require([
  'shared/stk_helper'
], function(STKHelper) {
  'use strict';
  (function() {
    var iccManager = window.navigator.mozIccManager;

    function getIcc(iccId) {
      window.DUMP('ICC Getting ICC for ' + iccId);
      return iccManager.getIccById(iccId);
    }

    /**
     * Move settings to foreground
     */
    function reopenSettings() {
      navigator.mozApps.getSelf().onsuccess = function getSelfCB(evt) {
        var app = evt.target.result;
        app.launch('settings');
      };
    }

    // Consts
    // 3GPP spec: TS 11.14
    // 13.4 Type of Command and Next Action Indicator
    const STK_NEXT_ACTION_INDICATOR = {
      16: 'stkItemsNaiSetUpCall',
      17: 'stkItemsNaiSendSs',
      18: 'stkItemsNaiSendUssd',
      19: 'stkItemsNaiSendSms',
      32: 'stkItemsNaiPlayTone',
      33: 'stkItemsNaiDisplayText',
      34: 'stkItemsNaiGetInkey',
      35: 'stkItemsNaiGetInput',
      36: 'stkItemsNaiSelectItem',
      37: 'stkItemsNaiSetUpMenu',
      40: 'stkItemsNaiSetIdleModeText',
      48: 'stkItemsNaiPerformCardApdu',  // class "a"
      49: 'stkItemsNaiPowerOnCard',      // class "a"
      50: 'stkItemsNaiPowerOffCard',     // class "a"
      51: 'stkItemsNaiGetReaderStatus',  // class "a"
      64: 'stkItemsNaiOpenChannel',      // class "e"
      65: 'stkItemsNaiCloseChannel',     // class "e"
      66: 'stkItemsNaiReceiveData',      // class "e"
      67: 'stkItemsNaiSendData',         // class "e"
      68: 'stkItemsNaiGetChannelStatus', // class "e"
      96: 'Reserved',                    // for TIA/EIA-136
      129: 'stkItemsNaiEndOfTheProactiveSession'
    };

    /**
     * Init
     */
    var iccStkList = document.getElementById('icc-stk-list');
    var iccStkMainHeader = document.getElementById('icc-stk-main-header');
    var iccStkHeader = document.getElementById('icc-stk-header');
    var iccStkSubheader = document.getElementById('icc-stk-subheader');
    var stkOpenAppName = null;
    var stkLastSelectedText = null;
    var goBackTimer = {
      timer: null,
      timeout: 0
    };
    var selectTimer = {
      timer: null,
      timeout: 0
    };
    var _visibilityChangeHandler = null;
    var _backHandler = null;
    init();


    /**
     * This is a helper for localizing DOM Elements using L10nID.
     * Second argument may take one of the following forms:
     * a string -> l10nId
     * an object -> {id: l10nId, args: l10nArgs}
     * an object -> {raw: string}
     *
     * Read more at MDN: http://mzl.la/1A76Fby
     */
    function localizeElement(element, l10n) {
      if (typeof(l10n) === 'string') {
        element.setAttribute('data-l10n-id', l10n);
      } else if (l10n.raw) {
        element.removeAttribute('data-l10n-id');
        element.textContent = l10n.raw;
      } else {
        document.l10n.setAttributes(element, l10n.id, l10n.attrs);
      }
    }

    function sendVisibilityChangeEvent() {
      navigator.mozApps.getSelf().onsuccess = function(evt) {
        var app = evt.target.result;
        app.connect('settingsstk').then(function onConnAccepted(ports) {
          window.DUMP('STK_Settings IAC: ' + ports);
          ports.forEach(function(port) {
            window.DUMP('STK_Settings IAC: ' + port);
            port.postMessage('StkMenuHidden');
          });
        }, function onConnRejected(reason) {
          window.DUMP('STK_Settings IAC is rejected');
          window.DUMP(reason);
        });
      };
    }

    function getNextActionString(nextActionList, index) {
      window.DUMP('STK NAL: ' + nextActionList);

      var nextActionString;
      if (nextActionList &&
          nextActionList[index] !== null &&
          nextActionList[index] !== 96 &&
          STK_NEXT_ACTION_INDICATOR[nextActionList[index]]) {
        nextActionString = STK_NEXT_ACTION_INDICATOR[nextActionList[index]];
      } else {
        nextActionString = null;
      }
      return nextActionString;
    }

    function visibilityChangeHandler() {
      if (document.hidden && Settings && Settings.currentPanel == '#icc') {
        window.DUMP('STK_Settings visibilityChangeHandler');
        sendVisibilityChangeEvent();
      }
    }

    /**
     * Init STK UI
     */
    function init() {
      window.addEventListener('stkasynccommand',
        function do_handleAsyncSTKCmd(event) {
          handleSTKMessage(event.detail.message);
        });

      window.addEventListener('stkmenuselection',
        function do_handleAsyncSTKCmd(event) {
          updateMenu(event.detail.menu);
        });

      document.addEventListener('visibilitychange',
        visibilityChangeHandler, false);

      iccStkMainHeader.addEventListener('action', function onBack() {
        if (typeof _backHandler === 'function') {
          _backHandler();
        }
      });
    }

    function addCloseNotificationsEvents(message) {
      function onVisibilityChange() {
        if (document.hidden && Settings && Settings.currentPanel == '#icc') {
          document.removeEventListener('visibilitychange',
            _visibilityChangeHandler, false);
          stkResTerminate(message);
        }
      }
      document.removeEventListener('visibilitychange',
        _visibilityChangeHandler, false);
      _visibilityChangeHandler = onVisibilityChange;
      document.addEventListener('visibilitychange',
        _visibilityChangeHandler, false);
      window.onbeforeunload = function() {
        responseSTKCommand(message, {
          resultCode: iccManager.STK_RESULT_NO_RESPONSE_FROM_USER
        }, true);
      };
    }

    function returnToSettingsMainMenu() {
      if (Settings) {
        Settings.currentPanel = '#root';
      }
    }

    function stkResTerminate(message) {
      returnToSettingsMainMenu();
      responseSTKCommand(message, {
        resultCode: iccManager.STK_RESULT_UICC_SESSION_TERM_BY_USER
      }, true);
    }

    function stkResGoBack(message) {
      responseSTKCommand(message, {
        resultCode: iccManager.STK_RESULT_BACKWARD_MOVE_BY_USER
      });
      // We'll return to settings if no STK response received in a grace period
      var reqTimerGoBack =
        window.navigator.mozSettings.createLock().get('icc.goBackTimeout');
      reqTimerGoBack.onsuccess = function icc_getTimerGoBackSuccess() {
        goBackTimer.timeout = reqTimerGoBack.result['icc.goBackTimeout'];
        goBackTimer.timer = setTimeout(function() {
          returnToSettingsMainMenu();
        }, goBackTimer.timeout);
      };
    }

    function stkResNoResponse(message) {
      var reqTimerSelect =
        window.navigator.mozSettings.createLock().get('icc.selectTimeout');
      reqTimerSelect.onsuccess = function icc_getTimerSelectSuccess() {
        selectTimer.timeout = reqTimerSelect.result['icc.selectTimeout'];
        selectTimer.timer = setTimeout(function() {
          responseSTKCommand(message, {
            resultCode: iccManager.STK_RESULT_NO_RESPONSE_FROM_USER
          }, true);
          returnToSettingsMainMenu();
        }, selectTimer.timeout);
      };
    }

    function stkCancelGoBack() {
      if (goBackTimer.timer) {
        window.clearTimeout(goBackTimer.timer);
        goBackTimer.timer = null;
      }
      if (selectTimer.timer) {
        window.clearTimeout(selectTimer.timer);
        selectTimer.timer = null;
      }
    }

    /**
     * Response ICC Command
     */
    function responseSTKCommand(message, response) {
      window.DUMP('sendStkResponse to message: ', message);
      window.DUMP('sendStkResponse -- # response = ', response);

      getIcc(message.iccId).sendStkResponse(message.command, response);
    }

    /**
     * Handle ICC Messages
     */
    function handleSTKMessage(message) {
      window.DUMP('STK Proactive Message:', message);

      stkCancelGoBack();
      reopenSettings();

      switch (message.command.typeOfCommand) {
        case iccManager.STK_CMD_SELECT_ITEM:
          addCloseNotificationsEvents(message);
          updateSelection(message);
          Settings.currentPanel = '#icc';
          _backHandler = stkResGoBack.bind(null, message);
          break;

        default:
          window.DUMP('STK Message not managed... response OK');
          responseSTKCommand(message, {
            resultCode: iccManager.STK_RESULT_OK
          });
      }
    }

    /**
     * Navigate through all available STK applications
     */
    function updateMenu(menu) {
      window.DUMP('Showing STK main menu: ', menu);
      stkOpenAppName = null;

      stkCancelGoBack();

      clearList();

      if (!menu || !menu.entries || !menu.entries.items ||
        (menu.entries.items.length == 1 && menu.entries.items[0] === null)) {
        return;
      }

      window.DUMP('STK Main App Menu title: ' + menu.entries.title);
      window.DUMP('STK Main App Menu default item: ' +
        menu.entries.defaultItem);

      showTitle({raw: menu.entries.title});
      menu.entries.items.forEach(function(menuItem, index) {
        window.DUMP('STK Main App Menu item: ' + menuItem.text + ' # ' +
              menuItem.identifier);
        var nextActionString = getNextActionString(menu.entries.nextActionList,
          index);
        // Get the first icon if exists
        var icon = STKHelper.getFirstIconRawData(menuItem);
        if (icon) {
          iccStkList.dataset.customIcon = true;
        }

        window.DUMP('STK NEXTACTION: ' + nextActionString);
        iccStkList.appendChild(buildMenuEntry({
          id: 'stk-menuitem-' + menuItem.identifier,
          icon: icon,
          text: {raw: menuItem.text},
          nai: nextActionString,
          onclick: onMainMenuItemClick,
          attributes: [
            ['stk-menu-item-identifier', menuItem.identifier],
            ['stk-menu-item-iccId', menu.iccId]
          ]
        }));
      });

      // Optional Help menu
      if (menu.entries.isHelpAvailable) {
        iccStkList.appendChild(buildMenuEntry({
          id: 'stk-helpmenuitem',
          text: 'operatorServices-helpmenu',
          onclick: function __onHelpClick__(event) {
            showHelpMenu(menu, event);
          },
          attributes: []
        }));
      }

      getIcc(menu.iccId).onstksessionend = function handleSTKSessionEnd(event) {
        updateMenu(menu);
        Settings.currentPanel = '#icc';
      };

      _backHandler = function backToRootPanel() {
        Settings.currentPanel = '#root';
      };
    }

    function onMainMenuItemClick(event) {
      var iccId = event.target.getAttribute('stk-menu-item-iccId');
      var identifier = event.target.getAttribute('stk-menu-item-identifier');
      window.DUMP('sendStkMenuSelection: ', identifier);

      getIcc(iccId).sendStkMenuSelection(identifier, false);
      stkLastSelectedText = event.target.textContent;
      stkOpenAppName = stkLastSelectedText;
    }

    function showHelpMenu(menu, event) {
      window.DUMP('Showing STK help menu');
      stkOpenAppName = null;

      clearList();

      showTitle('operatorServices-helpmenu');
      menu.entries.items.forEach(function(menuItem) {
        window.DUMP('STK Main App Help item: ' + menuItem.text + ' # ' +
              menuItem.identifier);
        var icon = STKHelper.getFirstIconRawData(menuItem);
        if (icon) {
          iccStkList.dataset.customIcon = true;
        }
        iccStkList.appendChild(buildMenuEntry({
          id: 'stk-helpitem-' + menuItem.identifier,
          text: {raw: menuItem.text},
          icon: icon,
          onclick: onMainMenuHelpItemClick,
          attributes: [
            ['stk-help-item-identifier', menuItem.identifier],
            ['stk-menu-item-iccId', menu.iccId]
          ]
        }));
      });

      _backHandler = updateMenu.bind(null, menu);
    }

    function onMainMenuHelpItemClick(event) {
      var iccId = event.target.getAttribute('stk-menu-item-iccId');
      var identifier = event.target.getAttribute('stk-help-item-identifier');
      window.DUMP('sendStkHelpMenuSelection: ', identifier);

      getIcc(iccId).sendStkMenuSelection(identifier, true);
      stkLastSelectedText = event.target.textContent;
      stkOpenAppName = stkLastSelectedText;
    }

    /**
     * Navigate through the STK application options
     */
    function updateSelection(message) {
      var menu = message.command.options;

      window.DUMP('Showing STK menu');
      clearList();

      window.DUMP('STK App Menu title: ' + menu.title);
      window.DUMP('STK App Menu default item: ' + menu.defaultItem);

      showTitle({raw: menu.title});
      menu.items.forEach(function(menuItem, index) {
        window.DUMP('STK App Menu item: ' + menuItem.text + ' # ' +
          menuItem.identifier);
        var nextActionString = getNextActionString(menu.nextActionList, index);
        window.DUMP('STK NEXTACTION: ' + nextActionString);
        var icon = STKHelper.getFirstIconRawData(menuItem);
        if (icon) {
          iccStkList.dataset.customIcon = true;
        }
        iccStkList.appendChild(buildMenuEntry({
          id: 'stk-menuitem-' + menuItem.identifier,
          text: {raw: menuItem.text},
          icon: icon,
          nai: nextActionString,
          onclick: function onSelectOptionClick(event) {
            document.removeEventListener('visibilitychange',
              _visibilityChangeHandler, false);
            onSelectOption(message, event);
          },
          attributes: [['stk-select-option-identifier', menuItem.identifier]]
        }));
      });

      // Optional Help menu
      if (menu.isHelpAvailable) {
        iccStkList.appendChild(buildMenuEntry({
          id: 'stk-helpmenuitem',
          text: 'operatorServices-helpmenu',
          onclick: function __onHelpClick__(event) {
            showHelpSelection(message, event);
          },
          attributes: []
        }));
      }

      stkResNoResponse(message);
    }

    function onSelectOption(message, event) {
      var identifier =
        event.target.getAttribute('stk-select-option-identifier');
      responseSTKCommand(message, {
        resultCode: iccManager.STK_RESULT_OK,
        itemIdentifier: identifier
      });
      stkLastSelectedText = event.target.textContent;
    }

    function showHelpSelection(message, event) {
      var menu = message.command.options;

      window.DUMP('Showing STK help menu');
      stkOpenAppName = null;

      clearList();

      showTitle('operatorServices-helpmenu');
      menu.items.forEach(function(menuItem) {
        window.DUMP('STK Main App Help item: ' + menuItem.text + ' # ' +
              menuItem.identifier);
        var icon = STKHelper.getFirstIconRawData(menuItem);
        if (icon) {
          iccStkList.dataset.customIcon = true;
        }
        iccStkList.appendChild(buildMenuEntry({
          id: 'stk-helpitem-' + menuItem.identifier,
          text: {raw: menuItem.text},
          icon: icon,
          onclick: function onSelectOptionClick(event) {
            onSelectionHelpItemClick(message, event);
          },
          attributes: [
            ['stk-help-item-identifier', menuItem.identifier],
            ['stk-menu-item-iccId', menu.iccId]
          ]
        }));
      });

      _backHandler = updateSelection.bind(null, message);
    }

    function onSelectionHelpItemClick(message, event) {
      var identifier = event.target.getAttribute('stk-help-item-identifier');
      window.DUMP('sendStkHelpMenuSelection: ', identifier);

      responseSTKCommand(message, {
        resultCode: iccManager.STK_RESULT_HELP_INFO_REQUIRED,
        itemIdentifier: identifier
      });
      stkLastSelectedText = event.target.textContent;
    }

    /**
     * Auxiliar methods
     */
    function showTitle(titleL10n) {
      // If the application is automatically opened (no come from main menu)
      if (!stkOpenAppName) {
        stkOpenAppName = titleL10n;
      }
      localizeElement(iccStkHeader, stkOpenAppName);

      // Show section
      if (stkOpenAppName != titleL10n) {
        localizeElement(iccStkSubheader, titleL10n);
        iccStkSubheader.parentNode.classList.remove('hiddenheader');
        iccStkSubheader.classList.remove('hidden');
      } else {
        localizeElement(iccStkSubheader, {raw: ''});
        iccStkSubheader.parentNode.classList.add('hiddenheader');
        iccStkSubheader.classList.add('hidden');
      }
    }

    function clearList() {
      while (iccStkList.hasChildNodes()) {
        iccStkList.removeChild(iccStkList.lastChild);
      }
    }

    function buildMenuEntry(entry) {
      var li = document.createElement('li');

      if (entry.nai) {
        var small = document.createElement('small');
        localizeElement(small, entry.nai);
        li.appendChild(small);
      }

      if (entry.icon) {
        var iconContainer = document.createElement('span');
        iconContainer.appendChild(STKHelper.getIconCanvas(entry.icon));
        li.appendChild(iconContainer);
      }

      var a = document.createElement('a');
      a.id = entry.id;
      entry.attributes.forEach(function attrIterator(attr) {
        a.setAttribute(attr[0], attr[1]);
      });
      localizeElement(a, entry.text);
      a.onclick = entry.onclick;
      a.href = '#icc';
      li.appendChild(a);
      return li;
    }
  })();

  window.dispatchEvent(new CustomEvent('iccPageLoaded', {
    detail: {}
  }));
});