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package com.avaje.ebeaninternal.server.expression;

import com.avaje.ebean.event.BeanQueryRequest;
import com.avaje.ebeaninternal.api.ManyWhereJoins;
import com.avaje.ebeaninternal.api.SpiExpression;
import com.avaje.ebeaninternal.api.SpiExpressionRequest;
import com.avaje.ebeaninternal.api.SpiLuceneExpr;
import com.avaje.ebeaninternal.server.deploy.BeanDescriptor;
import com.avaje.ebeaninternal.server.query.LuceneResolvableRequest;
import com.avaje.ebeaninternal.util.DefaultExpressionRequest;


/**
 * Slightly redundant as Query.setId() ultimately also does the same job.
 */
class IdExpression implements SpiExpression {

	private static final long serialVersionUID = -3065936341718489842L;

	private final Object value;
	
	IdExpression(Object value) {
		this.value = value;
	}
	
    public boolean isLuceneResolvable(LuceneResolvableRequest req) {
        return false;
    }

    public SpiLuceneExpr createLuceneExpr(SpiExpressionRequest request) {
        return null;
//        BeanProperty[] properties = request.getBeanDescriptor().getIdBinder().getProperties();
//        if (properties.length != 1){
//            throw new RuntimeException("Only support single Ids for now");
//        }
//        String idAsString = properties[0].getScalarType().format(value);
//        String idProperty = properties[0].getName();
//        
//        QueryParser queryParser = request.createQueryParser(idProperty);
//        return queryParser.parse(idAsString);    
    }

	/**
	 * Always returns false.
	 */
	public void containsMany(BeanDescriptor desc, ManyWhereJoins manyWhereJoin) {
		
	}

	public void addBindValues(SpiExpressionRequest request) {
		
		// 'flatten' EmbeddedId and multiple Id cases
		// into an array of the underlying scalar field values
		DefaultExpressionRequest r = (DefaultExpressionRequest)request;
		Object[] bindIdValues = r.getBeanDescriptor().getBindIdValues(value);
		for (int i = 0; i < bindIdValues.length; i++) {
			request.addBindValue(bindIdValues[i]);
		}	
	}

	public void addSql(SpiExpressionRequest request) {
		
		DefaultExpressionRequest r = (DefaultExpressionRequest)request;
		String idSql = r.getBeanDescriptor().getIdBinderIdSql();
		
		request.append(idSql).append(" ");
	}

	/**
	 * No properties so this is just a unique static number.
	 */
	public int queryAutoFetchHash() {
		// this number is unique for a given bean type
		// which is all that is required
		return IdExpression.class.getName().hashCode();
	}

	public int queryPlanHash(BeanQueryRequest request) {
		return queryAutoFetchHash();
	}

	public int queryBindHash() {
		return value.hashCode();
	}
	
	
}