/*
 * Copyright 2008-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.broadleafcommerce.core.order.domain;

import org.broadleafcommerce.common.currency.util.BroadleafCurrencyUtils;
import org.broadleafcommerce.common.money.Money;
import org.broadleafcommerce.common.presentation.AdminPresentation;
import org.broadleafcommerce.common.presentation.AdminPresentationClass;
import org.broadleafcommerce.common.presentation.client.SupportedFieldType;
import org.broadleafcommerce.common.presentation.override.AdminPresentationOverride;
import org.broadleafcommerce.common.presentation.override.AdminPresentationOverrides;
import org.broadleafcommerce.core.catalog.domain.Product;
import org.broadleafcommerce.core.catalog.domain.ProductImpl;
import org.broadleafcommerce.core.catalog.domain.Sku;
import org.broadleafcommerce.core.catalog.domain.SkuBundleItem;
import org.broadleafcommerce.core.catalog.domain.SkuBundleItemImpl;
import org.broadleafcommerce.core.catalog.domain.SkuImpl;
import org.broadleafcommerce.core.order.service.manipulation.OrderItemVisitor;
import org.broadleafcommerce.core.pricing.service.exception.PricingException;
import org.hibernate.annotations.BatchSize;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.Index;
import org.hibernate.annotations.NotFound;
import org.hibernate.annotations.NotFoundAction;

import javax.persistence.CascadeType;
import javax.persistence.CollectionTable;
import javax.persistence.Column;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.MapKeyColumn;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@Table(name = "BLC_DISCRETE_ORDER_ITEM")
@Cache(usage=CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region="blOrderElements")
@AdminPresentationClass(friendlyName = "DiscreteOrderItemImpl_discreteOrderItem")
@AdminPresentationOverrides({@AdminPresentationOverride(name="product.defaultSku", value=@AdminPresentation(excluded = true))})
public class DiscreteOrderItemImpl extends OrderItemImpl implements DiscreteOrderItem {

    private static final long serialVersionUID = 1L;
    
    @Column(name="BASE_RETAIL_PRICE", precision=19, scale=5)
    @AdminPresentation(friendlyName = "DiscreteOrderItemImpl_Base_Retail_Price", order=2, group = "DiscreteOrderItemImpl_Pricing", fieldType=SupportedFieldType.MONEY)
    protected BigDecimal baseRetailPrice;
    
    @Column(name="BASE_SALE_PRICE", precision=19, scale=5)
    @AdminPresentation(friendlyName = "DiscreteOrderItemImpl_Base_Sale_Price", order=2, group = "DiscreteOrderItemImpl_Pricing", fieldType= SupportedFieldType.MONEY)
    protected BigDecimal baseSalePrice;
    
    @ManyToOne(targetEntity = SkuImpl.class, optional=false)
    @JoinColumn(name = "SKU_ID", nullable = false)
    @Index(name="DISCRETE_SKU_INDEX", columnNames={"SKU_ID"})
    protected Sku sku;

    @ManyToOne(targetEntity = ProductImpl.class)
    @JoinColumn(name = "PRODUCT_ID")
    @Index(name="DISCRETE_PRODUCT_INDEX", columnNames={"PRODUCT_ID"})
    @NotFound(action = NotFoundAction.IGNORE)
    protected Product product;

    @ManyToOne(targetEntity = BundleOrderItemImpl.class)
    @JoinColumn(name = "BUNDLE_ORDER_ITEM_ID")
    @AdminPresentation(excluded = true)
    protected BundleOrderItem bundleOrderItem;

    @ManyToOne(targetEntity = SkuBundleItemImpl.class)
    @JoinColumn(name = "SKU_BUNDLE_ITEM_ID")
    @AdminPresentation(excluded = true)
    protected SkuBundleItem skuBundleItem;

    @ElementCollection
    @MapKeyColumn(name="NAME")
    @Column(name="VALUE")
    @CollectionTable(name="BLC_ORDER_ITEM_ADD_ATTR", joinColumns=@JoinColumn(name="ORDER_ITEM_ID"))
    @BatchSize(size = 50)
    protected Map<String, String> additionalAttributes = new HashMap<String, String>();
    
    @OneToMany(mappedBy = "discreteOrderItem", targetEntity = DiscreteOrderItemFeePriceImpl.class, cascade = { CascadeType.ALL })
    @Cascade(value = { org.hibernate.annotations.CascadeType.ALL, org.hibernate.annotations.CascadeType.DELETE_ORPHAN })
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = "blOrderElements")
    protected List<DiscreteOrderItemFeePrice> discreteOrderItemFeePrices = new ArrayList<DiscreteOrderItemFeePrice>();

    @Override
    public Sku getSku() {
        return sku;
    }

    @Override
    public void setSku(Sku sku) {
        this.sku = sku;
        if (sku.getRetailPrice() != null) {
            this.baseRetailPrice = sku.getRetailPrice().getAmount();
        }
        if (sku.getSalePrice() != null) {
            this.baseSalePrice = sku.getSalePrice().getAmount();
        }
        this.itemTaxable = sku.isTaxable();
        setName(sku.getName());
    }

    @Override
    public Money getTaxablePrice() {
        Money taxablePrice = BroadleafCurrencyUtils.getMoney(BigDecimal.ZERO, getOrder().getCurrency());
        if (sku.isTaxable() == null || sku.isTaxable()) {
            taxablePrice = getPrice();
        }
        return taxablePrice;
    }

    @Override
    public Product getProduct() {
        return product;
    }

    @Override
    public void setProduct(Product product) {
        this.product = product;
    }

    @Override
    public BundleOrderItem getBundleOrderItem() {
        return bundleOrderItem;
    }

    @Override
    public void setBundleOrderItem(BundleOrderItem bundleOrderItem) {
        if (this.order != null && bundleOrderItem != null) {
            throw new IllegalStateException("Cannot set a BundleOrderItem on a DiscreteOrderItem that is already associated with an Order");
        }
        this.bundleOrderItem = bundleOrderItem;
    }

    @Override
    public void setOrder(Order order) {
        if (order != null && bundleOrderItem != null) {
            throw new IllegalStateException("Cannot set an Order on a DiscreteOrderItem that is already associated with a BundleOrderItem");
        }
        this.order = order;
    }

    /**
     * If this item is part of a bundle that was created via a ProductBundle, then this
     * method returns a reference to the corresponding SkuBundleItem.
     * <p/>
     * For manually created
     * <p/>
     * For all others, this method returns null.
     *
     * @return
     */
    @Override
    public SkuBundleItem getSkuBundleItem() {
        return skuBundleItem;
    }

    /**
     * Sets the associated SkuBundleItem.
     *
     * @param SkuBundleItem
     */
    @Override
    public void setSkuBundleItem(SkuBundleItem SkuBundleItem) {
        this.skuBundleItem =SkuBundleItem;
    }

    @Override
    public String getName() {
        String name = super.getName();
        if (name == null) {
            return sku.getName();
        }
        return name;
    }
    
    @Override
    public Order getOrder() {
        if (order == null) {
            if (getBundleOrderItem() != null) {
                return getBundleOrderItem().getOrder();
            }
        }
        return order;
    }

    @Override
    public boolean updatePrices() {
        Money skuRetailPrice = getSku().getRetailPrice();
        Money skuSalePrice = (getSku().getSalePrice() == null ? null : getSku().getSalePrice());

        // Override retail/sale prices from skuBundle.
        if (skuBundleItem != null) {
            if (skuBundleItem.getSalePrice() != null) {
                skuSalePrice = skuBundleItem.getSalePrice();
            }

            if (skuBundleItem.getRetailPrice() != null) {
                skuRetailPrice = skuBundleItem.getRetailPrice();
            }
        }

        boolean updated = false;
        //use the sku prices - the retail and sale prices could be null
        if (!skuRetailPrice.equals(getRetailPrice())) {
            setBaseRetailPrice(skuRetailPrice);
            setRetailPrice(skuRetailPrice);
            updated = true;
        }
        if (skuSalePrice != null && !skuSalePrice.equals(getSalePrice())) {
            setBaseSalePrice(skuSalePrice);
            setSalePrice(skuSalePrice);
            updated = true;
        }

        // Adjust prices by adding in fees if they are attached.
        if (getDiscreteOrderItemFeePrices() != null) {
            for (DiscreteOrderItemFeePrice fee : getDiscreteOrderItemFeePrices()) {
                setSalePrice(getSalePrice().add(fee.getAmount()));
                setRetailPrice(getRetailPrice().add(fee.getAmount()));
            }
        }
        return updated;
    }

    @Override
    public Map<String, String> getAdditionalAttributes() {
        return additionalAttributes;
    }

    @Override
    public void setAdditionalAttributes(Map<String, String> additionalAttributes) {
        this.additionalAttributes = additionalAttributes;
    }

    @Override
    public Money getBaseRetailPrice() {
        return convertToMoney(baseRetailPrice);
    }

    @Override
    public void setBaseRetailPrice(Money baseRetailPrice) {
        this.baseRetailPrice = baseRetailPrice.getAmount();
    }

    @Override
    public Money getBaseSalePrice() {
        return convertToMoney(baseSalePrice);
    }

    @Override
    public void setBaseSalePrice(Money baseSalePrice) {
        this.baseSalePrice = baseSalePrice==null?null:baseSalePrice.getAmount();
    }

    @Override
    public List<DiscreteOrderItemFeePrice> getDiscreteOrderItemFeePrices() {
        return discreteOrderItemFeePrices;
    }

    @Override
    public void setDiscreteOrderItemFeePrices(List<DiscreteOrderItemFeePrice> discreteOrderItemFeePrices) {
        this.discreteOrderItemFeePrices = discreteOrderItemFeePrices;
    }

    protected Money convertToMoney(BigDecimal amount) {
        return amount == null ? null : BroadleafCurrencyUtils.getMoney(amount, getOrder().getCurrency());
    }
    
    @Override
    public OrderItem clone() {
        DiscreteOrderItem orderItem = (DiscreteOrderItem) super.clone();
        if (discreteOrderItemFeePrices != null) {
            for (DiscreteOrderItemFeePrice feePrice : discreteOrderItemFeePrices) {
                DiscreteOrderItemFeePrice cloneFeePrice = feePrice.clone();
                cloneFeePrice.setDiscreteOrderItem(orderItem);
                orderItem.getDiscreteOrderItemFeePrices().add(cloneFeePrice);
            }
        }
        if (additionalAttributes != null) {
            orderItem.getAdditionalAttributes().putAll(additionalAttributes);
        }
        orderItem.setBaseRetailPrice(convertToMoney(baseRetailPrice));
        orderItem.setBaseSalePrice(convertToMoney(baseSalePrice));
        orderItem.setBundleOrderItem(bundleOrderItem);
        orderItem.setProduct(product);
        orderItem.setSku(sku);

        if (orderItem.getOrder() == null) {
            throw new IllegalStateException("Either an Order or a BundleOrderItem must be set on the DiscreteOrderItem");
        }
        
        return orderItem;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        DiscreteOrderItemImpl other = (DiscreteOrderItemImpl) obj;
        
        if (!super.equals(obj)) {
            return false;
        }

        if (id != null && other.id != null) {
            return id.equals(other.id);
        }

        if (bundleOrderItem == null) {
            if (other.bundleOrderItem != null) {
                return false;
            }
        } else if (!bundleOrderItem.equals(other.bundleOrderItem)) {
            return false;
        }
        if (sku == null) {
            if (other.sku != null) {
                return false;
            }
        } else if (!sku.equals(other.sku)) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        final int prime = super.hashCode();
        int result = 1;
        result = prime * result + ((bundleOrderItem == null) ? 0 : bundleOrderItem.hashCode());
        result = prime * result + ((sku == null) ? 0 : sku.hashCode());
        return result;
    }
    
    @Override
    public void accept(OrderItemVisitor visitor) throws PricingException {
        visitor.visit(this);
    }

}
