Shuffle cards

card.c

@@ -1,3 +1,6 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
 #include "card.h"
 
 static Vector2 card_size = (Vector2) { CARD_WIDTH, CARD_HEIGHT };
@@ -26,3 +29,14 @@ bool point_within_card(Card *c, Vector2 point) {
   return point.x > c->position.x && point.x < c->position.x + card_size.x &&
     point.y > c->position.y && point.y < c->position.y + card_size.y;
 }
+
+void shuffle_hand(Hand *h) {
+  srand(time(NULL));
+  Card *swap;
+  for (int i = h->count - 1; i >= 0; i--) {
+    int index = rand() % (i + 1);
+    swap = h->cards[i];
+    h->cards[i] = h->cards[index];
+    h->cards[index] = swap;
+  }
+}

card.h

@@ -55,5 +55,6 @@ struct Hand {
 
 void draw_card(Card *c, Texture2D *cards_texture);
 bool point_within_card(Card *c, Vector2 v);
+void shuffle_hand(Hand *h);
 
 #endif

game.c

@@ -1,4 +1,5 @@
 #include <string.h>
+#include <stdio.h>
 
 #include "game.h"
 #include "card.h"
@@ -47,8 +48,12 @@ void initialize_game(Game *g) {
       t = ANIMAL; break;
     }
     g->cards[i] = (Card) { i, t, rt, month, (Vector2) { month * 75, (i % 4) * 123 }, false };
+    g->deck.cards[i] = &g->cards[i];
+    g->deck.count++;
   }
 
+  shuffle_hand(&g->deck);
+
   strcpy(teyaku_calculation, "");
   strcpy(dekiyaku_calculation, "");
 

game.h

@@ -11,7 +11,7 @@ struct Game {
   bool should_close;
   Card cards[48];
   Texture2D cards_texture;
-  Hand player_hand, left_hand, right_hand;
+  Hand player_hand, left_hand, right_hand, deck;
 };
 
 void initialize_game(Game *g);