//
// $Id: ObsFileFinder.cpp,v 1.1 2001/10/24 14:46:58 greenlee Exp $
//
// File: ObsFileFinder.cpp
// Purpose: Implementation for ObsFileFinder package class.
// Created: 23-Oct-2001   Herb Greenlee
//
// $Revision: 1.1 $
//
//

// Include files

#include <iostream>
#include <fstream>
#include "gtrbase/ObsFileFinder.hpp"

using std::string;
using std::ifstream;
using std::cout;
using std::endl;

//**********************************************************************
// Static data.
//**********************************************************************

char* ObsFileFinder::_package_dirs[] = {"cft_obs/dat",
					"smt_path/dat",
					"gtrprop/dat",
					"gtr_find/dat",
					0};

//**********************************************************************
// Local methods.
//**********************************************************************

namespace {

  bool exist_file(const string& name)
  {
    ifstream file(name.c_str());
    bool result = file.good() && file.is_open();
    return result;
  }
}

//**********************************************************************
// Static methods
//**********************************************************************

string ObsFileFinder::find(const string& obsname) {

  // If obsname is already an absolute path, do nothing.

  if(obsname[0] == '/')
    return obsname;

  // Check if obsname is accessible as is (i.e. it is in current directory).

  if(exist_file(obsname))
    return obsname;

  // File not found in current directory.  

  cout << obsname << " -> ";

  // Search private test release packages (if defined).

  const char* srt_dir = getenv("SRT_PRIVATE_CONTEXT");
  if(srt_dir != 0 && *srt_dir != 0) {

    // Loop over packages.

    string base(srt_dir);
    for(char** s = &_package_dirs[0]; *s != 0; ++s) {
      string file = base + '/' + string(*s) + '/' + obsname;
      if(exist_file(file)) {
	cout << file << endl;
	return file;
      }
    }
  }

  // Search public release packages.

  srt_dir = getenv("SRT_PUBLIC_CONTEXT");
  if(srt_dir != 0 && *srt_dir != 0) {

    // Loop over packages.

    string base(srt_dir);
    for(char** s = &_package_dirs[0]; *s != 0; ++s) {
      string file = base + '/' + string(*s) + '/' + obsname;
      if(exist_file(file)) {
	cout << file << endl;
	return file;
      }
    }
  }

  // Still didn't find it?

  cout << "(not found)" << endl;
  return obsname;
}