//********************************************************
//
// Assignment 6 - Structures
//
// Name: Jessica Theman
//
// Class: C Programming, 2025 Fall
//
// Date: December 03, 2025 - late submission
//
// 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

// Define a global structure to pass employee data between functions
// Note that the structure type is global, but you don't want a variable
// of that type to be global. Best to declare a variable of that type
// in a function like main or another function and pass as needed.

struct employee
{
    long int clockNumber;
    float wageRate;
    float hours;
    float overtimeHrs;
    float grossPay;
};

// define prototypes here for each function except main
float getHours    (long int clockNumber);
float calcOT      (float hours);
float calcGross   (float wageRate, float hours, float overtimeHrs);
void printHeader  (void);
void printEmp     (long int clockNumber, float wageRate, float hours,
                   float overtimeHrs, float grossPay);


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); 

       // Function call to calculate overtime pay
       employeeData[i].overtimeHrs = calcOT (employeeData[i].hours);
       
       // Function call to calculate gross pay
       employeeData[i].grossPay = calcGross (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: calcOT
// 
// Purpose: To calculate the number of overtime hours each employee works
// 
// Parameters: hours - total number of hours worked during the week
// 
// Returns: overtimeHrs - Overtime hours - if no overtime hours, then 0
//**************************************************************

float calcOT (float hours) 
{
	float overtimeHrs = 0.0; // 0 if no overtime hours
	
	if (hours > STD_HOURS) {
		overtimeHrs = hours - STD_HOURS;
	}
	return (overtimeHrs);
	
} // calcOT

//**************************************************************
// Function: calcGross
// 
// Purpose: To calculate the gross pay for each employee, using standard
//          pay and overtime pay.
// 
// Parameters: hours - total number of hours worked during the week
//			   wageRate - hourly wage rate
//			   overtimeHrs - overtime hours that were worked in a week by an employee
// 
// Returns: grossPay - total gross pay
//**************************************************************

float calcGross (float wageRate, float hours, float overtimeHrs) 
{ 
	float grossPay;
	float standardHrs;
	if (overtimeHrs > 0) {
		standardHrs = STD_HOURS; 
	} else {
		standardHrs = hours;
	}
	
	// Calculate gross pay
	grossPay = (standardHrs * wageRate) + (overtimeHrs * wageRate * OT_RATE);
	
	return (grossPay);
	
} // calcGross

//**************************************************************
// 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