MapPad Ads

AdSheet.java

package com.sk89q.mappad.apps;

import java.awt.Color;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.imageio.ImageIO;

import org.bukkit.entity.Player;
import org.bukkit.map.MapCanvas;
import org.bukkit.map.MapPalette;

import com.sk89q.mappad.AbstractApplication;
import com.sk89q.mappad.MapPad;
import com.sk89q.minecraft.util.commands.CommandContext;
import com.sk89q.minecraft.util.commands.CommandException;
import com.sk89q.rebar.util.MapCanvasUtil;

public class AdApp extends AbstractApplication {
	
	private static final Logger logger = Logger.getLogger(ImgurBrowser.class.getCanonicalName());
	private static AdManager manager = new AdManager();
	private int lastImageHash = -1;
	private boolean hasDrawn = false;
	private Random rand = new Random();
	
	public AdApp(MapPad mapPad, Player player) {
		super(mapPad, player);
	}

	public void draw(MapCanvas canvas) {
		int index = rand.nextInt(manager.getLength());
		Image image = manager.getImage(index);
        
        if (image == null && lastImageHash == -1 && !hasDrawn) {
        	MapCanvasUtil.clear(canvas, Color.BLACK);
        	MapCanvasUtil.drawText(canvas, 30, 50, "No ads loaded", MapPalette.LIGHT_GRAY);
    		MapCanvasUtil.drawText(canvas, 40, 58, "Use >help", MapPalette.LIGHT_GRAY);
    		MapCanvasUtil.drawText(canvas, 0, 120, "AdSheet 0.1 - TexasGamer", MapPalette.LIGHT_GRAY);
    		drawTitle(canvas,"AdSheet");
            lastImageHash = 0;
        } else if (image != null && image.hashCode() != lastImageHash && !hasDrawn) {
            MapCanvasUtil.clear(canvas, Color.WHITE);
            canvas.drawImage(0, TITLE_HEIGHT, image);
            lastImageHash = image.hashCode();
            String playerName = manager.getPlayerName(index);
            print("Advertisement purchased by " + playerName);
            
            // TODO: Deduct 1 credit from playerName
            print("** 1 credit deducted from " + playerName +"'s account **");
            
            drawTitle(canvas, "AdSheet");
            hasDrawn = true;
        }
	}

	public void accept(CommandContext context) throws CommandException {
		if (context.matches("help")) {
			print(">buy <imgur code> <credits> to purchase. Ads are displayed at random. Fees: 1 credit per view");
		}
		
		if (context.matches("buy")) {
			if (context.argsLength() < 2) {
                throw new CommandException("Imgur ID and credit amount required");
            }
			
			String id = context.getString(0);
            if (!id.matches("^[A-Za-z0-9\\-]+$")) {
                throw new CommandException("Invalid Imgur ID " + id + " entered");
            }
            
            if (manager.request(id, getPlayer())) {
                MapPad.print(getPlayer(), "Loading " + id + "...");
            } else {
                throw new CommandException("Please wait a few seconds and try again.");
            }
		}
		
	}

	public void quit() {
		// TODO Auto-generated method stub
		hasDrawn = false;
	}
	
    private static class AdManager {
        
        private boolean busy = false;
        private long lastSuccessfulRequest = 0;
        private int lastImageIndex = -1;
        private Image[] image = new Image[5];		// # of ads to store
        private String[] playerName = new String[5];	// # of ads to store
        
        public boolean request(String id, Player player) {
            synchronized(this) {
                if (busy || (System.currentTimeMillis() - lastSuccessfulRequest < 2000)) {
                    return false;
                } else {
                    busy = true;
                }
            }
            
            Thread thread = new Thread(new AdFetcher(this, id, player));
            thread.start();
            
            return true;
        }

        public Image getImage(int index) {
            return image[index];
        }

        public String getPlayerName(int index) {
            return playerName[index];
        }
        
        public int getLength(){
        	return image.length;
        }

        public void failRequest() {
            synchronized(this) {
                busy = false;
            }
        }

        public void setImage(Image newImage, Player player) {
            synchronized(this) {
                busy = false;
                lastSuccessfulRequest = System.currentTimeMillis();
            }
            lastImageIndex++;
            image[lastImageIndex] = newImage;
            playerName[lastImageIndex] = player.getName();
        }
    }
    
    private static class AdFetcher implements Runnable {
        
        private String id;
        private AdManager manager;
        private Player player;
        
        public AdFetcher(AdManager manager, String id, Player player) {
            this.manager = manager;
            this.id = id;
            this.player = player;
        }
        
        public void run() {
            try {
                URL url = new URL("http://i.imgur.com/" + id + ".png");
                logger.info("AdSheet: Loading " + url.toString() + " for " + player.getName());
                URLConnection conn = url.openConnection();
                conn.setConnectTimeout(2000);
                conn.setReadTimeout(10000);
                BufferedImage image = ImageIO.read(conn.getInputStream());
                manager.setImage(image.getScaledInstance(128, 128 - TITLE_HEIGHT, BufferedImage.SCALE_FAST), player);
                logger.info("AdSheet: Loaded " + url.toString() + " successfully");
            } catch (FileNotFoundException e) {
                logger.log(Level.WARNING, "ImgurBrowser: Failed to load image from Imgur", e);
                MapPad.print(player, "Image " + id + " was not found on Imgur.com");
                manager.failRequest();
            } catch (IOException e) {
                logger.log(Level.WARNING, "ImgurBrowser: Failed to load image from Imgur", e);
                MapPad.print(player, "Image " + id + " could not load: " + e.getMessage());
                manager.failRequest();
            }
        }
        
    }

}