#include "MsgQueues.h"

/**
 *  @addtogroup MsgQueues
 *  @{
 */

// ********** private definitions **********

#define MAX_MSG_QUEUE_SIZE          100                                             ///< Number of messages a queue can hold.

// ********** private data **********

static U32 msgQueueCounts[ NUM_OF_MSG_QUEUES ];                                     ///< Number of messages in each queue.
static U32 msgQueueStarts[ NUM_OF_MSG_QUEUES ];                                     ///< Starting index for each queue.
static U32 msgQueueNexts[ NUM_OF_MSG_QUEUES ];                                      ///< Next index for each queue.
static MESSAGE_WRAPPER_T msgQueues[ NUM_OF_MSG_QUEUES ][ MAX_MSG_QUEUE_SIZE ];      ///< The messages in each queue.

// ********** private function prototypes **********

/*********************************************************************//**
 * @brief
 * The initMsgQueues function initializes the MsgQueues unit.
 * @details \b Inputs: none
 * @details \b Outputs: The MsgQueues unit is initialized.
 * @return none
 *************************************************************************/
void initMsgQueues( void )
{
    U32 q, m;

    // Reset message queues
    for ( q = 0; q < NUM_OF_MSG_QUEUES; q++ )
    {
        msgQueueCounts[ q ] = 0;
        msgQueueStarts[ q ] = 0;
        msgQueueNexts[ q ] = 0;
        for ( m = 0; m < MAX_MSG_QUEUE_SIZE; m++ )
        {
            blankMessageInWrapper( &msgQueues[ q ][ m ] );
        }
    }
}

/*********************************************************************//**
 * @brief
 * The addToMsgQueue function adds a message to a given message queue.
 * @warning This function is not thread safe and should only be called from
 * the General Task.
 * @details \b Alarm: ALARM_ID_TD_SOFTWARE_FAULT if given queue is invalid
 * or full.
 * @details \b Inputs: msgQueueCounts[]
 * @details \b Outputs: msgQueues[], msgQueueNexts[], msgQueueCounts[]
 * @param queue the message queue to add a message to
 * @param msg a pointer to a message to add to the queue
 * @return TRUE if message added to queue successfully, FALSE if not
 *************************************************************************/
BOOL addToMsgQueue( MSG_QUEUE_T queue, MESSAGE_WRAPPER_T *msg )
{
    BOOL result = FALSE;

    // Verify given message queue
    if ( queue < NUM_OF_MSG_QUEUES )
    {
        if ( FALSE == isMsgQueueFull( queue ) )
        {
            result = TRUE;
            // Add message to queue
            msgQueues[ queue ][ msgQueueNexts[ queue ] ] = *msg;
            // Increment next index to add to
            msgQueueNexts[ queue ] = INC_WRAP( msgQueueNexts[ queue ], 0, MAX_MSG_QUEUE_SIZE - 1 );
            // Increment queue count
            msgQueueCounts[ queue ]++;
        }
        else // Msg queue is full
        {
            SET_ALARM_WITH_1_U32_DATA( ALARM_ID_RO_SOFTWARE_FAULT, SW_FAULT_ID_MSG_QUEUES_ADD_QUEUE_FULL )
        }
    }
    else // Invalid message queue
    {
        SET_ALARM_WITH_2_U32_DATA( ALARM_ID_TD_SOFTWARE_FAULT, SW_FAULT_ID_MSG_QUEUES_ADD_INVALID_QUEUE, queue )
    }

    return result;
}

/*********************************************************************//**
 * @brief
 * The getFromMsgQueue function retrieves the next message from a given
 * message queue.
 * @warning This function is not thread safe and should only be called from
 * the General Task.
 * @details \b Alarm: ALARM_ID_TD_SOFTWARE_FAULT if given queue is invalid.
 * @details \b Inputs: msgQueueCounts[]
 * @details \b Outputs: msgQueues[], msgQueueStarts[], msgQueueCounts[]
 * @param queue the message queue to retrieve a message from
 * @param msg a pointer to a message to populate with the retrieved message.
 * @return TRUE if a message was found to retrieve, FALSE if not
 *************************************************************************/
BOOL getFromMsgQueue( MSG_QUEUE_T queue, MESSAGE_WRAPPER_T *msg )
{
    BOOL result = FALSE;

    // Verify given message queue
    if ( queue < NUM_OF_MSG_QUEUES )
    {
        if ( FALSE == isMsgQueueEmpty( queue ) )
        {
            result = TRUE;
            // Get message from queue
            *msg = msgQueues[ queue ][ msgQueueStarts[ queue ] ];
            // Increment queue next index to get from
            msgQueueStarts[ queue ] = INC_WRAP( msgQueueStarts[ queue ], 0, MAX_MSG_QUEUE_SIZE - 1 );
            // Decrement queue count
            msgQueueCounts[ queue ]--;
        }
        else // Message queue is empty
        {
            // Result already set to FALSE
        }
    }
    else // Invalid message queue
    {
        SET_ALARM_WITH_2_U32_DATA( ALARM_ID_TD_SOFTWARE_FAULT, SW_FAULT_ID_MSG_QUEUES_GET_INVALID_QUEUE, queue )
    }

    return result;
}

/*********************************************************************//**
 * @brief
 * The isMsgQueueEmpty function determines whether a given message queue is empty.
 * @details \b Alarm: ALARM_ID_TD_SOFTWARE_FAULT if the given queue is invalid.
 * @details \b Inputs: msgQueueCounts[]
 * @details \b Outputs: none
 * @param queue the message queue to check
 * @return TRUE if a given message queue is empty, FALSE if not
 *************************************************************************/
BOOL isMsgQueueEmpty( MSG_QUEUE_T queue )
{
    BOOL result = FALSE;

    // Verify given message queue
    if ( queue < NUM_OF_MSG_QUEUES )
    {
        if ( msgQueueCounts[ queue ] == 0 )
        {
            result = TRUE;
        }
    }
    else // Invalid message queue
    {
        SET_ALARM_WITH_2_U32_DATA( ALARM_ID_TD_SOFTWARE_FAULT, SW_FAULT_ID_MSG_QUEUES_IS_EMPTY_INVALID_QUEUE, queue )
    }

    return result;
}

/*********************************************************************//**
 * @brief
 * The isMsgQueueFull function determines whether a given message queue is full.
 * @details \b Alarm: ALARM_ID_TD_SOFTWARE_FAULT if the given queue is invalid.
 * @details \b Inputs: msgQueueCounts[]
 * @details \b Outputs: none
 * @param queue the message queue to check
 * @return TRUE if the given message queue is full, FALSE if not
 *************************************************************************/
BOOL isMsgQueueFull( MSG_QUEUE_T queue )
{
    BOOL result = TRUE;

    // Verify given message queue
    if ( queue < NUM_OF_MSG_QUEUES )
    {
        if ( msgQueueCounts[ queue ] < MAX_MSG_QUEUE_SIZE )
        {
            result = FALSE;
        }
    }
    else // Invalid message queue
    {
        SET_ALARM_WITH_2_U32_DATA( ALARM_ID_RO_SOFTWARE_FAULT, SW_FAULT_ID_MSG_QUEUES_IS_FULL_INVALID_QUEUE, queue )
    }

    return result;
}

/*********************************************************************//**
 * @brief
 * The blankMessage function blanks a given message.
 * @details \b Inputs: none
 * @details \b Outputs: given message is blanked
 * @param message Pointer to the message to blank
 * @return none
 *************************************************************************/
void blankMessage( MESSAGE_T *message )
{
    U32 i;
    U32 msgSize = sizeof(MESSAGE_T);
    U08 *msgContent = (U08*)message;

    // Zero out the message
    for ( i = 0; i < msgSize; i++ )
    {
        *msgContent++ = 0x0;
    }
}

/*********************************************************************//**
 * @brief
 * The blankMessageInWrapper function blanks a given message in a wrapper.
 * @details \b Inputs: none
 * @details \b Outputs: given wrapped message is blanked
 * @param message Pointer to the message in a wrapper to blank
 * @return none
 *************************************************************************/
void blankMessageInWrapper( MESSAGE_WRAPPER_T *message )
{
    U32 i;
    U32 msgSize = sizeof(MESSAGE_T);
    U08 *msgContent = (U08*)message;

    // Zero out the message
    for ( i = 0; i < msgSize; i++ )
    {
        *msgContent++ = 0x0;
    }

    // Set msg ID out of bounds in case blank message goes somewhere
    message->msg.hdr.msgID = 0xFFFF;
}

/**@}*/