package net.minecraft.launcher.ui;

import net.minecraft.launcher.Launcher;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.geom.Point2D;
import java.io.IOException;

public class TexturedPanel extends JPanel {
    private static final long serialVersionUID = 1L;
    private Image image;
    private Image bgImage;

    public TexturedPanel(String filename) {
        setOpaque(true);
        try {
            this.bgImage = ImageIO.read(TexturedPanel.class.getResource(filename)).getScaledInstance(32, 32, 16);
        } catch (IOException e) {
            Launcher.getInstance().println("Unexpected exception initializing textured panel", e);
        }
    }

    public void update(Graphics g) {
        paint(g);
    }

    public void paintComponent(Graphics graphics) {
        int width = getWidth() / 2 + 1;
        int height = getHeight() / 2 + 1;

        if ((this.image == null) || (this.image.getWidth(null) != width) || (this.image.getHeight(null) != height)) {
            this.image = createImage(width, height);
            copyImage(width, height);
        }

        graphics.drawImage(this.image, 0, 0, width * 2, height * 2, null);
    }

    protected void copyImage(int width, int height) {
        Graphics imageGraphics = this.image.getGraphics();

        for (int x = 0; x <= width / 32; x++) {
            for (int y = 0; y <= height / 32; y++) {
                imageGraphics.drawImage(this.bgImage, x * 32, y * 32, null);
            }
        }

        if ((imageGraphics instanceof Graphics2D)) {
            overlayGradient(width, height, (Graphics2D) imageGraphics);
        }

        imageGraphics.dispose();
    }

    protected void overlayGradient(int width, int height, Graphics2D graphics) {
        int gh = 1;
        graphics.setPaint(new GradientPaint(new Point2D.Float(0.0F, 0.0F), new Color(553648127, true), new Point2D.Float(0.0F, gh), new Color(0, true)));
        graphics.fillRect(0, 0, width, gh);

        gh = height;
        graphics.setPaint(new GradientPaint(new Point2D.Float(0.0F, 0.0F), new Color(0, true), new Point2D.Float(0.0F, gh), new Color(1610612736, true)));
        graphics.fillRect(0, 0, width, gh);
    }
}