#ifndef UA_SECURECHANNEL_H_
#define UA_SECURECHANNEL_H_

#include "queue.h"
#include "ua_types.h"
#include "ua_transport_generated.h"
#include "ua_connection_internal.h"

struct UA_Session;
typedef struct UA_Session UA_Session;

struct SessionEntry {
    LIST_ENTRY(SessionEntry) pointers;
    UA_Session *session; // Just a pointer. The session is held in the session manager or the client
};

/* For chunked requests */
struct ChunkEntry {
    LIST_ENTRY(ChunkEntry) pointers;
    UA_UInt32 requestId;
    UA_Boolean invalid_message;
    UA_ByteString bytes;
};

/* For chunked responses */
typedef struct {
    UA_SecureChannel *channel;
    UA_UInt32 requestId;
    UA_UInt32 messageType;
    UA_UInt16 chunksSoFar;
    size_t messageSizeSoFar;
    UA_Boolean final;
    UA_Boolean abort;
} UA_ChunkInfo;

struct UA_SecureChannel {
    UA_MessageSecurityMode  securityMode;
    UA_ChannelSecurityToken securityToken; // the channelId is contained in the securityToken
    UA_ChannelSecurityToken nextSecurityToken; // the channelId is contained in the securityToken
    UA_AsymmetricAlgorithmSecurityHeader clientAsymAlgSettings;
    UA_AsymmetricAlgorithmSecurityHeader serverAsymAlgSettings;
    UA_ByteString  clientNonce;
    UA_ByteString  serverNonce;
    UA_UInt32      sequenceNumber;
    UA_Connection *connection;
    LIST_HEAD(session_pointerlist, SessionEntry) sessions;
    LIST_HEAD(chunk_pointerlist, ChunkEntry) chunks;
};

void UA_SecureChannel_init(UA_SecureChannel *channel);
void UA_SecureChannel_deleteMembersCleanup(UA_SecureChannel *channel);

UA_StatusCode UA_SecureChannel_generateNonce(UA_ByteString *nonce);

void UA_SecureChannel_attachSession(UA_SecureChannel *channel, UA_Session *session);
void UA_SecureChannel_detachSession(UA_SecureChannel *channel, UA_Session *session);
UA_Session * UA_SecureChannel_getSession(UA_SecureChannel *channel, UA_NodeId *token);

UA_StatusCode UA_SecureChannel_sendBinaryMessage(UA_SecureChannel *channel, UA_UInt32 requestId,
                                                  const void *content, const UA_DataType *contentType);

void UA_SecureChannel_revolveTokens(UA_SecureChannel *channel);

#endif /* UA_SECURECHANNEL_H_ */