(function(){
  'use strict';

  var config;
  var settingsDialog;

  Office.initialize = function(reason){
    config = getConfig();

    jQuery(document).ready(function(){
      // Check if add-in is configured
      if (config && config.gitHubUserName) {
        // If configured load the gist list
        loadGists(config.gitHubUserName);
      } else {
        // Not configured yet
        $('#not-configured').show();
      }

      // When insert button is clicked, build the content
      // and insert into the body.
      $('#insert-button').on('click', function(){
        var gistId = $('.ms-ListItem.is-selected').children('.gist-id').val();
        getGist(gistId, function(gist, error) {
          if (gist) {
            buildBodyContent(gist, function (content, error) {
              if (content) {
                Office.context.mailbox.item.body.setSelectedDataAsync(content,
                  {coercionType: Office.CoercionType.Html}, function(result) {
                    if (result.status == 'failed') {
                      showError('Could not insert Gist: ' + result.error.message);
                    }
                });
              } else {
                showError('Could not create insertable content: ' + error);
              }
            });
          } else {
            showError('Could not retrieve Gist: ' + error);
          }
        });
      });

      // When the settings icon is clicked, open the settings dialog
      $('#settings-icon').on('click', function(){
        // Display settings dialog
        var url = new URI('../settings/dialog.html').absoluteTo(window.location).toString();
        if (config) {
          // If the add-in has already been configured, pass the existing values
          // to the dialog
          url = url + '?gitHubUserName=' + config.gitHubUserName + '&defaultGistId=' + config.defaultGistId;
        }

        var dialogOptions = { width: 20, height: 40, displayInIframe: true };

        Office.context.ui.displayDialogAsync(url, dialogOptions, function(result) {
          settingsDialog = result.value;
          settingsDialog.addEventHandler(Microsoft.Office.WebExtension.EventType.DialogMessageReceived, receiveMessage);
          settingsDialog.addEventHandler(Microsoft.Office.WebExtension.EventType.DialogEventReceived, dialogClosed);
        });
      })
    });
  };

  function loadGists(user) {
    $('#error-display').hide();
    $('#not-configured').hide();
    $('#gist-list-container').show();

    getUserGists(user, function(gists, error) {
      if (error) {

      } else {
        buildGistList($('#gist-list'), gists, onGistSelected);
      }
    });
  }

  function onGistSelected() {
    $('.ms-ListItem').removeClass('is-selected');
    $(this).addClass('is-selected');
    $('#insert-button').removeAttr('disabled');
  }

  function showError(error) {
    $('#not-configured').hide();
    $('#gist-list-container').hide();
    $('#error-display').text(error);
    $('#error-display').show();
  }

  function receiveMessage(message) {
    config = JSON.parse(message.message);
    setConfig(config, function(result) {
      settingsDialog.close();
      settingsDialog = null;
      loadGists(config.gitHubUserName);
    });
  }

  function dialogClosed(message) {
    settingsDialog = null;
  }
})();