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

#if 0
  #define PART part1
#else
  #define PART part2
#endif

#if 0
  #define FILENAME "sample.txt"
#else
  #define FILENAME "input.txt"
#endif

#define CMDS 2
char commands[CMDS][5] = {"noop", "addx"};
char cmdcycles[CMDS]   = {1, 2};

int x = 1;
int cycles = 0;
int sum = 0;

void part1()
{
    cycles++;

    if((cycles+20) % 40 == 0) sum += cycles * x;
}

void part2()
{
    int i = cycles % 40;
    printf("%c", (x == i || x == i+1 || x == i-1) ? '#' : '.');
    if(i == 39) printf("\n");

    cycles++;
}

int parse_cmd(char *cmdstr)
{
    for(int i = 0; i < CMDS; i++)
        if(strncmp(commands[i], cmdstr, 4) == 0) return i;
    return -1;
}

void parse()
{
    FILE *fp = fopen(FILENAME, "r");
    if(!fp) {
        fprintf(stderr, "ERROR: Could not open file: %s\n", FILENAME);
        exit(1);
    }

    char line[256];
    while(fgets(line, sizeof(line), fp))
    {
        int cmd = parse_cmd(strtok(line, " "));
        assert(cmd >= 0);

        for(int i = 0; i < cmdcycles[cmd]; i++)
        {
            PART();

            switch(cmd) {
            case 0:
                break;
            case 1:
                if(i == 1) x += atoi(strtok(NULL, " "));
                break;
            }

        }
    }

    fclose(fp);
}

int main(void)
{
    parse();
    printf("%d\n", sum);
    return 0;
}