From 304844b7e1e9cb7cef916c8f7cebb09e951ead9a Mon Sep 17 00:00:00 2001
From: Miloslav Macko <miloslav.macko@student.tuke.sk>
Date: Wed, 10 Apr 2024 23:20:20 +0200
Subject: [PATCH] 1111

---
 cv9/snake.c | 75 +++++++++++++++++++----------------------------------
 1 file changed, 26 insertions(+), 49 deletions(-)

diff --git a/cv9/snake.c b/cv9/snake.c
index cad3b4c..0c66745 100644
--- a/cv9/snake.c
+++ b/cv9/snake.c
@@ -2,11 +2,7 @@
 #include <stdlib.h>
 
 struct snake* add_snake(struct snake* snake, int x, int y) {
-    struct snake* new_head = (struct snake*)malloc(sizeof(struct snake));
-    if (!new_head) {
-        // Memory allocation failed
-        return NULL;
-    }
+    struct snake* new_head = (struct snake*) malloc(sizeof(struct snake));
     new_head->x = x;
     new_head->y = y;
     new_head->next = snake;
@@ -14,81 +10,62 @@ struct snake* add_snake(struct snake* snake, int x, int y) {
 }
 
 struct snake* remove_snake(struct snake* snake) {
-    if (!snake) {
-        // Snake is empty
-        return NULL;
+    struct snake* temp = snake;
+    while(temp->next->next != NULL) {
+        temp = temp->next;
     }
-    struct snake* next_part = snake->next;
-    free(snake);
-    return next_part;
+    free(temp->next);
+    temp->next = NULL;
+    return snake;
 }
 
-
-
-
 int is_snake(struct snake* snake, int x, int y) {
-    while (snake) {
-        if (snake->x == x && snake->y == y) {
-            return 1; // Found snake part at given coordinates
+    while(snake != NULL) {
+        if(snake->x == x && snake->y == y) {
+            return 1;
         }
         snake = snake->next;
     }
-    return 0; // Snake part not found
+    return 0;
 }
 
-void free_snake(struct snake* sn) {
-    while (sn) {
-        struct snake* temp = sn;
-        sn = sn->next;
+void free_snake(struct snake* snake) {
+    struct snake* temp;
+    while(snake != NULL) {
+        temp = snake;
+        snake = snake->next;
         free(temp);
     }
 }
 
 int step_state(struct state* state) {
-    // Calculate new position of the snake head
     int new_x = state->snake->x + state->sx;
     int new_y = state->snake->y + state->sy;
 
-    // Check if snake hits a wall
-    if (new_x < 0 || new_x >= state->width || new_y < 0 || new_y >= state->height) {
+    if(new_x < 0 || new_x >= state->width || new_y < 0 || new_y >= state->height) {
         return END_WALL;
     }
 
-    // Check if snake hits itself
-    if (is_snake(state->snake->next, new_x, new_y)) {
+    if(is_snake(state->snake, new_x, new_y)) {
         return END_SNAKE;
     }
 
-    // Check if snake eats food
-    int i;
-    for (i = 0; i < FOOD_COUNT; i++) {
-        if (state->foodx[i] == new_x && state->foody[i] == new_y) {
-            // Food eaten, mark it as negative
+    for(int i = 0; i < FOOD_COUNT; i++) {
+        if(state->foodx[i] == new_x && state->foody[i] == new_y) {
             state->foodx[i] = -1;
             state->foody[i] = -1;
-            // Add new snake part at the food position
             state->snake = add_snake(state->snake, new_x, new_y);
-            if (state->snake == NULL) {
-                // Memory allocation failed
-                return END_USER;
-            }
-            // Check if no food left
-            int food_left = 0;
-            for (int j = 0; j < FOOD_COUNT; j++) {
-                if (state->foodx[j] >= 0 && state->foody[j] >= 0) {
-                    food_left = 1;
-                    break;
+            for(int j = 0; j < FOOD_COUNT; j++) {
+                if(state->foodx[j] != -1) {
+                    return END_CONTINUE;
                 }
             }
-            if (!food_left) {
-                return END_FOOD; // No food left
-            }
-            return END_CONTINUE; // Food eaten, continue the game
+            return END_FOOD;
         }
     }
 
-    // Add new snake part on the new position and remove the last part of the snake
     state->snake = add_snake(state->snake, new_x, new_y);
-    state->snake = remove_snake(state->snake->next);
+    state->snake = remove_snake(state->snake);
+
     return END_CONTINUE;
 }