#include "configuration.h"

#include <QtMath>

namespace libmueb {

namespace {

constexpr quint8 kRgbByteSize{3};
constexpr quint8 kProtocolType{2};

}  // namespace

Configuration::Configuration() {
  QSettings settings(QSettings::IniFormat, QSettings::UserScope, "schmatrix",
                     "libmueb");
  if (settings.status() != QSettings::NoError) {
    qFatal("[Configuration] Configuration error aborting!");
  }

  // Building specific constants
  settings.beginGroup("building");
  quint32 floors = settings.value("floors", 13).toUInt();
  quint32 rooms_per_floor = settings.value("rooms_per_floor", 8).toUInt();
  quint32 windows_per_room = settings.value("windows_per_room", 2).toUInt();
  settings.endGroup();

  // Hardware specific constants
  settings.beginGroup("hardware");
  quint32 vertical_pixel_unit =
      settings.value("vertical_pixel_unit", 2).toUInt();
  quint32 horizontal_pixel_unit =
      settings.value("horizontal_pixel_unit", 2).toUInt();
  color_depth_ = settings.value("color_depth", 3).toUInt();
  settings.endGroup();

  quint32 pixels_per_window = vertical_pixel_unit * horizontal_pixel_unit;
  quint32 window_per_floor = rooms_per_floor * windows_per_room;
  quint32 windows = floors * window_per_floor;
  pixels_ = windows * pixels_per_window;
  // Alpha channel is not supported by hardware
  // The image is stored using a 24-bit RGB format (8-8-8)
  frame_ = QImage(window_per_floor * horizontal_pixel_unit,
                  floors * vertical_pixel_unit, QImage::Format_RGB888);
  frame_.fill(Qt::black);

  // Network protocol specific constants
  settings.beginGroup("network");
  animation_port_ = settings.value("animation_port", 50001).toUInt();
  target_address_ =
      QHostAddress(settings.value("target_address", "10.6.255.255").toString());
  quint32 window_byte_size = (color_depth_ >= 3 && color_depth_ < 5)
                                 ? pixels_per_window * kRgbByteSize / 2
                                 : pixels_per_window * kRgbByteSize;
  if (target_address_.isMulticast()) {
    multicast_interface_ = QNetworkInterface::interfaceFromName(
        settings.value("multicast_interface").toString());
  }

  quint32 max_windows_per_datagram =
      settings.value("max_windows_per_datagram", windows).toUInt();
  packet_header_size_ = 2;
  packet_size_ =
      packet_header_size_ + max_windows_per_datagram * window_byte_size;
  packet_payload_size_ = max_windows_per_datagram * window_byte_size;
  // Uncompressed frame fragment byte size
  frame_fragment_size_ =
      max_windows_per_datagram * pixels_per_window * kRgbByteSize;
  max_packet_number_ =
      qCeil(static_cast<qreal>(windows) / max_windows_per_datagram);
  settings.endGroup();

  if (settings.status() != QSettings::NoError || vertical_pixel_unit % 2 != 0 ||
      horizontal_pixel_unit % 2 != 0 || color_depth_ < 3 || color_depth_ > 8 ||
      animation_port_ < 0 || windows % max_windows_per_datagram != 0 ||
      packet_size_ > 1472 ||
      (target_address_.isMulticast() && !multicast_interface_.isValid())) {
    if (target_address_.isMulticast()) {
      qInfo() << "[Configuration] Possible multicast interfaces:"
              << QNetworkInterface::allInterfaces();
    }
    qFatal("[Configuration] Configuration error aborting!");
  }
}

Configuration &Configuration::Instance() {
  static Configuration instance;

  return instance;
}

QImage Configuration::frame() const { return frame_; }

const QImage &Configuration::ConstFrame() const { return frame_; }

QHostAddress Configuration::target_address() const { return target_address_; }

quint32 Configuration::pixels() const { return pixels_; }

quint8 Configuration::protocol_type() const { return kProtocolType; }

quint32 Configuration::packet_header_size() const {
  return packet_header_size_;
}

quint32 Configuration::packet_size() const { return packet_size_; }

quint32 Configuration::packet_payload_size() const {
  return packet_payload_size_;
}

quint32 Configuration::frame_fragment_size() const {
  return frame_fragment_size_;
}

quint16 Configuration::animation_port() const { return animation_port_; }

quint8 Configuration::max_packet_number() const { return max_packet_number_; }

quint8 Configuration::color_depth() const { return color_depth_; }

QNetworkInterface Configuration::multicast_interface() const {
  return multicast_interface_;
}

}  // namespace libmueb