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

#include "nsError.h"

#include "sdp/SdpMediaSection.h"
#include "sdp/SdpAttribute.h"

#include "transport/m_cpp_utils.h"

#include <string>
#include <map>
#include <vector>

namespace mozilla {
class SdpMediaSection;
class Sdp;

class SdpHelper {
 public:
  // Takes a std::string* into which error strings will be written for the
  // lifetime of the SdpHelper.
  explicit SdpHelper(std::string* errorDest) : mLastError(*errorDest) {}
  ~SdpHelper() {}

  nsresult GetComponent(const std::string& candidate, size_t* component);
  nsresult CopyTransportParams(size_t numComponents,
                               const SdpMediaSection& source,
                               SdpMediaSection* dest);
  bool AreOldTransportParamsValid(const Sdp& oldAnswer,
                                  const Sdp& offerersPreviousSdp,
                                  const Sdp& newOffer, size_t level);
  bool IceCredentialsDiffer(const SdpMediaSection& msection1,
                            const SdpMediaSection& msection2);

  bool MsectionIsDisabled(const SdpMediaSection& msection) const;
  static void DisableMsection(Sdp* sdp, SdpMediaSection* msection);

  // Maps each mid to the m-section that owns its bundle transport.
  // Mids that do not appear in an a=group:BUNDLE do not appear here.
  typedef std::map<std::string, const SdpMediaSection*> BundledMids;

  nsresult GetBundledMids(const Sdp& sdp, BundledMids* bundledMids);

  bool OwnsTransport(const Sdp& localSdp, uint16_t level, sdp::SdpType type);
  bool OwnsTransport(const SdpMediaSection& msection,
                     const BundledMids& bundledMids, sdp::SdpType type);
  void GetBundleGroups(const Sdp& sdp,
                       std::vector<SdpGroupAttributeList::Group>* groups) const;

  nsresult GetMidFromLevel(const Sdp& sdp, uint16_t level, std::string* mid);
  nsresult GetIdsFromMsid(const Sdp& sdp, const SdpMediaSection& msection,
                          std::vector<std::string>* streamId);
  nsresult GetMsids(const SdpMediaSection& msection,
                    std::vector<SdpMsidAttributeList::Msid>* msids);
  nsresult ParseMsid(const std::string& msidAttribute, std::string* streamId,
                     std::string* trackId);
  nsresult AddCandidateToSdp(Sdp* sdp, const std::string& candidate,
                             uint16_t level, const std::string& ufrag);
  nsresult SetIceGatheringComplete(Sdp* sdp, const std::string& ufrag);
  nsresult SetIceGatheringComplete(Sdp* sdp, uint16_t level,
                                   const std::string& ufrag);
  void SetDefaultAddresses(const std::string& defaultCandidateAddr,
                           uint16_t defaultCandidatePort,
                           const std::string& defaultRtcpCandidateAddr,
                           uint16_t defaultRtcpCandidatePort,
                           SdpMediaSection* msection);
  void SetupMsidSemantic(const std::vector<std::string>& msids, Sdp* sdp) const;

  std::string GetCNAME(const SdpMediaSection& msection) const;

  SdpMediaSection* FindMsectionByMid(Sdp& sdp, const std::string& mid) const;

  const SdpMediaSection* FindMsectionByMid(const Sdp& sdp,
                                           const std::string& mid) const;

  nsresult CopyStickyParams(const SdpMediaSection& source,
                            SdpMediaSection* dest);
  bool HasRtcp(SdpMediaSection::Protocol proto) const;
  static SdpMediaSection::Protocol GetProtocolForMediaType(
      SdpMediaSection::MediaType type);
  void AppendSdpParseErrors(
      const std::vector<std::pair<size_t, std::string> >& aErrors,
      std::string* aErrorString);

  static bool GetPtAsInt(const std::string& ptString, uint16_t* ptOutparam);

  void NegotiateAndAddExtmaps(
      const SdpMediaSection& remoteMsection,
      std::vector<SdpExtmapAttributeList::Extmap>& localExtensions,
      SdpMediaSection* localMsection);

  bool SdpMatch(const Sdp& sdp1, const Sdp& sdp2);
  nsresult ValidateTransportAttributes(const Sdp& aSdp, sdp::SdpType aType);

 private:
  std::string& mLastError;

  DISALLOW_COPY_ASSIGN(SdpHelper);
};
}  // namespace mozilla

#endif  // _SDPHELPER_H_