// Jevin Olano
// jolano
// CSE 101
// November 9, 2019
// Arithmetic.c

#include <stdio.h>
#include <stdlib.h>
#include "List.h"
#include "BigInteger.h"

// helper
void readBigInteger(FILE* in, char *dest, int size) {
	dest[0] = fgetc(in);
	int i = 1;
	if (dest[0] == '-' || dest[0] == '+') {
		size++;
	}
	for (; i < size; i++) {
		dest[i] = fgetc(in);
	}
	dest[size] = '\0';
	printf("%s\n", dest);
}

int main(int argc, char* argv[]) {

	// Declarations -------------------------------------

  	FILE *in, *out; // handlers for input/output files
  	char line[256];
  	char stringA[256];
  	char stringB[256];
  	int size = 0;

	// Preliminary --------------------------------------

	// check command line for correct number of arguments
	if (argc != 3) {
		printf("Usage: %s <input> <output>\n", argv[0]);
		exit(1);
	}

	// open input file for reading
	in = fopen(argv[1], "r");
	if (in == NULL) {
		printf("Unable to read from file %s\n", argv[1]);
    	exit(1);
	}

  	// open output file for writing
  	out = fopen(argv[2], "w");
  	if (out == NULL) {
    	printf("Unable to write to file %s\n", argv[2]);
    	exit(1);
  	}

  	// Arithmetic Operations ----------------------------

  	fgets(line, sizeof(line), in); // 1st and 2nd line of input
  	sscanf(line, "%d", &size);
  	readBigInteger(in, stringA, size);

  	fgets(line, sizeof(line), in); // 3rd and 4th line of input
  	fgets(line, sizeof(line), in);
  	sscanf(line, "%d", &size);
  	readBigInteger(in, stringB, size);

  	BigInteger A = stringToBigInteger(stringA);
  	BigInteger B = stringToBigInteger(stringB);

  	// print A
  	printBigInteger(out, A);
  	fprintf(out, "\n");

  	// print B
  	printBigInteger(out, B);
  	fprintf(out, "\n");

  	// print A + B
  	BigInteger answer3 = sum(A, B);
  	printBigInteger(out, answer3);
  	fprintf(out, "\n");

  	// print A - B
  	BigInteger answer4 = diff(A, B);
  	printBigInteger(out, answer4);
  	fprintf(out, "\n");

  	// print A - A
  	BigInteger answer5 = diff(A, A);
  	printBigInteger(out, answer5);
  	freeBigInteger(&answer5);
  	fprintf(out, "\n");

  	// print 3A - 2B
  	BigInteger three = stringToBigInteger("3");
  	BigInteger two = stringToBigInteger("2");
  	BigInteger prodA = prod(A, three);
  	BigInteger prodB = prod(B, two);
  	BigInteger answer6 = diff(prodA, prodB);
  	printBigInteger(out, answer6);
  	freeBigInteger(&three);
  	freeBigInteger(&two);
  	freeBigInteger(&prodA);
  	freeBigInteger(&prodB);
  	freeBigInteger(&answer6);
  	fprintf(out, "\n");

  	// print AB
  	BigInteger answer7 = prod(A, B);
  	printBigInteger(out, answer7);
  	fprintf(out, "\n");

  	// print A^2
  	BigInteger answer8 = prod(A, A);
  	printBigInteger(out, answer8);
  	fprintf(out, "\n");

  	// print B^2
  	BigInteger answer9 = prod(B, B);
  	printBigInteger(out, answer9);
  	fprintf(out, "\n");

  	// print 9A^4 + 16B^5
  	BigInteger fourthPower1 = prod(answer8, answer8);
  	BigInteger fourthPower2 = prod(answer9, answer9);
  	BigInteger fifthPower = prod(fourthPower2, B);
  	BigInteger nine = stringToBigInteger("9");
  	BigInteger sixteen = stringToBigInteger("16");
  	BigInteger partA = prod(fourthPower1, nine);
  	BigInteger partB = prod(fifthPower, sixteen);
  	BigInteger answer10 = sum(partA, partB);
  	printBigInteger(out, answer10);
  	freeBigInteger(&answer8);
  	freeBigInteger(&answer9);
  	freeBigInteger(&fourthPower1);
  	freeBigInteger(&fourthPower2);
  	freeBigInteger(&fifthPower);
  	freeBigInteger(&nine);
  	freeBigInteger(&sixteen);
  	freeBigInteger(&partA);
  	freeBigInteger(&partB);
  	freeBigInteger(&answer10);
  	fprintf(out, "\n");

  	// close input and output files
   	fclose(in);
   	fclose(out);

  	return(EXIT_SUCCESS);
}