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

package io.soluble.pjb.servlet;

/*
 * 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.
 */

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;

import io.soluble.pjb.bridge.JavaBridge;
import io.soluble.pjb.bridge.Request;
import io.soluble.pjb.bridge.Util;
import io.soluble.pjb.bridge.http.AbstractChannel;
import io.soluble.pjb.bridge.http.IContextFactory;

/**
 * @author jostb
 */
final class HttpContextRunner implements Serializable {
    private static final long serialVersionUID = 6280393106090501730L;
    private Request request;
    private InputStream in;
    private OutputStream out;
    private AbstractChannel channel;
    private IContextFactory ctx;

    public HttpContextRunner(AbstractChannel channel, IContextFactory ctx) {
        this.channel = channel;
        this.ctx = ctx;
    }

    private byte shortPathHeader;

    private int readLength() throws IOException {
        byte buf[] = new byte[1];
        in.read(buf);
        shortPathHeader = (byte) (0xFF & buf[0]);

        buf = new byte[2];
        in.read(buf);
        return (0xFF & buf[0]) | (0xFF00 & (buf[1] << 8));
    }

    private String readString(int length) throws IOException {
        byte buf[] = new byte[length];
        in.read(buf);
        return new String(buf, Util.ASCII);
    }

    private String readName() throws IOException {
        return readString(readLength());
    }

    /**
     * Sets a new Input/OutputStream into the bridge
     *
     * @param bridge the JavaBridge
     * @param in     the new InputStream
     * @param out    the new OutputStream
     */
    private void setIO(JavaBridge bridge, InputStream in, OutputStream out) {
        bridge.request.reset();
        bridge.in = in;
        bridge.out = out;
    }

    private boolean init() throws IOException {
        if (Util.logLevel > 4) Util.logDebug("starting a new ContextRunner " + this);
        out = channel.getOuptutStream();
        in = channel.getInputStream();

        int c = in.read();
        if (c != 0177) {

            if (c == -1) return false; // client has closed the connection

            try {
                out.write(0);
            } catch (IOException e) {
            }
            throw new IOException("Protocol violation");
        }
        out.write(0);
        out.flush(); // dummy write: avoid ack delay
        readName();
        JavaBridge bridge = ctx.getBridge();

        if (shortPathHeader != (byte) 0xFF) { // short path S1: no PUT request
            bridge.request = new Request(bridge);
            bridge.request.init(shortPathHeader);
        }
        setIO(bridge, in, out);
        this.request = bridge.request;

        ctx.initialize();
        return true;
    }

    /**
     * {@inheritDoc}
     */
    public void run() {
        try {
            if (init())
                request.handleRequests();
            else
                Util.warn("context runner init failed");
        } catch (IOException e) {
            if (Util.logLevel > 4) Util.printStackTrace(e);
        } catch (Exception e) {
            Util.printStackTrace(e);
        } finally {
            if (ctx != null) {
                ctx.destroy();
            }
            channel.shutdown();
        }
    }

}