/*
 * Copyright 2013-2020 Software Radio Systems Limited
 *
 * This file is part of srsLTE.
 *
 * srsLTE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * srsLTE 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 Affero General Public License for more details.
 *
 * A copy of the GNU Affero General Public License can be found in
 * the LICENSE file in the top-level directory of this distribution
 * and at http://www.gnu.org/licenses/.
 *
 */

#include "srsenb/hdr/parser.h"
#include <iostream>

namespace srsenb {

using namespace libconfig;

int parser::parse_section(std::string filename, parser::section* s)
{
  parser p(filename);
  p.add_section(s);
  return p.parse();
}

parser::parser(std::string filename_)
{
  filename = filename_;
}

void parser::add_section(parser::section* s)
{
  sections.push_back(s);
}

int parser::parse()
{
  // open file
  Config cfg;

  try {
    cfg.readFile(filename.c_str());
  } catch (const FileIOException& fioex) {
    std::cerr << "I/O error while reading file: " << filename << std::endl;
    return (-1);
  } catch (const ParseException& pex) {
    std::cerr << "Parse error at " << pex.getFile() << ":" << pex.getLine() << " - " << pex.getError() << std::endl;
    return (-1);
  }

  for (auto s : sections) {
    if (s->parse(cfg.getRoot())) {
      return -1;
    }
  }
  return 0;
}

parser::section::section(std::string name_)
{
  name          = std::move(name_);
  enabled_value = nullptr;
}

// Fields are allocated dynamically, free all fields added to the section
parser::section::~section()
{
  for (auto& field : fields) {
    delete field;
  }
}

void parser::section::add_field(field_itf* f)
{
  fields.push_back(f);
}

void parser::section::add_subsection(parser::section* s)
{
  sub_sections.push_back(s);
}

void parser::section::set_optional(bool* enabled_value_)
{
  enabled_value = enabled_value_;
}

int parser::section::parse(Setting& root)
{
  try {
    for (auto f : fields) {
      if (f->parse(root[name.c_str()])) {
        fprintf(stderr, "Error parsing field %s in section %s\n", f->get_name(), name.c_str());
        return -1;
      }
    }
    for (auto s : sub_sections) {
      if (s->parse(root[name.c_str()])) {
        fprintf(stderr, "Error parsing section %s\n", name.c_str());
        return -1;
      }
    }
    if (enabled_value) {
      *enabled_value = true;
    }
  } catch (const SettingNotFoundException& ex) {
    if (enabled_value) {
      *enabled_value = false;
      return 0;
    } else {
      std::cerr << "Error section " << name.c_str() << " not found." << std::endl;
      return -1;
    }
  }
  return 0;
}

} // namespace srsenb