package org.maltparser.core.syntaxgraph.feature;

import org.maltparser.core.exception.MaltChainedException;
import org.maltparser.core.feature.function.AddressFunction;
import org.maltparser.core.feature.value.AddressValue;
import org.maltparser.core.io.dataformat.ColumnDescription;
import org.maltparser.core.io.dataformat.DataFormatInstance;
import org.maltparser.core.symbol.nullvalue.NullValues.NullValueId;
import org.maltparser.core.syntaxgraph.SyntaxGraphException;
import org.maltparser.core.syntaxgraph.node.DependencyNode;

/**
 *
 *
 * @author Johan Hall
 */
public class OutputColumnFeature extends ColumnFeature {
	private final DataFormatInstance dataFormatInstance;
	private AddressFunction addressFunction;
	
	
	public OutputColumnFeature(DataFormatInstance dataFormatInstance) throws MaltChainedException {
		super();
		this.dataFormatInstance = dataFormatInstance;
	}
	
	public void initialize(Object[] arguments) throws MaltChainedException {
		if (arguments.length != 2) {
			throw new SyntaxGraphException("Could not initialize OutputColumnFeature: number of arguments are not correct. ");
		}
		if (!(arguments[0] instanceof String)) {
			throw new SyntaxGraphException("Could not initialize OutputColumnFeature: the first argument is not a string. ");
		}
		if (!(arguments[1] instanceof AddressFunction)) {
			throw new SyntaxGraphException("Could not initialize OutputColumnFeature: the second argument is not an address function. ");
		}
		ColumnDescription column = dataFormatInstance.getColumnDescriptionByName((String)arguments[0]);
		if (column == null) {
			throw new SyntaxGraphException("Could not initialize OutputColumnFeature: the output column type '"+(String)arguments[0]+"' could not be found in the data format specification. ' ");
		}
		setColumn(column);
		setAddressFunction((AddressFunction)arguments[1]);
	}
	
	public Class<?>[] getParameterTypes() {
		Class<?>[] paramTypes = { java.lang.String.class, org.maltparser.core.feature.function.AddressFunction.class };
		return paramTypes; 
	}

	public void update()  throws MaltChainedException {
		final AddressValue a = addressFunction.getAddressValue();
		
		if (a.getAddress() == null) {
			featureValue.update(column.getSymbolTable().getNullValueCode(NullValueId.NO_NODE), 
					column.getSymbolTable().getNullValueSymbol(NullValueId.NO_NODE), true, 1);
		} else {
			final DependencyNode node = (DependencyNode)a.getAddress();
			if (!node.isRoot()) {
				if (node.hasHead()) {
					int indexCode = node.getHeadEdge().getLabelCode(column.getSymbolTable());
					String symbol = column.getSymbolTable().getSymbolCodeToString(indexCode);
					if (column.getType() == ColumnDescription.STRING) {
						featureValue.update(indexCode, symbol, false, 1);
					} else {
						castFeatureValue(symbol);
					}
				} else {
					featureValue.update(column.getSymbolTable().getNullValueCode(NullValueId.NO_VALUE), 
							column.getSymbolTable().getNullValueSymbol(NullValueId.NO_VALUE), true, 1);
				}	
			} else {
				featureValue.update(column.getSymbolTable().getNullValueCode(NullValueId.ROOT_NODE), 
						column.getSymbolTable().getNullValueSymbol(NullValueId.ROOT_NODE), true, 1);
			}
		}
		
	}
	
	public AddressFunction getAddressFunction() {
		return addressFunction;
	}

	public void setAddressFunction(AddressFunction addressFunction) {
		this.addressFunction = addressFunction;
	}
	
	public DataFormatInstance getDataFormatInstance() {
		return dataFormatInstance;
	}

	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		return obj.toString().equals(toString());
	}
	
	public int hashCode() {
		return 217 + (null == toString() ? 0 : toString().hashCode());
	}
	
	public String toString() {
		final StringBuilder sb = new StringBuilder();
		sb.append("OutputColumn(");
		sb.append(super.toString());
		sb.append(", ");
		sb.append(addressFunction.toString());
		sb.append(")");
		return sb.toString();
	}
}
