/* Original Forge practice program. See LICENSE.txt. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>

int award_points(int tokens, int chain, int misses) {
    if (tokens > 99) tokens = 99;
    int points = tokens * 7;
    if (chain >= 3) points += 50;
    points -= misses * 2;
    return points < 0 ? 0 : points;
}

static int argument(const char *text, int *value) {
    char *end;
    errno = 0;
    long n = strtol(text, &end, 10);
    if (errno || end == text || *end || n < 0 || n > 999) return 0;
    *value = (int)n;
    return 1;
}

int main(int argc, char **argv) {
    int tokens, chain, misses;
    if (argc != 4 || !argument(argv[1], &tokens) ||
        !argument(argv[2], &chain) || !argument(argv[3], &misses)) {
        fprintf(stderr, "Use: score_lab TOKENS CHAIN MISSES (integers 0..999)\n");
        return 2;
    }
    printf("Forge practice score: %d\n", award_points(tokens, chain, misses));
    return 0;
}