InventoryListener

package tk.blackwolf12333.grieflog.listeners;

import java.util.ArrayList;
import java.util.HashMap;

import org.bukkit.Material;
import org.bukkit.block.Chest;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.inventory.InventoryCloseEvent;
import org.bukkit.event.inventory.InventoryOpenEvent;
import org.bukkit.event.inventory.InventoryType;
import org.bukkit.inventory.InventoryView;
import org.bukkit.inventory.ItemStack;

import tk.blackwolf12333.grieflog.GriefLog;
import tk.blackwolf12333.grieflog.data.player.InventoryTransactionData;
import tk.blackwolf12333.grieflog.utils.InventoryStringDeSerializer;

public class InventoryListener implements Listener {

    GriefLog plugin;
    HashMap<String, InventoryView> inventories = new HashMap<String, InventoryView>();

    public InventoryListener(GriefLog plugin) {
        this.plugin = plugin;
    }

    @EventHandler
    public void onInventoryOpen(InventoryOpenEvent event) {
        inventories.put(event.getPlayer().getName(), event.getView());
    }

    @EventHandler
    public void onInventoryClose(InventoryCloseEvent event) {
        if(event.getInventory().getType() == InventoryType.CHEST) {
            Chest chest = (Chest) event.getInventory().getHolder();
            Integer chestX = chest.getX();
            Integer chestY = chest.getY();
            Integer chestZ = chest.getZ();
            String chestWorld = chest.getWorld().getName();
            String player = event.getPlayer().getName();
            String result = calculateInventoryDifference(event.getView(), event.getPlayer().getName());
            GriefLog.debug("Transaction by: " + player + " with " + result);
            new InventoryTransactionData(player, chestX, chestY, chestZ, chestWorld, result).log();
        }
        inventories.remove(event.getPlayer().getName());
    }

    private String calculateInventoryDifference(InventoryView currentView, String name) {
        ArrayList<ItemStack> taken = new ArrayList<ItemStack>();
        ArrayList<ItemStack> put = new ArrayList<ItemStack>();
        InventoryView oldView = inventories.get(name);
        for(int i = 0; i < currentView.getTopInventory().getSize(); i++) {
            if((oldView.getItem(i).getTypeId() != currentView.getItem(i).getTypeId()) && (oldView.getItem(i).getAmount() != currentView.getItem(i).getAmount())) {
                GriefLog.debug("new item != old item\n");
                taken.add(oldView.getItem(i));
            } else {
                if((oldView.getItem(i).getType() == Material.AIR) && (currentView.getItem(i).getType() != Material.AIR)) {
                    put.add(currentView.getItem(i));
                }
            }
        }

        return getDifferenceResultInString(taken, put);
    }

    private String getDifferenceResultInString(ArrayList<ItemStack> taken, ArrayList<ItemStack> put) {
        String takenStr = new String("Taken: ");
        String putStr = new String("Put: ");

        for(ItemStack i : taken) {
            takenStr += taken.indexOf(i) + "#" + InventoryStringDeSerializer.itemToString(i) + ";";
        }
        for(ItemStack i : put) {
            putStr += put.indexOf(i) + "#" + InventoryStringDeSerializer.itemToString(i) + ";";
        }

        return takenStr + " " + putStr;
    }
}