const { ipcRenderer } = require('electron');
const { Netmask } = require('netmask');
const dgram = require('dgram');
const bonjour = require('bonjour')();
const net = require('net');
const os = require('os');
const ip = require('ip');

const DEVICE = require('./device.js');
// const SEARCH = require('./search.js');
const PLUGINS = require('./plugins.js');

let searching = false;
let allServers = false;

// from local-devices library
function getServers() {
  const interfaces = os.networkInterfaces();
  const result = [];

  for (const key in interfaces) {
    const addresses = interfaces[key];
    for (let i = addresses.length; i--; ) {
      const address = addresses[i];
      if (address.family === 'IPv4' && !address.internal) {
        const subnet = ip.subnet(address.address, address.netmask);
        let current = ip.toLong(subnet.firstAddress);
        const last = ip.toLong(subnet.lastAddress) - 1;
        while (current++ < last) result.push(ip.fromLong(current));
      }
    }
  }

  return result;
}

const searchSockets = [];

searchAll = function () {
  if (searching) {
    return true;
  }
  searching = true;
  ipcRenderer.send('disableSearchAll', '');
  document.getElementById('search-button').style.opacity = 0.2;
  //== console.clear();

  for (let i in DEVICE.all) {
    DEVICE.infoUpdate(DEVICE.all[i], 'status', 'refresh');
  }

  console.log('Searching...');

  // findOnlineDevices();
  allServers = getServers();
  let TCPFlag = true;
  if (allServers.length > 2046) {
    alert(
      'Unable to search for TCP devices - subnet too large!\n\nCue View requires subnet 255.255.248.0 (/21) or smaller.'
    );
    TCPFlag = false;
  }

  for (let p in PLUGINS.all) {
    const plugin = PLUGINS.all[p];
    
    try {
      switch (plugin.searchOptions.type) {
        case 'TCPport':
          if (TCPFlag) {
            newSearchTCP(p, plugin);
          }
          break;
        case 'Bonjour':
          newSearchBonjour(p, plugin);
          break;
        case 'UDPsocket':
          newSearchUDP(p, plugin);
          break;
        case 'multicast':
          newSearchMulticast(p, plugin);
          break;
      }
    } catch (err) {
      console.error(`Unable to search for plugin ${p}`);
    }
  }

  // searchBonjour();
  // searchTCP();
  // searchUDP();

  setTimeout(() => {
    searching = false;
    document.getElementById('search-button').style.opacity = '';

    for (let i = 0; i < searchSockets.length; i++) {
      try {
        searchSockets[i].close();
      } catch (err) {}
    }

    ipcRenderer.send('enableSearchAll', '');
  }, 5000);
};
module.exports.searchAll = searchAll;



newSearchBonjour = function (pluginType, plugin) {
  bonjour.find({ type: plugin.searchOptions.bonjourName }, (e) => {

    const validAddresses = [];
    for (let i in e.addresses) {
      if (e.addresses[i].indexOf(':') == -1) {
        validAddresses.push(e.addresses[i]);
      }
    }

    DEVICE.registerDevice({
      type: pluginType,
      defaultName: e.name,
      port: e.port,
      addresses: validAddresses,
    });
  });
};


newSearchTCP = function (pluginType, plugin) {
  for (let i = 0; i < allServers.length; i++) {
    TCPtest(allServers[i], pluginType, plugin);
  }
};

TCPtest = function (ip, pluginType, plugin) {
  const client = net.createConnection(plugin.searchOptions.testPort, ip, () => {
    client.write(plugin.searchOptions.searchBuffer);
    // DEVICE.registerDevice({
    // 	type: pluginType,
    // 	defaultName: plugin.defaultName,
    // 	port: plugin.defaultPort,
    // 	addresses: [ip]
    // })
  });
  client.on('data', (data) => {
    if (plugin.searchOptions.validateResponse(data)) {
      DEVICE.registerDevice({
        type: pluginType,
        defaultName: plugin.defaultName,
        port: plugin.defaultPort,
        addresses: [ip],
      });
    }
    client.end();
  });
  client.on('error', (err) => {
    // no device here
  });
};

findOnlineDevices = function () {
  const allInterfaces = os.networkInterfaces();
  const validInterfaces = [];
  for (let i in allInterfaces) {
    for (let j = 0; j < allInterfaces[i].length; j++) {
      const iface = allInterfaces[i][j];

      if (
        iface.family == 'IPv4' &&
        iface.internal == false &&
        iface.address.split('.')[0] != '169'
      ) {
        validInterfaces.push(iface);
      }
    }
  }

  for (let i = 0; i < validInterfaces.length; i++) {
    const block = new Netmask(validInterfaces[i].cidr);
    const f = block.first.split('.');
    const l = block.last.split('.');
    const cur = [f[0], f[1], f[2], f[3]];

    for (let j = Number(f[2]); j <= Number(l[2]); j++) {
      cur[2] = j;
      for (let k = Number(f[3]); k < Number(l[3]); k++) {
        cur[3] = k;
        allIPs.push(`${cur[0]}.${cur[1]}.${cur[2]}.${cur[3]}`);
      }
    }
  }
};



//const pjLinkMessage = Buffer.from([0x25, 0x32, 0x53, 0x52, 0x43, 0x48, 0x0d]);
//const xAirMessage = Buffer.from([0x2f, 0x78, 0x69, 0x6e, 0x66, 0x6f]);
//const serverUDP = dgram.createSocket('udp4');
//const serverUDP2 = dgram.createSocket('udp4');

newSearchUDP = function (pluginType, plugin) {
  const i = searchSockets.push(dgram.createSocket('udp4')) - 1;

  searchSockets[i].bind(plugin.searchOptions.listenPort, () => {
    
    // searchSockets[i].send(
    //   plugin.searchOptions.searchBuffer,
    //   plugin.searchOptions.devicePort,
    //   '255.255.255.255',
    //   (err) => {
    //     // console.log(err)
    //   }
    // );
    // setTimeout(() => {
    //   searchSockets[i].send(
    //     plugin.searchOptions.searchBuffer,
    //     plugin.searchOptions.devicePort,
    //     '255.255.255.255',
    //     (err) => {
    //       // console.log(err)
    //     }
    //   );
    // }, 100);
    // setTimeout(() => {
    //   console.log('send')
    //   searchSockets[i].send(
    //     plugin.searchOptions.searchBuffer,
    //     plugin.searchOptions.devicePort,
    //     '255.255.255.255',
    //     (err) => {
    //       // console.log(err)
    //     }
    //   );
    // }, 400);

    searchSockets[i].on('message', (msg, info) => {
      if (plugin.searchOptions.validateResponse(msg, info, DEVICE.all)) {
        searchSockets[i].close();
        DEVICE.registerDevice({
          type: pluginType,
          defaultName: plugin.defaultName,
          port: plugin.defaultPort,
          addresses: [info.address],
        });
      }
    });
  });
  searchSockets[i].on('listening', () => {
    searchSockets[i].setBroadcast(true);
    searchSockets[i].send(
        plugin.searchOptions.searchBuffer,
        plugin.searchOptions.devicePort,
        '255.255.255.255',
        (err) => {
          // console.log(err)
        }
      );
  });
};


newSearchMulticast = function (pluginType, plugin) {
  let socket = dgram.createSocket('udp4');
  socket.on('message', (msg, info) => {
    if (plugin.searchOptions.validateResponse(msg, info)) {
      socket.close();
      DEVICE.registerDevice({
        type: pluginType,
        defaultName: plugin.defaultName,
        port: plugin.defaultPort,
        addresses: [info.address],
      });
    }
  });
  socket.bind(plugin.searchOptions.port, function(){
    socket.addMembership(plugin.searchOptions.address);
  });
}