#include <arc/validate/command-line.hxx>

namespace arc::validate
{

  command_line_t
  parse_command_line(std::vector<std::string> const& args)
  {
    command_line_t command_line;

    bool only_files{false};

    for (auto it = args.begin(); it != args.end(); ++it) {
      auto const& option = *it;

      // fixme: should empty options be an error?
      //
      if (option.size() < 1) {
        continue;
      }

      if (only_files || '-' != option[0] || 1 == option.size()) {
        throw command_line_error_t{"invalid file argument '" + option + "'"};
      }

      if ("--" == option) {
        only_files = true;
        continue;
      }

      if ("--version" == option) {
        command_line.print_version = true;
        continue;
      }

      if ("--help" == option) {
        command_line.print_usage = true;
        continue;
      }

      if ("--print-information" == option) {
        command_line.print_information = true;
        continue;
      }

      if ("--print-warnings" == option) {
        command_line.print_warnings = true;
        continue;
      }

      if ("--print-success" == option) {
        command_line.print_success = true;
        continue;
      }

      if ("--print-failure" == option) {
        command_line.print_failure = true;
        continue;
      }

      if ("--verbose" == option) {
        command_line.print_information = true;
        command_line.print_warnings = true;
        command_line.print_success = true;
        command_line.print_failure = true;
        continue;
      }

      if ("-i" == option || "--include" == option) {
        ++it;

        if (it == args.end()) {
          throw command_line_error_t{"missing argument to '--include'"};
        }

        if (!command_line.exclude.empty()) {
          throw command_line_error_t{"cannot specify both `-i, --include` and `-e, --exclude`"};
        }

        command_line.include.emplace(*it);
        continue;
      }

      if ("-e" == option || "--exclude" == option) {
        ++it;

        if (it == args.end()) {
          throw command_line_error_t{"missing argument to '--exclude'"};
        }

        if (!command_line.include.empty()) {
          throw command_line_error_t{"cannot specify both `-i, --include` and `-e, --exclude`"};
        }

        command_line.exclude.emplace(*it);
        continue;
      }

      if ("-l" == option || "--list" == option) {
        command_line.list = true;
        continue;
      }

      throw command_line_error_t{"unrecognized option '" + option + "'"};
    }


    return command_line;

  }

}