const _ = require('lodash');

exports.defaultName = 'sACN';
exports.connectionType = 'multicast';
exports.defaultPort = 5568;
exports.heartbeatInterval = 5000;
exports.searchOptions = {
  type: "multicast",
  address: getMulticastGroup(1),
  port: 5568,
  validateResponse (msg, info) {
    return msg.toString('utf8', 4, 13) === "ASC-E1.17";
  },
};
exports.defaultPort = 5568;

exports.ready = function ready(device) {

  const d = device;
  d.data.universes = {};
  d.data.source = "Unknown Source";
  d.data.orderedUniverses = [];

  // device.draw();
  for(let i = 1; i <= 16; i++){
    d.connection.addMembership(getMulticastGroup(i));
  }
  
};

exports.data = function data(_device, buf) {

  const universeIndex = buf.readUInt16BE(113);
  const device = _device;

  let universe = device.data.universes[universeIndex];

  if(!universe){
    device.data.universes[universeIndex] = {};
    universe = device.data.universes[universeIndex];
  }

  universe.sequence = buf.readUInt8(111);
  universe.priority = buf.readUInt8(108);
  universe.cid = buf.toString('hex', 22, 38);
  universe.slots = buf.slice(126);

  if(buf.readUInt8(125) !== 0){
    universe.startCode = buf.readUInt8(125);
  }

  device.data.source = buf.toString('utf8', 44, 108);
  device.displayName = `${device.data.source} sACN`;
  device.data.ip = device.addresses[0];

  if(!_.includes(device.data.orderedUniverses, universeIndex)){
    device.data.orderedUniverses.push(universeIndex);
    device.data.orderedUniverses.sort();
    universe.slotElems = [];
    universe.slotElemsSet = false;

    device.draw();
    device.update("elementCache")
  }

  device.update("universeData", {
    universeIndex,
    universe,
    startCode: universe.startCode
  });

};

exports.heartbeat = function heartbeat(device) {
 
};

let lastUpdate = Date.now();
exports.update = function update(_device, doc, updateType, updateData){

  const device = _device;
  const data = updateData;

  if(updateType === "universeData" && data.universe){

    if(Date.now() - lastUpdate > 1000){
      lastUpdate = Date.now();
      device.update("elementCache")
    }

    const $elem = doc.getElementById(`universe-${data.universeIndex}`);

    if($elem && data.universe.slotElemsSet){

      if(data.universe.priority > 0){
        for(let i = 0; i < 512; i++){
          data.universe.slotElems[i].innerText = data.universe.slots[i];
        }

        const $code = doc.getElementById(`universe-${data.universeIndex}-code`);
        if(data.startCode === 0xDD){
          $code.innerText = "Net3"
        }else if(data.startCode === 0x17){
          $code.innerText = "Text"
        }else if(data.startCode === 0xCF){
          $code.innerText = "SIP"
        }else if(data.startCode === 0xCC){
          $code.innerText = "RDM"
        }
      }
    }else{
      device.draw();
      device.update("elementCache")
    }
  }else if(updateType === "elementCache"){
    device.data.orderedUniverses.forEach(universeIndex => {
      for(let i = 0; i < 512; i++){
        device.data.universes[universeIndex].slotElems[i] = doc.getElementById(`${universeIndex}-${i}`);
      }
      device.data.universes[universeIndex].slotElemsSet = true;
    });
  }
}

// From https://github.com/hhromic/e131-node/blob/master/lib/e131.js
function getMulticastGroup(universe) {
  if (universe < 1 || universe > 63999) {
    throw new RangeError('universe should be in the range [1-63999]');
  }
  return `239.255.${universe >> 8}.${universe & 0xff}`;
}