/*
  sacn.cpp

  Copyright (c) 2020 Kevin Matz (kevin.matz@gmail.com)

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/

#include <Arduino.h>
#include <algorithm>
#include <iterator>
#include "sacn.h"


ESPsACN::ESPsACN() {
  udp.onPacket(std::bind(&ESPsACN::parsePacket, this,
                         std::placeholders::_1));
}

bool ESPsACN::subscribe(uint16_t num) {
  bool success;

  if (universes_.count(num)) {
    // already subscribed
    return true;
  }

  // listen multicast; works for unicast too
  success = udp.listenMulticast(E131MulticastAddress(num),
                                ACN_SDT_MULTICAST_PORT);

  Universe *u = new Universe();
  universes_.emplace(num, u);

  return success;
}

void ESPsACN::parsePacket(AsyncUDPPacket _packet) {
  buff_ = reinterpret_cast<e131_packet_t *>(_packet.data());

  // E1.31 - 5.3 ACN Packet Identifier
  // The ACN Packet Identifier shall contain the following sequence of characters
  if (memcmp(buff_->rlp.acn_id, ACN_PACKET_IDENTIFIER, sizeof(buff_->rlp.acn_id)))
    return;
  
  // E1.31 - 5.5 Vector
  // Sources shall set the Root Layer's Vector to VECTOR_ROOT_E131_DATA
  // if the packet contains E1.31 Data
  if (htonl(buff_->rlp.vector) != VECTOR_ROOT_E131_DATA)
    return;  

  // E1.31 - 6.2.1 E1.31 Data Packet: Vector
  // Sources sending an E1.31 Data Packet shall set the E1.31 Layer's
  // Vector to VECTOR_E131_DATA_PACKET.
  if (htonl(buff_->frame.vector) != VECTOR_E131_DATA_PACKET)
    return;

  // E1.31 - 7.2 DMP Layer: Vector
  // The DMP Layer's Vector shall be set to VECTOR_DMP_SET_PROPERTY
  if (buff_->dmp.vector != VECTOR_DMP_SET_PROPERTY)
    return;

  // ignore unverses recieved without active subscriptions
  if (!universes_.count(htons(buff_->frame.universe)))
    return;

  // E1.11 - 8.5.2 Dimmer class data
  // Dimmer level data should be sent in NULL START Code packets.
  if (buff_->dmp.property_values[0] != E111_NULL_START)
    return;

  // slots beyond the recieved count should be zero'd
  std::array<uint8_t, 513> full = {0};  
  std::copy(std::begin(buff_->dmp.property_values),
            std::begin(buff_->dmp.property_values) + htons(buff_->dmp.property_value_count),
            std::begin(full));
  // copy full-lenght universe
  e111_universe_t u;
  std::copy(std::begin(full), std::end(full), std::begin(u.data));

  // set universe data
  universes_.at(htons(buff_->frame.universe))->setData(&u);
}


IPAddress ESPsACN::E131MulticastAddress(uint16_t universe) {
  return IPAddress(239, 255, ((universe >> 8) & 0xff), ((universe >> 0) & 0xff));
}