/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 TRRService_h_
#define TRRService_h_

#include "mozilla/Atomics.h"
#include "mozilla/DataStorage.h"
#include "nsHostResolver.h"
#include "nsIObserver.h"
#include "nsWeakReference.h"

class nsIPrefBranch;

namespace mozilla {
namespace net {

class TRRService
  : public nsIObserver
  , public nsITimerCallback
  , public nsSupportsWeakReference
  , public AHostResolver
{
public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIOBSERVER
  NS_DECL_NSITIMERCALLBACK

  TRRService();
  nsresult Init();
  nsresult Start();
  bool Enabled();

  uint32_t Mode() { return mMode; }
  bool AllowRFC1918() { return mRfc1918; }
  bool UseGET() { return mUseGET; }
  bool EarlyAAAA() { return mEarlyAAAA; }
  bool DisableIPv6() { return mDisableIPv6; }
  bool DisableECS() { return mDisableECS; }
  nsresult GetURI(nsCString &result);
  nsresult GetCredentials(nsCString &result);
  uint32_t GetRequestTimeout() { return mTRRTimeout; }

  LookupStatus CompleteLookup(nsHostRecord *, nsresult, mozilla::net::AddrInfo *, bool pb) override;
  void TRRBlacklist(const nsACString &host, bool privateBrowsing, bool aParentsToo);
  bool IsTRRBlacklisted(const nsACString &host, bool privateBrowsing, bool fullhost);

  bool MaybeBootstrap(const nsACString &possible, nsACString &result);

private:
  virtual  ~TRRService();
  nsresult ReadPrefs(const char *name);
  void GetPrefBranch(nsIPrefBranch **result);
  void MaybeConfirm();

  bool                      mInitialized;
  Atomic<uint32_t, Relaxed> mMode;
  Atomic<uint32_t, Relaxed> mTRRBlacklistExpireTime;
  Atomic<uint32_t, Relaxed> mTRRTimeout;

  Mutex mLock; // protects mPrivate* string
  nsCString mPrivateURI; // main thread only
  nsCString mPrivateCred; // main thread only
  nsCString mConfirmationNS;
  nsCString mBootstrapAddr;

  Atomic<bool, Relaxed> mWaitForCaptive; // wait for the captive portal to say OK before using TRR
  Atomic<bool, Relaxed> mRfc1918; // okay with local IP addresses in DOH responses?
  Atomic<bool, Relaxed> mCaptiveIsPassed; // set when captive portal check is passed
  Atomic<bool, Relaxed> mUseGET; // do DOH using GET requests (instead of POST)
  Atomic<bool, Relaxed> mEarlyAAAA; // allow use of AAAA results before A is in
  Atomic<bool, Relaxed> mDisableIPv6; // don't even try
  Atomic<bool, Relaxed> mDisableECS;  // disable EDNS Client Subnet in requests

  // TRR Blacklist storage
  RefPtr<DataStorage> mTRRBLStorage;
  Atomic<bool, Relaxed> mClearTRRBLStorage;

  enum ConfirmationState {
    CONFIRM_INIT = 0,
    CONFIRM_TRYING = 1,
    CONFIRM_OK = 2,
    CONFIRM_FAILED = 3
  };
  Atomic<ConfirmationState, Relaxed>  mConfirmationState;
  RefPtr<TRR> mConfirmer;
  nsCOMPtr<nsITimer> mRetryConfirmTimer;
  uint32_t mRetryConfirmInterval; // milliseconds until retry
};

extern TRRService *gTRRService;

} // namespace net
} // namespace mozilla

#endif // TRRService_h_