/home/leaf/crossfire/jxclient/trunk/model/src/main/java/com/realtime/crossfire/jxclient/items/ItemSet.java

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/*
 * This file is part of JXClient, the Fullscreen Java Crossfire Client.
 *
 * JXClient is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * JXClient is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JXClient; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Copyright (C) 2005-2008 Yann Chachkoff.
 * Copyright (C) 2006-2011 Andreas Kirschbaum.
 */

package com.realtime.crossfire.jxclient.items;

import com.realtime.crossfire.jxclient.faces.Face;
import com.realtime.crossfire.jxclient.server.crossfire.messages.UpdItem;
import com.realtime.crossfire.jxclient.util.EventListenerList2;
import com.realtime.crossfire.jxclient.util.HashedEventListenerList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class ItemSet {

    @NotNull
    private final Map<Integer, CfItem> allItems = new HashMap<Integer, CfItem>();

    @NotNull
    private final Map<Integer, List<CfItem>> items = new HashMap<Integer, List<CfItem>>();

    @NotNull
    private final Object sync = new Object();

    @Nullable
    private CfItem player = null;

    private int openContainerFloor = 0;

    @NotNull
    private final EventListenerList2<ItemSetListener> itemSetListeners = new EventListenerList2<ItemSetListener>(ItemSetListener.class);

    @NotNull
    private final HashedEventListenerList<ItemListener> itemListeners = new HashedEventListenerList<ItemListener>(ItemListener.class);

    public void addItemSetListener(@NotNull final ItemSetListener listener) {
        itemSetListeners.add(listener);
    }

    public void removeItemSetListener(@NotNull final ItemSetListener listener) {
        itemSetListeners.remove(listener);
    }

    public void addInventoryListener(final int tag, @NotNull final ItemListener listener) {
        itemListeners.add(tag, listener);
    }

    public void removeInventoryListener(final int tag, @NotNull final ItemListener listener) {
        itemListeners.remove(tag, listener);
    }

    @NotNull
    public List<CfItem> getItemsByLocation(final int location) {
        final List<CfItem> result = items.get(location);
        if (result == null) {
            return Collections.emptyList();
        }
        return Collections.unmodifiableList(result);
    }

    public int getNumberOfItemsByLocation(final int location) {
        final Collection<CfItem> result = items.get(location);
        return result == null ? 0 : result.size();
    }

    private int removeItemByTag(final int tag, final boolean notifyListeners) {
        synchronized (sync) {
            final CfItem item = allItems.remove(tag);
            if (item == null) {
                return -1;
            }

            for (final ItemSetListener listener : itemSetListeners.getListeners()) {
                listener.itemRemoved(item);
            }

            final int where = item.getLocation();
            final List<CfItem> list = items.get(where);
            if (list == null) {
                throw new AssertionError("cannot find item "+item.getTag());
            }

            final int index = list.indexOf(item);
            if (list.remove(index) == null) {
                throw new AssertionError("cannot find item "+item.getTag());
            }

            if (list.isEmpty() && items.remove(item.getLocation()) != list) {
                throw new AssertionError();
            }

            for (final ItemListener itemListener : itemListeners.getListeners(where)) {
                itemListener.inventoryRemoved(where, index);
            }

            if (notifyListeners) {
                for (final ItemSetListener listener : itemSetListeners.getListeners()) {
                    listener.itemRemoved(item);
                }
            }

            for (final ItemListener itemListener : itemListeners.getListeners(tag)) {
                itemListener.itemRemoved(tag);
            }

            return index;
        }
    }

    public void removeItems(@NotNull final int[] tags) {
        for (final int tag : tags) {
            if (removeItemByTag(tag, true) == -1) {
                System.err.println("removeItem3: item "+tag+" does not exist");
            }
        }
    }

    public void addItem(@NotNull final CfItem item) {
        addItem(item, true);
    }

    private void addItem(@NotNull final CfItem item, final boolean notifyListeners) {
        removeItemByTag(item.getTag(), true);

        if (allItems.put(item.getTag(), item) != null) {
            throw new AssertionError("duplicate item "+item.getTag());
        }

        final int where = item.getLocation();
        List<CfItem> list = items.get(where);
        if (list == null) {
            list = new CopyOnWriteArrayList<CfItem>();
            if (items.put(where, list) != null) {
                throw new AssertionError();
            }
        }

        list.add(item);

        if (notifyListeners) {
            for (final ItemSetListener listener : itemSetListeners.getListeners()) {
                listener.itemAdded(item);
            }
        }

        for (final ItemListener itemListener : itemListeners.getListeners(where)) {
            itemListener.inventoryAdded(where, list.size()-1, item);
        }
    }

    @NotNull
    private List<CfItem> getInventoryByTag(final int tag) {
        final List<CfItem> inventory = items.get(tag);
        if (inventory == null) {
            return Collections.emptyList();
        }
        return Collections.unmodifiableList(inventory);
    }

    @Nullable
    public CfItem getItemByTag(final int tag) {
        return allItems.get(tag);
    }

    @Nullable
    public CfItem getPlayer() {
        synchronized (sync) {
            return player;
        }
    }

    public void setPlayer(@Nullable final CfItem player) {
        synchronized (sync) {
            if (this.player == player) {
                return;
            }

            this.player = player;
            for (final ItemSetListener listener : itemSetListeners.getListeners()) {
                listener.playerChanged(player);
            }
        }
    }

    @NotNull
    public Iterable<CfItem> getPlayerInventory() {
        synchronized (sync) {
            return player == null ? Collections.<CfItem>emptyList() : getInventoryByTag(player.getTag());
        }
    }

    @Nullable
    private CfItem getItemOrPlayer(final int tag) {
        synchronized (sync) {
            if (player != null && player.getTag() == tag) {
                return player;
            }

            return allItems.get(tag);
        }
    }

    public void cleanInventory(final int tag) {
        final List<CfItem> inventoryItems = getItemsByLocation(tag);
        final ListIterator<CfItem> it = inventoryItems.listIterator(inventoryItems.size());
        while (it.hasPrevious()) {
            final CfItem item = it.previous();
            removeItemByTag(item.getTag(), true);
        }
    }

    public void updateItem(final int flags, final int tag, final int valLocation, final int valFlags, final int valWeight, final Face valFace, @NotNull final String valName, @NotNull final String valNamePl, final int valAnim, final int valAnimSpeed, final int valNrof) {
        synchronized (sync) {
            final CfItem item = getItemOrPlayer(tag);
            if (item == null) {
                if (flags != UpdItem.UPD_FACE) { // XXX: suppress frequent error message due to server bug
                    System.err.println("updateItem: undefined item "+tag);
                }
                return;
            }

            final boolean wasOpen = (flags&UpdItem.UPD_FLAGS) != 0 && openContainerFloor == item.getTag() && item.isOpen();
            item.update(flags, valFlags, valWeight, valFace, valName, valNamePl, valAnim, valAnimSpeed, valNrof);
            if ((flags&UpdItem.UPD_LOCATION) != 0 && item.getLocation() != valLocation) {
                removeItemByTag(item.getTag(), false);
                item.setLocation(valLocation);
                addItem(item, false);

                for (final ItemSetListener listener : itemSetListeners.getListeners()) {
                    listener.itemMoved(item);
                }
            }
            if ((flags&~UpdItem.UPD_LOCATION) != 0) {
                for (final ItemSetListener listener : itemSetListeners.getListeners()) {
                    listener.itemChanged(item);
                }
                for (final ItemListener itemListener : itemListeners.getListeners(tag)) {
                    itemListener.itemChanged(tag);
                }
            }
            if ((flags&UpdItem.UPD_FLAGS) != 0) {
                if (item.isOpen()) {
                    setOpenContainer(item.getTag());
                } else if (wasOpen) {
                    setOpenContainer(0);
                }
            }
        }
    }

    public void reset() {
        synchronized (sync) {
            if (player != null) {
                cleanInventory(player.getTag());
            }
            final Iterable<CfItem> tmp = new HashSet<CfItem>(allItems.values());
            for (final CfItem item : tmp) {
                removeItemByTag(item.getTag(), true);
            }
            setOpenContainer(0);
            setPlayer(null);
        }
    }

    private void setOpenContainer(final int openContainerFloor) {
        if (this.openContainerFloor == openContainerFloor) {
            return;
        }

        this.openContainerFloor = openContainerFloor;
        for (final ItemSetListener listener : itemSetListeners.getListeners()) {
            listener.openContainerChanged(openContainerFloor);
        }
    }

    public int getOpenContainer() {
        return openContainerFloor;
    }

    @Nullable
    public CfItem getInventoryItem(final int tag, final int index) {
        final List<CfItem> inventoryItems = getInventoryByTag(tag);
        try {
            return 0 <= index && index < inventoryItems.size() ? inventoryItems.get(index) : null;
        } catch (final ArrayIndexOutOfBoundsException ignored) {
            return null;
        }
    }

}

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