// Copyright 2013 Google Inc. All Rights Reserved.

#ifndef WVCDM_CORE_CDM_ENGINE_H_
#define WVCDM_CORE_CDM_ENGINE_H_

#include "certificate_provisioning.h"
#include "oemcrypto_adapter.h"
#include "wv_cdm_types.h"

namespace wvcdm {

class CdmClientPropertySet;
class CdmSession;
class CryptoEngine;
class WvCdmEventListener;

typedef std::map<CdmSessionId, CdmSession*> CdmSessionMap;
typedef std::map<CdmKeySetId, CdmSessionId> CdmReleaseKeySetMap;

class CdmEngine {
 public:
  CdmEngine();
  virtual ~CdmEngine();

  // Session related methods
  CdmResponseType OpenSession(const CdmKeySystem& key_system,
                              const CdmClientPropertySet* property_set,
                              CdmSessionId* session_id);
  CdmResponseType CloseSession(const CdmSessionId& session_id);

  CdmResponseType OpenKeySetSession(const CdmKeySetId& key_set_id);
  CdmResponseType CloseKeySetSession(const CdmKeySetId& key_set_id);

  // License related methods
  // Construct a valid license request
  CdmResponseType GenerateKeyRequest(const CdmSessionId& session_id,
                                     const CdmKeySetId& key_set_id,
                                     const CdmInitData& init_data,
                                     const CdmLicenseType license_type,
                                     CdmAppParameterMap& app_parameters,
                                     CdmKeyMessage* key_request,
                                     std::string* server_url);

  // Accept license response and extract key info.
  CdmResponseType AddKey(const CdmSessionId& session_id,
                         const CdmKeyResponse& key_data,
                         CdmKeySetId* key_set_id);

  CdmResponseType RestoreKey(const CdmSessionId& session_id,
                             const CdmKeySetId& key_set_id);

  CdmResponseType CancelKeyRequest(const CdmSessionId& session_id);

  // Construct valid renewal request for the current session keys.
  CdmResponseType GenerateRenewalRequest(const CdmSessionId& session_id,
                                         CdmKeyMessage* key_request,
                                         std::string* server_url);

  // Accept renewal response and update key info.
  CdmResponseType RenewKey(const CdmSessionId& session_id,
                           const CdmKeyResponse& key_data);

  // Query system information
  CdmResponseType QueryStatus(CdmQueryMap* info);

  // Query session information
  virtual CdmResponseType QuerySessionStatus(const CdmSessionId& session_id,
                                             CdmQueryMap* key_info);

  // Query license information
  CdmResponseType QueryKeyStatus(const CdmSessionId& session_id,
                                 CdmQueryMap* key_info);

  // Query seesion control information
  CdmResponseType QueryKeyControlInfo(const CdmSessionId& session_id,
                                      CdmQueryMap* key_info);

  // Provisioning related methods
  CdmResponseType GetProvisioningRequest(CdmProvisioningRequest* request,
                                         std::string* default_url);

  CdmResponseType HandleProvisioningResponse(CdmProvisioningResponse& response);

  // Decryption and key related methods
  // Accept encrypted buffer and return decrypted data.
  CdmResponseType Decrypt(const CdmSessionId& session_id,
                          const CdmDecryptionParameters& parameters);

  // Is the key known to any session?
  bool IsKeyLoaded(const KeyId& key_id);
  bool FindSessionForKey(const KeyId& key_id, CdmSessionId* sessionId);

  // Event listener related methods
  bool AttachEventListener(const CdmSessionId& session_id,
                           WvCdmEventListener* listener);
  bool DetachEventListener(const CdmSessionId& session_id,
                           WvCdmEventListener* listener);

  // Parse a blob of multiple concatenated PSSH atoms to extract the first
  // widevine pssh
  static bool ExtractWidevinePssh(const CdmInitData& init_data,
                                  CdmInitData* output);

  // Timer expiration method
  void OnTimerEvent();

 private:
  // private methods
  bool ValidateKeySystem(const CdmKeySystem& key_system);

  void OnKeyReleaseEvent(const CdmKeySetId& key_set_id);

  // instance variables
  CdmSessionMap sessions_;
  CdmReleaseKeySetMap release_key_sets_;
  CertificateProvisioning cert_provisioning_;
  SecurityLevel cert_provisioning_requested_security_level_;

  CORE_DISALLOW_COPY_AND_ASSIGN(CdmEngine);
};

}  // namespace wvcdm

#endif  // WVCDM_CORE_CDM_ENGINE_H_