/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_Headers_h
#define mozilla_dom_Headers_h

#include "mozilla/dom/HeadersBinding.h"

#include "nsClassHashtable.h"
#include "nsWrapperCache.h"

#include "InternalHeaders.h"

namespace mozilla {

class ErrorResult;

namespace dom {

template <typename K, typename V>
class Record;
class ByteStringSequenceSequenceOrByteStringByteStringRecord;
class OwningByteStringSequenceSequenceOrByteStringByteStringRecord;

/**
 * This Headers class is only used to represent the content facing Headers
 * object. It is actually backed by an InternalHeaders implementation. Gecko
 * code should NEVER use this, except in the Request and Response
 * implementations, where they must always be created from the backing
 * InternalHeaders object.
 */
class Headers final : public nsISupports, public nsWrapperCache {
  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(Headers)

  friend class Request;
  friend class Response;

 private:
  nsCOMPtr<nsISupports> mOwner;
  RefPtr<InternalHeaders> mInternalHeaders;

 public:
  explicit Headers(nsISupports* aOwner, InternalHeaders* aInternalHeaders)
      : mOwner(aOwner), mInternalHeaders(aInternalHeaders) {}

  explicit Headers(const Headers& aOther) = delete;

  static bool PrefEnabled(JSContext* cx, JSObject* obj);

  static already_AddRefed<Headers> Constructor(
      const GlobalObject& aGlobal,
      const Optional<ByteStringSequenceSequenceOrByteStringByteStringRecord>&
          aInit,
      ErrorResult& aRv);

  static already_AddRefed<Headers> Constructor(
      const GlobalObject& aGlobal,
      const OwningByteStringSequenceSequenceOrByteStringByteStringRecord& aInit,
      ErrorResult& aRv);

  static already_AddRefed<Headers> Create(
      nsIGlobalObject* aGlobalObject,
      const OwningByteStringSequenceSequenceOrByteStringByteStringRecord& aInit,
      ErrorResult& aRv);

  void Append(const nsACString& aName, const nsACString& aValue,
              ErrorResult& aRv) {
    mInternalHeaders->Append(aName, aValue, aRv);
  }

  void Delete(const nsACString& aName, ErrorResult& aRv) {
    mInternalHeaders->Delete(aName, aRv);
  }

  void Get(const nsACString& aName, nsACString& aValue,
           ErrorResult& aRv) const {
    mInternalHeaders->Get(aName, aValue, aRv);
  }

  void GetFirst(const nsACString& aName, nsACString& aValue,
                ErrorResult& aRv) const {
    mInternalHeaders->GetFirst(aName, aValue, aRv);
  }

  bool Has(const nsACString& aName, ErrorResult& aRv) const {
    return mInternalHeaders->Has(aName, aRv);
  }

  void Set(const nsACString& aName, const nsACString& aValue,
           ErrorResult& aRv) {
    mInternalHeaders->Set(aName, aValue, aRv);
  }

  uint32_t GetIterableLength() const {
    return mInternalHeaders->GetIterableLength();
  }
  const nsString GetKeyAtIndex(unsigned aIndex) const {
    return mInternalHeaders->GetKeyAtIndex(aIndex);
  }
  const nsString GetValueAtIndex(unsigned aIndex) const {
    return mInternalHeaders->GetValueAtIndex(aIndex);
  }

  // ChromeOnly
  HeadersGuardEnum Guard() const { return mInternalHeaders->Guard(); }

  void SetGuard(HeadersGuardEnum aGuard, ErrorResult& aRv) {
    mInternalHeaders->SetGuard(aGuard, aRv);
  }

  virtual JSObject* WrapObject(JSContext* aCx,
                               JS::Handle<JSObject*> aGivenProto) override;
  nsISupports* GetParentObject() const { return mOwner; }

 private:
  virtual ~Headers();

  InternalHeaders* GetInternalHeaders() const { return mInternalHeaders; }
};

}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_Headers_h