From 79cb8d5f9ef1a9f5e2aa1515d9e4813d3d5e2b38 Mon Sep 17 00:00:00 2001
From: Miloslav Macko <miloslav.macko@student.tuke.sk>
Date: Mon, 15 Apr 2024 22:31:53 +0200
Subject: [PATCH] 123

---
 a2/snake.c | 153 ++++++++++++++++-------------------------------------
 1 file changed, 46 insertions(+), 107 deletions(-)

diff --git a/a2/snake.c b/a2/snake.c
index 0850bba..0da9cca 100644
--- a/a2/snake.c
+++ b/a2/snake.c
@@ -1,118 +1,57 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <conio.h> 
+struct snake* add_snake(struct snake* old_head, int x, int y) {
+    struct snake* new_head = (struct snake*) malloc(sizeof(struct snake));
+    new_head->x = x;
+    new_head->y = y;
+    new_head->next = old_head;
+    return new_head;
+}
 
-#define WIDTH 20
-#define HEIGHT 20
-#define FOOD_COUNT 3
-
-enum EndGame { END_WALL, END_SNAKE, END_FOOD, END_CONTINUE };
-
-struct snake {
-    int x, y;
-    struct snake* next;
-};
-
-struct state {
-    int width, height;
-    int sx, sy; 
-    struct snake* snake;
-    int foodx[FOOD_COUNT];
-    int foody[FOOD_COUNT];
-};
-
-
-void initialize(struct state* state);
-void render(struct state* state);
-void handle_input(struct state* state);
-void game_loop(struct state* state);
-void cleanup(struct state* state);
-
-int main() {
-    struct state game_state;
-    initialize(&game_state);
-    game_loop(&game_state);
-    cleanup(&game_state);
+int is_snake(struct snake* snake, int x, int y) {
+    while (snake != NULL) {
+        if (snake->x == x && snake->y == y) {
+            return 1;
+        }
+        snake = snake->next;
+    }
     return 0;
 }
 
-void initialize(struct state* state) {
-    state->width = WIDTH;
-    state->height = HEIGHT;
-    state->sx = 1; 
-    state->sy = 0;
-    state->snake = add_snake(NULL, 5, 5); 
-    
+void free_snake(struct snake* snake) {
+    while (snake != NULL) {
+        struct snake* next = snake->next;
+        free(snake);
+        snake = next;
+    }
+}
+
+int step_state(struct state* state) {
+    int new_x = state->snake->x + state->sx;
+    int new_y = state->snake->y + state->sy;
+
+    if (new_x < 0 || new_x >= state->width || new_y < 0 || new_y >= state->height) {
+        return END_WALL;
+    }
+
+    if (is_snake(state->snake->next, new_x, new_y)) {
+        return END_SNAKE;
+    }
+
     for (int i = 0; i < FOOD_COUNT; i++) {
-        state->foodx[i] = rand() % state->width;
-        state->foody[i] = rand() % state->height;
-    }
-}
-
-void render(struct state* state) {
-    system("cls"); 
-    
-    for (int y = 0; y < state->height; y++) {
-        for (int x = 0; x < state->width; x++) {
-            if (is_snake(state->snake, x, y)) {
-                printf("* "); 
-            } else {
-                int food = 0;
-                for (int i = 0; i < FOOD_COUNT; i++) {
-                    if (state->foodx[i] == x && state->foody[i] == y) {
-                        printf("o "); 
-                        food = 1;
-                        break;
-                    }
-                }
-                if (!food) printf(". "); 
-            }
-        }
-        printf("\n");
-    }
-}
-
-void handle_input(struct state* state) {
-    if (_kbhit()) { 
-        char key = _getch(); 
-        switch (key) {
-            case 'w':
-                state->sx = 0; state->sy = -1; 
-                break;
-            case 's':
-                state->sx = 0; state->sy = 1; 
-                break;
-            case 'a':
-                state->sx = -1; state->sy = 0; 
-                break;
-            case 'd':
-                state->sx = 1; state->sy = 0; 
-                break;
-            case 'q':
-                exit(0); 
-                break;
-            default:
-                break;
+        if (state->foodx[i] == new_x && state->foody[i] == new_y) {
+            state->foodx[i] = -1;
+            state->foody[i] = -1;
+            state->snake = add_snake(state->snake, new_x, new_y);
+            return END_FOOD;
         }
     }
-}
 
-void game_loop(struct state* state) {
-    while (1) {
-        render(state);
-        handle_input(state);
-        int result = step_state(state);
-        if (result == END_WALL || result == END_SNAKE) {
-            printf("Game Over!\n");
-            break;
-        } else if (result == END_FOOD) {
-            printf("You ate all the food! You win!\n");
-            break;
-        }
-        
+    state->snake = add_snake(state->snake, new_x, new_y);
+    struct snake* tail = state->snake;
+    while (tail->next->next != NULL) {
+        tail = tail->next;
     }
-}
+    free(tail->next);
+    tail->next = NULL;
 
-void cleanup(struct state* state) {
-    free_snake(state->snake);
+    return END_CONTINUE;
 }