/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set sts=2 sw=2 et tw=80: */
"use strict";

XPCOMUtils.defineLazyModuleGetter(this, "CustomizableUI",
                                  "resource:///modules/CustomizableUI.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "clearTimeout",
                                  "resource://gre/modules/Timer.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "setTimeout",
                                  "resource://gre/modules/Timer.jsm");

XPCOMUtils.defineLazyServiceGetter(this, "DOMUtils",
                                   "@mozilla.org/inspector/dom-utils;1",
                                   "inIDOMUtils");

Cu.import("resource://devtools/shared/event-emitter.js");
Cu.import("resource://gre/modules/ExtensionUtils.jsm");
Cu.import("resource://gre/modules/Task.jsm");

var {
  EventManager,
  IconDetails,
} = ExtensionUtils;

const POPUP_PRELOAD_TIMEOUT_MS = 200;

const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";

function isAncestorOrSelf(target, node) {
  for (; node; node = node.parentNode) {
    if (node === target) {
      return true;
    }
  }
  return false;
}

// WeakMap[Extension -> BrowserAction]
var browserActionMap = new WeakMap();

// Responsible for the browser_action section of the manifest as well
// as the associated popup.
function BrowserAction(options, extension) {
  this.extension = extension;

  let widgetId = makeWidgetId(extension.id);
  this.id = `${widgetId}-browser-action`;
  this.viewId = `PanelUI-webext-${widgetId}-browser-action-view`;
  this.widget = null;

  this.pendingPopup = null;
  this.pendingPopupTimeout = null;

  this.tabManager = TabManager.for(extension);

  this.defaults = {
    enabled: true,
    title: options.default_title || extension.name,
    badgeText: "",
    badgeBackgroundColor: null,
    icon: IconDetails.normalize({path: options.default_icon}, extension),
    popup: options.default_popup || "",
  };

  this.browserStyle = options.browser_style || false;
  if (options.browser_style === null) {
    this.extension.logger.warn("Please specify whether you want browser_style " +
                               "or not in your browser_action options.");
  }

  this.tabContext = new TabContext(tab => Object.create(this.defaults),
                                   extension);

  EventEmitter.decorate(this);
}

BrowserAction.prototype = {
  build() {
    let widget = CustomizableUI.createWidget({
      id: this.id,
      viewId: this.viewId,
      type: "view",
      removable: true,
      label: this.defaults.title || this.extension.name,
      tooltiptext: this.defaults.title || "",
      defaultArea: CustomizableUI.AREA_NAVBAR,

      onBeforeCreated: document => {
        let view = document.createElementNS(XUL_NS, "panelview");
        view.id = this.viewId;
        view.setAttribute("flex", "1");

        document.getElementById("PanelUI-multiView").appendChild(view);
      },

      onDestroyed: document => {
        let view = document.getElementById(this.viewId);
        if (view) {
          this.clearPopup();
          CustomizableUI.hidePanelForNode(view);
          view.remove();
        }
      },

      onCreated: node => {
        node.classList.add("badged-button");
        node.classList.add("webextension-browser-action");
        node.setAttribute("constrain-size", "true");

        node.onmousedown = event => this.handleEvent(event);

        this.updateButton(node, this.defaults);
      },

      onViewShowing: event => {
        let document = event.target.ownerDocument;
        let tabbrowser = document.defaultView.gBrowser;

        let tab = tabbrowser.selectedTab;
        let popupURL = this.getProperty(tab, "popup");
        this.tabManager.addActiveTabPermission(tab);

        // Popups are shown only if a popup URL is defined; otherwise
        // a "click" event is dispatched. This is done for compatibility with the
        // Google Chrome onClicked extension API.
        if (popupURL) {
          try {
            let popup = this.getPopup(document.defaultView, popupURL);
            event.detail.addBlocker(popup.attach(event.target));
          } catch (e) {
            Cu.reportError(e);
            event.preventDefault();
          }
        } else {
          // This isn't not a hack, but it seems to provide the correct behavior
          // with the fewest complications.
          event.preventDefault();
          this.emit("click");
        }
      },
    });

    this.tabContext.on("tab-select", // eslint-disable-line mozilla/balanced-listeners
                       (evt, tab) => { this.updateWindow(tab.ownerGlobal); });

    this.widget = widget;
  },

  /**
   * Triggers this browser action for the given window, with the same effects as
   * if it were clicked by a user.
   *
   * This has no effect if the browser action is disabled for, or not
   * present in, the given window.
   */
  triggerAction: Task.async(function* (window) {
    let popup = ViewPopup.for(this.extension, window);
    if (popup) {
      popup.closePopup();
      return;
    }

    let widget = this.widget.forWindow(window);
    let tab = window.gBrowser.selectedTab;

    if (!widget || !this.getProperty(tab, "enabled")) {
      return;
    }

    // Popups are shown only if a popup URL is defined; otherwise
    // a "click" event is dispatched. This is done for compatibility with the
    // Google Chrome onClicked extension API.
    if (this.getProperty(tab, "popup")) {
      if (this.widget.areaType == CustomizableUI.TYPE_MENU_PANEL) {
        yield window.PanelUI.show();
      }

      let event = new window.CustomEvent("command", {bubbles: true, cancelable: true});
      widget.node.dispatchEvent(event);
    } else {
      this.emit("click");
    }
  }),

  handleEvent(event) {
    let button = event.target;
    let window = button.ownerDocument.defaultView;

    switch (event.type) {
      case "mousedown":
        if (event.button == 0) {
          // Begin pre-loading the browser for the popup, so it's more likely to
          // be ready by the time we get a complete click.
          let tab = window.gBrowser.selectedTab;
          let popupURL = this.getProperty(tab, "popup");
          let enabled = this.getProperty(tab, "enabled");

          if (popupURL && enabled) {
            // Add permission for the active tab so it will exist for the popup.
            // Store the tab to revoke the permission during clearPopup.
            if (!this.pendingPopup && !this.tabManager.hasActiveTabPermission(tab)) {
              this.tabManager.addActiveTabPermission(tab);
              this.tabToRevokeDuringClearPopup = tab;
            }

            this.pendingPopup = this.getPopup(window, popupURL);
            window.addEventListener("mouseup", this, true);
          } else {
            this.clearPopup();
          }
        }
        break;

      case "mouseup":
        if (event.button == 0) {
          this.clearPopupTimeout();
          // If we have a pending pre-loaded popup, cancel it after we've waited
          // long enough that we can be relatively certain it won't be opening.
          if (this.pendingPopup) {
            let {node} = this.widget.forWindow(window);
            if (isAncestorOrSelf(node, event.originalTarget)) {
              this.pendingPopupTimeout = setTimeout(() => this.clearPopup(),
                                                    POPUP_PRELOAD_TIMEOUT_MS);
            } else {
              this.clearPopup();
            }
          }
        }
        break;
    }
  },

  /**
   * Returns a potentially pre-loaded popup for the given URL in the given
   * window. If a matching pre-load popup already exists, returns that.
   * Otherwise, initializes a new one.
   *
   * If a pre-load popup exists which does not match, it is destroyed before a
   * new one is created.
   *
   * @param {Window} window
   *        The browser window in which to create the popup.
   * @param {string} popupURL
   *        The URL to load into the popup.
   * @returns {ViewPopup}
   */
  getPopup(window, popupURL) {
    this.clearPopupTimeout();
    let {pendingPopup} = this;
    this.pendingPopup = null;

    if (pendingPopup) {
      if (pendingPopup.window === window && pendingPopup.popupURL === popupURL) {
        return pendingPopup;
      }
      pendingPopup.destroy();
    }

    let fixedWidth = this.widget.areaType == CustomizableUI.TYPE_MENU_PANEL;
    return new ViewPopup(this.extension, window, popupURL, this.browserStyle, fixedWidth);
  },

  /**
   * Clears any pending pre-loaded popup and related timeouts.
   */
  clearPopup() {
    this.clearPopupTimeout();
    if (this.pendingPopup) {
      if (this.tabToRevokeDuringClearPopup) {
        this.tabManager.revokeActiveTabPermission(this.tabToRevokeDuringClearPopup);
        this.tabToRevokeDuringClearPopup = null;
      }
      this.pendingPopup.destroy();
      this.pendingPopup = null;
    }
  },

  /**
   * Clears any pending timeouts to clear stale, pre-loaded popups.
   */
  clearPopupTimeout() {
    if (this.pendingPopup) {
      this.pendingPopup.window.removeEventListener("mouseup", this, true);
    }

    if (this.pendingPopupTimeout) {
      clearTimeout(this.pendingPopupTimeout);
      this.pendingPopupTimeout = null;
    }
  },

  // Update the toolbar button |node| with the tab context data
  // in |tabData|.
  updateButton(node, tabData) {
    let title = tabData.title || this.extension.name;
    node.setAttribute("tooltiptext", title);
    node.setAttribute("label", title);

    if (tabData.badgeText) {
      node.setAttribute("badge", tabData.badgeText);
    } else {
      node.removeAttribute("badge");
    }

    if (tabData.enabled) {
      node.removeAttribute("disabled");
    } else {
      node.setAttribute("disabled", "true");
    }

    let badgeNode = node.ownerDocument.getAnonymousElementByAttribute(node,
                                        "class", "toolbarbutton-badge");
    if (badgeNode) {
      let color = tabData.badgeBackgroundColor;
      if (color) {
        color = `rgba(${color[0]}, ${color[1]}, ${color[2]}, ${color[3] / 255})`;
      }
      badgeNode.style.backgroundColor = color || "";
    }

    const LEGACY_CLASS = "toolbarbutton-legacy-addon";
    node.classList.remove(LEGACY_CLASS);

    let baseSize = 16;
    let {icon, size} = IconDetails.getPreferredIcon(tabData.icon, this.extension, baseSize);

    // If the best available icon size is not divisible by 16, check if we have
    // an 18px icon to fall back to, and trim off the padding instead.
    if (size % 16 && !icon.endsWith(".svg")) {
      let result = IconDetails.getPreferredIcon(tabData.icon, this.extension, 18);

      if (result.size % 18 == 0) {
        baseSize = 18;
        icon = result.icon;
        node.classList.add(LEGACY_CLASS);
      }
    }

    // These URLs should already be properly escaped, but make doubly sure CSS
    // string escape characters are escaped here, since they could lead to a
    // sandbox break.
    let escape = str => str.replace(/[\\\s"]/g, encodeURIComponent);

    let getIcon = size => escape(IconDetails.getPreferredIcon(tabData.icon, this.extension, size).icon);

    node.setAttribute("style", `
      --webextension-menupanel-image: url("${getIcon(32)}");
      --webextension-menupanel-image-2x: url("${getIcon(64)}");
      --webextension-toolbar-image: url("${escape(icon)}");
      --webextension-toolbar-image-2x: url("${getIcon(baseSize * 2)}");
    `);
  },

  // Update the toolbar button for a given window.
  updateWindow(window) {
    let widget = this.widget.forWindow(window);
    if (widget) {
      let tab = window.gBrowser.selectedTab;
      this.updateButton(widget.node, this.tabContext.get(tab));
    }
  },

  // Update the toolbar button when the extension changes the icon,
  // title, badge, etc. If it only changes a parameter for a single
  // tab, |tab| will be that tab. Otherwise it will be null.
  updateOnChange(tab) {
    if (tab) {
      if (tab.selected) {
        this.updateWindow(tab.ownerGlobal);
      }
    } else {
      for (let window of WindowListManager.browserWindows()) {
        this.updateWindow(window);
      }
    }
  },

  // tab is allowed to be null.
  // prop should be one of "icon", "title", "badgeText", "popup", or "badgeBackgroundColor".
  setProperty(tab, prop, value) {
    if (tab == null) {
      this.defaults[prop] = value;
    } else if (value != null) {
      this.tabContext.get(tab)[prop] = value;
    } else {
      delete this.tabContext.get(tab)[prop];
    }

    this.updateOnChange(tab);
  },

  // tab is allowed to be null.
  // prop should be one of "title", "badgeText", "popup", or "badgeBackgroundColor".
  getProperty(tab, prop) {
    if (tab == null) {
      return this.defaults[prop];
    }
    return this.tabContext.get(tab)[prop];
  },

  shutdown() {
    this.tabContext.shutdown();
    CustomizableUI.destroyWidget(this.id);
  },
};

BrowserAction.for = (extension) => {
  return browserActionMap.get(extension);
};

global.browserActionFor = BrowserAction.for;

/* eslint-disable mozilla/balanced-listeners */
extensions.on("manifest_browser_action", (type, directive, extension, manifest) => {
  let browserAction = new BrowserAction(manifest.browser_action, extension);
  browserAction.build();
  browserActionMap.set(extension, browserAction);
});

extensions.on("shutdown", (type, extension) => {
  if (browserActionMap.has(extension)) {
    browserActionMap.get(extension).shutdown();
    browserActionMap.delete(extension);
  }
});
/* eslint-enable mozilla/balanced-listeners */

extensions.registerSchemaAPI("browserAction", "addon_parent", context => {
  let {extension} = context;
  return {
    browserAction: {
      onClicked: new EventManager(context, "browserAction.onClicked", fire => {
        let listener = () => {
          let tab = TabManager.activeTab;
          fire(TabManager.convert(extension, tab));
        };
        BrowserAction.for(extension).on("click", listener);
        return () => {
          BrowserAction.for(extension).off("click", listener);
        };
      }).api(),

      enable: function(tabId) {
        let tab = tabId !== null ? TabManager.getTab(tabId, context) : null;
        BrowserAction.for(extension).setProperty(tab, "enabled", true);
      },

      disable: function(tabId) {
        let tab = tabId !== null ? TabManager.getTab(tabId, context) : null;
        BrowserAction.for(extension).setProperty(tab, "enabled", false);
      },

      setTitle: function(details) {
        let tab = details.tabId !== null ? TabManager.getTab(details.tabId, context) : null;

        let title = details.title;
        // Clear the tab-specific title when given a null string.
        if (tab && title == "") {
          title = null;
        }
        BrowserAction.for(extension).setProperty(tab, "title", title);
      },

      getTitle: function(details) {
        let tab = details.tabId !== null ? TabManager.getTab(details.tabId, context) : null;

        let title = BrowserAction.for(extension).getProperty(tab, "title");
        return Promise.resolve(title);
      },

      setIcon: function(details) {
        let tab = details.tabId !== null ? TabManager.getTab(details.tabId, context) : null;

        let icon = IconDetails.normalize(details, extension, context);
        BrowserAction.for(extension).setProperty(tab, "icon", icon);
      },

      setBadgeText: function(details) {
        let tab = details.tabId !== null ? TabManager.getTab(details.tabId, context) : null;

        BrowserAction.for(extension).setProperty(tab, "badgeText", details.text);
      },

      getBadgeText: function(details) {
        let tab = details.tabId !== null ? TabManager.getTab(details.tabId, context) : null;

        let text = BrowserAction.for(extension).getProperty(tab, "badgeText");
        return Promise.resolve(text);
      },

      setPopup: function(details) {
        let tab = details.tabId !== null ? TabManager.getTab(details.tabId, context) : null;

        // Note: Chrome resolves arguments to setIcon relative to the calling
        // context, but resolves arguments to setPopup relative to the extension
        // root.
        // For internal consistency, we currently resolve both relative to the
        // calling context.
        let url = details.popup && context.uri.resolve(details.popup);
        if (url && !context.checkLoadURL(url)) {
          return Promise.reject({message: `Access denied for URL ${url}`});
        }
        BrowserAction.for(extension).setProperty(tab, "popup", url);
      },

      getPopup: function(details) {
        let tab = details.tabId !== null ? TabManager.getTab(details.tabId, context) : null;

        let popup = BrowserAction.for(extension).getProperty(tab, "popup");
        return Promise.resolve(popup);
      },

      setBadgeBackgroundColor: function(details) {
        let tab = details.tabId !== null ? TabManager.getTab(details.tabId, context) : null;
        let color = details.color;
        if (!Array.isArray(color)) {
          let col = DOMUtils.colorToRGBA(color);
          color = col && [col.r, col.g, col.b, Math.round(col.a * 255)];
        }
        BrowserAction.for(extension).setProperty(tab, "badgeBackgroundColor", color);
      },

      getBadgeBackgroundColor: function(details, callback) {
        let tab = details.tabId !== null ? TabManager.getTab(details.tabId, context) : null;

        let color = BrowserAction.for(extension).getProperty(tab, "badgeBackgroundColor");
        return Promise.resolve(color || [0xd9, 0, 0, 255]);
      },
    },
  };
});
