3 files changed, 209 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..33d4b39
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,83 @@
+#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;
+}
diff --git a/src/questions.c b/src/questions.c
new file mode 100644
index 0000000..88671a7
--- /dev/null
+++ b/src/questions.c
@@ -0,0 +1,92 @@
+#include "questions.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_LINE 512
+
+static int add_question(char ***arr, size_t *count, const char *text) {
+  char **tmp = realloc(*arr, (*count + 1) * sizeof(char *));
+  if (!tmp)
+    return EXIT_FAILURE;
+  *arr = tmp;
+
+  (*arr)[*count] = malloc(strlen(text) + 1);
+  if (!(*arr)[*count])
+    return EXIT_FAILURE;
+
+  strcpy((*arr)[*count], text);
+  (*count)++;
+  return EXIT_SUCCESS;
+}
+
+int load_questions(const char *filename, QuestionSet *qs) {
+  if (!filename || !qs)
+    return EXIT_FAILURE;
+
+  FILE *f = fopen(filename, "r");
+  if (!f)
+    return EXIT_FAILURE;
+
+  qs->general = NULL;
+  qs->major = NULL;
+  qs->general_count = 0;
+  qs->major_count = 0;
+
+  char line[MAX_LINE];
+  enum { NONE, GENERAL, MAJOR } mode = NONE;
+
+  while (fgets(line, sizeof(line), f)) {
+    line[strcspn(line, "\n")] = '\0';
+    if (line[0] == '\0')
+      continue;
+
+    if (strcmp(line, "#GENERAL") == 0) {
+      mode = GENERAL;
+      continue;
+    }
+    if (strcmp(line, "#MAJOR") == 0) {
+      mode = MAJOR;
+      continue;
+    }
+
+    int res = EXIT_FAILURE;
+    switch (mode) {
+    case GENERAL:
+      res = add_question(&qs->general, &qs->general_count, line);
+      break;
+    case MAJOR:
+      res = add_question(&qs->major, &qs->major_count, line);
+      break;
+    default:
+      continue; // ignore lines before section
+    }
+
+    if (res != EXIT_SUCCESS) {
+      fclose(f);
+      free_questions(qs);
+      return EXIT_FAILURE;
+    }
+  }
+
+  fclose(f);
+  return (qs->general_count && qs->major_count) ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+
+void free_questions(QuestionSet *qs) {
+  if (!qs)
+    return;
+
+  for (size_t i = 0; i < qs->general_count; i++)
+    free(qs->general[i]);
+  for (size_t i = 0; i < qs->major_count; i++)
+    free(qs->major[i]);
+
+  free(qs->general);
+  free(qs->major);
+
+  qs->general = NULL;
+  qs->major = NULL;
+  qs->general_count = 0;
+  qs->major_count = 0;
+}
diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..c139929
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,34 @@
+#include "utils.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+void print_line(void) {
+  printf("--------------------------------------------------\n");
+}
+
+void wait_enter(const char *msg) {
+  if (msg)
+    printf("%s", msg);
+  int c;
+  while ((c = getchar()) != '\n' && c != EOF)
+    ;
+}
+
+char ask_yes_no(const char *msg) {
+  char c = 'n';
+  printf("%s", msg);
+  if (scanf(" %c", &c) != 1)
+    c = 'n';
+  int flush;
+  while ((flush = getchar()) != '\n' && flush != EOF)
+    ;
+  return c;
+}
+
+void now_str(char *buf, size_t size) {
+  time_t t = time(NULL);
+  strftime(buf, size, "%Y-%m-%d %H:%M:%S", localtime(&t));
+}
+
+size_t rand_index(size_t max) { return max ? (size_t)(rand() % max) : 0; }