#pragma once

#include <map>

#include <string>

#include <vector>

#include "absl/container/btree_map.h"

#include "absl/strings/string_view.h"

#include "absl/types/optional.h"

#include "header_map.h"

namespace Envoy {

namespace Http {

namespace Utility {

// TODO(jmarantz): this should probably be a proper class, with methods to serialize

// using proper formatting. Perhaps similar to

// https://github.com/apache/incubator-pagespeed-mod/blob/master/pagespeed/kernel/http/query_params.h

using QueryParams = std::map<std::string, std::string>;

using QueryParamsVector = std::vector<std::pair<std::string, std::string>>;

class QueryParamsMulti {

private:

  absl::btree_map<std::string, std::vector<std::string>> data_;

public:

  void remove(absl::string_view key);

  void add(absl::string_view key, absl::string_view value);

  void overwrite(absl::string_view key, absl::string_view value);

  std::string toString();

  std::string replaceQueryString(const HeaderString& path);

  absl::optional<std::string> getFirstValue(absl::string_view key) const;

  const absl::btree_map<std::string, std::vector<std::string>>& data() { return data_; }

  static QueryParamsMulti parseParameters(absl::string_view data, size_t start, bool decode_params);

  static QueryParamsMulti parseQueryString(absl::string_view url);

  static QueryParamsMulti parseAndDecodeQueryString(absl::string_view url);

};

} // namespace Utility

} // namespace Http

} // namespace Envoy