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/*
 * Copyright 2001-2012 Remi Vankeisbelck
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package woko.persistence.faceted;

import woko.Woko;
import woko.actions.WokoRequestInterceptor;
import woko.persistence.ObjectStore;
import woko.persistence.ResultIterator;
import woko.util.WLogger;

import javax.servlet.http.HttpServletRequest;
import java.util.List;

public abstract class FacetedObjectStore implements ObjectStore {

    private static final WLogger logger = WLogger.getLogger(FacetedObjectStore.class);

    private HttpServletRequest getRequest() {
        return WokoRequestInterceptor.getRequest();
    }

    private Woko getWoko() {
        HttpServletRequest request = getRequest();
        if (request == null) {
            throw new IllegalStateException("Unable to get thread-bound request from WokoRequestInterceptor. Interceptor has not been invoked ?");
        }
        return Woko.getWoko(request.getSession().getServletContext());
    }

    @Override
    public Object load(String className, String key) {
        if (className == null && key == null) {
            logger.debug("className and key are null, nothing done");
            return null;
        }

        HttpServletRequest request = getRequest();
        Woko woko = getWoko();

        logger.debug("Trying to load object for class " + className + ", key " + key);
        Class mappedClass = getMappedClass(className);
        if (mappedClass == null) {
            logger.warn("No mapped class for className " + className + ", returning new Object()");
            return null;
        }
        if (key == null) {
            logger.debug("Key not specified for className " + className + ", returning null");
            // create transient instance
            StoreNew storeNew = woko.getFacet("storeNew", request, null, mappedClass, true);
            return storeNew.newInstance(this, mappedClass);
        }

        // load object
        StoreLoad storeLoad = woko.getFacet("storeLoad", request, null, mappedClass, true);
        return storeLoad.load(this, mappedClass, key);
    }

    private  T getFacet(Class facetClass, String name, Object targetObject, Class targetObjectClass) {
        HttpServletRequest request = getRequest();
        Woko woko = getWoko();
        return woko.getFacet(name, request, targetObject, targetObjectClass, true);
    }

    @Override
    public Object save(Object obj) {
        return getFacet(StoreSave.class, "storeSave", obj, obj.getClass()).save(this, obj);
    }

    @Override
    public Object delete(Object obj) {
        return getFacet(StoreDelete.class, "storeDelete", obj, obj.getClass()).delete(this, obj);
    }

    @Override
    public String getKey(Object obj) {
        return getFacet(StoreGetKey.class, "storeGetKey", obj, obj.getClass()).getKey(this, obj);
    }

    @Override
    public String getClassMapping(Class clazz) {
        return clazz.getSimpleName();
    }

    @Override
    public Class getMappedClass(String className) {
        if (className == null) {
            return null;
        }
        try {
            return Class.forName(className);
        } catch (ClassNotFoundException cnfex) {
            // try simple name
            for (Class clazz : getMappedClasses()) {
                String simpleName = clazz.getSimpleName();
                if (simpleName.equals(className)) {
                    return clazz;
                }
            }
        }
        return null;
    }

    @Override
    public ResultIterator list(String className, Integer start, Integer limit) {
        Class clazz = getMappedClass(className);
        return getFacet(StoreList.class, "storeList", null, clazz).list(this, className, start, limit);
    }

    @Override
    public abstract List> getMappedClasses();

    @Override
    public ResultIterator search(Object query, Integer start, Integer limit) {
        return getFacet(StoreSearch.class, "storeSearch", query, query.getClass()).search(this, query, start, limit);
    }
}