const RESP_INVALID = -1
const ZERO = 0
const ONE_HUNDRED = 100

const SENIOR = "senior"
const BONUS_SENIOR = 0.20
const MID = "mid"
const BONUS_MID = 0.10

const UPPER_SALARY = 5000
const UPPER_SALARY_TAX = 0.25
const MID_SALARY = 2000
const MID_SALARY_TAX = 0.15
const BASE_SALARY_TAX = 0.08

function calcBonus(category: string, salary: number) {

  const mapBonus = {
    [SENIOR]: salary * BONUS_SENIOR,
    [MID]: salary * BONUS_MID
  }

  return mapBonus[category] ?? ZERO
}

function calcTax(salary: number) {
  if (salary > UPPER_SALARY) {
    return salary * UPPER_SALARY_TAX;
  }

  if (salary > MID_SALARY) {
    return salary * MID_SALARY_TAX;
  }

  return salary * BASE_SALARY_TAX;

}

export function calculateMonthlySalary(hours: number, rate: number, category: string): number {
  // Verificar si las horas trabajadas son válidas
  // Verificar si la tarifa por hora es válida
  if (hours <= ZERO || rate <= ZERO) return RESP_INVALID;

  // Calcular salario bruto multiplicando horas por tarifa
  const gross_salary = hours * rate;
  const bonus = calcBonus(category, gross_salary)

  // Sumar salario bruto más bonificación
  const total_salary = gross_salary + bonus;
  const tax = calcTax(total_salary)

  // Restar impuestos y redondear a dos decimales
  return Math.round((total_salary - tax) * ONE_HUNDRED) / ONE_HUNDRED;
}