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package io.sphere.sdk.carts.commands.updateactions;

import io.sphere.sdk.carts.Cart;
import io.sphere.sdk.channels.Channel;
import io.sphere.sdk.commands.UpdateActionImpl;
import io.sphere.sdk.models.Reference;
import io.sphere.sdk.models.Referenceable;
import io.sphere.sdk.products.ProductIdentifiable;
import io.sphere.sdk.types.CustomDraft;
import io.sphere.sdk.types.CustomFieldsDraft;

import javax.annotation.Nullable;

/**
    Adds a product variant in the given quantity to the cart.
    If the cart already contains the product variant then only the line item quantity is increased.

    {@doc.gen intro}

    {@include.example io.sphere.sdk.carts.commands.CartUpdateCommandTest#addLineItem()}
 */
public class AddLineItem extends UpdateActionImpl implements CustomDraft {
    private final String productId;
    private final Integer variantId;
    private final Long quantity;
    @Nullable
    private final Reference supplyChannel;
    @Nullable
    private final Reference distributionChannel;
    @Nullable
    private final CustomFieldsDraft custom;

    private AddLineItem(final String productId, final Integer variantId, final Long quantity, @Nullable final Reference supplyChannel, @Nullable final Reference distributionChannel, @Nullable final CustomFieldsDraft custom) {
        super("addLineItem");
        this.productId = productId;
        this.variantId = variantId;
        this.quantity = quantity;
        this.supplyChannel = supplyChannel;
        this.distributionChannel = distributionChannel;
        this.custom = custom;
    }

    public static AddLineItem of(final ProductIdentifiable product, final int variantId, final long quantity) {
        return of(product.getId(), variantId, quantity);
    }

    public static AddLineItem of(final String productId, final int variantId, final long quantity) {
        return new AddLineItem(productId, variantId, quantity, null, null, null);
    }

    public String getProductId() {
        return productId;
    }

    public Integer getVariantId() {
        return variantId;
    }

    public Long getQuantity() {
        return quantity;
    }

    @Nullable
    public Reference getDistributionChannel() {
        return distributionChannel;
    }

    @Nullable
    public Reference getSupplyChannel() {
        return supplyChannel;
    }

    @Nullable
    public CustomFieldsDraft getCustom() {
        return custom;
    }

    public AddLineItem withSupplyChannel(final Referenceable supplyChannel) {
        return new AddLineItem(getProductId(), getVariantId(), getQuantity(), supplyChannel.toReference(), getDistributionChannel(), getCustom());
    }

    public AddLineItem withDistributionChannel(final Referenceable distributionChannel) {
        return new AddLineItem(getProductId(), getVariantId(), getQuantity(), getSupplyChannel(), distributionChannel.toReference(), getCustom());
    }

    public AddLineItem withCustom(final CustomFieldsDraft custom) {
        return new AddLineItem(getProductId(), getVariantId(), getQuantity(), getSupplyChannel(), getDistributionChannel(), custom);
    }
}