//=========================================================================
#define PROGRAMMER "SOLUTIONS, NoFrills"
#define PROG_CODE  "soln"
#define COURSE     "ECE-1021"
#define YEAR       (2003)
#define TERM       "Fall"
#define SECTION    (0)
#define ASSIGNMENT "HW #1A"
#define REVISION   (0)
#define TITLE      "How much did that REALLY cost"
#define SUBTITLE   ""
#define EMAIL      "wbahn@eas.uccs.edu"
#define FILENAME   "01a0soln.c"
//=========================================================================

// PROBLEM:
//
// Given the Terms for a typical credit card, determine the total cost
// of an item purchased on credit and how long it will take to pay it off
// if only the minimum payment due is made each month
//
// PSEUDOCODE:
//
// The full pseudocode is in file 01A0SOLN.TXT
//
// A high level abstract is given below:
//
// 1) TASK: Get necessary data from user.
// 2) TASK: Generate Monthly Statements until paid off
// 2.1) TASK: Print Column Headings. (all on same line)
// 2.2) TASK: Initialize necessary variables.
// 2.3) WHILE: (balance > 0)
// 2.3.1) TASK: Calculate Monthly Statement values
// 2.3.1.6) TASK: Compute Minimum Payment for next month
// 2.3.2) TASK: Print Monthly Statement values.
// 2.3.3) TASK: Update necessary variables
// 3) TASK: Print Summary Information
//
//== SUMMARY OF DEVIATIONS FROM PSEUDOCODE ================================
//
// The computed Finance Charge is rounded to the nearest penny.
//
// 1) TASK: Compute Finance Charge (f)
// 2) TASK: Round f to the nearest penny
// 2.1) SET: f = (int(100*f + 0.5) )/100  (use type casting in C)

//== INCLUDE FILES ========================================================
#include <stdio.h> // printf()

//== FUNCTION PROTOTYPES ==================================================
void PrintHeader(void);

//== MAIN FUNCTION ========================================================
int main(void)
{
	int Month;
	double Price, Rate, FractionalMin, AbsoluteMin;
	double Opening, Closing, FinCharge, PmtRec, MinDue, TotalCost;

	PrintHeader();
	printf("\n"); // Print a blank line

	// 1) TASK: Get necessary data from user.
	printf("Enter the purchase price: ");
	scanf("%lf", &Price);

	printf("Enter the annual interest rate (as a percentage): ");
	scanf("%lf", &Rate);
	Rate /= 100.0;  // Adjust the entered percentage to a decimal value

	printf("Enter the minimum monthly fraction (as a percentage): ");
	scanf("%lf", &FractionalMin);
	FractionalMin /= 100.0;  // Adjust to a decimal value

	printf("Enter the minimum monthly payment: ");
	scanf("%lf", &AbsoluteMin);

	// 2) TASK: Generate Monthly Statements until paid off
	// 2.1) TASK: Print Column Headings. (all on same line)
	printf("\n");
	printf("Amortization Schedule assuming Minimum Payments\n");
	printf("\n");
	printf("Month | Opening | Pmt Rec | Finance | Closing | Min Due\n");

	// 2.2) TASK: Initialize necessary variables.
	Month = 0;
	Closing = Price;
	MinDue = 0.0;
	TotalCost = 0.0;

	// 2.3) WHILE: (balance > 0)
	while(Closing > 0.0)
	{
		// 2.3.1) TASK: Calculate Monthly Statement values
		Month++;
		Opening = Closing;
		FinCharge = Opening * Rate / 12.0;
		FinCharge = (double)((long int)((FinCharge * 100.0) + 0.5) )/100;
		PmtRec = MinDue;
		Closing = Opening + FinCharge - PmtRec;

		// 2.3.1.6) TASK: Compute Minimum Payment for next month
		MinDue = Closing*FractionalMin;
		if(MinDue < AbsoluteMin)
			MinDue = AbsoluteMin;
		if(MinDue > Closing)
			MinDue = Closing;

		// 2.3.2) TASK: Print Monthly Statement values.
		printf(" %4i |", Month);
		printf(" % 7.2f |", Opening);
		printf(" % 7.2f |", PmtRec);
		printf(" % 7.2f |", FinCharge);
		printf(" % 7.2f |", Closing);
		printf(" % 7.2f", MinDue);
		printf("\n");

		// 2.3.3) TASK: Update necessary variables
		TotalCost += PmtRec;
	}

	// 3) TASK: Print Summary Information
	printf("\n");
	printf("Total Cost Summary\n");
	printf("Purchase Price: .............. %7.2f\n", Price);
	printf("Months Required to Pay Off:... %i\n", Month);
	printf("Total Finance Charge: ........ %7.2f\n", TotalCost - Price);
	printf("Total Cost: .................. %7.2f\n", TotalCost);

	return(0);
}

//== SUPPORT FUNCTIONS ====================================================
void PrintHeader(void)
{
	printf("========================================"
			 "=======================================\n");
	printf("Course....... %s-%i (%s %i)\n", COURSE, SECTION, TERM, YEAR);
	printf("Programmer... %s (%s)\n", PROGRAMMER, PROG_CODE);
	printf("Assignment... %s (Rev %i) (Source Code in %s)\n",
		ASSIGNMENT, REVISION, FILENAME);
	printf("Description.. %s\n", TITLE);
	printf("              %s\n", SUBTITLE);
	printf("========================================"
			 "=======================================\n");

	return;
}