/*
 * Copyright 2007 the original author or authors.
 * 
 * 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 org.mockftpserver.core.session;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.ListResourceBundle;
import java.util.Map;
import java.util.ResourceBundle;


import org.apache.log4j.Logger;
import org.mockftpserver.core.command.Command;
import org.mockftpserver.core.command.CommandHandler;
import org.mockftpserver.core.command.CommandNames;
import org.mockftpserver.core.command.InvocationRecord;
import org.mockftpserver.core.session.DefaultSession;
import org.mockftpserver.core.session.Session;
import org.mockftpserver.core.socket.StubSocket;
import org.mockftpserver.stub.command.AbstractStubCommandHandler;
import org.mockftpserver.stub.command.ConnectCommandHandler;
import org.mockftpserver.test.AbstractTest;

/**
 * Tests for the DefaultSession class that require the session (thread) to be running/active.
 * 
 * @version $Revision$ - $Date$
 * 
 * @author Chris Mair
 */
public final class DefaultSession_RunTest extends AbstractTest {

    private static final Logger LOG = Logger.getLogger(DefaultSession_RunTest.class);
    private static final Command COMMAND = new Command("USER", EMPTY);
    private static final int REPLY_CODE = 100;
    private static final String REPLY_TEXT = "sample text description";

    private DefaultSession session;
    private ByteArrayOutputStream outputStream;
    private Map commandHandlerMap;
    private StubSocket stubSocket;
    private boolean commandHandled = false;

    /**
     * Perform initialization before each test
     * 
     * @see org.mockftpserver.test.AbstractTest#setUp()
     */
    protected void setUp() throws Exception {
        super.setUp();
        commandHandlerMap = new HashMap();
        outputStream = new ByteArrayOutputStream();
    }

    /**
     * Test that the CommandHandler is properly initialized and passed the expected parameters
     */
    public void testInvocationOfCommandHandler() throws Exception {
        AbstractStubCommandHandler commandHandler = new AbstractStubCommandHandler() {
            public void handleCommand(Command command, Session cmdSession, InvocationRecord invocationRecord) {
                assertEquals("command", COMMAND, command);
                assertSame("session", session, cmdSession);
                assertEquals("InvocationRecord: command", COMMAND, invocationRecord.getCommand());
                assertEquals("InvocationRecord: clientHost", DEFAULT_HOST, invocationRecord.getClientHost());
                commandHandled = true;
            }
        };
        runCommandAndVerifyOutput(commandHandler, "");
    }

    /**
     * Test the close() method
     * 
     * @throws IOException
     */
    public void testClose() throws Exception {
        CommandHandler commandHandler = new AbstractStubCommandHandler() {
            public void handleCommand(Command command, Session session, InvocationRecord invocationRecord) {
                session.close();
                commandHandled = true;
            }
        };
        runCommandAndVerifyOutput(commandHandler, "");
        assertFalse("socket should not be closed", stubSocket.isClosed());
    }

    /**
     * Test the getClientHost() method
     * 
     * @throws IOException
     */
    public void testGetClientHost() throws Exception {
        CommandHandler commandHandler = new AbstractStubCommandHandler() {
            public void handleCommand(Command command, Session session, InvocationRecord invocationRecord) {
                commandHandled = true;
            }
        };
        runCommandAndVerifyOutput(commandHandler, "");
        LOG.info("clientHost=" + session.getClientHost());
        assertEquals("clientHost", DEFAULT_HOST, session.getClientHost());
    }

    /**
     * Test the sendReply() method, when the specified reply text is null
     */
    public void testSendReply_NullReplyText() throws Exception {
        CommandHandler commandHandler = new AbstractStubCommandHandler() {
            public void handleCommand(Command command, Session session, InvocationRecord invocationRecord) {
                session.sendReply(REPLY_CODE, null);
                commandHandled = true;
            }
        };
        runCommandAndVerifyOutput(commandHandler, Integer.toString(REPLY_CODE));
    }

    /**
     * Test the sendReply() method, verifying that extra extra whitespace is trimmed from the reply text
     */
    public void testSendReply_TrimReplyText() throws Exception {
        CommandHandler commandHandler = new AbstractStubCommandHandler() {
            public void handleCommand(Command command, Session session, InvocationRecord invocationRecord) {
                session.sendReply(REPLY_CODE, " " + REPLY_TEXT + " ");
                commandHandled = true;
            }
        };
        runCommandAndVerifyOutput(commandHandler, REPLY_CODE + " " + REPLY_TEXT);
    }

    /**
     * Test the sendReply() method, when the text contains multiple lines
     */
    public void testSendReply_MultiLineText() throws Exception {
        final String MULTILINE_REPLY_TEXT = "abc\ndef\nghi\njkl";
        final String FORMATTED_MULTILINE_REPLY_TEXT = "123-abc\ndef\nghi\n123 jkl";

        CommandHandler commandHandler = new AbstractStubCommandHandler() {
            public void handleCommand(Command command, Session session, InvocationRecord invocationRecord) {
                session.sendReply(123, MULTILINE_REPLY_TEXT);
                commandHandled = true;
            }
        };
        runCommandAndVerifyOutput(commandHandler, FORMATTED_MULTILINE_REPLY_TEXT);
    }

    /**
     * Test the sendReply() method when the reply code has associated reply text
     */
    public void testSendReply_ReplyText() throws Exception {
        CommandHandler commandHandler = new AbstractStubCommandHandler() {
            public void handleCommand(Command command, Session session, InvocationRecord invocationRecord) {
                session.sendReply(REPLY_CODE, REPLY_TEXT);
                commandHandled = true;
            }
        };
        runCommandAndVerifyOutput(commandHandler, REPLY_CODE + " " + REPLY_TEXT);
    }

    // -------------------------------------------------------------------------
    // Internal Helper Methods
    // -------------------------------------------------------------------------

    /**
     * Create and return a DefaultSession object that reads from an InputStream with the specified
     * contents and writes to the predefined outputStrean ByteArrayOutputStream. Also, save the
     * StubSocket being used in the stubSocket attribute.
     * 
     * @param inputStreamContents - the contents of the input stream
     * @return the DefaultSession
     */
    private DefaultSession createDefaultSession(CommandHandler commandHandler) {
        stubSocket = createTestSocket(COMMAND.getName());
        commandHandlerMap.put(COMMAND.getName(), commandHandler);
        
        ConnectCommandHandler connectCommandHandler = new ConnectCommandHandler();
        
        ResourceBundle replyTextBundle = new ListResourceBundle() {
            protected Object[][] getContents() {
                return new Object[][] { 
                        { "220", "Reply for 220" }, 
                };
            }
        };
        connectCommandHandler.setReplyTextBundle(replyTextBundle);
        commandHandlerMap.put(CommandNames.CONNECT, connectCommandHandler);

        return new DefaultSession(stubSocket, commandHandlerMap);
    }

    /**
     * Create and return a StubSocket that reads from an InputStream with the specified contents and
     * writes to the predefined outputStrean ByteArrayOutputStream.
     * 
     * @param inputStreamContents - the contents of the input stream
     * @return the StubSocket
     */
    private StubSocket createTestSocket(String inputStreamContents) {
        InputStream inputStream = new ByteArrayInputStream(inputStreamContents.getBytes());
        return new StubSocket(DEFAULT_HOST, inputStream, outputStream);
    }

    /**
     * Run the command represented by the CommandHandler and verify that the session output from the
     * control socket contains the expected output text.
     * 
     * @param commandHandler - the CommandHandler to invoke
     * @param expectedOutput - the text expected within the session output
     * @throws InterruptedException
     */
    private void runCommandAndVerifyOutput(CommandHandler commandHandler, String expectedOutput)
            throws InterruptedException {
        session = createDefaultSession(commandHandler);

        Thread thread = new Thread(session);
        thread.start();

        for (int i = 0; !commandHandled && i < 10; i++) {
            Thread.sleep(50L);
        }

        session.close();
        thread.join();

        assertEquals("commandHandled", true, commandHandled);

        String output = outputStream.toString().trim();
        LOG.info("output=[" + output + "]");
        assertTrue("output: expected [" + expectedOutput + "]", output.indexOf(expectedOutput) != -1);
    }

}