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/*-*- mode: Java; tab-width:8 -*-*/

package io.soluble.pjb.bridge.http;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.net.UnknownHostException;
import java.util.Map;

import io.soluble.pjb.bridge.Util;
import io.soluble.pjb.bridge.Util.Process;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * A factory which creates FastCGI "named pipe" channels.
 *
 * @author jostb
 */

public class NPChannelFactory extends FCGIConnectionFactory {
    /**
     * The named pipe prefix
     */
    public static final String PREFIX = "\\\\.\\pipe\\";

    private String raPath;
    private String testRaPath;

    /**
     * Create a new factory using a given processFactory
     *
     * @param processFactory the FCGIProcessFactory
     */
    public NPChannelFactory(IFCGIProcessFactory processFactory) {
        super(processFactory);
    }

    /**
     * Tests if the channel will be available.
     *
     * @throws FCGIConnectException
     */
    public void test() throws FCGIConnectException {
        if (!new File(raPath).canWrite()) {
            String reason = "File " + raPath + " not writable";
            if (lastException != null) {
                throw new FCGIConnectException(reason, lastException);
            }
            throw new FCGIConnectException(new IOException(reason));
        }
    }

    private NPChannel doConnect() throws FCGIConnectException {
        try {
            return new NPChannel(new RandomAccessFile(raPath, "rw"));
        } catch (IOException e) {
            throw new FCGIConnectException(e);
        }
    }

    /**
     * Create a FCGIConnection
     *
     * @throws FCGIConnectException
     */
    public FCGIConnection connect() throws FCGIConnectException {
        return doConnect();
    }

    protected Process doBind(Map env, String php, boolean includeJava) throws IOException {
        if (proc != null) return null;
        if (raPath == null) throw new IOException("No pipe name available.");
        // Set override hosts so that php does not try to start a VM.
        // The value itself doesn't matter, we'll pass the real value
        // via the (HTTP_)X_JAVABRIDGE_OVERRIDE_HOSTS header field
        // later.
        File home = null;
        if (php != null) try {
            home = ((new File(php)).getParentFile());
        } catch (Exception e) {
            Util.printStackTrace(e);
        }
        proc = processFactory.createFCGIProcess(new String[]{php, raPath}, includeJava, home, env);
        proc.start();
        return (Process) proc;
    }

    protected void waitForDaemon() throws UnknownHostException, InterruptedException {
        Thread.sleep(5000);
    }

    /**
     * Return the OS command used to start the FCGI process
     *
     * @return the fcgi start command.
     */
    public String getFcgiStartCommand(String base, String php_fcgi_max_requests) {
        String msg =
                "cd \"" + base + File.separator + Util.osArch + "-" + Util.osName + "\"\n" +
                        "set %REDIRECT_STATUS%=200\n" +
                        "set %X_JAVABRIDGE_OVERRIDE_HOSTS%=/\n" +
                        "set %PHP_FCGI_CHILDREN%=5\n" +
                        "set %PHP_FCGI_MAX_REQUESTS%=\"" + php_fcgi_max_requests + "\"\n" +
                        "\"c:\\Program Files\\PHP\\php-cgi.exe\" -v\n" +
                        ".\\launcher.exe \"c:\\Program Files\\PHP\\php-cgi.exe\" \"" + getPath() + "\"\n\n";
        return msg;
    }

    /**
     * Find a free socket port. After that {@link #setDynamicPort()} should be called
     *
     * @param select wether or not some hard-coded path should be used
     */
    public void findFreePort(boolean select) {
        try {
            if (select) {
                File testRafile = File.createTempFile("JavaBridge", ".socket");
                testRaPath = PREFIX + testRafile.getCanonicalPath();
                testRafile.delete();
            } else {
                testRaPath = FCGIUtil.FCGI_PIPE;
            }
        } catch (IOException e) {
            Util.printStackTrace(e);
        }
    }

    /**
     * Set the a default port, overriding the port selected by {@link #findFreePort(boolean)}
     */
    public void setDefaultPort() {
        raPath = FCGIUtil.FCGI_PIPE;
    }

    /**
     * Set the dynamic port selected by {@link #findFreePort(boolean)}
     */
    public void setDynamicPort() {
        raPath = testRaPath;
    }

    /**
     * Return the path selected by {@link #setDefaultPort()} or {@link #setDynamicPort()}
     *
     * @return the path
     */
    public String getPath() {
        return raPath;
    }

    /**
     * Return the channel name
     *
     * @return the channel name
     */
    public String toString() {
        return "ChannelName@" + (getPath() == null ? "" : getPath());
    }
}