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package com.buschmais.xo.impl.proxy.entity.property;

import java.util.Collection;

import com.buschmais.xo.api.XOException;
import com.buschmais.xo.api.metadata.method.AbstractRelationPropertyMethodMetadata;
import com.buschmais.xo.impl.AbstractPropertyManager;
import com.buschmais.xo.impl.SessionContext;
import com.buschmais.xo.impl.proxy.collection.AbstractCollectionProxy;
import com.buschmais.xo.impl.proxy.collection.ListProxy;
import com.buschmais.xo.impl.proxy.collection.SetProxy;
import com.buschmais.xo.impl.proxy.common.property.AbstractPropertyMethod;

/**
 * Abstract base implementation for get methods returning collections of
 * datastore types.
 *
 * @param 
 *     The datastore type.
 * @param 
 *     The entity type.
 * @param 
 *     The relation type.
 * @param 
 *     The property manager.
 * @param 
 *     The method metadata.
 */
public abstract class AbstractCollectionPropertyGetMethod, M extends AbstractRelationPropertyMethodMetadata>
    extends AbstractPropertyMethod {

    private final SessionContext sessionContext;

    private CollectionPropertyType collectionPropertyType;

    /**
     * Constructor.
     *
     * @param sessionContext
     *     The session context.
     * @param propertyManager
     *     The property manager.
     * @param metadata
     *     The metadata.
     */
    public AbstractCollectionPropertyGetMethod(SessionContext sessionContext, PropertyManager propertyManager,
        M metadata) {
        super(propertyManager, metadata);
        this.sessionContext = sessionContext;
        this.collectionPropertyType = CollectionPropertyType.getCollectionPropertyType(metadata.getAnnotatedMethod()
            .getType());
    }

    @Override
    public Object invoke(DatastoreType entity, Object instance, Object[] args) {
        AbstractCollectionProxy collectionProxy = createCollectionProxy(entity, sessionContext);
        Collection collection;
        switch (collectionPropertyType) {
        case LIST:
            collection = new ListProxy<>(collectionProxy);
            break;
        case SET:
            collection = new SetProxy<>(collectionProxy);
            break;
        case COLLECTION:
            collection = collectionProxy;
            break;
        default:
            throw new XOException("Unsupported collection type " + collectionPropertyType);
        }
        return sessionContext.getInterceptorFactory()
            .addInterceptor(collection, collectionPropertyType.getCollectionType());
    }

    /**
     * Create the collection proxy instance.
     *
     * @param datastoreType
     *     The datastore type (i.e. representing the instance holding the
     *     collection property).
     * @param sessionContext
     *     The session context.
     * @return The collection proxy.
     */
    protected abstract AbstractCollectionProxy createCollectionProxy(DatastoreType datastoreType,
        SessionContext sessionContext);

}