#include "Touchpad.h"

#include <fmt/format.h>
#include <sys/poll.h>
#include <fcntl.h>

#include "log.h"

Touchpad::Touchpad(): m_valid{}, m_ev{}
{
  m_fd = open("/dev/input/event0", O_RDONLY | O_NONBLOCK);
  int rc = libevdev_new_from_fd(m_fd, &m_dev);
  if (rc < 0) {
    log_cout << fmt::format("Failed to init libevdev ({})\n", strerror(-rc));
    return;
  }

  log_cout << fmt::format("Input device name: \"{}\"\n", libevdev_get_name(m_dev));
  log_cout << fmt::format("Input device ID: bus {:x} vendor {:x} product {:x}\n",
       libevdev_get_id_bustype(m_dev),
       libevdev_get_id_vendor(m_dev),
       libevdev_get_id_product(m_dev));
  if (!libevdev_has_event_type(m_dev, EV_REL) ||
      !libevdev_has_event_code(m_dev, EV_KEY, BTN_LEFT) ||
      !libevdev_has_event_code(m_dev, EV_KEY, BTN_RIGHT)) {
    log_cout << fmt::format("Not the correct device, ignoring.\n");
  } else {
    m_valid = true;
  }
}

bool Touchpad::is_valid()
{
  return m_valid;
}

bool Touchpad::event_available()
{
  if (!m_valid) {
    return false;
  }

  if (m_ev.has_value()) {
    return true;
  }

  input_event ev{};
  int rc = libevdev_next_event(m_dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
  if (rc != 0) {
    return false;
  }
  log_cout << fmt::format("Event: {} {} {}\n",
                       libevdev_event_type_get_name(ev.type),
                       libevdev_event_code_get_name(ev.type, ev.code),
                       ev.value);

  m_ev = ev;

  return true;
}

input_event Touchpad::get_event()
{
  if (m_ev.has_value()) {
    input_event result = *m_ev;
    m_ev.reset();
    return result;
  }

  input_event ev{};
  int rc = libevdev_next_event(m_dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
  if (rc != 0) {
    throw std::runtime_error("Touchpad::get_event() couldn't read event");
  }
  log_cout << fmt::format("Event: {} {} {}\n",
                       libevdev_event_type_get_name(ev.type),
                       libevdev_event_code_get_name(ev.type, ev.code),
                       ev.value);
  return ev;
}

bool Touchpad::event_is_button1(const input_event& ev)
{
  return ev.type == EV_KEY && ev.code == BTN_LEFT && ev.value == 0; // Press down
}

bool Touchpad::event_is_button2(const input_event& ev)
{
  return ev.type == EV_KEY && ev.code == BTN_RIGHT && ev.value == 0; // Press down
}