From 016b1eafb5fee5e7d0c2a68bc1edb7451c9fc1da Mon Sep 17 00:00:00 2001
From: Piotr Kozak <piotr5kozak@gmail.com>
Date: Fri, 6 Mar 2026 19:03:55 +0100
Subject: [PATCH] Game state is now preserved in a file

---
 .gitignore |  1 +
 game.c     |  5 +++++
 game.h     |  7 ++++---
 main.c     |  8 ++++++++
 ui.c       | 12 +++++++++---
 5 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/.gitignore b/.gitignore
index ba2906d..8fbd6e6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 main
+save.dat
diff --git a/game.c b/game.c
index 55d4ac6..5c95a86 100644
--- a/game.c
+++ b/game.c
@@ -176,6 +176,11 @@ void reset_board(GameState_t *state) {
     state->board[y][x] = (rand() % 10 == 0) ? 4 : 2; // 10% chance to spawn a 4
     tile_count++;
   }
+  FILE *f = fopen("save.dat", "wb");
+  if (f) {
+    fwrite(state, sizeof(GameState_t), 1, f);
+    fclose(f);
+  }
 }
 
 bool spawn_tile(GameState_t *state) {
diff --git a/game.h b/game.h
index 41fffcf..88ce570 100644
--- a/game.h
+++ b/game.h
@@ -1,5 +1,6 @@
 #pragma once
 #include <raylib.h>
+#include <stdio.h>
 
 #define BOARD_WIDTH 4
 #define BOARD_HEIGHT 4
@@ -9,10 +10,10 @@ typedef enum { UP, DOWN, LEFT, RIGHT } move_direction_t;
 typedef enum { PLAYING, WON, LOST } game_status_t;
 
 typedef struct {
-  int board[BOARD_HEIGHT][BOARD_WIDTH];
+  unsigned int board[BOARD_HEIGHT][BOARD_WIDTH];
   game_status_t status;
-  int score;
-  int moves_made;
+  unsigned int score;
+  unsigned int moves_made;
 } GameState_t;
 
 void move(GameState_t *state, move_direction_t direction);
diff --git a/main.c b/main.c
index ad946f1..d133fcf 100644
--- a/main.c
+++ b/main.c
@@ -1,6 +1,7 @@
 #include "raylib.h"
 #include <math.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
 
@@ -30,6 +31,13 @@ int main() {
   srand(time(NULL));
 
   reset_board(&game_state);
+  FILE* game_file = fopen("save.dat", "rb");
+  if (game_file != NULL) {
+    fseek(game_file, 0, SEEK_SET);
+    fread(&game_state, sizeof(GameState_t), 1, game_file);
+    fclose(game_file);
+  }
+
   InitWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "2048");
   SetTargetFPS(30); // So my laptop doesn't burn
 
diff --git a/ui.c b/ui.c
index 0b2a6f5..006fb88 100644
--- a/ui.c
+++ b/ui.c
@@ -3,6 +3,7 @@
 #include <math.h>
 #include <raylib.h>
 #include <stdbool.h>
+#include <stdio.h>
 
 static bool is_dragging;
 static Vector2 drag_start_pos;
@@ -55,15 +56,20 @@ void handle_mouse_input(GameState_t *game_state) {
         return;
       }
       // TODO: Allow for infinite play
-      for(int y = 0; y < BOARD_HEIGHT; y++) {
-        for(int x = 0; x < BOARD_WIDTH; x++) {
-          if(game_state->board[y][x] == 2048) {
+      for (int y = 0; y < BOARD_HEIGHT; y++) {
+        for (int x = 0; x < BOARD_WIDTH; x++) {
+          if (game_state->board[y][x] == 2048) {
             game_state->status = WON;
             return;
           }
         }
       }
 
+      FILE *f = fopen("save.dat", "wb");
+      if (f) {
+        fwrite(game_state, sizeof(GameState_t), 1, f);
+        fclose(f);
+      }
     }
 
     is_dragging = false;