/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 Module:       FGInput.cpp
 Author:       Jon Berndt
 Date started: 12/02/98
 Purpose:      Manage output of sim parameters to file or stdout
 Called by:    FGSimExec

 ------------- Copyright (C) 1999  Jon S. Berndt (jon@jsbsim.org) -------------

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser General Public License as published by the Free Software
 Foundation; either version 2 of the License, or (at your option) any later
 version.

 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 Lesser General Public License for more
 details.

 You should have received a copy of the GNU Lesser General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 Place - Suite 330, Boston, MA  02111-1307, USA.

 Further information about the GNU Lesser General Public License can also be found on
 the world wide web at http://www.gnu.org.

FUNCTIONAL DESCRIPTION
--------------------------------------------------------------------------------
This is the place where you create output routines to dump data for perusal
later.

HISTORY
--------------------------------------------------------------------------------
12/02/98   JSB   Created

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#include "FGInput.h"
#include "FGState.h"
#include "FGFDMExec.h"

#include "input_output/FGfdmSocket.h"
#include "input_output/FGXMLElement.h"

#include <sstream>
#include <iomanip>
#include <cstdlib>

using namespace std;

namespace JSBSim {

static const char *IdSrc = "$Id$";
static const char *IdHdr = ID_INPUT;

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS IMPLEMENTATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

FGInput::FGInput(FGFDMExec* fdmex) : FGModel(fdmex)
{
  Name = "FGInput";
  sFirstPass = dFirstPass = true;
  socket = 0;
  port = 0;
  enabled = true;

  Debug(0);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

FGInput::~FGInput()
{
  delete socket;
  Debug(1);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

bool FGInput::InitModel(void)
{
  if (!FGModel::InitModel()) return false;

  return true;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//
// This function handles accepting input commands from the socket interface.
//

bool FGInput::Run(void)
{
  string line, token;
  size_t start=0, string_start=0, string_end=0;
  double value=0;
  FGPropertyManager* node=0;

  if (FGModel::Run()) return true; // fast exit if nothing to do
  if (port == 0) return false;      // Do nothing here if port not defined
                                    // return false if no error
  // This model DOES execute if "Exec->Holding"

  data = socket->Receive(); // get socket transmission if present

  if (data.size() > 0) {
    // parse lines
    while (1) {
      string_start = data.find_first_not_of("\r\n", start);
      if (string_start == string::npos) break;
      string_end = data.find_first_of("\r\n", string_start);
      if (string_end == string::npos) break;
      line = data.substr(string_start, string_end-string_start);
      if (line.size() == 0) break;

      // now parse individual line
      vector <string> tokens = split(line,' ');
  
      string command="", argument="", str_value="";
      if (tokens.size() > 0) {
        command = to_lower(tokens[0]);
        if (tokens.size() > 1) {
          argument = trim(tokens[1]);
          if (tokens.size() > 2) {
            str_value = trim(tokens[2]);
          }
        }
      }

      if (command == "set") {                   // SET PROPERTY

        node = PropertyManager->GetNode(argument);
        if (node == 0)
          socket->Reply("Unknown property\n");
        else {
          value = atof(str_value.c_str());
          node->setDoubleValue(value);
        }
        socket->Reply("");

      } else if (command == "get") {             // GET PROPERTY

        if (argument.size() == 0) {
          socket->Reply("No property argument supplied.\n");
          break;
        }
        try {
          node = PropertyManager->GetNode(argument);
        } catch(...) {
          socket->Reply("Badly formed property query\n");
          break;
        }
        if (node == 0) {
          if (FDMExec->Holding()) { // if holding can query property list
            string query = FDMExec->QueryPropertyCatalog(argument);
            socket->Reply(query);
          } else {
            socket->Reply("Must be in HOLD to search properties\n");
          }
        } else if (node > 0) {
          ostringstream buf;
          buf << argument << " = " << setw(12) << setprecision(6) << node->getDoubleValue() << endl;
          socket->Reply(buf.str());
        }

      } else if (command == "hold") {                  // PAUSE

        FDMExec->Hold();
        socket->Reply("");

      } else if (command == "resume") {             // RESUME

        FDMExec->Resume();
        socket->Reply("");

      } else if (command == "quit") {                   // QUIT

        // close the socket connection
        socket->Reply("");
        socket->Close();

      } else if (command == "info") {                   // INFO

        // get info about the sim run and/or aircraft, etc.
        ostringstream info;
        info << "JSBSim version: " << JSBSim_version << endl;
        info << "Config File version: " << needed_cfg_version << endl;
        info << "Aircraft simulated: " << Aircraft->GetAircraftName() << endl;
        info << "Simulation time: " << setw(8) << setprecision(3) << State->Getsim_time() << endl;
        socket->Reply(info.str());

      } else if (command == "help") {                   // HELP

        socket->Reply(
        " JSBSim Server commands:\n\n"
        "   get {property name}\n"
        "   set {property name} {value}\n"
        "   hold\n"
        "   resume\n"
        "   help\n"
        "   quit\n"
        "   info\n\n");

      } else {
        socket->Reply(string("Unknown command: ") +  token + string("\n"));
      }

      start = string_end;
    }
  }

  return false;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

bool FGInput::Load(Element* element)
{
  string type="", parameter="";
  string name="", fname="";
  string property;

  // if the input has already been set up, print a warning message and return
  if (port > 0) {
    cerr << "An input port has already been assigned for this run" << endl;
    return false;
  }

  port = int(element->GetAttributeValueAsNumber("port"));
  if (port == 0) {
    cerr << endl << "No port assigned in input element" << endl;
  } else {
    socket = new FGfdmSocket(port);
  }

  Debug(2);

  return true;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//    The bitmasked value choices are as follows:
//    unset: In this case (the default) JSBSim would only print
//       out the normally expected messages, essentially echoing
//       the config files as they are read. If the environment
//       variable is not set, debug_lvl is set to 1 internally
//    0: This requests JSBSim not to output any messages
//       whatsoever.
//    1: This value explicity requests the normal JSBSim
//       startup messages
//    2: This value asks for a message to be printed out when
//       a class is instantiated
//    4: When this value is set, a message is displayed when a
//       FGModel object executes its Run() method
//    8: When this value is set, various runtime state variables
//       are printed out periodically
//    16: When set various parameters are sanity checked and
//       a message is printed out when they go out of bounds

void FGInput::Debug(int from)
{
  string scratch="";

  if (debug_lvl <= 0) return;

  if (debug_lvl & 1) { // Standard console startup message output
    if (from == 0) { // Constructor
    }
    if (from == 2) {
    }
  }
  if (debug_lvl & 2 ) { // Instantiation/Destruction notification
    if (from == 0) cout << "Instantiated: FGInput" << endl;
    if (from == 1) cout << "Destroyed:    FGInput" << endl;
  }
  if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
  }
  if (debug_lvl & 8 ) { // Runtime state variables
  }
  if (debug_lvl & 16) { // Sanity checking
  }
  if (debug_lvl & 64) {
    if (from == 0) { // Constructor
      cout << IdSrc << endl;
      cout << IdHdr << endl;
    }
  }
}
}