/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.tile;

import java.lang.ref.WeakReference;
import java.lang.reflect.Method;
import java.util.*;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import appeng.api.implementations.tiles.ISegmentedInventory;
import appeng.api.util.ICommonTile;
import appeng.api.util.IConfigManager;
import appeng.api.util.IConfigurableObject;
import appeng.api.util.IOrientable;
import appeng.core.AELog;
import appeng.core.features.IStackSrc;
import appeng.helpers.ICustomNameObject;
import appeng.helpers.IPriorityHost;
import appeng.tile.events.AETileEventHandler;
import appeng.tile.events.TileEventType;
import appeng.tile.inventory.AppEngInternalAEInventory;
import appeng.util.Platform;
import appeng.util.SettingsFrom;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.NetworkManager;
import net.minecraft.network.Packet;
import net.minecraft.network.play.server.S35PacketUpdateTileEntity;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;
import net.minecraftforge.common.util.ForgeDirection;

public class AEBaseTile
    extends TileEntity implements IOrientable, ICommonTile, ICustomNameObject {
    private static final ThreadLocal<WeakReference<AEBaseTile>> DROP_NO_ITEMS
        = new ThreadLocal<WeakReference<AEBaseTile>>();
    private static final
        Map<Class<? extends AEBaseTile>, Map<TileEventType, List<AETileEventHandler>>>
            HANDLERS = new HashMap<
                Class<? extends AEBaseTile>,
                Map<TileEventType, List<AETileEventHandler>>>();
    private static final Map<Class<? extends TileEntity>, IStackSrc> ITEM_STACKS
        = new HashMap<Class<? extends TileEntity>, IStackSrc>();
    private int renderFragment = 0;
    @Nullable
    private String customName;
    private ForgeDirection forward = ForgeDirection.UNKNOWN;
    private ForgeDirection up = ForgeDirection.UNKNOWN;

    public static void
    registerTileItem(final Class<? extends TileEntity> c, final IStackSrc wat) {
        ITEM_STACKS.put(c, wat);
    }

    public boolean dropItems() {
        final WeakReference<AEBaseTile> what = DROP_NO_ITEMS.get();
        return what == null || what.get() != this;
    }

    public boolean notLoaded() {
        return !this.worldObj.blockExists(this.xCoord, this.yCoord, this.zCoord);
    }

    @Nonnull
    public TileEntity getTile() {
        return this;
    }

    @Nullable
    protected ItemStack getItemFromTile(final Object obj) {
        final IStackSrc src = ITEM_STACKS.get(obj.getClass());
        if (src == null) {
            return null;
        }
        return src.stack(1);
    }

    /**
     * for dormant chunk cache.
     */
    public void onChunkLoad() {
        if (this.isInvalid()) {
            this.validate();
        }
    }

    @Override
    // NOTE: WAS FINAL, changed for Immibis
    public void readFromNBT(final NBTTagCompound data) {
        super.readFromNBT(data);

        if (data.hasKey("customName")) {
            this.customName = data.getString("customName");
        } else {
            this.customName = null;
        }

        try {
            if (this.canBeRotated()) {
                this.forward
                    = ForgeDirection.valueOf(data.getString("orientation_forward"));
                this.up = ForgeDirection.valueOf(data.getString("orientation_up"));
            }
        } catch (final IllegalArgumentException ignored) {}

        for (final AETileEventHandler h :
             this.getHandlerListFor(TileEventType.WORLD_NBT_READ)) {
            h.readFromNBT(this, data);
        }
    }

    @Override
    // NOTE: WAS FINAL, changed for Immibis
    public void writeToNBT(final NBTTagCompound data) {
        super.writeToNBT(data);

        if (this.canBeRotated()) {
            data.setString("orientation_forward", this.forward.name());
            data.setString("orientation_up", this.up.name());
        }

        if (this.customName != null) {
            data.setString("customName", this.customName);
        }

        for (final AETileEventHandler h :
             this.getHandlerListFor(TileEventType.WORLD_NBT_WRITE)) {
            h.writeToNBT(this, data);
        }
    }

    @Override
    public final void updateEntity() {
        for (final AETileEventHandler h : this.getHandlerListFor(TileEventType.TICK)) {
            h.tick(this);
        }
    }

    @Override
    public Packet getDescriptionPacket() {
        final NBTTagCompound data = new NBTTagCompound();

        final ByteBuf stream = Unpooled.buffer();

        try {
            this.writeToStream(stream);
            if (stream.readableBytes() == 0) {
                return null;
            }
        } catch (final Throwable t) {
            AELog.debug(t);
        }

        stream.capacity(stream.readableBytes());
        data.setByteArray("X", stream.array());
        return new S35PacketUpdateTileEntity(
            this.xCoord, this.yCoord, this.zCoord, 64, data
        );
    }

    @Override
    public final boolean canUpdate() {
        return this.hasHandlerFor(TileEventType.TICK);
    }

    private boolean hasHandlerFor(final TileEventType type) {
        final List<AETileEventHandler> list = this.getHandlerListFor(type);

        return !list.isEmpty();
    }

    @Override
    public void
    onDataPacket(final NetworkManager net, final S35PacketUpdateTileEntity pkt) {
        // / pkt.actionType
        if (pkt.func_148853_f() == 64) {
            final ByteBuf stream
                = Unpooled.copiedBuffer(pkt.func_148857_g().getByteArray("X"));
            if (this.readFromStream(stream)) {
                this.markForUpdate();
            }
        }
    }

    @Override
    public void onChunkUnload() {
        if (!this.isInvalid()) {
            this.invalidate();
        }
    }

    private final boolean readFromStream(final ByteBuf data) {
        boolean output = false;

        try {
            if (this.canBeRotated()) {
                final ForgeDirection old_Forward = this.forward;
                final ForgeDirection old_Up = this.up;

                final byte orientation = data.readByte();
                this.forward = ForgeDirection.getOrientation(orientation & 0x7);
                this.up = ForgeDirection.getOrientation(orientation >> 3);

                output = this.forward != old_Forward || this.up != old_Up;
            }

            this.renderFragment = 100;
            for (final AETileEventHandler h :
                 this.getHandlerListFor(TileEventType.NETWORK_READ)) {
                if (h.readFromStream(this, data)) {
                    output = true;
                }
            }

            if ((this.renderFragment & 1) == 1) {
                output = true;
            }
            this.renderFragment = 0;
        } catch (final Throwable t) {
            AELog.debug(t);
        }

        return output;
    }

    public void markForUpdate() {
        if (this.renderFragment > 0) {
            this.renderFragment |= 1;
        } else {
            // TODO: Optimize Network Load
            if (this.worldObj != null) {
                AELog.blockUpdate(this.xCoord, this.yCoord, this.zCoord, this);
                this.worldObj.markBlockForUpdate(this.xCoord, this.yCoord, this.zCoord);
            }
        }
    }

    private final void writeToStream(final ByteBuf data) {
        try {
            if (this.canBeRotated()) {
                final byte orientation
                    = (byte) ((this.up.ordinal() << 3) | this.forward.ordinal());
                data.writeByte(orientation);
            }

            for (final AETileEventHandler h :
                 this.getHandlerListFor(TileEventType.NETWORK_WRITE)) {
                h.writeToStream(this, data);
            }
        } catch (final Throwable t) {
            AELog.debug(t);
        }
    }

    /**
     * By default all blocks can have orientation, this handles saving, and loading, as
     * well as synchronization.
     *
     * @return true if tile can be rotated
     */
    @Override
    public boolean canBeRotated() {
        return true;
    }

    @Nonnull
    private List<AETileEventHandler> getHandlerListFor(final TileEventType type) {
        final Map<TileEventType, List<AETileEventHandler>> eventToHandlers
            = this.getEventToHandlers();
        final List<AETileEventHandler> handlers = this.getHandlers(eventToHandlers, type);

        return handlers;
    }

    @Nonnull
    private Map<TileEventType, List<AETileEventHandler>> getEventToHandlers() {
        final Class<? extends AEBaseTile> clazz = this.getClass();
        final Map<TileEventType, List<AETileEventHandler>> storedHandlers
            = HANDLERS.get(clazz);

        if (storedHandlers == null) {
            final Map<TileEventType, List<AETileEventHandler>> newStoredHandlers
                = new EnumMap<TileEventType, List<AETileEventHandler>>(TileEventType
                                                                           .class);

            HANDLERS.put(clazz, newStoredHandlers);

            for (final Method method : clazz.getMethods()) {
                final TileEvent event = method.getAnnotation(TileEvent.class);
                if (event != null) {
                    this.addHandler(newStoredHandlers, event.value(), method);
                }
            }

            return newStoredHandlers;
        } else {
            return storedHandlers;
        }
    }

    @Nonnull
    private List<AETileEventHandler> getHandlers(
        final Map<TileEventType, List<AETileEventHandler>> eventToHandlers,
        final TileEventType event
    ) {
        final List<AETileEventHandler> oldHandlers = eventToHandlers.get(event);

        if (oldHandlers == null) {
            final List<AETileEventHandler> newHandlers
                = new LinkedList<AETileEventHandler>();
            eventToHandlers.put(event, newHandlers);

            return newHandlers;
        } else {
            return oldHandlers;
        }
    }

    private void addHandler(
        final Map<TileEventType, List<AETileEventHandler>> handlerSet,
        final TileEventType value,
        final Method m
    ) {
        List<AETileEventHandler> list = handlerSet.get(value);

        if (list == null) {
            list = new ArrayList<AETileEventHandler>();
            handlerSet.put(value, list);
        }

        list.add(new AETileEventHandler(m));
    }

    @Override
    public ForgeDirection getForward() {
        return this.forward;
    }

    @Override
    public ForgeDirection getUp() {
        return this.up;
    }

    @Override
    public void
    setOrientation(final ForgeDirection inForward, final ForgeDirection inUp) {
        this.forward = inForward;
        this.up = inUp;
        this.markForUpdate();
        Platform.notifyBlocksOfNeighbors(
            this.worldObj, this.xCoord, this.yCoord, this.zCoord
        );
    }

    public void
    onPlacement(final ItemStack stack, final EntityPlayer player, final int side) {
        if (stack.hasTagCompound()) {
            this.uploadSettings(SettingsFrom.DISMANTLE_ITEM, stack.getTagCompound());
        }
    }

    /**
     * depending on the from, different settings will be accepted, don't call this with
     * null
     *
     * @param from     source of settings
     * @param compound compound of source
     */
    public void uploadSettings(final SettingsFrom from, final NBTTagCompound compound) {
        if (compound != null && this instanceof IConfigurableObject) {
            final IConfigManager cm = ((IConfigurableObject) this).getConfigManager();
            if (cm != null) {
                cm.readFromNBT(compound);
            }
        }

        if (this instanceof IPriorityHost) {
            final IPriorityHost pHost = (IPriorityHost) this;
            pHost.setPriority(compound.getInteger("priority"));
        }

        if (this instanceof ISegmentedInventory) {
            final IInventory inv
                = ((ISegmentedInventory) this).getInventoryByName("config");
            if (inv instanceof AppEngInternalAEInventory) {
                final AppEngInternalAEInventory target = (AppEngInternalAEInventory) inv;
                final AppEngInternalAEInventory tmp
                    = new AppEngInternalAEInventory(null, target.getSizeInventory());
                tmp.readFromNBT(compound, "config");
                for (int x = 0; x < tmp.getSizeInventory(); x++) {
                    target.setInventorySlotContents(x, tmp.getStackInSlot(x));
                }
            }
        }
    }

    /**
     * returns the contents of the tile entity, into the world, defaults to dropping
     * everything in the inventory.
     *
     * @param w     world
     * @param x     x pos of tile entity
     * @param y     y pos of tile entity
     * @param z     z pos of tile entity
     * @param drops drops of tile entity
     */
    @Override
    public void getDrops(
        final World w, final int x, final int y, final int z, final List<ItemStack> drops
    ) {
        if (this instanceof IInventory) {
            final IInventory inv = (IInventory) this;

            for (int l = 0; l < inv.getSizeInventory(); l++) {
                final ItemStack is = inv.getStackInSlot(l);
                if (is != null) {
                    drops.add(is);
                }
            }
        }
    }

    public void getNoDrops(
        final World w, final int x, final int y, final int z, final List<ItemStack> drops
    ) {}

    public void onReady() {}

    /**
     * null means nothing to store...
     *
     * @param from source of settings
     * @return compound of source
     */
    public NBTTagCompound downloadSettings(final SettingsFrom from) {
        final NBTTagCompound output = new NBTTagCompound();

        if (this.hasCustomName()) {
            final NBTTagCompound dsp = new NBTTagCompound();
            dsp.setString("Name", this.getCustomName());
            output.setTag("display", dsp);
        }

        if (this instanceof IConfigurableObject) {
            final IConfigManager cm = ((IConfigurableObject) this).getConfigManager();
            if (cm != null) {
                cm.writeToNBT(output);
            }
        }

        if (this instanceof IPriorityHost) {
            final IPriorityHost pHost = (IPriorityHost) this;
            output.setInteger("priority", pHost.getPriority());
        }

        if (this instanceof ISegmentedInventory) {
            final IInventory inv
                = ((ISegmentedInventory) this).getInventoryByName("config");
            if (inv instanceof AppEngInternalAEInventory) {
                ((AppEngInternalAEInventory) inv).writeToNBT(output, "config");
            }
        }

        return output.hasNoTags() ? null : output;
    }

    @Override
    public String getCustomName() {
        return this.hasCustomName() ? this.customName : this.getClass().getSimpleName();
    }

    @Override
    public boolean hasCustomName() {
        return this.customName != null && this.customName.length() > 0;
    }

    public void securityBreak() {
        this.worldObj.func_147480_a(this.xCoord, this.yCoord, this.zCoord, true);
        this.disableDrops();
    }

    public void disableDrops() {
        DROP_NO_ITEMS.set(new WeakReference<AEBaseTile>(this));
    }

    public void saveChanges() {
        super.markDirty();
    }

    public boolean requiresTESR() {
        return false;
    }

    public void setName(final String name) {
        this.customName = name;
    }
}