// SysfsRead.cxx

// SPDX-License-Identifier: GPL-3.0-or-later
// Author: Unai Blazquez <unaibg2000@gmail.com>

#include "SysfsRead.hpp"

#include <algorithm>
#include <fstream>

SysfsReader::SysfsReader(const std::filesystem::path& input_path)
    : m_path(input_path)
{
}

SysfsStatus SysfsReader::read_status() const
{
  std::ifstream input_file_stream(m_path);
  if (!input_file_stream.is_open())
  {
    return SysfsStatus::Unreachable;
  }
  std::stringstream buffer;
  buffer << input_file_stream.rdbuf();  // read entire stream into buffer
  std::string contents = buffer.str();

  trim_in_place(contents);  // clean input string
  // compare
  if (contents.empty())
  {
    return SysfsStatus::Empty;
  }
  if (contents == "1")
  {
    return SysfsStatus::Enabled;
  }
  if (contents == "error: temp too high")
  {
    return SysfsStatus::ErrorTempTooHigh;
  }
  return SysfsStatus::UnexpectedValue;
}

void SysfsReader::trim_in_place(std::string& string)
{
  // left trim
  string.erase(string.begin(),
               std::find_if(string.begin(), string.end(), [](unsigned char ch)
                            { return !std::isspace(ch); }));

  // right trim
  string.erase(std::find_if(string.rbegin(), string.rend(),
                            [](unsigned char ch) { return !std::isspace(ch); })
                   .base(),
               string.end());
}