//********************************************************
//
// Assignment 5 - Functions
//
// Name: Larson Klipic
//
// Class: C Programming, SUMMER 26
//
// Date: JULY 5th
//
// Description: Program which determines overtime and 
// gross pay for a set of employees with outputs sent 
// to standard output (the screen).
//
// Call by Value design
//
//********************************************************


// Define and Includes

#include <stdio.h>

// Define Constants
#define SIZE 5
#define STD_HOURS 40.0
#define OT_RATE 1.5

// structure for employee data
struct employee
{
    long int clockNumber;
    float wageRate;
    float hours;
    float overtimeHrs;
    float grossPay;
};

// prototypes 
float getHours (long int clockNumber);
void printHeader (void);
void printEmp (long int clockNumber, float wageRate, float hours,
               float overtimeHrs, float grossPay);
float OTwork (float hours);
float pay (float wageRate, float hours, float overtimeHrs);

int main ()
{
    // Set up a local variable to store the employee information
    struct employee employeeData[SIZE] = {
        { 98401, 10.60 },
        { 526488, 9.75 },
        { 765349, 10.50 }, // initialize clock and wage values
        { 34645, 12.25 },
        { 127615, 8.35 }
    };

    int i;  // loop and array index

    // Call functions as needed to read and calculate information
    for (i = 0; i < SIZE; ++i) 
    { 

       // Prompt for the number of hours worked by the employee
       employeeData[i].hours = getHours (employeeData[i].clockNumber); 
       
       // calculate overtime hopurs for a employee
       employeeData[i].overtimeHrs = OTwork(employeeData[i].hours);
       
       // calculate gross pay for a employee
       employeeData[i].grossPay = pay(employeeData[i].wageRate, 
                                      employeeData[i].hours,
                                      employeeData[i].overtimeHrs);
            
    } // for

    // Print the column headers
    printHeader();

    // print out each employee
    for (i = 0; i < SIZE; ++i) 
    { 
        printEmp (employeeData[i].clockNumber, 
                  employeeData[i].wageRate, 
                  employeeData[i].hours,
                  employeeData[i].overtimeHrs, 
                  employeeData[i].grossPay);
    }

    return(0); // success

} // main

//**************************************************************
// 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 out a single employee
    printf("\n %06li %5.2f %4.1f %4.1f %8.2f",
          clockNumber, wageRate, hours,
          overtimeHrs, grossPay);

}  // printEmp


//**************************************************************
// Function: OTwork 
// 
// Purpose: calculate the overtime for an employee.
// 
// Parameters: hours - an array of time the employee worked
// 
// Returns: hrsWork - overtime hours
//  
//**************************************************************
 
float OTwork (float hours)
{
	float hrsWork; // hours worked
 
	// overtime
	if (hours > STD_HOURS )
	{
		hrsWork = hours - STD_HOURS;
	}
	else // no OT
	{
		hrsWork = 0.0;
	}
 
	return(hrsWork);
} // OTwork


//**************************************************************
// Function: pay 
// 
// Purpose: calculate grosspay for an employee.
// 
// Parameters: wageRate - hourly wage of a employee
//			   hours - time worked from a employee
//			   overtimeHrs - overtime hours of a empoyee
// 
// Returns: gross - calculated grosspay of the employee
//  
//**************************************************************
 
float pay (float wageRate, float hours, float overtimeHrs)
{
    float gross;       // gross pay
    float normalPay;   // pay without overtime
    float overtimePay; // only overtime pay
 
    // calculate gross with normal pay and overtime pay
    if (overtimeHrs > 0)
    {
        // overtime 
        normalPay = wageRate * STD_HOURS;
        overtimePay = overtimeHrs * (wageRate * OT_RATE);
        gross = normalPay + overtimePay;
    }
    else
    {
        // No overtime
        gross = hours * wageRate;
    }
 
    return (gross);
} // pay