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

// cubes, R, G, B
const int cubes[3] = {12, 13, 14};
const char *colors[] = {"red", "green", "blue"};

int getCubes(char *ptr);

int main ()
{
	int gameID = 0;
	int gameSum = 0;
	char row[160];
	char *ptr;
	int length = 0;
	int gameCubes[3] = {0, 0, 0};
	int gameHands = 0;
	int offset = 0;


	FILE *input;
	input = fopen("./input", "r");
	nextGame:
	// for each row
	while(fgets(row, 160, input) != NULL) {
		// increment game count
		gameID++;
		gameHands = 1;
		offset = 0;
		for (int i = 0; i < 3; i++) gameCubes[i] = 0; 
		
		// change each ; to \0
		while(ptr = strchr(ptr, ';')) {
			ptr[0] = '\0';
			gameHands++;
			ptr++;
		}

		// for each 'hand' (semicolon) ((NULL-char))
		for(gameHands; gameHands > 0; gameHands--) {
			// for each color
			for(int i = 0; i < 3; i++) {
				// use strstr to find color,
				// move pointer to the beginning of said colour
				ptr = strstr(row + offset, colors[i]);
				// if (strstr(row, colors[i]) != NULL)
				if (ptr != NULL)
					gameCubes[i] = getCubes(ptr);
				// higher than colors[i]? jump to next game
				if (gameCubes[i] > cubes[i]) {
					goto nextGame;
				}
			}
			// pointer = strstr \0 + 1
			offset += strlen(&row[offset]) + 1; 
			ptr = row + offset;
		}
		// hit \n? add game ID to sum
		printf("Game %d valid\n", gameID);
		gameSum += gameID;
	}

	printf("Game ID sum: %d\n", gameSum);
}

int getCubes(char *ptr) 
{
	int num = 0;

	// get two chars: pointer -3, pointer -2
	// convert them to an int
	if (ptr[-3] >= '0' && ptr[-3] <= '9') {
		num += (ptr[-3] - '0') * 10;
	}
	if (ptr[-2] >= '0' && ptr[-2] <= '9') {
		num += ptr[-2] - '0';
	}

	return num;
}