/*
 * Copyright (c) 2008-2018 the MRtrix3 contributors.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at http://mozilla.org/MPL/2.0/
 *
 * MRtrix3 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.
 *
 * For more details, see http://www.mrtrix.org/
 */


#include "app.h"
#include "exception.h"
#include "file/config.h"
#include "debug.h"

#ifdef MRTRIX_AS_R_LIBRARY
# include "wrap_r.h"
#endif


namespace MR
{

  void display_exception_cmdline (const Exception& E, int log_level)
  {
    if (App::log_level >= log_level)
      for (size_t n = 0; n < E.description.size(); ++n)
        report_to_user_func (E.description[n], log_level);
  }

  bool __need_newline = false;


  namespace {

    inline const char* console_prefix (int type)
    {
      switch (type) {
        case 0: return "[ERROR] ";
        case 1: return "[WARNING] ";
        case 2: return "[INFO] ";
        case 3: return "[DEBUG] ";
        default: return "";
      }
    }

  }

  void cmdline_report_to_user_func (const std::string& msg, int type)
  {
    static constexpr const char* colour_format_strings[] = {
      "%s: %s%s\n",
      "%s: \033[01;31m%s%s\033[0m\n",
      "%s: \033[00;31m%s%s\033[0m\n",
      "%s: \033[00;32m%s%s\033[0m\n",
      "%s: \033[00;34m%s%s\033[0m\n"
    };

    if (__need_newline) {
      __print_stderr ("\n");
      __need_newline = false;
    }

    auto clamp = [](int t) { if (t < -1 || t > 3) t = -1; return t+1; };

    __print_stderr (printf (colour_format_strings[App::terminal_use_colour ? clamp(type) : 0],
          App::NAME.c_str(), console_prefix (type), msg.c_str()));
    if (type == 1 && App::fail_on_warn)
      throw Exception ("terminating due to request to fail on warning");
  }



  void cmdline_print_func (const std::string& msg)
  {
#ifdef MRTRIX_AS_R_LIBRARY
    Rprintf (msg.c_str());
#else
    std::cout << msg;
#endif
  }




  void (*print) (const std::string& msg) = cmdline_print_func;
  void (*report_to_user_func) (const std::string& msg, int type) = cmdline_report_to_user_func;
  void (*Exception::display_func) (const Exception& E, int log_level) = display_exception_cmdline;


  void check_app_exit_code()
  {
    if (App::exit_error_code)
      throw Exception ("Command performing delayed termination due to prior critical error");
  }

}

