#include "tlbmc/configs/proto_config_parser.h"

#include <stdint.h>

#include <fstream>
#include <memory>

#include "absl/log/log.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "resource.pb.h"
#include "google/protobuf/io/zero_copy_stream_impl.h"
#include "google/protobuf/text_format.h"

namespace milotic_tlbmc {

using ::google::protobuf::TextFormat;
using ::google::protobuf::io::IstreamInputStream;

template <typename T>
static T GetConfigFromProto(absl::string_view config_path) {
  std::ifstream config_file(config_path.data());
  if (!config_file.is_open()) {
    LOG(WARNING) << "Failed to open config file at '" << config_path
                 << "'. Using default config.";
    return T();
  }
  T config;
  IstreamInputStream istream_source(&config_file);
  if (!TextFormat::Parse(&istream_source, &config)) {
    LOG(WARNING) << "Failed to parse config from file: '" << config_path
                 << "'. Using default config.";
    return T();
  }
  return config;
}

void ProtoConfigParser::LoadProtoConfigs() {
  data_store_.software_metrics_configs =
      GetConfigFromProto<SoftwareMetricsConfig>(
          absl::StrCat(config_path_, "software_metrics_config.textproto"));
}

SoftwareMetricsConfig ProtoConfigParser::GetSoftwareMetricsConfig() const {
  return data_store_.software_metrics_configs;
}

std::unique_ptr<ProtoConfigParser> ProtoConfigParser::Create(
    absl::string_view config_path) {
  return std::make_unique<ProtoConfigParser>(config_path);
}
}  // namespace milotic_tlbmc