package com.snake.gui;

import com.snake.logic.Snake;
import com.snake.logic.TilePosition;
import com.snake.logic.World;

public class Renderer {

    private final int widthpixel;
    private final World world;
    private final int heightpixel;
    private int tileSize;

    public Renderer(World world, int tileSize) {

        this.world = world;
        this.tileSize = tileSize;
        this.heightpixel = tileSize * (world.getHeight() + 2);
        this.widthpixel = tileSize * (world.getWidth() + 2);

    }

    public void render(World world, int[] pixels, int width, int height) {

        renderBackground(this.world.getWidth(), this.world.getHeight(), pixels);
        renderSnake(this.world.getSnake(), pixels);
        renderApple(this.world.getApple(), pixels);

    }

    public void draw(int tileX, int tileY, int[] pixels, int r, int g, int b) {
        for (int dx = 0; dx < tileSize; dx++) {
            for (int dy = 0; dy < tileSize; dy++) {
                int pixelX = tileX * tileSize + dx;
                int pixelY = tileY * tileSize + dy;
                pixels[pixelY * widthpixel + pixelX] = color(r, g, b);
            }
        }
    }

    public void renderBackground(int width, int height, int[] pixels) {
        for (int i = 0; i < width; i++) {
            draw(i, 0, pixels, 178,34,34);
        }
        for (int i = 0; i < height; i++) {
            draw(0, i, pixels, 178,34,34);
        }
        for (int i = 0; i < width; i++) {
            draw(i, width - 1, pixels, 178,34,34);
        }
        for (int i = 0; i < height; i++) {
            draw(height - 1, i, pixels, 178,34,34);
        }
    }

    public void renderSnake(Snake snake, int[] pixels) {
        TilePosition head = snake.snakeParts.peekFirst();
        draw(head.x, head.y, pixels, 0, 191, 255);
        for (int i = 1; i < snake.snakeParts.size(); i++) {
            draw(snake.snakeParts.get(i).x, snake.snakeParts.get(i).y, pixels, 0, 205, 102);
        }
    }

    public void renderApple(TilePosition apple, int[] pixels) {
        draw(apple.x, apple.y, pixels, 139, 101, 8);
    }

    private static int color(int r, int g, int b) {
        return color(r, g, b, 255);
    }

    private static int color(int r, int g, int b, int a) {
        return (a << 24) | (r << 16) | (g << 8) | b;
    }

}