/*
 * This file is part of the Trezor project, https://trezor.io/
 *
 * Copyright (c) SatoshiLabs
 *
 * 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/>.
 */

#include <trezor_bsp.h>

#include "poll.h"

#include <io/usb.h>
#include <sys/systick.h>

#ifdef TREZOR_EMULATOR
#include "SDL.h"
#endif

uint8_t poll_events(const uint16_t* ifaces, size_t ifaces_num,
                    poll_event_t* event, uint32_t timeout_ms) {
  uint32_t deadline = ticks_timeout(timeout_ms);

  while (!ticks_expired(deadline)) {
#ifdef TREZOR_EMULATOR
    // Ensures that SDL events are processed. This prevents the emulator from
    // freezing when the user interacts with the window.
    SDL_PumpEvents();
#endif

    for (size_t i = 0; i < ifaces_num; i++) {
      uint8_t iface_num = ifaces[i] & 0xFF;
      if (iface_num < IFACE_USB_MAX) {
        if ((ifaces[i] & MODE_READ) == MODE_READ) {
          // check if USB can read
          if (sectrue == usb_webusb_can_read(iface_num)) {
            event->type = EVENT_USB_CAN_READ;
            return iface_num;
          }
        }
      }
    }

#ifndef TREZOR_EMULATOR
    __WFI();
#endif
  }

  event->type = EVENT_NONE;
  return 0;
}