//********************************************************
//
// Assignment 8 - Structures and Strings and Pointers
//
// Name: <replace with your name>
//
// Class: C Programming, <replace with Semester and Year>
//
// Date: <replace with the current date>
//
// Description: Program which determines overtime and 
// gross pay for a set of employees with outputs sent 
// to standard output (the screen).
//
// This assignment also adds the employee name, their tax state,
// and calculates the state tax, federal tax, and net pay.   It
// also calculates totals, averages, minimum, and maximum values.
//
// Array and Structure references are to be replaced with
// pointer references to speed up the processing of this code.
//
// Call by Reference design (using pointers)
//
//********************************************************

#include <stdio.h>
#include <string.h>
#include <ctype.h>

// Define constants
#define SIZE 5
#define STD_HOURS 40.0
#define OT_RATE 1.5
#define MA_TAX_RATE 0.05
#define NH_TAX_RATE 0.0
#define VT_TAX_RATE 0.06
#define CA_TAX_RATE 0.07
#define DEFAULT_TAX_RATE 0.08
#define NAME_SIZE 20
#define TAX_STATE_SIZE 3
#define FED_TAX_RATE 0.25
#define FIRST_NAME_SIZE 10
#define LAST_NAME_SIZE 10

// Define a structure type to store an employee name
struct name {
    char firstName[FIRST_NAME_SIZE];
    char lastName[LAST_NAME_SIZE];
};

// Define a structure type to pass employee data between functions
struct employee {
    struct name empName;
    char taxState[TAX_STATE_SIZE];
    long int clockNumber;
    float wageRate;
    float hours;
    float overtimeHrs;
    float grossPay;
    float stateTax;
    float fedTax;
    float netPay;
};

// This structure type defines the totals of all floating point items
struct totals {
    float total_wageRate;
    float total_hours;
    float total_overtimeHrs;
    float total_grossPay;
    float total_stateTax;
    float total_fedTax;
    float total_netPay;
};

// This structure type defines the min and max values of all floating point items
struct min_max {
    float min_wageRate;
    float min_hours;
    float min_overtimeHrs;
    float min_grossPay;
    float min_stateTax;
    float min_fedTax;
    float min_netPay;
    float max_wageRate;
    float max_hours;
    float max_overtimeHrs;
    float max_grossPay;
    float max_stateTax;
    float max_fedTax;
    float max_netPay;
};

// Function Prototypes
void getHours(struct employee *emp_ptr, int theSize);
void printEmp(struct employee *emp_ptr, int theSize);
void calcEmployeeTotals(struct employee *emp_ptr, struct totals *emp_totals_ptr, int theSize);
void calcEmployeeMinMax(struct employee *emp_ptr, struct min_max *emp_minMax_ptr, int theSize);
void printHeader(void);
void calcOvertimeHrs(struct employee *emp_ptr, int theSize);
void calcGrossPay(struct employee *emp_ptr, int theSize);
void calcStateTax(struct employee *emp_ptr, int theSize);
void calcFedTax(struct employee *emp_ptr, int theSize);
void calcNetPay(struct employee *emp_ptr, int theSize);
void printEmpStatistics(struct totals *emp_totals_ptr, struct min_max *emp_minMax_ptr, int theSize);

int main() {
    struct employee employeeData[SIZE] = {
        {{"Connie", "Cobol"}, "MA", 98401, 10.60, 51.0},
        {{"Mary", "Apl"}, "NH", 526488, 9.75, 42.5},
        {{"Frank", "Fortran"}, "VT", 765349, 10.50, 37.0},
        {{"Jeff", "Ada"}, "NY", 34645, 12.25, 45.0},
        {{"Anton", "Pascal"}, "CA", 127615, 8.35, 40.0}
    };
    
    struct totals employeeTotals = {0, 0, 0, 0, 0, 0, 0};
    struct min_max employeeMinMax = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
    
    struct employee *emp_ptr = employeeData;
    struct totals *emp_totals_ptr = &employeeTotals;
    struct min_max *emp_minMax_ptr = &employeeMinMax;

    // Call functions to read and calculate employee data
    getHours(emp_ptr, SIZE);
    calcOvertimeHrs(emp_ptr, SIZE);
    calcGrossPay(emp_ptr, SIZE);
    calcStateTax(emp_ptr, SIZE);
    calcFedTax(emp_ptr, SIZE);
    calcNetPay(emp_ptr, SIZE);
    calcEmployeeTotals(emp_ptr, emp_totals_ptr, SIZE);
    calcEmployeeMinMax(emp_ptr, emp_minMax_ptr, SIZE);

    // Print headers and employee details
    printHeader();
    printEmp(emp_ptr, SIZE);
    printEmpStatistics(emp_totals_ptr, emp_minMax_ptr, SIZE);

    return 0;
}

// Function Definitions

void getHours(struct employee *emp_ptr, int theSize) {
    for (int i = 0; i < theSize; ++i) {
        printf("\nEnter hours worked by emp # %06li: ", emp_ptr->clockNumber);
        scanf("%f", &emp_ptr->hours);
        ++emp_ptr;
    }
}

void printHeader(void) {
    printf("\n\n*** Pay Calculator ***\n");
    printf("---------------------------------------------------------------------------------\n");
    printf("Name                Tax  Clock#  Wage   Hours  OT   Gross   State  Fed      Net\n");
    printf("                   State                            Pay     Tax    Tax      Pay\n");
    printf("---------------------------------------------------------------------------------\n");
}

void printEmp(struct employee *emp_ptr, int theSize) {
    char name[FIRST_NAME_SIZE + LAST_NAME_SIZE + 1];
    for (int i = 0; i < theSize; ++i) {
        snprintf(name, sizeof(name), "%s %s", emp_ptr->empName.firstName, emp_ptr->empName.lastName);
        printf("%-20.20s %-2.2s  %06li  %5.2f  %5.1f %5.1f %8.2f %7.2f %7.2f %8.2f\n",
               name, emp_ptr->taxState, emp_ptr->clockNumber, 
               emp_ptr->wageRate, emp_ptr->hours,
               emp_ptr->overtimeHrs, emp_ptr->grossPay, 
               emp_ptr->stateTax, emp_ptr->fedTax, 
               emp_ptr->netPay);
        ++emp_ptr;
    }
    printf("---------------------------------------------------------------------------------\n");
}

void calcOvertimeHrs(struct employee *emp_ptr, int theSize) {
    for (int i = 0; i < theSize; ++i) {
        emp_ptr->overtimeHrs = (emp_ptr->hours > STD_HOURS) ? emp_ptr->hours - STD_HOURS : 0;
        ++emp_ptr;
    }
}

void calcGrossPay(struct employee *emp_ptr, int theSize) {
    for (int i = 0; i < theSize; ++i) {
        float normalPay = emp_ptr->wageRate * (emp_ptr->hours - emp_ptr->overtimeHrs);
        float overtimePay = emp_ptr->overtimeHrs * OT_RATE * emp_ptr->wageRate;
        emp_ptr->grossPay = normalPay + overtimePay;
        ++emp_ptr;
    }
}

void calcStateTax(struct employee *emp_ptr, int theSize) {
    for (int i = 0; i < theSize; ++i) {
        if (strcmp(emp_ptr->taxState, "MA") == 0)
            emp_ptr->stateTax = emp_ptr->grossPay * MA_TAX_RATE;
        else if (strcmp(emp_ptr->taxState, "VT") == 0)
            emp_ptr->stateTax = emp_ptr->grossPay * VT_TAX_RATE;
        else if (strcmp(emp_ptr->taxState, "NH") == 0)
            emp_ptr->stateTax = emp_ptr->grossPay * NH_TAX_RATE;
        else if (strcmp(emp_ptr->taxState, "CA") == 0)
            emp_ptr->stateTax = emp_ptr->grossPay * CA_TAX_RATE;
        else
            emp_ptr->stateTax = emp_ptr->grossPay * DEFAULT_TAX_RATE;
        ++emp_ptr;
    }
}

void calcFedTax(struct employee *emp_ptr, int theSize) {
    for (int i = 0; i < theSize; ++i) {
        emp_ptr->fedTax = emp_ptr->grossPay * FED_TAX_RATE;
        ++emp_ptr;
    }
}

void calcNetPay(struct employee *emp_ptr, int theSize) {
    for (int i = 0; i < theSize; ++i) {
        emp_ptr->netPay = emp_ptr->grossPay - (emp_ptr->stateTax + emp_ptr->fedTax);
        ++emp_ptr;
    }
}

void calcEmployeeTotals(struct employee *emp_ptr, struct totals *emp_totals_ptr, int theSize) {
    for (int i = 0; i < theSize; ++i) {
        emp_totals_ptr->total_wageRate += emp_ptr->wageRate;
        emp_totals_ptr->total_hours += emp_ptr->hours;
        emp_totals_ptr->total_overtimeHrs += emp_ptr->overtimeHrs;
        emp_totals_ptr->total_grossPay += emp_ptr->grossPay;
        emp_totals_ptr->total_stateTax += emp_ptr->stateTax;
        emp_totals_ptr->total_fedTax += emp_ptr->fedTax;
        emp_totals_ptr->total_netPay += emp_ptr->netPay;
        ++emp_ptr;
    }
}

void calcEmployeeMinMax(struct employee *emp_ptr, struct min_max *emp_minMax_ptr, int theSize) {
    emp_minMax_ptr->min_wageRate = emp_minMax_ptr->max_wageRate = emp_ptr->wageRate;
    emp_minMax_ptr->min_hours = emp_minMax_ptr->max_hours = emp_ptr->hours;
    emp_minMax_ptr->min_overtimeHrs = emp_minMax_ptr->max_overtimeHrs = emp_ptr->overtimeHrs;
    emp_minMax_ptr->min_grossPay = emp_minMax_ptr->max_grossPay = emp_ptr->grossPay;
    emp_minMax_ptr->min_stateTax = emp_minMax_ptr->max_stateTax = emp_ptr->stateTax;
    emp_minMax_ptr->min_fedTax = emp_minMax_ptr->max_fedTax = emp_ptr->fedTax;
    emp_minMax_ptr->min_netPay = emp_minMax_ptr->max_netPay = emp_ptr->netPay;

    for (int i = 1; i < theSize; ++i) {
        ++emp_ptr;
        if (emp_ptr->wageRate < emp_minMax_ptr->min_wageRate) emp_minMax_ptr->min_wageRate = emp_ptr->wageRate;
        if (emp_ptr->wageRate > emp_minMax_ptr->max_wageRate) emp_minMax_ptr->max_wageRate = emp_ptr->wageRate;
        if (emp_ptr->hours < emp_minMax_ptr->min_hours) emp_minMax_ptr->min_hours = emp_ptr->hours;
        if (emp_ptr->hours > emp_minMax_ptr->max_hours) emp_minMax_ptr->max_hours = emp_ptr->hours;
        if (emp_ptr->overtimeHrs < emp_minMax_ptr->min_overtimeHrs) emp_minMax_ptr->min_overtimeHrs = emp_ptr->overtimeHrs;
        if (emp_ptr->overtimeHrs > emp_minMax_ptr->max_overtimeHrs) emp_minMax_ptr->max_overtimeHrs = emp_ptr->overtimeHrs;
        if (emp_ptr->grossPay < emp_minMax_ptr->min_grossPay) emp_minMax_ptr->min_grossPay = emp_ptr->grossPay;
        if (emp_ptr->grossPay > emp_minMax_ptr->max_grossPay) emp_minMax_ptr->max_grossPay = emp_ptr->grossPay;
        if (emp_ptr->stateTax < emp_minMax_ptr->min_stateTax) emp_minMax_ptr->min_stateTax = emp_ptr->stateTax;
        if (emp_ptr->stateTax > emp_minMax_ptr->max_stateTax) emp_minMax_ptr->max_stateTax = emp_ptr->stateTax;
        if (emp_ptr->fedTax < emp_minMax_ptr->min_fedTax) emp_minMax_ptr->min_fedTax = emp_ptr->fedTax;
        if (emp_ptr->fedTax > emp_minMax_ptr->max_fedTax) emp_minMax_ptr->max_fedTax = emp_ptr->fedTax;
        if (emp_ptr->netPay < emp_minMax_ptr->min_netPay) emp_minMax_ptr->min_netPay = emp_ptr->netPay;
        if (emp_ptr->netPay > emp_minMax_ptr->max_netPay) emp_minMax_ptr->max_netPay = emp_ptr->netPay;
    }
}

void printEmpStatistics(struct totals *emp_totals_ptr, struct min_max *emp_minMax_ptr, int theSize) {
    printf("Totals:                          %.2f %.1f %.1f %.2f %.2f %.2f %.2f\n",
           emp_totals_ptr->total_wageRate, emp_totals_ptr->total_hours,
           emp_totals_ptr->total_overtimeHrs, emp_totals_ptr->total_grossPay,
           emp_totals_ptr->total_stateTax, emp_totals_ptr->total_fedTax,
           emp_totals_ptr->total_netPay);

    if (theSize > 0) {
        printf("Averages:                        %.2f %.1f %.1f %.2f %.2f %.2f %.2f\n",
               emp_totals_ptr->total_wageRate / theSize,
               emp_totals_ptr->total_hours / theSize,
               emp_totals_ptr->total_overtimeHrs / theSize,
               emp_totals_ptr->total_grossPay / theSize,
               emp_totals_ptr->total_stateTax / theSize,
               emp_totals_ptr->total_fedTax / theSize,
               emp_totals_ptr->total_netPay / theSize);
    }

    printf("Minimum:                         %.2f %.1f %.1f %.2f %.2f %.2f %.2f\n",
           emp_minMax_ptr->min_wageRate, emp_minMax_ptr->min_hours,
           emp_minMax_ptr->min_overtimeHrs, emp_minMax_ptr->min_grossPay,
           emp_minMax_ptr->min_stateTax, emp_minMax_ptr->min_fedTax,
           emp_minMax_ptr->min_netPay);

    printf("Maximum:                         %.2f %.1f %.1f %.2f %.2f %.2f %.2f\n",
           emp_minMax_ptr->max_wageRate, emp_minMax_ptr->max_hours,
           emp_minMax_ptr->max_overtimeHrs, emp_minMax_ptr->max_grossPay,
           emp_minMax_ptr->max_stateTax, emp_minMax_ptr->max_fedTax,
           emp_minMax_ptr->max_netPay);
}