go_workshop/chapter_06/exercise_6.05/main.go

package main

import (
  "errors"
  "fmt"
)

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

func main() {

  pay := payDay(100, 25)
  fmt.Println(pay)
  pay = payDay(100, 200)
  fmt.Println(pay)
  pay = payDay(60, 25)
  fmt.Println(pay)

}

func payDay(hoursWorked, hourlyRate int) int {

  defer func() {
    if r := recover(); r != nil {
      if r == ErrHourlyRate {
        fmt.Printf("hourly rate: %d -> err: %v\n\n", hourlyRate, r)
      }
      if r == ErrHoursWorked {
        fmt.Printf("hours worked: %d -> err: %v\n\n", hoursWorked, r)
      }
    }
    fmt.Printf("Pay was calculated based on:\nhours worked: %d\nhourly rate: %d\n",
      hoursWorked, hourlyRate)
  }()

  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

}