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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

this.EXPORTED_SYMBOLS = ["Social", "OpenGraphBuilder",
                         "DynamicResizeWatcher", "sizeSocialPanelToContent"];

const Ci = Components.interfaces;
const Cc = Components.classes;
const Cu = Components.utils;

// The minimum sizes for the auto-resize panel code, minimum size necessary to
// properly show the error page in the panel.
const PANEL_MIN_HEIGHT = 190;
const PANEL_MIN_WIDTH = 330;

Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");

XPCOMUtils.defineLazyModuleGetter(this, "CustomizableUI",
  "resource:///modules/CustomizableUI.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "SocialService",
  "resource:///modules/SocialService.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PageMetadata",
  "resource://gre/modules/PageMetadata.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
  "resource://gre/modules/PlacesUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Promise",
  "resource://gre/modules/Promise.jsm");


this.Social = {
  initialized: false,
  lastEventReceived: 0,
  providers: [],
  _disabledForSafeMode: false,

  init: function Social_init() {
    this._disabledForSafeMode = Services.appinfo.inSafeMode && this.enabled;
    let deferred = Promise.defer();

    if (this.initialized) {
      deferred.resolve(true);
      return deferred.promise;
    }
    this.initialized = true;
    // if SocialService.hasEnabledProviders, retreive the providers so the
    // front-end can generate UI
    if (SocialService.hasEnabledProviders) {
      // Retrieve the current set of providers, and set the current provider.
      SocialService.getOrderedProviderList(function (providers) {
        Social._updateProviderCache(providers);
        Social._updateEnabledState(SocialService.enabled);
        deferred.resolve(false);
      });
    } else {
      deferred.resolve(false);
    }

    // Register an observer for changes to the provider list
    SocialService.registerProviderListener(function providerListener(topic, origin, providers) {
      // An engine change caused by adding/removing a provider should notify.
      // any providers we receive are enabled in the AddonsManager
      if (topic == "provider-installed" || topic == "provider-uninstalled") {
        // installed/uninstalled do not send the providers param
        Services.obs.notifyObservers(null, "social:" + topic, origin);
        return;
      }
      if (topic == "provider-enabled") {
        Social._updateProviderCache(providers);
        Social._updateEnabledState(true);
        Services.obs.notifyObservers(null, "social:" + topic, origin);
        return;
      }
      if (topic == "provider-disabled") {
        // a provider was removed from the list of providers, update states
        Social._updateProviderCache(providers);
        Social._updateEnabledState(providers.length > 0);
        Services.obs.notifyObservers(null, "social:" + topic, origin);
        return;
      }
      if (topic == "provider-update") {
        // a provider has self-updated its manifest, we need to update our cache
        // and reload the provider.
        Social._updateProviderCache(providers);
        let provider = Social._getProviderFromOrigin(origin);
        provider.reload();
      }
    });
    return deferred.promise;
  },

  _updateEnabledState: function(enable) {
    for (let p of Social.providers) {
      p.enabled = enable;
    }
  },

  // Called to update our cache of providers and set the current provider
  _updateProviderCache: function (providers) {
    this.providers = providers;
    Services.obs.notifyObservers(null, "social:providers-changed", null);
  },

  get enabled() {
    return !this._disabledForSafeMode && this.providers.length > 0;
  },

  _getProviderFromOrigin: function (origin) {
    for (let p of this.providers) {
      if (p.origin == origin) {
        return p;
      }
    }
    return null;
  },

  getManifestByOrigin: function(origin) {
    return SocialService.getManifestByOrigin(origin);
  },

  installProvider: function(data, installCallback, options={}) {
    SocialService.installProvider(data, installCallback, options);
  },

  uninstallProvider: function(origin, aCallback) {
    SocialService.uninstallProvider(origin, aCallback);
  },

  // Activation functionality
  activateFromOrigin: function (origin, callback) {
    // It's OK if the provider has already been activated - we still get called
    // back with it.
    SocialService.enableProvider(origin, callback);
  }
};

function sizeSocialPanelToContent(panel, iframe, requestedSize) {
  let doc = iframe.contentDocument;
  if (!doc || !doc.body) {
    return;
  }
  // We need an element to use for sizing our panel.  See if the body defines
  // an id for that element, otherwise use the body itself.
  let body = doc.body;
  let docEl = doc.documentElement;
  let bodyId = body.getAttribute("contentid");
  if (bodyId) {
    body = doc.getElementById(bodyId) || doc.body;
  }
  // offsetHeight/Width don't include margins, so account for that.
  let cs = doc.defaultView.getComputedStyle(body);
  let width = Math.max(PANEL_MIN_WIDTH, docEl.offsetWidth);
  let height = Math.max(PANEL_MIN_HEIGHT, docEl.offsetHeight);
  // if the panel is preloaded prior to being shown, cs will be null.  in that
  // case use the minimum size for the panel until it is shown.
  if (cs) {
    let computedHeight = parseInt(cs.marginTop) + body.offsetHeight + parseInt(cs.marginBottom);
    height = Math.max(computedHeight, height);
    let computedWidth = parseInt(cs.marginLeft) + body.offsetWidth + parseInt(cs.marginRight);
    width = Math.max(computedWidth, width);
  }

  // if our scrollHeight is still larger than the iframe, the css calculations
  // above did not work for this site, increase the height. This can happen if
  // the site increases its height for additional UI.
  if (docEl.scrollHeight > iframe.boxObject.height)
    height = docEl.scrollHeight;

  // if a size was defined in the manifest use it as a minimum
  if (requestedSize) {
    if (requestedSize.height)
      height = Math.max(height, requestedSize.height);
    if (requestedSize.width)
      width = Math.max(width, requestedSize.width);
  }

  // add the extra space used by the panel (toolbar, borders, etc) if the iframe
  // has been loaded
  if (iframe.boxObject.width && iframe.boxObject.height) {
    // add extra space the panel needs if any
    width += panel.boxObject.width - iframe.boxObject.width;
    height += panel.boxObject.height - iframe.boxObject.height;
  }

  // using panel.sizeTo will ignore css transitions, set size via style
  if (Math.abs(panel.boxObject.width - width) >= 2)
    panel.style.width = width + "px";
  if (Math.abs(panel.boxObject.height - height) >= 2)
    panel.style.height = height + "px";
}

function DynamicResizeWatcher() {
  this._mutationObserver = null;
}

DynamicResizeWatcher.prototype = {
  start: function DynamicResizeWatcher_start(panel, iframe, requestedSize) {
    this.stop(); // just in case...
    let doc = iframe.contentDocument;
    this._mutationObserver = new iframe.contentWindow.MutationObserver((mutations) => {
      sizeSocialPanelToContent(panel, iframe, requestedSize);
    });
    // Observe anything that causes the size to change.
    let config = {attributes: true, characterData: true, childList: true, subtree: true};
    this._mutationObserver.observe(doc, config);
    // and since this may be setup after the load event has fired we do an
    // initial resize now.
    sizeSocialPanelToContent(panel, iframe, requestedSize);
  },
  stop: function DynamicResizeWatcher_stop() {
    if (this._mutationObserver) {
      try {
        this._mutationObserver.disconnect();
      } catch (ex) {
        // may get "TypeError: can't access dead object" which seems strange,
        // but doesn't seem to indicate a real problem, so ignore it...
      }
      this._mutationObserver = null;
    }
  }
}


this.OpenGraphBuilder = {
  generateEndpointURL: function(URLTemplate, pageData) {
    // support for existing oexchange style endpoints by supporting their
    // querystring arguments. parse the query string template and do
    // replacements where necessary the query names may be different than ours,
    // so we could see u=%{url} or url=%{url}
    let [endpointURL, queryString] = URLTemplate.split("?");
    let query = {};
    if (queryString) {
      queryString.split('&').forEach(function (val) {
        let [name, value] = val.split('=');
        let p = /%\{(.+)\}/.exec(value);
        if (!p) {
          // preserve non-template query vars
          query[name] = value;
        } else if (pageData[p[1]]) {
          if (p[1] == "previews")
            query[name] = pageData[p[1]][0];
          else
            query[name] = pageData[p[1]];
        } else if (p[1] == "body") {
          // build a body for emailers
          let body = "";
          if (pageData.title)
            body += pageData.title + "\n\n";
          if (pageData.description)
            body += pageData.description + "\n\n";
          if (pageData.text)
            body += pageData.text + "\n\n";
          body += pageData.url;
          query["body"] = body;
        }
      });
      // if the url template doesn't have title and no text was provided, add the title as the text.
      if (!query.text && !query.title && pageData.title) {
        query.text = pageData.title;
      }
    }
    var str = [];
    for (let p in query)
       str.push(p + "=" + encodeURIComponent(query[p]));
    if (str.length)
      endpointURL = endpointURL + "?" + str.join("&");
    return endpointURL;
  },
};