
from employee in employees
let bonus = employee.BonusCodes
.Sum(bonusCode => calculators.BonusCalculatorByBonusCode[bonusCode - 1](employee))
select new EmployeeBonus(employee.Id, bonus);