var log = require('gelf-pro');

// simple
log.setConfig({host: 'my.glog-server.net'});

// advanced
log.setConfig({
  fields: {facility: "example", owner: "Tom (a cat)"}, // optional; default fields for all messages
  filter: [], // optional; filters to discard a message
  transform: [], // optional; transformers for a message
  broadcast: [], // optional; listeners of a message
  levels: {}, // optional; default: see the levels section below
  adapterName: 'udp', // optional; currently supported "udp", "tcp" and "tcp-tls"; default: udp
  adapterOptions: { // this object is passed to the adapter.connect() method
    // common
    host: '127.0.0.1', // optional; default: 127.0.0.1
    port: 12201, // optional; default: 12201
    // ... and so on
    
    // tcp adapter example
    family: 4, // tcp only; optional; version of IP stack; default: 4
    timeout: 1000, // tcp only; optional; default: 10000 (10 sec)
    
    // udp adapter example
    protocol: 'udp4', // udp only; optional; udp adapter: udp4, udp6; default: udp4
    
    // tcp-tls adapter example
    key: fs.readFileSync('client-key.pem'), // tcp-tls only; optional; only if using the client certificate authentication
    cert: fs.readFileSync('client-cert.pem'), // tcp-tls only; optional; only if using the client certificate authentication
    ca: [fs.readFileSync('server-cert.pem')] // tcp-tls only; optional; only for the self-signed certificate
  }
});

var extra = {tom: 'cat', jerry: 'mouse', others: {spike: 1, tyke: 1}};

log.info("Hello world", extra, function (err, bytesSent) {});
log.info("Hello world", function (err, bytesSent) {});
log.info("Hello world", extra);
log.info("Hello world");

log.error('Oooops.', new Error('An error message'));
log.error(new Error('An error message'));

log.message(new Error('An error message'), 3); // same as previous

log.info(
  'a new msg goes here',
  {me: {fname: 'k', lname: 'k', bdate: new Date(2000, 01, 01)}}
);
// the extra becomes:
// {_me_fname: 'k', _me_lname: 'k', _me_bdate: 'Tue Feb 01 2000 00:00:00 GMT+0100 (CET)'}

log.setConfig({
  filter: [
    function (message) { // rejects a "debug" message
      return (message.level < 7);
    }
  ]
});

log.setConfig({
  transform: [
    function (message) { // unwind an error
      if (_.isError(message.error)) {
        message.error = {message: message.error.message, stack: message.error.stack};
      }
      return message;
    }
  ]
});

log.setConfig({
  broadcast: [
    function (message) { // broadcasting to console
      console[message.level > 3 ? 'log' : 'error'](message.short_message, message);
    }
  ]
});