//-------------------------------------------------------
// PbO Example demonstrating the use of nested and
// 		distributed choices
//
// Written by: Quinn Hsu
// Exposed three discount percentages
// Exposed whether discounts should be applied
//-------------------------------------------------------

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

struct item {
	char* name;
	double value;
};

int main( int args, char** argv) {
	const int TERM_WIDTH = 80;
	
	struct item item1, item2, item3;
	
	double tax = 0.12;
	double discount = 0;
	
	// first reference to the distributed CHOICE discount
	##BEGIN CHOICE discount
		// we can also nest choices
		##BEGIN CHOICE discount_amount=fifty
			discount=0.5;
		##CHOICE discount_amount=thirty
			discount=0.3;
		##CHOICE discount_amount=ten
			discount=0.1;
		##END CHOICE discount_amount
	##END CHOICE discount
	
	
	item1.name = "NESTLE Smarties";
	item1.value = 2.99;
	
	item2.name = "TOBLERONE Milk Rose";
	item2.value = 4.99;
	
	item3.name = "Peaceable Kingdom Cupcake Valentine Heart Pack";
	item3.value = 8.07;

	struct item items[] = {item1, item2, item3};
	
	int i;
	
	double subtotal = 0;
	for(i = 0; i < 3; i++) {
		printf("%s%*.2f\n",items[i].name,(int)(TERM_WIDTH-strlen(items[i].name)) ,items[i].value);
		subtotal += items[i].value;
	}
	
	for(i=0; i<TERM_WIDTH; i++) { printf("-"); }
	printf("\n");
	
	printf("Subtotal%*.2f\n\n", (int)(TERM_WIDTH-strlen("subtotal")), subtotal);
	
	// here we reference the discount CHOICE again
	##BEGIN CHOICE discount
		printf("Discount%*.2f\n", (int)(TERM_WIDTH-strlen("discount")), -1*subtotal*discount);
	##END CHOICE discount
	
	printf("Tax%+*.2f\n", (int)(TERM_WIDTH-strlen("tax")), subtotal*tax);
	
	for(i=0; i<TERM_WIDTH; i++) { printf("-"); }
	printf("\n");
	
	printf("Total%*.2f\n", (int)(TERM_WIDTH-strlen("total")), subtotal*(1+(tax-discount)));

	return 0;
}