/*
 * Video On Demand Samples
 *
 * Copyright (C) 2015 Microchip Technology Germany II GmbH & Co. KG
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * You may also obtain this software under a propriety license from Microchip.
 * Please contact Microchip for further information.
 *
 */

//#define LLD_TRACE

/*----------------------------------------------------------*/
/*! \file                                                   */
/*! \brief   Base Board initialisation                      */
/*----------------------------------------------------------*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <pthread.h>
#include <assert.h>

#include "Console.h"
#include "Board.h"
#include "DriverConfiguration.h"
#include "IndustrialStack_LLD.h"

/*----------------------------------------------------------*/
/* Static C helper functions                                */
/*----------------------------------------------------------*/

static void Queue_Init( Queue_t *queue )
{
    assert(NULL != queue);
    queue->testPattern = QUEUE_TESTPATTERN;
    queue->rxPos = 0;
    queue->txPos = 0;
    queue->pRx = queue->dataQueue;
    queue->pTx = queue->dataQueue;
}

static QueueEntry_t *Queue_GetRxPtr( Queue_t *queue )
{
    assert(NULL != queue && QUEUE_TESTPATTERN == queue->testPattern);
    QueueEntry_t *pEntry = NULL;
    if( queue->txPos - queue->rxPos > 0 )
    {
        pEntry = queue->pRx;
    }
    return pEntry;
}

static void Queue_PopRx( Queue_t *queue )
{
    assert(NULL != queue && QUEUE_TESTPATTERN == queue->testPattern);
    if( ++queue->pRx >= queue->dataQueue + BOARD_PMS_RX_QUEUE )
        queue->pRx = queue->dataQueue;
    ++queue->rxPos;
}

static QueueEntry_t *Queue_GetTxPtr( Queue_t *queue )
{
    assert(NULL != queue && QUEUE_TESTPATTERN == queue->testPattern);
    QueueEntry_t *pEntry = NULL;
    if( ( uint32_t )BOARD_PMS_RX_QUEUE + queue->rxPos - queue->txPos > 0 )
    {
        pEntry = queue->pTx;
    }
    return pEntry;
}

static void Queue_PopTx( Queue_t *queue )
{
    assert(NULL != queue && QUEUE_TESTPATTERN == queue->testPattern);
    if( ++queue->pTx >= queue->dataQueue + BOARD_PMS_RX_QUEUE )
        queue->pTx = queue->dataQueue;
    ++queue->txPos;
}

static void *ReceiveThread( void *tag )
{
    assert(NULL != tag);
    CIndustrialStackLld *var = ( CIndustrialStackLld * )tag;
    while( var->allowThreadRun )
    {
        if( -1 == var->hControlRx )
        {
            ConsolePrintf( PRIO_ERROR, RED"File handle for Control-RX is invalid, stopping reader thread."RESETCOLOR"\n" );
            if (NULL != var->listener)
                var->listener->OnReadThreadEnd(var);
            pthread_exit( NULL );
        }
        QueueEntry_t *pEntry = Queue_GetTxPtr(&var->rxQueue);
        if( NULL != pEntry )
        {
            int16_t payloadLen = 0;
            payloadLen = read( var->hControlRx, pEntry->buffer, sizeof( pEntry->buffer ) );
            if( payloadLen < 0 )
            {
                if( var->allowThreadRun )
                {
                    ConsolePrintf( PRIO_ERROR, RED"Stopping reader thread, because of error: '%s'"RESETCOLOR"\n",
                    GetErrnoString() );
                    if (NULL != var->listener)
                        var->listener->OnReadThreadEnd(var);
                }
                pthread_exit( NULL );
            }
            else if( payloadLen != 0 )
            {
                pEntry->payloadLen = payloadLen;
                Queue_PopTx(&var->rxQueue);
#ifdef LLD_TRACE
                {
                    ConsolePrintfStart( PRIO_HIGH, BLUE"%04d: MSG_RX: ", GetTickCountWord());
                    for ( int16_t i = 0; i < pEntry->payloadLen; i++ )
                    {
                        ConsolePrintfContinue( "%02X ", pEntry->buffer[i] );
                    }
                    ConsolePrintfExit(RESETCOLOR"\n");
                }
#endif
            }
        }
        else
        {
            ConsolePrintf( PRIO_ERROR, RED"WARNING, RX QUEUE FULL !!\nPlease increase BOARD_PMS_RX_QUEUE value, or increase polling speed\n"RESETCOLOR"\n" );
            usleep( 10000 );
        }
    }
    ConsolePrintf( PRIO_LOW, "Control Receive Thread ends\n" );
    if( var->allowThreadRun && NULL != var->listener)
        var->listener->OnReadThreadEnd(var);
    pthread_exit( NULL );
}

static void *SendThread( void *tag )
{
    assert(NULL != tag);
    CIndustrialStackLld *var = ( CIndustrialStackLld * )tag;
    while( var->allowThreadRun )
    {
        sem_wait( &var->txSem );
        if (!var->allowThreadRun)
            pthread_exit( NULL );
        QueueEntry_t *pEntry = Queue_GetRxPtr( &var->txQueue );
        assert(NULL != pEntry);
        if( -1 == var->hControlTx )
        {
            ConsolePrintf( PRIO_ERROR, RED"File handle for Control-TX is invalid, stopping send thread."RESETCOLOR"\n" );
            pthread_exit( NULL );
        }
#ifdef LLD_TRACE
        {
            uint32_t i;
            ConsolePrintfStart( PRIO_MEDIUM, YELLOW"%04d: MSG_TX: ", GetTickCountWord());
            for ( i = 0; i < pEntry->payloadLen; i++ )
            {
                ConsolePrintfContinue( "%02X ", pEntry->buffer[i] );
            }
            ConsolePrintfExit(RESETCOLOR"\n");
        }
#endif
        if( write( var->hControlTx, pEntry->buffer, pEntry->payloadLen ) != pEntry->payloadLen )
        {
            ConsolePrintf( PRIO_ERROR, RED"Failed to send %d bytes to the MOST control channel"RESETCOLOR"\n", pEntry->payloadLen );
            usleep(1000);
        }
        else
        {
            Queue_PopRx(&var->txQueue);
        }
        
    }
    pthread_exit( NULL );
}

/*----------------------------------------------------------*/
/* Public method implementations                            */
/*----------------------------------------------------------*/

CIndustrialStackLld::CIndustrialStackLld( int controlRxHandle, int controlTxHandle ) 
    : hControlRx(controlRxHandle), hControlTx(controlTxHandle), allowThreadRun(true), listener(NULL)
{
    Queue_Init(&rxQueue);
    Queue_Init(&txQueue);
    
    if (sem_init(&txSem, 0, 0) == -1)
    {
        ConsolePrintf(PRIO_ERROR, RED"CIndustrialStackLld constructor: sem_init failed"RESETCOLOR"\n");
        return;
    }
    
    pthread_create( &rxThread, NULL, ReceiveThread, this );
    pthread_create( &txThread, NULL, SendThread, this );
}

CIndustrialStackLld::~CIndustrialStackLld()
{
    void *dummy;
    allowThreadRun = false;
    sem_post( &txSem );
    
    pthread_join( txThread, &dummy );
    pthread_join( rxThread, &dummy );
    
    sem_destroy( &txSem );
}

void CIndustrialStackLld::ClearQueues()
{
    ConsolePrintf( PRIO_LOW, "Clearing INIC queues\n" );
    QueueEntry_t *pEntry;
    while( NULL != ( pEntry = Queue_GetRxPtr(&rxQueue) ) )
        Queue_PopRx(&rxQueue);
    while( NULL != ( pEntry = Queue_GetRxPtr(&txQueue) ) )
        Queue_PopRx(&txQueue);
}

uint16_t CIndustrialStackLld::DataAvailable()
{
    uint16_t readLen = 0;
    QueueEntry_t *pEntry = Queue_GetRxPtr(&rxQueue);
    if( NULL != pEntry )
        readLen = pEntry->payloadLen;
    return readLen;
}

uint16_t CIndustrialStackLld::Read( uint8_t *pData, uint32_t bufferLen )
{
    uint16_t readLen = 0;
    QueueEntry_t *pEntry = Queue_GetRxPtr(&rxQueue);
    if( NULL != pData && NULL != pEntry )
    {
        readLen = pEntry->payloadLen;
        if (readLen > bufferLen)
        {
            ConsolePrintf(PRIO_ERROR, RED"CIndustrialStackLld::Read buffer"\
                " length is too small"RESETCOLOR"\n");
            readLen = bufferLen;
        }
        memcpy( pData, pEntry->buffer, readLen );
        Queue_PopRx(&rxQueue);
    }
    return readLen;
}

bool CIndustrialStackLld::Write( uint16_t wLen, uint8_t *pData )
{
    if( -1 == hControlTx )
        return false;
    QueueEntry_t *pEntry = Queue_GetTxPtr( &txQueue );
    if( NULL != pData && NULL != pEntry )
    {
        memcpy( pEntry->buffer, pData, wLen );
        pEntry->payloadLen = wLen;
        Queue_PopTx( &txQueue );
        sem_post( &txSem );
        return true;
    }
    return false;
}