#include "ua_util.h"
#include "ua_session.h"
#include "ua_statuscodes.h"

UA_Session anonymousSession = {
    .clientDescription =  {.applicationUri = {-1, UA_NULL}, .productUri = {-1, UA_NULL},
                           .applicationName = {.locale = {-1, UA_NULL}, .text = {-1, UA_NULL}},
                           .applicationType = UA_APPLICATIONTYPE_CLIENT,
                           .gatewayServerUri = {-1, UA_NULL}, .discoveryProfileUri = {-1, UA_NULL},
                           .discoveryUrlsSize = -1, .discoveryUrls = UA_NULL},
    .sessionName = {sizeof("Anonymous Session")-1, (UA_Byte*)"Anonymous Session"},
    .authenticationToken = {.namespaceIndex = 0, .identifierType = UA_NODEIDTYPE_NUMERIC,
                            .identifier.numeric = 0}, 
    .sessionId = {.namespaceIndex = 0, .identifierType = UA_NODEIDTYPE_NUMERIC, .identifier.numeric = 0},
    .maxRequestMessageSize = UA_UINT32_MAX, .maxResponseMessageSize = UA_UINT32_MAX,
    .timeout = UA_INT64_MAX, .validTill = UA_INT64_MAX, .channel = UA_NULL,
    .continuationPoints = {UA_NULL}};

UA_Session adminSession = {
    .clientDescription =  {.applicationUri = {-1, UA_NULL}, .productUri = {-1, UA_NULL},
                           .applicationName = {.locale = {-1, UA_NULL}, .text = {-1, UA_NULL}},
                           .applicationType = UA_APPLICATIONTYPE_CLIENT,
                           .gatewayServerUri = {-1, UA_NULL}, .discoveryProfileUri = {-1, UA_NULL},
                           .discoveryUrlsSize = -1, .discoveryUrls = UA_NULL},
    .sessionName = {sizeof("Administrator Session")-1, (UA_Byte*)"Administrator Session"},
    .authenticationToken = {.namespaceIndex = 0, .identifierType = UA_NODEIDTYPE_NUMERIC,
                            .identifier.numeric = 1},
    .sessionId = {.namespaceIndex = 0, .identifierType = UA_NODEIDTYPE_NUMERIC, .identifier.numeric = 1},
    .maxRequestMessageSize = UA_UINT32_MAX, .maxResponseMessageSize = UA_UINT32_MAX,
    .timeout = UA_INT64_MAX, .validTill = UA_INT64_MAX, .channel = UA_NULL,
    .continuationPoints = {UA_NULL}};

void UA_Session_init(UA_Session *session) {
    UA_ApplicationDescription_init(&session->clientDescription);
    session->activated = UA_FALSE;
    UA_NodeId_init(&session->authenticationToken);
    UA_NodeId_init(&session->sessionId);
    UA_String_init(&session->sessionName);
    session->maxRequestMessageSize  = 0;
    session->maxResponseMessageSize = 0;
    session->timeout = 0;
    UA_DateTime_init(&session->validTill);
    session->channel = UA_NULL;
    session->continuationPoints = (struct ContinuationPointList){UA_NULL};
}

void UA_Session_deleteMembers(UA_Session *session) {
    UA_ApplicationDescription_deleteMembers(&session->clientDescription);
    UA_NodeId_deleteMembers(&session->authenticationToken);
    UA_NodeId_deleteMembers(&session->sessionId);
    UA_String_deleteMembers(&session->sessionName);
    session->channel = UA_NULL;
    struct ContinuationPointEntry *cp;
    while((cp = LIST_FIRST(&session->continuationPoints))) {
        UA_ByteString_deleteMembers(&cp->identifier);
        UA_BrowseDescription_deleteMembers(&cp->browseDescription);
        LIST_REMOVE(cp, pointers);
        UA_free(cp);
    }
}

void UA_Session_updateLifetime(UA_Session *session) {
    session->validTill = UA_DateTime_now() + session->timeout * 10000; //timeout in ms
}

void UA_Session_detachSecureChannel(UA_Session *session) {
#ifdef UA_MULTITHREADING
    UA_SecureChannel *channel = session->channel;
    if(channel)
        uatomic_cmpxchg(&channel->session, session, UA_NULL);
    uatomic_set(&session->channel, UA_NULL);
#else
    if(session->channel)
        session->channel->session = UA_NULL;
    session->channel = UA_NULL;
#endif
}

/* these functions are here, since they need to include ua_session.h */
void UA_SecureChannel_attachSession(UA_SecureChannel *channel, UA_Session *session) {
#ifdef UA_MULTITHREADING
    if(uatomic_cmpxchg(&session->channel, UA_NULL, channel) == UA_NULL)
        uatomic_set(&channel->session, session);
#else
    if(session->channel != UA_NULL)
        return;
    session->channel = channel;
    channel->session = session;
#endif
}

void UA_SecureChannel_detachSession(UA_SecureChannel *channel) {
#ifdef UA_MULTITHREADING
    UA_Session *session = channel->session;
    if(session)
        uatomic_cmpxchg(&session->channel, channel, UA_NULL);
    uatomic_set(&channel->session, UA_NULL);
#else
    if(channel->session)
        channel->session->channel = UA_NULL;
    channel->session = UA_NULL;
#endif
}