/*
	Course Number   : ISYS 116
	Student Name    : Jason Gradziel
	Student Number  : 826-135-535
	Professors Name : Gene Rychlewski
	Class Name      : Thursday
	Lab Title       : PAYROL3
	*/

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <dos.h>

float hours,
      rate_per_hour,
      gross_pay,
      taxrate,
      Tax,
      RESP,
      EI,
      CPP,
      Total,
      net_pay;
int   dependents,
      counter;

int setup(char IDcode[6],char fname[16],char lname[21],
					int cntr,int employees);
int process();
int wrapup(char IDcode[6],char fname[16],char lname[21]);
int data_item();
int tax_rate();
int tax_deduction();
int print_headers();
int print_details();

void main(void)
{
	char  IDcode[6],
	      fname[16],
	      lname[21],
	      *num;
	int   employees,
	      flag=1,
	      cntr=0;

	while(flag==1)
	{
		clrscr();
		gotoxy(20,10);
		printf("Enter in a number :");
		gotoxy(25,11);
		printf("1. Run Pay Roll Program");
		gotoxy(25,12);
		printf("2. Exit");
		gotoxy(40,10);
		*num = getch();
		*num = atoi(num);

		if (*num == 1)
		{
			gotoxy(10,15);
			printf("How many times do you want to run the program ? : ");
			scanf("%d",&employees);
			fflush(stdin);
			for(cntr=1; cntr<=employees; cntr++)
			{
				setup(IDcode,fname,lname,cntr,employees);
				process();
				wrapup(IDcode,fname,lname);
			}
		}
		else
			flag = 0;
	}
}

int setup(char IDcode[6],char fname[16],
			 char lname[21],int cntr,int employees)
{
	clrscr();
	/* 1.1 initial counter to 0.*/
	counter=0;
	/* 1.2 get & count input data. */
	gotoxy(35,2);
	printf("PAY ROLL");
	gotoxy(70,2);
	printf("%d of %d",cntr,employees);
	gotoxy(4,7);
	printf("Please enter in the following");
	data_item();
	gotoxy(16,8);
	printf("Employee ID code (A-001) : ");
	gets(IDcode);
	data_item();
	gotoxy(21,9);
	printf("First name (max 15) : ");
	gets(fname);
	data_item();
	gotoxy(22,10);
	printf("Last name (max 20) : ");
	gets(lname);
	data_item();
	gotoxy(16,11);
	printf("The number of dependents : ");
	scanf("%d",&dependents);
	fflush(stdin);
	data_item();
	gotoxy(9,12);
	printf("Number of hours worked (week) ? : ");
	scanf("%f",&hours);
	data_item();
	gotoxy(25,13);
	printf("Rate per hour ? : ");
	scanf("%f",&rate_per_hour);
	data_item();

	gotoxy(25,14);
	printf("Scanning");
	for (int a=0; a<10; a++)
		{
		delay(200);
		printf(".");
		}

	gotoxy(25,14);
	printf("                      ");
	return 0;
}

int process()
{
	/* 2.1.1 Calculate gross pay */
	gross_pay = hours * rate_per_hour;
	/* 2.1.2 Function tax rate */
	tax_rate();
	/* 2.2 Calculations */
	/* 2.2.2 call tax decduction */
	tax_deduction();
	/* 2.2.3 */
	net_pay = gross_pay - Total;

	return 0;
}

int wrapup(char IDcode[6], char fname[16], char lname[21])
{
	/* 3.1 print headers */
	print_headers();

	/* 3.2 print details */
	print_details();

	gotoxy(50,25);
	printf("PROGRAM COMPLETE");

	/* clean up */
	getch();
	fflush(stdin);
	clrscr();
	return 0;
}

int data_item()
{
	/* increase counter by 1 */
	gotoxy(1,25);
	printf("Data item # %d",counter);
	counter++;
	return 0;
}

tax_rate()
{
	/* 2.1 check tax rate */
	if (dependents<3)
		{
		if (gross_pay<300)
			taxrate=0.2;
		else if (gross_pay>800)
			taxrate=0.4;
		else
			taxrate=0.3;
		}
	else
		{
		if (gross_pay<300)
			taxrate=0.15;
		else if (gross_pay > 800)
			taxrate=0.35;
		else
			taxrate=0.25;
		}

	return 0;
}

int tax_deduction()
{
	/* 2.2.2 */
	Tax   = gross_pay * taxrate;
	RESP  = dependents * 25;
	EI    = gross_pay * 0.005;
	CPP   = gross_pay * 0.01;
	Total = Tax + RESP + EI + CPP;

	return 0;
}

int print_headers()
{
	/* 3.1 */
	gotoxy(2,20);
	printf("Gross Pay");
	gotoxy(2,21);
	printf("---------");

	gotoxy(14,20);
	printf("Tax Rate");
	gotoxy(14,21);
	printf("--------");

	gotoxy(26,20);
	printf("Deduction for Tax Purposes");
	gotoxy(26,21);
	printf("--------------------------");
	gotoxy(25,22);
	printf("Tax");
	gotoxy(32,22);
	printf("RESP");
	gotoxy(39,22);
	printf("EI");
	gotoxy(45,22);
	printf("CPP");
	gotoxy(52,22);
	printf("Total");

	gotoxy(64,20);
	printf("Net Pay");
	gotoxy(64,21);
	printf("-------");

	return 0;
}

int print_details()
{
	/* 3.2 */
	gotoxy(3,23);
	printf("%.2f",gross_pay);
	gotoxy(15,23);
	printf("%.2f",taxrate);
	gotoxy(24,23);
	printf("%.2f",Tax);
	gotoxy(32,23);
	printf("%.2f",RESP);
	gotoxy(39,23);
	printf("%.2f",EI);
	gotoxy(45,23);
	printf("%.2f",CPP);
	gotoxy(52,23);
	printf("%.2f",Total);
	gotoxy(64,23);
	printf("%.2f",net_pay);

	return 0;
}