var async = require('async');
var Web3 = require('web3');

var Deploy = require('./deploy.js');
var ContractsManager = require('./contracts.js');

var DeployManager = function(options) {
  this.config = options.config;
  this.logger = options.logger;
  this.blockchainConfig = this.config.blockchainConfig;
  this.plugins = options.plugins;
  this.events = options.events;
  this.web3 = options.web3;
  this.chainConfig = (options.trackContracts !== false) ? this.config.chainTracker : false;
};

DeployManager.prototype.deployContracts = function(done) {
  var self = this;

  if (self.blockchainConfig === {} || self.blockchainConfig.enabled === false) {
    self.logger.info("Blockchain component is disabled in the config".underline);
    self.events.emit('blockchainDisabled', {});
    return done();
  }

  async.waterfall([
  function buildContracts(callback) {
    var contractsManager = new ContractsManager({
      contractFiles:  self.config.contractsFiles,
      contractsConfig: self.config.contractsConfig,
      logger: self.logger,
      plugins: self.plugins
    });
    contractsManager.build(callback);
  },
  function connectWithWeb3(contractsManager, callback) {
    var web3;
    if (self.web3) {
      web3 = self.web3;
    } else {
      web3 = new Web3();
      var web3Endpoint = 'http://' + self.config.blockchainConfig.rpcHost + ':' + self.config.blockchainConfig.rpcPort;
      web3.setProvider(new web3.providers.HttpProvider(web3Endpoint));
      if (!web3.isConnected()) {
        self.logger.error(("Couldn't connect to " + web3Endpoint.underline + " are you sure it's on?").red);
        self.logger.info("make sure you have an ethereum node or simulator running. e.g 'embark blockchain'".magenta);
        return callback(Error("error connecting to blockchain node"));
      }
    }
    callback(null, contractsManager, web3);
  },
  function setDefaultAccount(contractsManager, web3, callback) {
    web3.eth.getAccounts(function(err, accounts) {
      if (err) {
        return callback(new Error(err));
      }
      var accountConfig = self.config.blockchainConfig.account;
      var selectedAccount = accountConfig && accountConfig.address;
      web3.eth.defaultAccount = (selectedAccount || accounts[0]);
      callback(null, contractsManager, web3);
    });
  },
  function deployAllContracts(contractsManager, web3, callback) {
    var deploy = new Deploy({
      web3: web3,
      contractsManager: contractsManager,
      logger: self.logger,
      chainConfig: self.chainConfig,
      env: self.config.env
    });
    deploy.deployAll(function() {
      self.events.emit('contractsDeployed', contractsManager);
      callback(null, contractsManager);
    });
  }
  ], function(err, result) {
    if (err) {
      done(err, null);
    } else {
      done(null, result);
    }
  });
};

module.exports = DeployManager;