/*
 * FunctionCore.cpp
 *
 *  Created on: 18 May 2016
 *      Author: wentzelc
 */

// redA Libraries
#include "FunctionCore.h"
#include "TimingCore.h"
#include "LogCore.h"

// Standard C/C++ Libraries
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

//---------------------------------------------------------------------------

// Life cycle
CFunctionCore::CFunctionCore( const char * FunctionName )
{
    // Set name
    if (FunctionName) {
        Name = (char*)malloc( strlen(FunctionName) );
        strcpy( Name, FunctionName );
    }
    else {
        Name = NULL;
    }

    // In buffer
    Buffer = new CBuffer( 20 );
    OutFunction = NULL;

    // Input Timeout
    InStart.tv_sec  = 0;
    InStart.tv_usec = 0;
    InTimeout       = 100; // millisecs
}
//---------------------------------------------------------------------------

CFunctionCore::~CFunctionCore()
{
    // Destroy pointers
    if (Name) {
        free( Name );
    }
    if (Buffer) {
        delete Buffer;
    }
}
//---------------------------------------------------------------------------

// Manual Data Input/Output
int CFunctionCore::Input( int InputID, char * Buffer, int MaxLen )
{
    return 0;
}
//---------------------------------------------------------------------------

int CFunctionCore::Output( int OutputID, char * Buffer, int Len )
{
    return 0;
}
//---------------------------------------------------------------------------

// Automated Data Input/Output
bool CFunctionCore::AddInput( int InputID, CFunctionCore * OutFunction, int OutputID )
{
    return false;
}
//---------------------------------------------------------------------------

bool CFunctionCore::AddOutput( int OutputID, CFunctionCore * InFunction, int InputID )
{
    OutFunction = InFunction;

    return true;
}
//---------------------------------------------------------------------------

bool CFunctionCore::Process()
{
    // Misc
    long    Duration            = 0;

    if (Buffer->Len() > 0)
    {
        // Check duration since last PortIn
        Duration = TimePassed( InStart );
        if (Duration > InTimeout)
        {
            // Process Input
            ProcessBuffer( true );

            // Reset timer
            SetInterval( &InStart, 0 );
        }
    }
    return true;
}
//---------------------------------------------------------------------------

// Device Interface
bool CFunctionCore::Read( int fd )

{
    int     BytesRead   = 0;

    // Read File directly into buffer
    if (!(BytesRead = Buffer->ReadFromFD( fd )))
        return false;

    // Process Buffer
    ProcessBuffer( false );

    // Reset timer
    SetStartTime( &InStart );

    return true;
}
//---------------------------------------------------------------------------

bool CFunctionCore::Write( int fd )
{
    return false;
}
//---------------------------------------------------------------------------

int CFunctionCore::WriteToFD( int FD, char * Data, int Len )
{
    int     BytesWritten    = 0;
    int     TotalWritten    = 0;
    int     DataRemain      = 0;

    // Check if buffer created
    if ((FD == -1) || !Data) {
        return 0;
    }

    // Read Data into buffer
    DataRemain = (Len == -1)? strlen(Data) : Len;
    while (DataRemain)
    {
        // Read from file descriptor
        BytesWritten = write( FD, Data, DataRemain );
        if (BytesWritten <= 0)
            break;

        // Update Data Pointers
        TotalWritten += BytesWritten;
        DataRemain -= BytesWritten;
    }

    return TotalWritten;
}
//---------------------------------------------------------------------------