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package io.sphere.sdk.products;

import com.fasterxml.jackson.annotation.JsonCreator;
import io.sphere.sdk.json.JsonException;
import io.sphere.sdk.products.attributes.Attribute;
import io.sphere.sdk.products.attributes.AttributeMapper;

import javax.annotation.Nullable;
import java.util.List;
import java.util.Optional;

import static java.lang.String.format;

class ProductVariantImpl extends AttributeContainerImpl implements ProductVariant {
    @Nullable
    private String productId;//hack for VariantIdentifier getter
    private final Integer id;
    @Nullable
    private final String sku;
    private final List prices;
    private final List images;
    @Nullable
    private final ProductVariantAvailability availability;

    @JsonCreator
    ProductVariantImpl(final Integer id, final String sku, final List prices,
                       final List attributes, final List images,
                       final ProductVariantAvailability availability, final String productId) {
        super(attributes);
        this.id = id;
        this.sku = sku;
        this.prices = prices;
        this.images = images;
        this.availability = availability;
        this.productId = productId;
    }

    @Override
    public Integer getId() {
        return id;
    }

    @Override
    @Nullable
    public String getSku() {
        return sku;
    }

    @Override
    public List getPrices() {
        return prices;
    }

    @Override
    public List getImages() {
        return images;
    }

    @Override
    @Nullable
    public ProductVariantAvailability getAvailability() {
        return availability;
    }

    @Override
    public VariantIdentifier getIdentifier() {
        return Optional.ofNullable(productId).map(pId -> VariantIdentifier.of(pId, getId())).orElseThrow(UnsupportedOperationException::new);
    }

    @Override
    protected JsonException transformError(JsonException e, String attributeName, AttributeMapper mapper) {
        return enrich(format("ProductVariant(id=%s)", id), attributeName, mapper, e.getCause());
    }

    //required trick for variant identifier
    void setProductId(@Nullable final String productId) {
        this.productId = productId;
    }

    private JsonException enrich(final Object objectWithAttributes, final String attributeName, final AttributeMapper mapper, final Throwable cause) {
        return new JsonException(format("%s does not contain an attribute '%s' which can be mapped with %s.", objectWithAttributes, attributeName, mapper), cause);
    }
}