/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.shiro.test;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.UnavailableSecurityManagerException;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.subject.support.SubjectThreadState;
import org.apache.shiro.util.LifecycleUtils;
import org.apache.shiro.util.ThreadState;
import org.junit.AfterClass;

/**
 * Abstract test case showing how to use Shiro in testing environments.
 *
 * @since 1.2
 */
public abstract class AbstractShiroTest {

    private static ThreadState subjectThreadState;

    public AbstractShiroTest() {
    }

    /**
     * Allows subclasses to set the currently executing {@link Subject} instance.
     *
     * @param subject the Subject instance
     */
    protected void setSubject(Subject subject) {
        clearSubject();
        subjectThreadState = createThreadState(subject);
        subjectThreadState.bind();
    }

    protected Subject getSubject() {
        return SecurityUtils.getSubject();
    }

    protected ThreadState createThreadState(Subject subject) {
        return new SubjectThreadState(subject);
    }

    /**
     * Clears Shiro's thread state, ensuring the thread remains clean for future test execution.
     */
    protected void clearSubject() {
        doClearSubject();
    }

    private static void doClearSubject() {
        if (subjectThreadState != null) {
            subjectThreadState.clear();
            subjectThreadState = null;
        }
    }

    protected static void setSecurityManager(SecurityManager securityManager) {
        SecurityUtils.setSecurityManager(securityManager);
    }

    protected static SecurityManager getSecurityManager() {
        return SecurityUtils.getSecurityManager();
    }

    @AfterClass
    public static void tearDownShiro() {
        doClearSubject();
        try {
            SecurityManager securityManager = getSecurityManager();
            LifecycleUtils.destroy(securityManager);
        } catch (UnavailableSecurityManagerException e) {
            //we don't care about this when cleaning up the test environment
            //(for example, maybe the subclass is a unit test and it didn't
            // need a SecurityManager instance because it was using only mock Subject instances)
        }
        setSecurityManager(null);
    }
}
