#include <stdio.h>  // Standard input-output header

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

// Define a structure to hold employee data
struct employee {
    long int clockNumber;
    float wageRate;
    float hours;
    float overtimeHrs;
    float grossPay;
};

// Function Prototypes
float getHours(long int clockNumber);
void printHeader(void);
void printEmp(long int clockNumber, float wageRate, float hours, float overtimeHrs, float grossPay);
void calculateOvertime(struct employee *emp);
void calculateGrossPay(struct employee *emp);

int main() {
    // Initialize employee data with clock number and wage rate
    struct employee employeeData[SIZE] = {
        {98401, 10.60, 0, 0, 0},
        {526488, 9.75, 0, 0, 0},
        {765349, 10.50, 0, 0, 0},
        {34645, 12.25, 0, 0, 0},
        {127615, 8.35, 0, 0, 0}
    };

    int i; // Loop index

    // Loop through employees to get hours, calculate overtime & gross pay
    for (i = 0; i < SIZE; ++i) {
        employeeData[i].hours = getHours(employeeData[i].clockNumber);
        calculateOvertime(&employeeData[i]);
        calculateGrossPay(&employeeData[i]);
    }

    // Print the column headers
    printHeader();

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

    return 0; // Program executed successfully
}

//**************************************************************
// Function: getHours
// Purpose: Gets user input for hours worked per employee
// Parameters: clockNumber - Unique employee ID
// Returns: hoursWorked - Hours worked in a given week
//**************************************************************
float getHours(long int clockNumber) {
    float hoursWorked;
    printf("Enter hours worked by emp #%06li: ", clockNumber);
    scanf("%f", &hoursWorked);
    return hoursWorked;
}

//**************************************************************
// Function: calculateOvertime
// Purpose: Calculates overtime hours worked
// Parameters: emp - Pointer to an employee structure
// Returns: void (modifies structure directly)
//**************************************************************
void calculateOvertime(struct employee *emp) {
    if (emp->hours > STD_HOURS) {
        emp->overtimeHrs = emp->hours - STD_HOURS;
    } else {
        emp->overtimeHrs = 0.0;
    }
}

//**************************************************************
// Function: calculateGrossPay
// Purpose: Calculates gross pay for an employee
// Parameters: emp - Pointer to an employee structure
// Returns: void (modifies structure directly)
//**************************************************************
void calculateGrossPay(struct employee *emp) {
    float regularPay, overtimePay;

    if (emp->hours > STD_HOURS) {
        regularPay = STD_HOURS * emp->wageRate;
        overtimePay = emp->overtimeHrs * emp->wageRate * OT_RATE;
    } else {
        regularPay = emp->hours * emp->wageRate;
        overtimePay = 0.0;
    }

    emp->grossPay = regularPay + overtimePay;
}

//**************************************************************
// Function: printHeader
// Purpose: Prints the table header
// Parameters: none
// Returns: void
//**************************************************************
void printHeader(void) {
    printf("\n*** Pay Calculator ***\n\n");
    printf("Clock#   Wage  Hours   OT   Gross\n");
    printf("----------------------------------\n");
}

//**************************************************************
// Function: printEmp
// Purpose: Prints employee details in a tabular format
// Parameters: 
//   - clockNumber: Unique employee ID
//   - wageRate: Hourly wage rate
//   - hours: Hours worked in the week
//   - overtimeHrs: Overtime hours worked
//   - grossPay: Gross pay for the week
// Returns: void
//**************************************************************
void printEmp(long int clockNumber, float wageRate, float hours, float overtimeHrs, float grossPay) {
    printf("%06li   %5.2f   %5.1f   %4.1f   %8.2f\n", clockNumber, wageRate, hours, overtimeHrs, grossPay);
}