#include "GwChannel.h"
#include <ActisenseReader.h>


class GwChannelMessageReceiver : public GwMessageFetcher{
  static const int bufferSize=GwBuffer::RX_BUFFER_SIZE+4;
  uint8_t buffer[bufferSize];
  uint8_t *writePointer=buffer;
  GwLog *logger;
  GwChannel *channel;
  GwChannel::NMEA0183Handler handler;
  public:
    GwChannelMessageReceiver(GwLog *logger,GwChannel *channel){
        this->logger=logger;
        this->channel=channel;
    }
    void setHandler(GwChannel::NMEA0183Handler handler){
        this->handler=handler;
    }
    virtual bool handleBuffer(GwBuffer *gwbuffer){
      size_t len=fetchMessageToBuffer(gwbuffer,buffer,bufferSize-4,'\n');
      writePointer=buffer+len;
      if (writePointer == buffer) return false;
      uint8_t *p;
      for (p=writePointer-1;p>=buffer && *p <= 0x20;p--){
        *p=0;
      }
      if (p > buffer){
        p++;
        *p=0x0d;
        p++;
        *p=0x0a;
        p++;
        *p=0;
      }
      for (p=buffer; *p != 0 && p < writePointer && *p <= 0x20;p++){}
      //very simple NMEA check
      if (*p != '!' && *p != '$'){
        LOG_DEBUG(GwLog::DEBUG,"unknown line [%d] - ignore: %s",id,(const char *)p);  
      }
      else{
        LOG_DEBUG(GwLog::DEBUG,"NMEA[%d]: %s",id,(const char *)p);
        if (channel->canReceive((const char *)p)){
            handler((const char *)p,id);
        }
      }
      writePointer=buffer;
      return true;
    }
};


GwChannel::GwChannel(GwLog *logger,
    String name,
    int sourceId,
    int maxSourceId){
    this->logger = logger;
    this->name=name;
    this->sourceId=sourceId;
    this->maxSourceId=maxSourceId;
    this->impl=NULL;
    this->receiver=new GwChannelMessageReceiver(logger,this);
    this->actisenseReader=NULL;
}
void GwChannel::begin(
    bool enabled,
    bool nmeaOut,
    bool nmeaIn,
    String readFilter,
    String writeFilter,
    bool seaSmartOut,
    bool toN2k,
    bool readActisense,
    bool writeActisense)
{
    this->enabled = enabled;
    this->NMEAout = nmeaOut;
    this->NMEAin = nmeaIn;
    this->readFilter=readFilter.isEmpty()?
        NULL:
        new GwNmeaFilter(readFilter);
    this->writeFilter=writeFilter.isEmpty()?
        NULL:
        new GwNmeaFilter(writeFilter);
    this->seaSmartOut=seaSmartOut;
    this->toN2k=toN2k;
    this->readActisense=readActisense;
    this->writeActisense=writeActisense;
    if (impl && readActisense){
        channelStream=impl->getStream(false);
        if (! channelStream) {
            this->readActisense=false;
            this->writeActisense=false;
            LOG_DEBUG(GwLog::ERROR,"unable to read actisnse on %s",name.c_str());
        }
        else{
            this->actisenseReader= new tActisenseReader();
            actisenseReader->SetReadStream(channelStream);         
        }
    }
    if (nmeaIn || readActisense){
        this->countIn=new GwCounter<String>(String("count")+name+String("in"));
    }
    if (nmeaOut || seaSmartOut || writeActisense){
        this->countOut=new GwCounter<String>(String("count")+name+String("out"));
    }
}
void GwChannel::setImpl(GwChannelInterface *impl){
    this->impl=impl;
}
void GwChannel::updateCounter(const char *msg, bool out)
{
    char key[7];
    key[0]=0;
    if (msg[0] == '$')
    {
        for (int i=0;i<6 && msg[i] != 0;i++){
            if (i>=3) {
                if (isalnum(msg[i]))key[i-3]=msg[i];
                else key[i-3]='_';
            }
            key[i-2]=0;
        }
        key[3] = 0;
    }
    else if (msg[0] == '!')
    {
        for (int i=0;i<6 && msg[i] != 0;i++){
            if (i>=1) {
                if (isalnum(msg[i]))key[i-1]=msg[i];
                else key[i-1]='_';
            }
            key[i]=0;
        }
        key[5] = 0;
    }
    else{
        return;
    }
    if (key[0] == 0) return;
    if (out){
        if (countOut) countOut->add(key);
    }
    else{
        if (countIn) countIn->add(key);
    }
}

bool GwChannel::canSendOut(const char *buffer, bool isSeasmart){
    if (! enabled || ! impl) return false;
    if (readActisense) return false;
    if (! isSeasmart && ! NMEAout) return false;
    if (isSeasmart && ! seaSmartOut) return false;
    if (writeFilter && ! writeFilter->canPass(buffer)) return false;
    return true;
}

bool GwChannel::canReceive(const char *buffer){
    if (! enabled) return false;
    if (! NMEAin) return false;
    if (readFilter && ! readFilter->canPass(buffer)) return false;
    updateCounter(buffer,false);
    return true;
}

int GwChannel::getJsonSize(){
    int rt=JSON_OBJECT_SIZE(6);
    if (countIn) rt+=countIn->getJsonSize();
    if (countOut) rt+=countOut->getJsonSize();
    return rt;
}
void GwChannel::toJson(GwJsonDocument &doc){
    JsonObject jo=doc.createNestedObject("ch"+name);
    jo["id"]=sourceId;
    jo["max"]=maxSourceId;
    if (countOut) countOut->toJson(doc);
    if (countIn) countIn->toJson(doc);
}
String GwChannel::toString(){
    String rt="CH"+name+"("+sourceId+"):";
    rt+=enabled?"[ena]":"[dis]";
    rt+=NMEAin?"in,":"";
    rt+=NMEAout?"out,":"";
    rt+=String("RF:") + (readFilter?readFilter->toString():"[]");
    rt+=String("WF:") + (writeFilter?writeFilter->toString():"[]");
    rt+=String(",")+ (toN2k?"n2k":"");
    rt+=String(",")+ (seaSmartOut?"SM":"");
    rt+=String(",")+(readActisense?"AR":"");
    rt+=String(",")+(writeActisense?"AW":"");
    return rt;
}
void GwChannel::loop(bool handleRead, bool handleWrite){
    if (! enabled || ! impl) return;
    impl->loop(handleRead,handleWrite);
}
void GwChannel::readMessages(GwChannel::NMEA0183Handler handler){
    if (! enabled || ! impl) return;
    if (readActisense || ! NMEAin) return;
    receiver->id=sourceId; 
    receiver->setHandler(handler);
    impl->readMessages(receiver);
}
void GwChannel::sendToClients(const char *buffer, int sourceId, bool isSeasmart){
    if (! impl) return;
    if (canSendOut(buffer,isSeasmart)){
        if(impl->sendToClients(buffer,sourceId)){
            updateCounter(buffer,true);
        }
    }
}
void GwChannel::parseActisense(N2kHandler handler){
    if (!enabled || ! impl || ! readActisense || ! actisenseReader) return;
    tN2kMsg N2kMsg;

    while (actisenseReader->GetMessageFromStream(N2kMsg)) {
      if(countIn) countIn->add(String(N2kMsg.PGN));
      handler(N2kMsg,sourceId);
    }
}

void GwChannel::sendActisense(const tN2kMsg &msg, int sourceId){
    if (!enabled || ! impl || ! writeActisense || ! channelStream) return;
    //currently actisense only for channels with a single source id
    //so we can check it here
    if (maxSourceId < 0 && this->sourceId == sourceId) return;
    if (sourceId >= this->sourceId && sourceId <= maxSourceId) return;
    if(countOut) countOut->add(String(msg.PGN)); 
    msg.SendInActisenseFormat(channelStream);
}

bool GwChannel::overlaps(const GwChannel *other) const{
    if (maxSourceId < 0){
        if (other->maxSourceId < 0) return sourceId == other->sourceId;
        return (other->sourceId <= sourceId && other->maxSourceId >= sourceId);
    }
    if (other->maxSourceId < 0){
        return other->sourceId >= sourceId && other->sourceId <= maxSourceId;
    }
    if (other->maxSourceId < sourceId) return false;
    if (other->sourceId > maxSourceId) return false;
    return true;
}

unsigned long GwChannel::countRx(){
    if (! countIn) return 0UL;
    return countIn->getGlobal();
}
unsigned long GwChannel::countTx(){
    if (! countOut) return 0UL;
    return countOut->getGlobal();
}