/*!
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright(c) 2010 Apogee Instruments, Inc.
* \namespace linuxHelpers
* \brief helper class for Linux OSs
*
*/

#include "linuxHelpers.h"
#include "CamHelpers.h" // for UsbFrmwr namespace
#include "apgHelper.h"
#include <libusb-1.0/libusb.h>
#include <sstream>

////////////////////////////
// GET		DEVICES		LINUX
std::vector< std::vector<uint16_t> > linuxHelpers::GetDevicesLinux()
{
    libusb_context * ctxt = NULL;

    int32_t result = libusb_init( &ctxt );

    if( result )
    {
        std::stringstream ss;
        ss << "libusb_init failed with error = " << result;
        apgHelper::throwRuntimeException(__FILE__, ss.str(),
            __LINE__, Apg::ErrorType_Connection );
    }

    try
    {
        libusb_device **devs = NULL;

        //get the list of usb devices
        const int32_t cnt = libusb_get_device_list(ctxt, &devs);

        std::vector< std::vector<uint16_t> > deviceVect;

        //search for and save apogee devices
        for(int32_t i=0; i < cnt; ++i)
        {
            libusb_device_descriptor desc;
            result = libusb_get_device_descriptor(devs[i], &desc);
            if (result < 0)
            {
                //error, ignore and go to next device
                continue;
            }

            if( UsbFrmwr::IsApgDevice(desc.idVendor, desc.idProduct) )
            {
                //save the values
                std::vector<uint16_t> temp;
                temp.push_back( libusb_get_device_address(devs[i]) );
                temp.push_back( desc.idVendor );
                temp.push_back( desc.idProduct );

                deviceVect.push_back( temp );
            }
        }


        libusb_free_device_list( devs, 1 );
        libusb_exit( ctxt );

        return deviceVect;
    }
    catch(std::exception & err)
    {
        //clean up before exiting
        //wish c++ had a final like python...
        libusb_exit( ctxt );
        std::vector< std::vector<uint16_t> > nothing;
        return nothing;
    }

}
