//********************************************************
//
// Assignment 5 - Functions
//
// Name: <Kyle Merrihew>
//
// Class: C Programming, <Spring 2025>
//
// Date: <March 2,2025>
//
// Description: Program which determines overtime and 
// gross pay for a set of employees with outputs sent 
// to standard output (the screen).
//
// All functions are called by value
//
//********************************************************

#include <stdio.h>

// constants
#define SIZE 5
#define OVERTIME_RATE 1.5f
#define STD_WORK_WEEK 40.0f

// function prototypes
float getHours (long int clockNumber);
void printHeader (void);
void printEmp  (long int clockNumber, float wageRate, float hours,
                float overtimeHrs, float grossPay);
float calculateOvertime (float hours);
float calculateGrossPay (float wageRate, float hours, float overtimeHrs);

//**************************************************************
// Function: getHours 
// 
// Purpose: Obtains input from user, the number of hours worked 
// per employee and stores the result in a local variable 
// that is passed back to the calling function. 
// 
// Parameters: clockNumber - The unique employee ID
// 
// Returns: hoursWorked - hours worked in a given week
//  
//**************************************************************

float getHours (long int clockNumber) 
{ 
    float hoursWorked; // hours worked in a given week

    // Read in hours for employee
    printf("\nEnter hours worked by emp # %06li: ", clockNumber); 
    scanf ("%f", &hoursWorked); 

    // return hours back to the calling function
    return (hoursWorked);
 
} // getHours

//**************************************************************
// Function: printHeader
// 
// Purpose: Prints the initial table header information.
// 
// Parameters: none
// 
// Returns: void
//  
//**************************************************************

void printHeader (void) 
{ 
    printf ("\n\n*** Pay Calculator ***\n");

    // print the table header
    printf("\nClock# Wage  Hours  OT      Gross\n");
    printf("------------------------------------------------\n");

} // printHeader

//************************************************************* 
// Function: printEmp 
// 
// Purpose: Prints out all the information for an employee
// in a nice and orderly table format.
// 
// Parameters: 
//
//     clockNumber - unique employee ID
//     wageRate - hourly wage rate
//     hours - Hours worked for the week
//     overtimeHrs - overtime hours worked in a week
//     grossPay - gross pay for the week
// 
// Returns: void
//  
//**************************************************************

void printEmp (long int clockNumber, float wageRate, float hours,
                float overtimeHrs, float grossPay)
{
    // print the employee's details
    printf("%06li %.2f %.2f %.2f %.2f\n", clockNumber, wageRate, hours, overtimeHrs, grossPay);
}

//************************************************************* 
// Function: calculateOvertime
// 
// Purpose: Calculates the overtime hours worked based on total 
// hours worked in a week, assuming 40 hours is the regular work week.
// 
// Parameters: 
//     hours - total hours worked in the week
// 
// Returns: overtimeHrs - the overtime hours worked
//  
//**************************************************************

float calculateOvertime (float hours) 
{
    if (hours > STD_WORK_WEEK) {
        return hours - STD_WORK_WEEK; // calculate overtime hours
    }
    return 0.0f; // no overtime if hours are less than or equal to 40
}

//************************************************************* 
// Function: calculateGrossPay
// 
// Purpose: Calculates the gross pay based on regular and overtime 
// hours worked, multiplying by the wage rate and applying overtime 
// rate for hours worked beyond the standard 40-hour week.
// 
// Parameters: 
//     wageRate - hourly wage rate
//     hours - total hours worked
//     overtimeHrs - overtime hours worked
// 
// Returns: grossPay - the total gross pay for the week
//  
//**************************************************************

float calculateGrossPay (float wageRate, float hours, float overtimeHrs)
{
    // regular pay for standard hours worked
    float regularPay = wageRate * (hours - overtimeHrs);

    // overtime pay for extra hours worked
    float overtimePay = overtimeHrs * wageRate * OVERTIME_RATE;

    // total gross pay is the sum of regular pay and overtime pay
    return regularPay + overtimePay;
}

int main()
{
    /* Variable Declarations */

    long  int clockNumber[SIZE] = {98401,526488,765349,34645,127615}; // ID
    float grossPay[SIZE];     // gross pay
    float hours[SIZE];        // hours worked in a given week
    int   i;                  // loop and array index
    float overtimeHrs[SIZE];  // overtime hours
    float wageRate[SIZE] = {10.60,9.75,10.50,12.25,8.35}; // hourly wage rate

    // process each employee
    for (i = 0; i < SIZE; ++i)
    {
        // Read in hours for employee
        hours[i] = getHours (clockNumber[i]); 

        // Function call to calculate overtime hours
        overtimeHrs[i] = calculateOvertime(hours[i]);

        // Function call to calculate gross pay
        grossPay[i] = calculateGrossPay(wageRate[i], hours[i], overtimeHrs[i]);
    }

    // print the header info
    printHeader();

    // print out each employee
    for (i = 0; i < SIZE; ++i)
    {
        // Print all the employees - call by value
        printEmp (clockNumber[i], wageRate[i], hours[i],
                  overtimeHrs[i], grossPay[i]);

    } // for

    return (0);

} // main