/*
 * This file is part of LanternServer, licensed under the MIT License (MIT).
 *
 * Copyright (c) LanternPowered <https://www.lanternpowered.org>
 * Copyright (c) SpongePowered <https://www.spongepowered.org>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the Software), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.lanternpowered.server.world.chunk;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

import com.google.common.base.MoreObjects;
import org.spongepowered.api.entity.Entity;

import java.util.Optional;
import java.util.UUID;

import javax.annotation.Nullable;

class LanternEntityLoadingTicket extends LanternLoadingTicket implements EntityChunkLoadingTicket {

    // The reference of the entity while it's not loaded yet,
    // this field will be cleared once the entity available is
    @Nullable private EntityReference entityReference;

    // The entity instance
    @Nullable private Entity entity;

    LanternEntityLoadingTicket(String plugin, LanternChunkManager chunkManager, int maxChunks, int numChunks) {
        super(plugin, chunkManager, maxChunks, numChunks);
    }

    LanternEntityLoadingTicket(String plugin, LanternChunkManager chunkManager, int maxChunks) {
        super(plugin, chunkManager, maxChunks);
    }

    @Override
    public void bindToEntity(Entity entity) {
        this.setEntity(checkNotNull(entity, "entity"));
    }

    @Override
    public Entity getBoundEntity() {
        synchronized (this.queue) {
            checkState(this.entity != null, "No entity bound to the ticket.");
            return this.entity;
        }
    }

    @Override
    public void setEntity(@Nullable Entity entity) {
        synchronized (this.queue) {
            this.entity = entity;
        }
    }

    @Override
    public Optional<Entity> getEntity() {
        synchronized (this.queue) {
            return Optional.ofNullable(this.entity);
        }
    }

    @Override
    public void setEntityReference(@Nullable EntityReference entityReference) {
        synchronized (this.queue) {
            this.entityReference = entityReference;
        }
    }

    @Override
    public Optional<EntityReference> getEntityReference() {
        synchronized (this.queue) {
            return Optional.ofNullable(this.entityReference);
        }
    }

    @Override
    public Optional<EntityReference> getOrCreateEntityReference() {
        synchronized (this.queue) {
            if (this.entity != null) {
                return Optional.of(new EntityReference(this.entity.getLocation().getChunkPosition().toVector2(true),
                        this.entity.getUniqueId()));
            }
            return Optional.ofNullable(this.entityReference);
        }
    }

    @Nullable
    UUID getEntityUniqueId() {
        synchronized (this.queue) {
            return this.entity != null ? this.entity.getUniqueId() : this.entityReference != null ? this.entityReference.getUniqueId() : null;
        }
    }

    @Override
    MoreObjects.ToStringHelper toStringHelper() {
        return super.toStringHelper().omitNullValues().add("entity", this.getEntityUniqueId());
    }
}