package com.company;

import org.jetbrains.annotations.NotNull;

import javax.swing.*;
import java.awt.*;
import java.awt.image.CropImageFilter;
import java.awt.image.FilteredImageSource;
import java.util.ArrayList;

public class Panel extends JPanel {

    private final ArrayList<Image> tileset;
    private final Integer[] data;

    private @NotNull Image createCroppedImage(@NotNull ImageIcon image, int x, int y, int width, int height) {

        FilteredImageSource croppedImage = new FilteredImageSource(
                image.getImage().getSource(),
                new CropImageFilter(x, y, width, height)
        );

        return createImage(croppedImage);

    }

    private ArrayList<Image> loadTileset(String filepath, int tileWidth, int tileHeight) {

        if (filepath == null) {

            return null;

        }

        ArrayList<Image> images = new ArrayList<>();
        images.add(createImage(tileWidth, tileHeight));

        ImageIcon tileset = new ImageIcon(filepath);
        if (tileset.getImage() == null) {

            return null;

        }

        int tilesX = tileset.getIconWidth() / tileWidth;
        int tilesY = tileset.getIconHeight() / tileHeight;

        for (int i = 0; i < tilesX * tilesY; ++i) {

            images.add(this.createCroppedImage(tileset, tileWidth * (i % tilesX), tileHeight * (i / tilesX), tileWidth, tileHeight));

        }

        return images;

    }

    public Panel() {

        this.data = new Integer[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 0, 0, 0, 0, 0, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 0, 0, 0, 0, 0, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 0, 0, 5, 6, 7, 0, 0, 12, 0, 1, 2, 2, 2, 2, 3, 0, 0, 5, 6, 7, 0, 0, 9, 10, 11, 0, 0, 12, 0, 5, 6, 6, 6, 6, 7, 0, 0, 9, 10, 11, 0, 0, 13, 14, 15, 0, 0, 12, 0, 9, 10, 10, 10, 10, 11, 0, 0, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 12, 0, 9, 10, 10, 10, 10, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 0, 9, 10, 10, 10, 10, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 9, 10, 10, 10, 10, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

        int tileWidth  = 32;
        int tileHeight = 32;

        this.tileset = this.loadTileset("resources/tileset.png", tileWidth, tileHeight);

    }

    @Override
    protected void paintComponent(Graphics g) {

        super.paintComponent(g);

        g.drawImage(this.tileset.get(19), 0, 0, 100, 100, this);

    }
}