/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et 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_net_TRRQuery_h
#define mozilla_net_TRRQuery_h

namespace mozilla {
namespace net {

class TRRQuery : public AHostResolver {
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TRRQuery, override)

 public:
  TRRQuery(nsHostResolver* aHostResolver, nsHostRecord* aHostRecord)
      : mHostResolver(aHostResolver),
        mRecord(aHostRecord),
        mTrrLock("TRRQuery.mTrrLock") {}

  nsresult DispatchLookup(TRR* pushedTRR = nullptr);

  void Cancel();

  enum TRRState { INIT, STARTED, OK, FAILED };
  TRRState mTrrAUsed = INIT;
  TRRState mTrrAAAAUsed = INIT;

  AddrHostRecord::TRRSkippedReason mTRRAFailReason = AddrHostRecord::TRR_UNSET;
  AddrHostRecord::TRRSkippedReason mTRRAAAAFailReason =
      AddrHostRecord::TRR_UNSET;

  virtual LookupStatus CompleteLookup(
      nsHostRecord*, nsresult, mozilla::net::AddrInfo*, bool pb,
      const nsACString& aOriginsuffix,
      nsHostRecord::TRRSkippedReason aReason) override;
  virtual LookupStatus CompleteLookupByType(
      nsHostRecord*, nsresult, mozilla::net::TypeRecordResultType& aResult,
      uint32_t aTtl, bool pb) override;
  virtual nsresult GetHostRecord(const nsACString& host,
                                 const nsACString& aTrrServer, uint16_t type,
                                 uint16_t flags, uint16_t af, bool pb,
                                 const nsCString& originSuffix,
                                 nsHostRecord** result) override {
    if (!mHostResolver) {
      return NS_ERROR_FAILURE;
    }
    return mHostResolver->GetHostRecord(host, aTrrServer, type, flags, af, pb,
                                        originSuffix, result);
  }
  virtual nsresult TrrLookup_unlocked(
      nsHostRecord* rec, mozilla::net::TRR* pushedTRR = nullptr) override {
    if (!mHostResolver) {
      return NS_ERROR_FAILURE;
    }
    return mHostResolver->TrrLookup_unlocked(rec, pushedTRR);
  }
  virtual void MaybeRenewHostRecord(nsHostRecord* aRec) override {
    if (!mHostResolver) {
      return;
    }
    mHostResolver->MaybeRenewHostRecord(aRec);
  }

  mozilla::TimeDuration Duration() { return mTrrDuration; }

 private:
  ~TRRQuery() = default;
  RefPtr<nsHostResolver> mHostResolver;
  RefPtr<nsHostRecord> mRecord;

  Mutex mTrrLock;  // lock when accessing the mTrrA[AAA] pointers
  RefPtr<mozilla::net::TRR> mTrrA;
  RefPtr<mozilla::net::TRR> mTrrAAAA;
  RefPtr<mozilla::net::TRR> mTrrByType;

  uint8_t mTRRSuccess = 0;  // number of successful TRR responses

  mozilla::TimeDuration mTrrDuration;
  mozilla::TimeStamp mTrrStart;

  RefPtr<mozilla::net::AddrInfo> mFirstTRR;  // partial TRR storage
  nsresult mFirstTRRresult = NS_OK;
};

}  // namespace net
}  // namespace mozilla

#endif  // mozilla_net_TRRQuery_h