package org.alfresco.repo.virtual.template;

import java.io.Serializable;

import org.alfresco.repo.virtual.ActualEnvironment;
import org.alfresco.repo.virtual.VirtualizationException;
import org.alfresco.service.cmr.search.SearchParameters;
import org.alfresco.service.cmr.search.SearchService;
import org.alfresco.service.namespace.NamespacePrefixResolver;
import org.alfresco.service.namespace.QName;

/**
 * Specifies a constraint on a property value, as for e.g.
 * ContentModel.PROP_NAME, to be applied to queries given in the virtual folder
 * template.
 *
 * @author Bogdan Horje
 */
public class PropertyValueConstraint extends VirtualQueryConstraintDecorator
{
    // TODO: introduce operator

    private QName property;

    private Serializable value;

    private NamespacePrefixResolver nspResolver;

    public PropertyValueConstraint(VirtualQueryConstraint decoratedConstraint, QName property, Serializable value,
                NamespacePrefixResolver nspResolver)
    {
        super(decoratedConstraint);
        this.property = property;
        this.value = value;
        this.nspResolver = nspResolver;
    }

    @Override
    public SearchParameters applyDecorations(ActualEnvironment environment, SearchParameters searchParameters,
                VirtualQuery query) throws VirtualizationException
    {
        // TODO: allow custom language and not only constraint appliers

        if (SearchService.LANGUAGE_FTS_ALFRESCO.equals(searchParameters.getLanguage()))
        {
            SearchParameters searchParametersCopy = searchParameters.copy();
            return applyFTS(searchParametersCopy);
        }
        else
        {
            throw new VirtualizationException("Unsupported constrating language " + searchParameters.getLanguage());
        }

    }

    protected SearchParameters applyFTS(SearchParameters searchParameters)
    {
        SearchParameters constrainedParameters = searchParameters.copy();
        String theQuery = constrainedParameters.getQuery();

        // TODO: introduce and use operator

        theQuery = "(" + theQuery + ")" + " and " + "( " + "=" + property.toPrefixString(this.nspResolver) + ":"
                    +"\""+value.toString() + "\" )";

        constrainedParameters.setQuery(theQuery);

        return constrainedParameters;
    }
}