package geniusweb.profile.utilityspace;

import java.util.ArrayList;
import java.util.List;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonValue;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;

import geniusweb.issuevalue.Value;

/**
 * A {@link Value} that is the product of some existing values
 */
@JsonDeserialize(using = JsonDeserializer.None.class)
public class ProductOfValue implements Value {
	private final List<Value> values = new ArrayList<Value>();

	/**
	 * @param newvals the values to make a product of
	 */
	@JsonCreator
	public ProductOfValue(List<Value> newvals) {
		values.addAll(newvals);
	}

	@JsonValue
	public List<Value> getValues() {
		return values;
	}

	@Override
	public String toString() {
		return values.toString();
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((values == null) ? 0 : values.hashCode());
		return result;
	}

	/**
	 * 
	 * @param other a {@link ProductOfValue} with more issues to be merged into
	 *              this.
	 * @return new ProductOfValue that contains this and other values.
	 */
	public ProductOfValue merge(ProductOfValue other) {
		List<Value> newvalues = new ArrayList<Value>(values);
		newvalues.addAll(other.getValues());
		return new ProductOfValue(newvalues);
	}

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

	@Override
	public Object getValue() {
		return getValues();
	}

}