package main

import (
  "errors"
  "fmt"
)

var (
  ErrHourlyRate  = errors.New("invalid hourly rate")
  ErrHoursWorked = errors.New("invalid hours worked per week")
)

func main() {

  pay := payDay(81, 50)
  fmt.Println(pay)

}

func payDay(hoursWorked, hourlyRate int) int {

  report := func() {
    fmt.Printf("hoursWorked: %d\nhourlyRate: %d\n", hoursWorked, hourlyRate)
  }
  defer report()

  if hourlyRate < 10 || hourlyRate > 75 {
    panic(ErrHourlyRate)
  }
  if hoursWorked < 0 || hoursWorked > 80 {
    panic(ErrHoursWorked)
  }

  if hoursWorked > 40 {
    hoursOver := hoursWorked - 40
    overTime := hoursOver * 2
    regularPay := 40 * hourlyRate
    return regularPay + overTime
  }

  return hoursWorked * hourlyRate

}