#include "include/raylib.h"
#include <stdio.h>


typedef struct Block {
    Vector2 position;
    int form, onGround;
    float speed;

    struct Block *next;
} Block;


void createBlock(Block **head) {
    Block *block = MemAlloc(sizeof(Block));
    block->position = (Vector2){ 400, -40 };
    block->form = 1;
    block->onGround = 0;
    block->speed = 2;
    block->next = NULL;

    // Falls die Liste leer ist
    if (*head == NULL) {
        *head = block;
        return;
    }

    // Durch alle Blöcke iterieren und den neuesten am Schluss hinzufügen
    Block *currentBlock = *head;
    while (currentBlock->next != NULL) {
        currentBlock = currentBlock->next;
    }

    currentBlock->next = block;
}


int main(void) {

    // INIT
    const int screenWidth = 800;
    const int screenHeight = 450;
    InitWindow(screenWidth, screenHeight, "Raylib Manuell");
    
    Block *block = { 0 };
    createBlock(&block);
    int blockMoving = 1;

    SetTargetFPS(60);

    while (!WindowShouldClose()) {
        // UPDATE GAME LOGIC
        Block *currentBlock = block;
        // Alle Blöcke fallen lassen
        while (currentBlock != NULL) {
            // Wenn Block noch nicht auf Boden, dann fallen
            if (currentBlock->onGround == 0) {
                
                Block *collisionBlock = block;
                while (collisionBlock != NULL) {
                    struct Rectangle rect1 = {currentBlock->position.x, currentBlock->position.y, 20, 20};
                    struct Rectangle rect2 = {collisionBlock->position.x, collisionBlock->position.y, 20, 20};

                    if (CheckCollisionRecs(rect1, rect2)) {
                        currentBlock->onGround = 1;
                        break;
                    }

                    if (currentBlock->position.y < screenHeight - 20) {
                        currentBlock->position.y += currentBlock->speed;
                    } else {
                        blockMoving = 0;
                        currentBlock->onGround = 1;
                    }

                    collisionBlock = collisionBlock->next;
                }



            }

            currentBlock = currentBlock->next;
        }

        // Wenn sich kein Block mehr bewegt, einen neuen erstellen
        if (blockMoving == 0) {
            createBlock(&block);
            blockMoving = 1;
        }

        // ZEICHNEN
        BeginDrawing();
            ClearBackground(RAYWHITE);
            
            DrawFPS(20, 20);

            currentBlock = block;
            while (currentBlock != NULL) {
                DrawRectangleV(currentBlock->position, (Vector2){20, 20}, BLUE);
                currentBlock = currentBlock->next;
            }

        EndDrawing();
    }


    CloseWindow();
    return 0;
}