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/*
 * Copyright (c) 2008-2023 The Aspectran Project
 *
 * 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.aspectran.core.component.session;

import java.util.Collections;
import java.util.Enumeration;

/**
 * Session processing delegate by request.
 *
 * Created: 2017. 9. 10.
 */
public class SessionAgent {

    private final SessionHandler sessionHandler;

    private volatile String sessionId;

    public SessionAgent(SessionHandler sessionHandler) {
        this.sessionHandler = sessionHandler;
    }

    public String getId() {
        return getSession(true).getId();
    }

    public long getCreationTime() {
        return getSession(true).getCreationTime();
    }

    public long getLastAccessedTime() {
        return getSession(true).getLastAccessedTime();
    }

    public int getMaxInactiveInterval() {
        return getSession(true).getMaxInactiveInterval();
    }

    public void setMaxInactiveInterval(int secs) {
        getSession(true).setMaxInactiveInterval(secs);
    }

    public Enumeration getAttributeNames() {
        Session session = getSession(false);
        if (session == null) {
            return null;
        }
        return Collections.enumeration(session.getAttributeNames());
    }

    public  T getAttribute(String name) {
        Session session = getSession(false);
        if (session == null) {
            return null;
        }
        return session.getAttribute(name);
    }

    public void setAttribute(String name, Object value) {
        getSession(true).setAttribute(name, value);
    }

    public void removeAttribute(String name) {
        Session session = getSession(false);
        if (session != null) {
            session.removeAttribute(name);
        }
    }

    public Session getSession(boolean create) {
        if (sessionId == null && !create) {
            return null;
        }
        if (sessionId != null) {
            Session session = sessionHandler.getSession(sessionId);
            if (session == null && create) {
                session = createSession();
            }
            return session;
        } else {
            return createSession();
        }
    }

    private Session createSession() {
        sessionId = sessionHandler.createSessionId(hashCode());
        return sessionHandler.createSession(sessionId);
    }

    public void invalidate() {
        Session session = getSession(false);
        if (session != null) {
            session.invalidate();
        }
    }

    public boolean isValid() {
        Session session = getSession(false);
        return (session != null && session.isValid());
    }

    public boolean isNew() {
        Session session = getSession(false);
        return (session == null || session.isNew());
    }

    /**
     * Called when a session is first accessed by an {@code Activity}.
     */
    public void access() {
        Session session = getSession(false);
        if (session != null) {
            session.access();
        }
    }

    /**
     * Called when a session is last accessed by an {@code Activity}.
     */
    public void complete() {
        Session session = getSession(false);
        if (session != null) {
            session.complete();
        }
    }

}