var Web3 = require('web3');
var async = require('async');
var http = require('http');
var utils = require('./utils.js');

// TODO: needs a refactor and be done in a different way
var ServicesMonitor = function(options) {
  this.logger = options.logger;
  this.interval = options.interval || 5000;
  this.config = options.config;
  this.serverHost = options.serverHost || 'localhost';
  this.serverPort = options.serverPort || 8000;
  this.runWebserver = options.runWebserver;
  this.version = options.version;
};

ServicesMonitor.prototype.startMonitor = function() {
  this.check();
  this.monitor = setInterval(this.check.bind(this), this.interval);
};

ServicesMonitor.prototype.stopMonitor = function() {
};

ServicesMonitor.prototype.check = function() {
  var self = this;
  async.waterfall([
    function connectWeb3(callback) {
      self.logger.trace('connectWeb3');
      var web3 = new Web3();
      var web3Endpoint = 'http://' + self.config.blockchainConfig.rpcHost + ':' + self.config.blockchainConfig.rpcPort;
      web3.setProvider(new web3.providers.HttpProvider(web3Endpoint));
      callback(null, web3, []);
    },
    function addEmbarkVersion(web3, result, callback) {
      self.logger.trace('addEmbarkVersion');
      result.push(('Embark ' + self.version).green);
      callback(null, web3, result);
    },
    function checkEthereum(web3, result, callback) {
      self.logger.trace('checkEthereum');
      var service;
      if (web3.isConnected()) {
        service = (web3.version.node.split("/")[0] + " " + web3.version.node.split("/")[1].split("-")[0] + " (Ethereum)").green;
      } else {
        service = "No Blockchain node found".red;
      }
      result.push(service);
      callback(null, web3, result);
    },
    function checkWhisper(web3, result, callback) {
      self.logger.trace('checkWhisper');
      web3.version.getWhisper(function(err, res) {
        var service = 'Whisper';
        result.push(err ? service.red : service.green);
        callback(null, result);
      });
    },
    function checkIPFS(result, callback) {
      self.logger.trace('checkIPFS');

      utils.checkIsAvailable('http://localhost:5001', function(available) {
        if (available) {
          //Ideally this method should be in an IPFS API JSONRPC wrapper
          //The URL should also be flexible to accept non-default IPFS url
          self.logger.trace("Checking IPFS version...");
          http.get('http://localhost:5001/api/v0/version', function(res) {
            var body = '';
           res.on('data', function(d) {
               body += d;
           });
           res.on('end', function() {
               var parsed = JSON.parse(body);
               if(parsed.Version){
                 result.push(("IPFS " + parsed.Version).green);
               }
               else{
                 result.push("IPFS".green);
               }
               callback(null, result);
           });
           res.on('error', function(err) {
            self.logger.trace("Check IPFS version error: " + err);
            result.push("IPFS".green);
            callback(null, result);
           });
         });
        }
        else {
          result.push('IPFS'.red);
          return callback(null, result);
        }
      });
    },
    function checkDevServer(result, callback) {
      var host = self.serverHost || self.config.webServerConfig.host;
      var port = self.serverPort || self.config.webServerConfig.port;
      self.logger.trace('checkDevServer');
      var devServer = 'Webserver (http://' + host + ':' + port + ')';
      devServer = (self.runWebserver) ? devServer.green : devServer.red;
      result.push(devServer);
      callback(null, result);
    }
  ], function(err, result) {
    if (err) {
      self.logger.error(err.message);
    } else {
      self.logger.availableServices(result);
    }
  });
};

module.exports = ServicesMonitor;