/* -*- 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 CDMCaps_h_
#define CDMCaps_h_

#include "nsIThread.h"
#include "nsTArray.h"
#include "nsString.h"
#include "SamplesWaitingForKey.h"

#include "mozilla/Monitor.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/MediaKeyStatusMapBinding.h" // For MediaKeyStatus
#include "mozilla/dom/BindingDeclarations.h" // For Optional

namespace mozilla {

// CDM capabilities; what keys a CDMProxy can use.
// Must be locked to access state.
class CDMCaps {
public:
  CDMCaps();
  ~CDMCaps();

  struct KeyStatus {
    KeyStatus(const CencKeyId& aId,
              const nsString& aSessionId,
              dom::MediaKeyStatus aStatus)
      : mId(aId)
      , mSessionId(aSessionId)
      , mStatus(aStatus)
    {}
    KeyStatus(const KeyStatus& aOther)
      : mId(aOther.mId)
      , mSessionId(aOther.mSessionId)
      , mStatus(aOther.mStatus)
    {}
    bool operator==(const KeyStatus& aOther) const {
      return mId == aOther.mId &&
             mSessionId == aOther.mSessionId;
    };

    CencKeyId mId;
    nsString mSessionId;
    dom::MediaKeyStatus mStatus;
  };

  bool IsKeyUsable(const CencKeyId& aKeyId);

  // Returns true if key status changed,
  // i.e. the key status changed from usable to expired.
  bool SetKeyStatus(const CencKeyId& aKeyId,
                    const nsString& aSessionId,
                    const dom::Optional<dom::MediaKeyStatus>& aStatus);

  void GetKeyStatusesForSession(const nsAString& aSessionId,
                                nsTArray<KeyStatus>& aOutKeyStatuses);

  // Ensures all keys for a session are marked as 'unknown', i.e. removed.
  // Returns true if a key status was changed.
  bool RemoveKeysForSession(const nsString& aSessionId);

  // Notifies the SamplesWaitingForKey when key become usable.
  void NotifyWhenKeyIdUsable(const CencKeyId& aKey,
                             SamplesWaitingForKey* aSamplesWaiting);

private:

  struct WaitForKeys {
    WaitForKeys(const CencKeyId& aKeyId,
                SamplesWaitingForKey* aListener)
      : mKeyId(aKeyId)
      , mListener(aListener)
    {}
    CencKeyId mKeyId;
    RefPtr<SamplesWaitingForKey> mListener;
  };

  nsTArray<KeyStatus> mKeyStatuses;

  nsTArray<WaitForKeys> mWaitForKeys;

  // It is not safe to copy this object.
  CDMCaps(const CDMCaps&) = delete;
  CDMCaps& operator=(const CDMCaps&) = delete;
};

} // namespace mozilla

#endif
