'use strict';

var util = require('util'),
    winston = require('winston'),
    Realm = require('realm');

var RealmLogger = exports.Realm = function (options) {
  winston.Transport.call(this, options);

  //
  // Configure the Realm`
  //
  let LogSchema = {
    name: 'Log',
    properties: {
        level: 'string',
        message: 'string',
        timestamp: 'date',
    }
  };
  
  this.realm = new Realm({
    path: 'winston.realm',
    schema: [LogSchema]
  });
};

//
// Inherit from `winston.Transport` so you can take advantage
// of the base functionality and `.handleExceptions()`.
//
util.inherits(RealmLogger, winston.Transport);

//
// Expose the name of this Transport on the prototype
//
RealmLogger.prototype.name = 'realm';

//
// Define a getter so that `winston.transports.Realm`
// is available and thus backwards compatible.
//
winston.transports.Realm = RealmLogger;

//
// ### function log (level, msg, [meta], callback)
// #### @level {string} Level at which to log the message.
// #### @msg {string} Message to log
// #### @meta {Object} **Optional** Additional metadata to attach
// #### @callback {function} Continuation to respond to when complete.
// Core logging method exposed to Winston. Metadata is optional.
//
RealmLogger.prototype.log = function (level, msg, meta, callback) {
  let ts = new Date();
  
  this.realm.write(() => {
    this.realm.create('Log', {level: level, message: msg, timestamp: ts});
  });

  callback(null, true);
};