'use strict';

var getIconId = require('./icon_id');

/**
 * Abstraction around homescreen.
 * @constructor
 */
function VerticalHome(client) {
  this.client = client;
  this.system = client.loader.getAppClass('system');
}

/**
 * @type String Origin of VerticalHome app
 */
VerticalHome.URL = 'app://verticalhome.gaiamobile.org';

VerticalHome.Selectors = {
  grid: '#icons',
  editHeaderText: '#edit-header h1',
  editHeaderDone: '#exit-edit-mode',
  editGroup: '#edit-group',
  editGroupTitle: '#edit-group-title',
  editGroupSave: '#edit-group-save',
  editGroupTitleClear: '#edit-group-title-clear',
  search: '#search',
  firstIcon: '#icons div.icon:not(.placeholder)',
  groupHeader: '#icons .group .header',
  groupTitle: '#icons .group .header .title',
  groupBackground: '#icons .group .background',
  groupToggle: '#icons .group .toggle',
  dividers: '#icons section.divider',
  contextmenu: '#contextmenu-dialog',
  themeColor: 'head meta[name="theme-color"]',
  placeholders: '#icons .placeholder'
};

/**
 * Launches our new homescreen and focuses on it.
 */
VerticalHome.prototype = {

  URL: VerticalHome.URL,
  Selectors: VerticalHome.Selectors,

  get numIcons() {
    return this.client.findElements(VerticalHome.Selectors.firstIcon).length;
  },

  get numDividers() {
    return this.dividers.length;
  },

  get dividers() {
    return this.client.findElements(VerticalHome.Selectors.dividers);
  },

  get contextMenu() {
    return this.client.findElement(VerticalHome.Selectors.contextmenu);
  },

  /**
  Fetch a particular type of a gaia-confirm dialog.

  @param {String} type of dialog.
  */
  getConfirmDialog: function(type) {
    var selector = 'gaia-confirm[data-type="' + type + '"]';
    return this.client.helper.waitForElement(selector);
  },

  /**
  Click confirm on a particular type of confirmation dialog.

  @param {String} type of dialog.
  @param {String} selector of the button. Defaults to .confirm.
  */
  confirmDialog: function(type, button) {
    var dialog = this.getConfirmDialog(type);
    var confirm;

    this.client.waitFor(function() {
     confirm = dialog.findElement(button || '.confirm');
     return confirm && confirm.displayed();
    });

    // XXX: Hack to use faster polling
    var quickly = this.client.scope({ searchTimeout: 50 });
    confirm.client = quickly;

    // tricky logic to ensure the dialog has been removed and clicked
    this.client.waitFor(function() {
      try {
        // click the dialog to dismiss it
        confirm.click();
        // ensure it is either hidden or hits the stale element ref
        return !confirm.displayed();
      } catch (e) {
        if (e.type === 'StaleElementReference') {
          // element was successfully removed
          return true;
        }
        throw e;
      }
    });
  },

  /**
   * Enter edit mode by long pressing a given icon, or the first icon on the
   * grid if not specified.
   */
  enterEditMode: function(icon) {
    var actions = this.client.loader.getActions();
    var firstIcon = icon ||
      this.client.helper.waitForElement(VerticalHome.Selectors.firstIcon);

    actions.longPress(firstIcon, 1).perform();
    this.client.helper.waitForElement(VerticalHome.Selectors.editHeaderText);
  },

  /**
   * Exits the edit mode by long-pressing the done button and waiting for it
   * to disappear.
   */
  exitEditMode: function() {
    var done = this.client.findElement(VerticalHome.Selectors.editHeaderDone);
    done.click();
    this.client.helper.waitForElementToDisappear(done);
  },

  /**
   * Emulates pressing of the hardware home button.
   */
  pressHomeButton: function() {
    this.client.executeScript(function() {
      var home = new CustomEvent('home');
      window.dispatchEvent(home);
    });
  },

  focusRocketBar: function() {
    this.client.helper.waitForElement(VerticalHome.Selectors.search).tap();
    this.client.switchToFrame();
  },

  /**
  Tap an app icon in the homescreen

  @param {String} manifestURL full manifest url path.
  */
  launchApp: function(manifestURL) {
    // switch back to the homescreen
    this.client.switchToFrame();
    this.client.switchToFrame(this.system.getHomescreenIframe());

    // tap the app in the homescreen
    var newApp = this.getIcon(manifestURL);
    newApp.tap();

    // go to the system app
    this.client.switchToFrame();
  },

  /**
  Tap an app icon and switch to it's application iframe.

  @param {String} manifestURL full manifest url path.
  */
  launchAndSwitchToApp: function(manifestURL) {
    var client = this.client.scope({ searchTimeout: 100 });
    var frame;
    client.waitFor(function() {
      this.launchApp(manifestURL);
      // wait for the app to show up
      try {
        frame = client.findElement(
          'iframe[mozapp="' + manifestURL + '"]'
        );
      } catch (e) {
        // try again...
        return false;
      }
      client.switchToFrame(frame);
      return true;
    }.bind(this));
  },

  /**
  Restart the homescreen then refocus on it.
  */
  restart: function() {
    this.client.executeScript(function() {
      window.close();
    });

    // initialize our frames again since we killed the iframe
    this.client.switchToFrame();
    this.client.switchToFrame(this.system.getHomescreenIframe());
  },

  /**
  Find and return every id for all the items on the grid... Each element
  can be used with `.getIcon` to find the element for a given id.

  @return {Array[String]}
  */
  getIconIdentifiers: function() {
    return this.client.findElements('[data-identifier]').map(function(el) {
      return getIconId(el);
    });
  },

  /**
  Fetch an icon element on the homescreen.

  @param {String} manifestURL must be a fully qualified manifest url.
  @return {Marionette.Element}
  */
  getIcon: function(manifestUrl, entryPoint) {
    return this.client.helper.waitForElement(
      '[data-identifier*="' + manifestUrl +
      (entryPoint ? '-' + entryPoint : '') + '"]'
    );
  },

  /**
  Fetch the nth icon on the homescreen.

  @param {number} the icon number we want
  @return {Marionette.Element}
   */
  getNthIcon: function(number) {
    return this.client.helper.waitForElement(
      '.icon:nth-of-type(' + number + ')'
    );
  },

  /**
  Get the the current meta=theme-color of the homescreen

  @return {String}
  */
  getThemeColor: function() {
    var meta = this.client.findElement(VerticalHome.Selectors.themeColor);
    return meta.getAttribute('content');
  },

  /**
   * Waits for the homescreen to launch and switches to the frame.
   */
  waitForLaunch: function() {
    this.client.helper.waitForElement('body');
    this.client.apps.switchToApp(VerticalHome.URL);
  },

  /**
   * Gets a localized application name from a manifest.
   * @param {String} app to open
   * @param {String} entryPoint to open
   * @param {String} locale
   */
  localizedAppName: function(app, entryPoint, locale) {
    if (!locale) {
      locale = entryPoint;
      entryPoint = null;
    }

    var file = 'app://' + app + '.gaiamobile.org/manifest.webapp';
    // use a chrome-scoped Marionette client for the cross-domain XHR
    var chromeClient = this.client.scope({context: 'chrome'});
    var manifest = chromeClient.executeAsyncScript(function(file) {
      var xhr = new XMLHttpRequest();
      xhr.open('GET', file, true);
      xhr.onload = function(o) {
        var data = JSON.parse(xhr.response);
        marionetteScriptFinished(data);
      };
      xhr.send(null);
    }, [file]);

    var locales;
    if (entryPoint) {
      locales = manifest.entry_points[entryPoint].locales;
    } else {
      locales = manifest.locales;
    }

    if (!locales) {
      return false;
    }

    if (locale.indexOf('-x-ps') > -1) {
      return this.client.executeScript(function(locale, name) {
        var mozL10n = window.wrappedJSObject.navigator.mozL10n;
        return mozL10n.qps[locale].translate(name);
      }, [locale, locales['en-US'].name]);
    }

    return locales[locale].name;
  },

  /**
   * Returns a localized string from a properties file.
   * @param {String} key of the string to lookup.
   */
  l10n: function(key) {
    var string = this.client.executeScript(function(key) {
      return window.wrappedJSObject.navigator.mozL10n.get(key);
    }, [key]);

    return string;
  },

  containsClass: function(selector, clazz) {
    return this.client.executeScript(function(selector, clazz) {
      return document.querySelector(selector).classList.contains(clazz);
    }, [selector, clazz]);
  },

  /**
   * Helper function to move an icon to a specified index. Currently uses
   * executeScript() and manually fiddles with the homescreen grid logic,
   * this is because scripted drag/drop does not work too well within the
   * vertically scrolling homescreen on b2g desktop.
   * @param {Element} icon The grid icon object.
   * @param {Integer} index The position to insert the icon into.
   */
  moveIconToIndex: function(icon, index) {
    this.client.executeScript(function(identifier, newPos) {
      var app = window.wrappedJSObject.app;
      var icon = app.grid.getIcon(identifier);
      app.grid.moveTo(icon.detail.index, newPos);
      app.grid.render();
    }, [icon.getAttribute('data-identifier'), index]);

    // Wait for the icon to animate into place
    var actions = this.client.loader.getActions();
    actions.wait(1).perform();
  },

  /**
   * Opens the context menu by long-pressing on the first available placeholder.
   * If there is no placeholder, the first icon will be dragged to the top of
   * the grid to create a new group, and thus new placeholders.
   */
  openContextMenu: function() {
    var actions = this.client.loader.getActions();
    var body = this.client.findElement('body');
    actions.longPress(body, 1).perform();
  }
};

module.exports = VerticalHome;