#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "questions.h"
#include "utils.h"

int main(void) {
    srand((unsigned)time(NULL));

    // utwórz katalog data/ jeśli nie istnieje
    struct stat st = {0};
    if (stat("data", &st) == -1) {
#ifdef _WIN32
        _mkdir("data");
#else
        mkdir("data", 0755);
#endif
    }

    QuestionSet qs;
    if (load_questions("data/questions.txt", &qs) != EXIT_SUCCESS) {
        fprintf(stderr, "Error: cannot load questions file\n");
        return EXIT_FAILURE;
    }

    FILE *csv = fopen("data/results.csv", "a");
    if (!csv) {
        perror("CSV open");
        free_questions(&qs);
        return EXIT_FAILURE;
    }

    int limit = 0;
    printf("Time limit (sec, 0 = unlimited): ");
    if (scanf("%d", &limit) != 1) limit = 0;
    wait_enter(NULL);

    size_t total = 0, correct = 0;
    char cont = 'y';

    while (cont == 'y' || cont == 'Y') {
        const char *g = qs.general[rand_index(qs.general_count)];
        const char *m = qs.major[rand_index(qs.major_count)];

        print_line();
        printf("GENERAL:\n%s\n\nMAJOR:\n%s\n", g, m);
        print_line();

        wait_enter("Press ENTER to start...");
        time_t start = time(NULL);

        wait_enter("Press ENTER when done...");
        double duration = difftime(time(NULL), start);

        if (limit > 0 && duration > limit)
            printf("Time exceeded!\n");

        char ans = ask_yes_no("Correct? (y/n): ");
        if (ans == 'y' || ans == 'Y') correct++;
        total++;

        char ts[32];
        now_str(ts, sizeof(ts));
        fprintf(csv, "\"%s\",\"%s\",\"%s\",%c,%.0f\n", ts, g, m, ans, duration);

        printf("Score: %zu/%zu (%.1f%%)\n",
               correct, total,
               total ? (double)correct / total * 100 : 0.0);

        cont = ask_yes_no("Next? (y/n): ");
    }

    printf("\nSession score: %.1f%%\n",
           total ? (double)correct / total * 100 : 0.0);

    fclose(csv);
    free_questions(&qs);

    return EXIT_SUCCESS;
}