/**
*    Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior
*    University
* 
*    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.openflow.protocol;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ConcurrentHashMap;

import net.floodlightcontroller.core.FloodlightContext;
import net.floodlightcontroller.core.IFloodlightProviderService;
import net.floodlightcontroller.core.IOFSwitch;
import net.onrc.onos.core.packet.Ethernet;

import org.jboss.netty.buffer.ChannelBuffer;
import org.openflow.util.HexString;
import org.openflow.util.U16;
import org.openflow.util.U32;
import org.openflow.util.U8;

/**
 * The base class for all OpenFlow protocol messages. This class contains the
 * equivalent of the ofp_header which is present in all OpenFlow messages.
 *
 * @author David Erickson (daviderickson@cs.stanford.edu) - Feb 3, 2010
 * @author Rob Sherwood (rob.sherwood@stanford.edu) - Feb 3, 2010
 */
public class OFMessage {
    public static byte OFP_VERSION = 0x01;
    public static int MINIMUM_LENGTH = 8;

    protected byte version;
    protected OFType type;
    protected short length;
    protected int xid;
    
    private ConcurrentHashMap<String, Object> storage;
    
    public OFMessage() {
        storage = null;
        this.version = OFP_VERSION;
    }
    
    protected synchronized ConcurrentHashMap<String, Object> getMessageStore() {
        if (storage == null) {
            storage = new ConcurrentHashMap<String, Object>();
        }
        return storage;
    }

    /**
     * Get the length of this message
     *
     * @return
     */
    public short getLength() {
        return length;
    }

    /**
     * Get the length of this message, unsigned
     *
     * @return
     */
    public int getLengthU() {
        return U16.f(length);
    }

    /**
     * Set the length of this message
     *
     * @param length
     */
    public OFMessage setLength(short length) {
        this.length = length;
        return this;
    }

    /**
     * Set the length of this message, unsigned
     *
     * @param length
     */
    public OFMessage setLengthU(int length) {
        this.length = U16.t(length);
        return this;
    }

    /**
     * Get the type of this message
     *
     * @return
     */
    public OFType getType() {
        return type;
    }

    /**
     * Set the type of this message
     *
     * @param type
     */
    public void setType(OFType type) {
        this.type = type;
    }

    /**
     * Get the OpenFlow version of this message
     *
     * @return
     */
    public byte getVersion() {
        return version;
    }

    /**
     * Set the OpenFlow version of this message
     *
     * @param version
     */
    public void setVersion(byte version) {
        this.version = version;
    }

    /**
     * Get the transaction id of this message
     *
     * @return
     */
    public int getXid() {
        return xid;
    }

    /**
     * Set the transaction id of this message
     *
     * @param xid
     */
    public void setXid(int xid) {
        this.xid = xid;
    }

    /**
     * Read this message off the wire from the specified ByteBuffer
     * @param data
     */
    public void readFrom(ChannelBuffer data) {
        this.version = data.readByte();
        this.type = OFType.valueOf(data.readByte());
        this.length = data.readShort();
        this.xid = data.readInt();
    }

    /**
     * Write this message's binary format to the specified ByteBuffer
     * @param data
     */
    public void writeTo(ChannelBuffer data) {
        data.writeByte(version);
        data.writeByte(type.getTypeValue());
        data.writeShort(length);
        data.writeInt(xid);
    }

    /**
     * Returns a summary of the message
     * @return "ofmsg=v=$version;t=$type:l=$len:xid=$xid"
     */
    public String toString() {
        return "ofmsg" +
            ":v=" + U8.f(this.getVersion()) +
            ";t=" + this.getType() +
            ";l=" + this.getLengthU() +
            ";x=" + U32.f(this.getXid());
    }

    @Override
    public int hashCode() {
        final int prime = 97;
        int result = 1;
        result = prime * result + length;
        result = prime * result + ((type == null) ? 0 : type.hashCode());
        result = prime * result + version;
        result = prime * result + xid;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof OFMessage)) {
            return false;
        }
        OFMessage other = (OFMessage) obj;
        if (length != other.length) {
            return false;
        }
        if (type == null) {
            if (other.type != null) {
                return false;
            }
        } else if (!type.equals(other.type)) {
            return false;
        }
        if (version != other.version) {
            return false;
        }
        if (xid != other.xid) {
            return false;
        }
        return true;
    }
    
    public static String getDataAsString(IOFSwitch sw, OFMessage msg, FloodlightContext cntx) {

        Ethernet eth;
        StringBuffer sb =  new StringBuffer("");

        DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss.SSS");
        Date date = new Date();

        sb.append(dateFormat.format(date));
        sb.append("      ");

        switch (msg.getType()) {
            case PACKET_IN:
                OFPacketIn pktIn = (OFPacketIn) msg;
                sb.append("packet_in          [ ");
                sb.append(sw.getStringId());
                sb.append(" -> Controller");
                sb.append(" ]");

                sb.append("\ntotal length: ");
                sb.append(pktIn.getTotalLength());
                sb.append("\nin_port: ");
                sb.append(pktIn.getInPort());
                sb.append("\ndata_length: ");
                sb.append(pktIn.getTotalLength() - OFPacketIn.MINIMUM_LENGTH);
                sb.append("\nbuffer: ");
                sb.append(pktIn.getBufferId());

                // If the conext is not set by floodlight, then ignore.
                if (cntx != null) {
                // packet type  icmp, arp, etc.
                    eth = IFloodlightProviderService.bcStore.get(cntx,
                            IFloodlightProviderService.CONTEXT_PI_PAYLOAD);
                    if (eth != null)
                           sb.append(eth.toString());
                }
                break;

            case PACKET_OUT:
                OFPacketOut pktOut = (OFPacketOut) msg;
                sb.append("packet_out         [ ");
                sb.append("Controller -> ");
                sb.append(HexString.toHexString(sw.getId()));
                sb.append(" ]");

                sb.append("\nin_port: ");
                sb.append(pktOut.getInPort());
                sb.append("\nactions_len: ");
                sb.append(pktOut.getActionsLength());
                if (pktOut.getActions() != null) {
                    sb.append("\nactions: ");
                    sb.append(pktOut.getActions().toString());
                }
                break;

            case FLOW_MOD:
                OFFlowMod fm = (OFFlowMod) msg;
                sb.append("flow_mod           [ ");
                sb.append("Controller -> ");
                sb.append(HexString.toHexString(sw.getId()));
                sb.append(" ]");

                // If the conext is not set by floodlight, then ignore.
                if (cntx != null) {
                    eth = IFloodlightProviderService.bcStore.get(cntx,
                        IFloodlightProviderService.CONTEXT_PI_PAYLOAD);
                    if (eth != null)
                        sb.append(eth.toString());
                }

                sb.append("\nADD: cookie: ");
                sb.append(fm.getCookie());
                sb.append(" idle: ");
                sb.append(fm.getIdleTimeout());
                sb.append(" hard: ");
                sb.append(fm.getHardTimeout());
                sb.append(" pri: ");
                sb.append(fm.getPriority());
                sb.append(" buf: ");
                sb.append(fm.getBufferId());
                sb.append(" flg: ");
                sb.append(fm.getFlags());
                if (fm.getActions() != null) {
                    sb.append("\nactions: ");
                    sb.append(fm.getActions().toString());
                }
                break;

            default:
                sb.append("[Unknown Packet]");
        }

        sb.append("\n\n");
        return sb.toString();

    }

    public static byte[] getData(IOFSwitch sw, OFMessage msg, FloodlightContext cntx) {
        return OFMessage.getDataAsString(sw, msg, cntx).getBytes();
    }
}