/*
 * Copyright 2013 - 2016 Anton Tananaev (anton@traccar.org)
 *
 * 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.traccar.protocol;

import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.model.Position;

import java.net.SocketAddress;
import java.util.regex.Pattern;

public class LaipacProtocolDecoder extends BaseProtocolDecoder {

    public LaipacProtocolDecoder(LaipacProtocol protocol) {
        super(protocol);
    }

    private static final Pattern PATTERN = new PatternBuilder()
            .text("$AVRMC,")
            .expression("([^,]+),")              // identifier
            .number("(dd)(dd)(dd),")             // time
            .expression("([AVRPavrp]),")         // validity
            .number("(dd)(dd.d+),")              // latitude
            .expression("([NS]),")
            .number("(ddd)(dd.d+),")             // longitude
            .number("([EW]),")
            .number("(d+.d+),")                  // speed
            .number("(d+.d+),")                  // course
            .number("(dd)(dd)(dd),")             // date (ddmmyy)
            .expression("(.),")                  // type
            .expression("[^*]+").text("*")
            .number("(xx)")                      // checksum
            .compile();

    @Override
    protected Object decode(
            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

        String sentence = (String) msg;

        if (sentence.startsWith("$ECHK") && channel != null) {
            channel.write(sentence + "\r\n"); // heartbeat
            return null;
        }

        Parser parser = new Parser(PATTERN, sentence);
        if (!parser.matches()) {
            return null;
        }

        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
        if (deviceSession == null) {
            return null;
        }

        Position position = new Position();
        position.setProtocol(getProtocolName());
        position.setDeviceId(deviceSession.getDeviceId());

        DateBuilder dateBuilder = new DateBuilder()
                .setTime(parser.nextInt(), parser.nextInt(), parser.nextInt());

        String status = parser.next();
        position.setValid(status.toUpperCase().equals("A"));

        position.setLatitude(parser.nextCoordinate());
        position.setLongitude(parser.nextCoordinate());
        position.setSpeed(parser.nextDouble());
        position.setCourse(parser.nextDouble());

        dateBuilder.setDateReverse(parser.nextInt(), parser.nextInt(), parser.nextInt());
        position.setTime(dateBuilder.getDate());

        String type = parser.next();
        String checksum = parser.next();
        String response = null;

        if (type.equals("0") && Character.isLowerCase(status.charAt(0))) {
            response = "$EAVACK,0," + checksum;
            response += Checksum.nmea(response);
        } else if (type.equals("S") || type.equals("T")) {
            response = "$AVCFG,00000000,t*21";
        } else if (type.equals("3")) {
            response = "$AVCFG,00000000,d*31";
        } else if (type.equals("X") || type.equals("4")) {
            response = "$AVCFG,00000000,x*2D";
        }

        if (response != null && channel != null) {
            channel.write(response + "\r\n");
        }

        return position;
    }

}

@@ -23,9 +23,9 @@
  201
-6
+7
  Ant
@@ -3438,32 +3438,33 @@
 ser.next();%0A
+%0A
         
 String respo
@@ -3455,65 +3455,48 @@
     
-String response = null;%0A%0A        if (type.equals(%220%22) && 
+if (channel != null) %7B%0A%0A            if (
 Char
@@ -3538,32 +3538,43 @@
 ) %7B%0A            
+    String 
 response = %22$EAV
@@ -3577,17 +3577,28 @@
 $EAVACK,
-0
+%22 + type + %22
 ,%22 + che
@@ -3604,16 +3604,20 @@
 ecksum;%0A
+    
         
@@ -3657,38 +3657,91 @@
 ponse);%0A        
-%7D else
+        channel.write(response);%0A            %7D%0A%0A           
  if (type.equals
@@ -3777,35 +3777,42 @@
             
-response = 
+    channel.write(
 %22$AVCFG,0000
@@ -3821,18 +3821,23 @@
 00,t*21%22
+)
 ;%0A
+    
         
@@ -3875,35 +3875,42 @@
             
-response = 
+    channel.write(
 %22$AVCFG,0000
@@ -3919,18 +3919,23 @@
 00,d*31%22
+)
 ;%0A
+    
         
@@ -3997,27 +3997,34 @@
         
-response = 
+    channel.write(
 %22$AVCFG,
@@ -4037,16 +4037,17 @@
 00,x*2D%22
+)
 ;%0A      
@@ -4052,107 +4052,14 @@
     
-%7D%0A%0A
     
-    if (response != null && channel != null) %7B%0A            channel.write(response + %22%5Cr%5Cn%22);
+%7D%0A
 %0A   

Fix Laipac protocol acknowledgement