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/*
 * Copyright 2015-2016 Canoo Engineering AG.
 *
 * 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 com.canoo.dolphin.server.spring;


import com.canoo.dolphin.server.DolphinSession;
import com.canoo.dolphin.server.context.DolphinSessionProvider;
import com.canoo.dolphin.util.Assert;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.config.Scope;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * Implementation of the {@link ClientScoped} scope
 */
public class ClientScope implements Scope {

    public final static String CLIENT_SCOPE = "client";

    private final static String CLIENT_STORE_ATTRIBUTE = "DolphinPlatformSpringClientScopeStore";

    private final DolphinSessionProvider dolphinSessionProvider;

    public ClientScope(final DolphinSessionProvider dolphinSessionProvider) {
        Assert.requireNonNull(dolphinSessionProvider, "dolphinSessionProvider");
        this.dolphinSessionProvider = dolphinSessionProvider;
    }

    @Override
    public Object get(final String name, final ObjectFactory objectFactory) {
        Assert.requireNonBlank(name, "name");
        Assert.requireNonNull(objectFactory, "objectFactory");
        Map localStore = getLocalStore();
        if (!localStore.containsKey(name)) {
            localStore.put(name, objectFactory.getObject());
        }
        return localStore.get(name);
    }

    @Override
    public Object remove(final String name) {
        return getLocalStore().remove(name);
    }

    @Override
    public void registerDestructionCallback(final String name, final Runnable callback) {

    }

    @Override
    public Object resolveContextualObject(final String key) {
        return null;
    }

    private Map getLocalStore() {
        DolphinSession session = getDolphinSession();
        if(session == null) {
            throw new IllegalStateException("No dolphin request found! Looks like you try to use the " + ClientScope.class.getSimpleName() + " ouside of the dolphin context!");
        }
        Map localStore = session.getAttribute(CLIENT_STORE_ATTRIBUTE);
        if(localStore == null) {
            localStore = Collections.synchronizedMap(new HashMap());
            session.setAttribute(CLIENT_STORE_ATTRIBUTE, localStore);
        }
        return localStore;
    }

    @Override
    public String getConversationId() {
        return getDolphinSession().getId();
    }

    private DolphinSession getDolphinSession() {
        return dolphinSessionProvider.getCurrentDolphinSession();
    }
}