package rs.controller;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.FileImageInputStream;
import javax.imageio.stream.ImageInputStream;

public class WorldMap {

	public BufferedImage world_map;
	public int x = 2150, y = 1300, zoom = 1;
	private FileImageInputStream is;
	private ImageReader imageReader;
	private ImageReadParam readParameters;
	private int previousX;
	private int previousY;
	
    public void mousePressed(MouseEvent e) {
    	previousX = e.getX();
        previousY = e.getY();
    }
    
    public void mouseClicked(MouseEvent e) {
    	if(e.getClickCount() == 2) 
	        zoom = (zoom == 1) ? 2 : 1;
    }

    public void mouseDragged(MouseEvent e) {
    	int xx = e.getX();
        int yy = e.getY();

        if(e.getX() < previousX) {
            if(x + (previousX - xx)/zoom < 3967)
        	x += (previousX - xx)/zoom;
        } else if(xx > previousX) {
            if(x - (xx - previousX)/zoom > 0)
        	x -= (xx - previousX)/zoom;
        }
        
        if (yy < previousY) {
            if(y + (previousY - yy)/zoom < 3583)
            	y += (previousY - yy)/zoom;
        } else if (yy > previousY) {
            if(y - (yy - previousY)/zoom > 0)
        	y -= (yy - previousY)/zoom;
        }

       	world_map = loadFrame(x, y, 770, 535);
        previousX = xx;
        previousY = yy;
    }
	
	public WorldMap() {
		try {
			ImageInputStream is = ImageIO.createImageInputStream(getClass().getResourceAsStream("/worldmap.jpg"));
			imageReader = ImageIO.getImageReaders(is).next();
			imageReader.setInput(is, false, true);
			readParameters = imageReader.getDefaultReadParam();
			world_map = loadFrame(x, y, 770, 535);
		} catch(Exception e) {
			e.printStackTrace();
		}
	}
	
	private BufferedImage loadFrame(int x, int y, int w, int h) {
	    readParameters.setSourceRegion(new Rectangle(x, y, w, h));
	    try {
	        return imageReader.read(0, readParameters);
	    } catch (IOException ex) {
	        return null;
	    }
	}
	
	public void render(Graphics g) {
		g.setColor(Color.black);
		g.drawImage(world_map, 0, 0, 770 * zoom, 535 * zoom, null);
	}
	
}