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//
//  ========================================================================
//  Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package com.firefly.codec.http2.decode;

import java.nio.ByteBuffer;

import com.firefly.codec.http2.frame.DataFrame;
import com.firefly.codec.http2.frame.ErrorCode;
import com.firefly.codec.http2.frame.Flags;
import com.firefly.codec.http2.frame.GoAwayFrame;
import com.firefly.codec.http2.frame.HeadersFrame;
import com.firefly.codec.http2.frame.PingFrame;
import com.firefly.codec.http2.frame.PriorityFrame;
import com.firefly.codec.http2.frame.PushPromiseFrame;
import com.firefly.codec.http2.frame.ResetFrame;
import com.firefly.codec.http2.frame.SettingsFrame;
import com.firefly.codec.http2.frame.WindowUpdateFrame;
import com.firefly.utils.io.BufferUtils;
import com.firefly.utils.log.Log;
import com.firefly.utils.log.LogFactory;

/**
 * 
 * The base parser for the frame body of HTTP/2 frames.
 * 
 * 
 * Subclasses implement {@link #parse(ByteBuffer)} to parse the frame specific
 * body.
 * 
 *
 * @see Parser
 */
public abstract class BodyParser {
	private static Log log = LogFactory.getInstance().getLog("firefly-system");

	private final HeaderParser headerParser;
	private final Parser.Listener listener;

	protected BodyParser(HeaderParser headerParser, Parser.Listener listener) {
		this.headerParser = headerParser;
		this.listener = listener;
	}

	/**
	 * 
	 * Parses the body bytes in the given {@code buffer}; only the body bytes
	 * are consumed, therefore when this method returns, the buffer may contain
	 * unconsumed bytes.
	 * 
	 *
	 * @param buffer
	 *            the buffer to parse
	 * @return true if the whole body bytes were parsed, false if not enough
	 *         body bytes were present in the buffer
	 */
	public abstract boolean parse(ByteBuffer buffer);

	protected void emptyBody(ByteBuffer buffer) {
		connectionFailure(buffer, ErrorCode.PROTOCOL_ERROR.code, "invalid_frame");
	}

	protected boolean hasFlag(int bit) {
		return headerParser.hasFlag(bit);
	}

	protected boolean isPadding() {
		return headerParser.hasFlag(Flags.PADDING);
	}

	protected boolean isEndStream() {
		return headerParser.hasFlag(Flags.END_STREAM);
	}

	protected int getStreamId() {
		return headerParser.getStreamId();
	}

	protected int getBodyLength() {
		return headerParser.getLength();
	}

	protected void notifyData(DataFrame frame) {
		try {
			listener.onData(frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	protected void notifyHeaders(HeadersFrame frame) {
		try {
			listener.onHeaders(frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	protected void notifyPriority(PriorityFrame frame) {
		try {
			listener.onPriority(frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	protected void notifyReset(ResetFrame frame) {
		try {
			listener.onReset(frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	protected void notifySettings(SettingsFrame frame) {
		try {
			listener.onSettings(frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	protected void notifyPushPromise(PushPromiseFrame frame) {
		try {
			listener.onPushPromise(frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	protected void notifyPing(PingFrame frame) {
		try {
			listener.onPing(frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	protected void notifyGoAway(GoAwayFrame frame) {
		try {
			listener.onGoAway(frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	protected void notifyWindowUpdate(WindowUpdateFrame frame) {
		try {
			listener.onWindowUpdate(frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	protected boolean connectionFailure(ByteBuffer buffer, int error, String reason) {
		BufferUtils.clear(buffer);
		notifyConnectionFailure(error, reason);
		return false;
	}

	private void notifyConnectionFailure(int error, String reason) {
		try {
			listener.onConnectionFailure(error, reason);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}
}