// rdrepld.cpp
//
// The Rivendell Replicator Daemon
//
//   (C) Copyright 2010-2023 Fred Gleason <fredg@paravelsystems.com>
//
//   This program is free software; you can redistribute it and/or modify
//   it under the terms of the GNU General Public License version 2 as
//   published by the Free Software Foundation.
//
//   This program is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//   GNU General Public License for more details.
//
//   You should have received a copy of the GNU General Public
//   License along with this program; if not, write to the Free Software
//   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//

#include <signal.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/wait.h>

#include <QApplication>

#include <dbversion.h>
#include <rdapplication.h>
#include <rdcart.h>
#include <rdconf.h>
#include <rdcmd_switch.h>
#include <rddb.h>
#include <rdescape_string.h>
#include <rdtempdirectory.h>

#include "citadelxds.h"
#include "rdrepld.h"
#include "ww1ipump.h"

void SigHandler(int signum)
{
  pid_t local_pid;

  switch(signum) {
  case SIGINT:
  case SIGTERM:
    RDDeletePid(RD_PID_DIR,"rdrepld.pid");
    exit(0);
    break;

  case SIGCHLD:
    local_pid=waitpid(-1,NULL,WNOHANG);
    while(local_pid>0) {
      local_pid=waitpid(-1,NULL,WNOHANG);
    }
    signal(SIGCHLD,SigHandler);
    return;
  }
}


MainObject::MainObject(QObject *parent)
  :QObject(parent)
{
  QString err_msg;
  RDApplication::ErrorType err_type=RDApplication::ErrorOk;

  debug=false;

  //
  // Open the Database
  //
  rda=static_cast<RDApplication *>(new RDCoreApplication("rdrepld","rdrepld",RDREPLD_USAGE,this));
  if(!rda->open(&err_msg,&err_type,false)) {
    fprintf(stderr,"rdrepld: %s\n",err_msg.toUtf8().constData());
    exit(1);
  }

  //
  // Read Command Options
  //
  for(unsigned i=0;i<rda->cmdSwitch()->keys();i++) {
    if(rda->cmdSwitch()->key(i)=="-d") {
      debug=true;
      rda->cmdSwitch()->setProcessed(i,true);
    }
    if(!rda->cmdSwitch()->processed(i)) {
      fprintf(stderr,"rdrepld: unknown command option \"%s\"\n",
	      rda->cmdSwitch()->key(i).toUtf8().constData());
      exit(2);
    }
  }

  //
  // Calculate Temporary Directory
  //
  repl_temp_dir=RDTempDirectory::basePath();

  if(qApp->arguments().size()!=1) {
    debug=true;
  }

  ::signal(SIGINT,SigHandler);
  ::signal(SIGTERM,SigHandler);
  ::signal(SIGCHLD,SigHandler);
  if(!RDWritePid(RD_PID_DIR,"rdrepld.pid")) {
    fprintf(stderr,"rdrepld: aborting - can't write pid file\n");
    exit(1);
  }

  //
  // Start the Main Loop
  //
  repl_loop_timer=new QTimer(this);
  repl_loop_timer->setSingleShot(true);
  connect(repl_loop_timer,SIGNAL(timeout()),this,SLOT(mainLoop()));
  repl_loop_timer->start(RD_RDREPL_SCAN_INTERVAL);

  rda->syslog(LOG_INFO,"started");
}


void MainObject::mainLoop()
{
  LoadReplicators();
  ProcessCarts();
  FreeReplicators();
  repl_loop_timer->start(RD_RDREPL_SCAN_INTERVAL);
}


void MainObject::ProcessCarts()
{
  QString sql;
  RDSqlQuery *q;
  RDSqlQuery *q1;
  QString repl_name;
  QString where;
  bool stale;

  for(unsigned i=0;i<repl_replicators.size();i++) {
    where="";
    repl_name=repl_replicators[i]->config()->name();
    sql=QString("select `GROUP_NAME` from `REPLICATOR_MAP` where ")+
      "`REPLICATOR_NAME`='"+RDEscapeString(repl_name)+"'";
    q=new RDSqlQuery(sql);
    while(q->next()) {
      where+=QString("(GROUP_NAME='")+
	RDEscapeString(q->value(0).toString())+"')||";
    }
    delete q;
    where=where.left(where.length()-2).trimmed();
    if(!where.isEmpty()) {
      sql=QString("select ")+
	"`NUMBER`,"+             // 00
	"`TYPE`,"+               // 01
	"`METADATA_DATETIME` "+  // 02
	"from `CART` where "+
	where;
      q=new RDSqlQuery(sql);
      while(q->next()) {
	sql=QString("select ")+
	  "`ID`,"+             // 00
	  "`ITEM_DATETIME` "+  // 01
	  "from `REPL_CART_STATE` where "+
	  "(`REPLICATOR_NAME`='"+RDEscapeString(repl_name)+"')&&"+
	  QString::asprintf("(`CART_NUMBER`=%u)",q->value(0).toUInt());
	q1=new RDSqlQuery(sql);
	if(q1->first()) {
	  stale=q->value(2).toDateTime()>q1->value(1).toDateTime();
	}
	else {
	  stale=true;
	}
	if(stale) {
	  if(repl_replicators[i]->processCart(q->value(0).toUInt())) {
	    if(q1->isValid()) {
	      sql=QString("update `REPL_CART_STATE` set ")+
		"`ITEM_DATETIME`=now() where "+
		QString::asprintf("`ID`=%u",q1->value(0).toUInt());
	    }
	    else {
	      sql=QString("insert into `REPL_CART_STATE` set ")+
		"`REPLICATOR_NAME`='"+RDEscapeString(repl_name)+"',"+
		QString::asprintf("`CART_NUMBER`=%u,",q->value(0).toUInt())+
		"`ITEM_DATETIME`=now()";
	    }
	    RDSqlQuery::apply(sql);
	  }
	}
	delete q1;
      }
      delete q;
    }
  }
}


void MainObject::LoadReplicators()
{
  QString sql;
  RDSqlQuery *q;
  ReplConfig *config;

  sql=QString("select ")+
    "`NAME`,"+                 // 00
    "`TYPE_ID`,"+              // 01
    "`FORMAT`,"+               // 02
    "`CHANNELS`,"+             // 03
    "`SAMPRATE`,"+             // 04
    "`BITRATE`,"+              // 05
    "`QUALITY`,"+              // 06
    "`URL`,"+                  // 07
    "`URL_USERNAME`,"+         // 08
    "`URL_PASSWORD`,"+         // 09
    "`ENABLE_METADATA`,"+      // 10
    "`NORMALIZATION_LEVEL` "+  // 11
    "from `REPLICATORS` where "+
    "`STATION_NAME`='"+RDEscapeString(rda->config()->stationName())+"'";
  q=new RDSqlQuery(sql);
  while(q->next()) {
    config=new ReplConfig();
    config->setName(q->value(0).toString());
    config->setType((RDReplicator::Type)q->value(1).toUInt());
    config->setFormat((RDSettings::Format)q->value(2).toUInt());
    config->setChannels(q->value(3).toUInt());
    config->setSampleRate(q->value(4).toUInt());
    config->setBitRate(q->value(5).toUInt());
    config->setQuality(q->value(6).toUInt());
    config->setUrl(q->value(7).toString());
    config->setUrlUsername(q->value(8).toString());
    config->
      setUrlPassword(QByteArray::fromBase64(q->value(9).toString().toUtf8()));
    config->setEnableMetadata(RDBool(q->value(10).toString()));
    config->setNormalizeLevel(q->value(11).toInt());
    switch(config->type()) {
    case RDReplicator::TypeCitadelXds:
      repl_replicators.push_back(new CitadelXds(config));
      break;

    case RDReplicator::TypeWw1Ipump:
      repl_replicators.push_back(new Ww1Ipump(config));
      break;

    case RDReplicator::TypeLast:
      break;
    }
    repl_replicators.back()->startProcess();
  }
  delete q;
}


void MainObject::FreeReplicators()
{
  for(unsigned i=0;i<repl_replicators.size();i++) {
    delete repl_replicators[i];
  }
  repl_replicators.clear();
}

int main(int argc,char *argv[])
{
  QCoreApplication a(argc,argv,false);
  new MainObject();
  return a.exec();
}