#include "TUSBScannerIO.h"

#include "tsystem.h"

#include <iostream></iostream>

#include <sstream></sstream>

//#define HAS_LIBUSB

#if defined(HAS_LIBUSB)

#include <usb.h></usb.h>

#endif

#include <errno.h></errno.h>

using namespace std;

class TUSBScannerIOPD {

public:

  TUSBScannerIOPD();

  struct usb_device *m_epson;

  struct usb_dev_handle *m_handle;

  int m_epR;

  int m_epW;

  bool m_trace;

};

static pthread_t T = 0;

//#define TRACE cout << __PRETTY_FUNCTION__ << endl;

#define TRACE

TUSBScannerIOPD::TUSBScannerIOPD()

    : m_epson(0), m_handle(0), m_epR(0), m_epW(0), m_trace(false) {

  /*initialize libusb*/

  TRACE

  if (T == 0) T = pthread_self();

#if defined(HAS_LIBUSB)

  usb_set_debug(9);

  usb_init();

  usb_find_busses();

  usb_find_devices();

#endif

}

namespace {

void buf2printable(const unsigned char *buffer, const int size,

                   stringstream &os) {

  int i = 0;

  if ((size == 2) && (buffer[0] == 0x1b)) {

    os << "ESC ";

    char c = buffer[1];

    if (isprint(c)) os << c << " ";

    return;

  }

  os << std::hex;

  for (; i < std::min(size, 0x40); ++i) {

    char c = buffer[i];

    os << "0x" << (unsigned int)c << " ";

  }

  if (i < size) os << "...";

}

}

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

TUSBScannerIO::TUSBScannerIO() : m_data(new TUSBScannerIOPD()) { TRACE }

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

namespace {

#if defined(HAS_LIBUSB)

// looking for an Epson device

struct usb_device *doCheck(struct usb_device *dev, int level) {

  if (!dev) return 0;

  cout << "checking idVendor = " << std::hex << dev->descriptor.idVendor

       << endl;

  if (dev->descriptor.idVendor == 0x04b8) return dev;

  for (int i = 0; i < dev->num_children; i++)

    if (doCheck(dev->children[i], level + 1)) return dev->children[i];

  return 0;

}

#endif

};

bool TUSBScannerIO::open() {

#if defined(HAS_LIBUSB)

  for (struct usb_bus *bus = usb_busses; bus; bus = bus->next) {

    if (bus->root_dev) {

      m_data->m_epson = doCheck(bus->root_dev, 0);

      if (m_data->m_epson) break;

    } else {

      struct usb_device *dev;

      for (dev = bus->devices; dev; dev = dev->next)

        m_data->m_epson = doCheck(dev, 0);

      if (m_data->m_epson) break;

    }

  }

  if (!m_data->m_epson) return false;

  cout << "found" << endl;

  m_data->m_handle = usb_open(m_data->m_epson);

  if (!m_data->m_handle) return false;

  cout << "opened" << endl;

  m_data->m_epR = m_data->m_epson->config[0]

                      .interface[0]

                      .altsetting[0]

                      .endpoint[0]

                      .bEndpointAddress;

  m_data->m_epW = m_data->m_epson->config[0]

                      .interface[0]

                      .altsetting[0]

                      .endpoint[1]

                      .bEndpointAddress;

  int rc;

  rc = usb_set_configuration(m_data->m_handle,

                             m_data->m_epson->config[0].bConfigurationValue);

  cout << "rc (config) = " << rc << endl;

  int ifc = 0;

  rc      = usb_claim_interface(m_data->m_handle, ifc);

  if ((rc == -EBUSY) || (rc == -ENOMEM)) return false;

  cout << "rc (claim) = " << rc << endl;

  cout << "gotit!" << endl;

  return true;

#else

  return false;

#endif

}

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

void TUSBScannerIO::close() {

  TRACE

#if defined(HAS_LIBUSB)

  if (m_data->m_handle) {

    usb_release_interface(m_data->m_handle, 0);

    usb_close(m_data->m_handle);

  }

  m_data->m_handle = 0;

  m_data->m_epson  = 0;

#endif

}

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

int TUSBScannerIO::receive(unsigned char *buffer, int size) {

  TRACE

#if defined(HAS_LIBUSB)

  int count;

  count = usb_bulk_read(m_data->m_handle, m_data->m_epR, (char *)buffer, size,

                        30 * 1000);

  if (m_data->m_trace) {

    stringstream os;

    os << "receive: size=" << size << " got = " << count << " buf=";

    buf2printable(buffer, count, os);

    os << '\n' << '\0';

    TSystem::outputDebug(os.str());

  }

  return count;

#else

  return 0;

#endif

}

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

int TUSBScannerIO::send(unsigned char *buffer, int size) {

  TRACE

#if defined(HAS_LIBUSB)

  int count;

  if (T != pthread_self()) {

    cout << "called from another thead" << endl;

    return 0;

  }

  count = usb_bulk_write(m_data->m_handle, m_data->m_epW, (char *)buffer, size,

                         30 * 1000);

  if (m_data->m_trace) {

    stringstream os;

    os << "send: size=" << size << " wrote = " << count << " buf=";

    buf2printable(buffer, size, os);

    os << '\n' << '\0';

    TSystem::outputDebug(os.str());

  }

  return count;

#else

  return 0;

#endif

}

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

void TUSBScannerIO::trace(bool on) {

  TRACE

  m_data->m_trace = on;

}

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

TUSBScannerIO::~TUSBScannerIO() { TRACE }