text: App = {
    web3Provider: null,
    contracts: {},
    account: '0x0',
  
    init: function() {
      return App.initWeb3();
    },
  
    initWeb3: function() {
      // TODO: refactor conditional
      if (typeof web3 !== 'undefined') {
        // If a web3 instance is already provided by Meta Mask.
        App.web3Provider = web3.currentProvider;
        web3 = new Web3(web3.currentProvider);
      } else {
        // Specify default instance if no web3 instance provided
        App.web3Provider = new Web3.providers.HttpProvider('http://localhost:8545');
        web3 = new Web3(App.web3Provider);
      }
      return App.initContract();
    },
  
    initContract: function() {
      $.getJSON("Election.json", function(election) {
        // Instantiate a new truffle contract from the artifact
        App.contracts.Election = TruffleContract(election);
        // Connect provider to interact with contract
        App.contracts.Election.setProvider(App.web3Provider);
  
        App.listenForEvents();
  
        return App.render();
      });
    },
  
    // Listen for events emitted from the contract
    listenForEvents: function() {
      App.contracts.Election.deployed().then(function(instance) {
        instance.votedEvent({}, {
          fromBlock: 0,
          toBlock: 'latest'
        }).watch(function(error, event) {
          console.log("event triggered", event)
          // Reload when a new vote is recorded
          App.render();
        });
      });
    },
  
    render: function() {
      var electionInstance;
      var loader = $("#loader");
      var content = $("#content");
  
      loader.show();
      content.hide();
  
      if(window.ethereum){
        ethereum.enable().then(function(acc){
            App.account = acc[0];
            $("#accountAddress").html("Your Account: " + App.account);
        });
      }
  
      // Load contract data
      App.contracts.Election.deployed().then(function(instance) {
        electionInstance = instance;
        return electionInstance.candidatesCount();
      }).then(function(candidatesCount) {
        var candidatesResults = $("#candidatesResults");
        candidatesResults.empty();
  
        var candidatesSelect = $('#candidatesSelect');
        candidatesSelect.empty();
  
        for (var i = 1; i <= candidatesCount; i++) {
          electionInstance.candidates(i).then(function(candidate) {
            var id = candidate[0];
            var name = candidate[1];
            var voteCount = candidate[2];
  
            // Render candidate Result
            var candidateTemplate = "<tr><th>" + id + "</th><td>" + name + "</td><td>" + voteCount + "</td></tr>"
            candidatesResults.append(candidateTemplate);
  
            var candidateOption = "<option value='" + id + "' >" + name + "</ option>"
            candidatesSelect.append(candidateOption);
          });
        }
        return electionInstance.voters(App.account)
      }).then(function(hasVoted){
        if(hasVoted){
          $('#form_cast_vote').hide();
        }
        loader.hide();
        content.show();
      }).catch(function(error) {
        console.warn(error);
      });
    },
  
    castVote: function() {
      candidateId = $('#candidatesSelect').val()
      App.contracts.Election.deployed().then(function(instance){
        return instance.vote(candidateId, {from: App.account});
      }).then(function(result){
        $("#content").hide();
        $("#loader").show();
      }).catch(function(err) {
        console.error(err);
      });
    }
  };
  
  $(function() {
    $(window).load(function() {
      App.init();
    });
  });
  