/*
 *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "test/explicit_key_value_config.h"

#include "absl/strings/string_view.h"
#include "api/field_trials_view.h"
#include "rtc_base/checks.h"

namespace webrtc {
namespace test {

ExplicitKeyValueConfig::ExplicitKeyValueConfig(absl::string_view s) {
  std::string::size_type field_start = 0;
  while (field_start < s.size()) {
    std::string::size_type separator_pos = s.find('/', field_start);
    RTC_CHECK_NE(separator_pos, std::string::npos)
        << "Missing separator '/' after field trial key.";
    RTC_CHECK_GT(separator_pos, field_start)
        << "Field trial key cannot be empty.";
    std::string key(s.substr(field_start, separator_pos - field_start));
    field_start = separator_pos + 1;

    RTC_CHECK_LT(field_start, s.size())
        << "Missing value after field trial key. String ended.";
    separator_pos = s.find('/', field_start);
    RTC_CHECK_NE(separator_pos, std::string::npos)
        << "Missing terminating '/' in field trial string.";
    RTC_CHECK_GT(separator_pos, field_start)
        << "Field trial value cannot be empty.";
    std::string value(s.substr(field_start, separator_pos - field_start));
    field_start = separator_pos + 1;

    key_value_map_[key] = value;
  }
  // This check is technically redundant due to earlier checks.
  // We nevertheless keep the check to make it clear that the entire
  // string has been processed, and without indexing past the end.
  RTC_CHECK_EQ(field_start, s.size());
}

std::string ExplicitKeyValueConfig::Lookup(absl::string_view key) const {
  auto it = key_value_map_.find(key);
  if (it != key_value_map_.end())
    return it->second;
  return "";
}

}  // namespace test
}  // namespace webrtc