/* vim: set ts=2 sw=2 sts=2 et tw=80: */
/* 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";

var EXPORTED_SYMBOLS = ["FindBarChild"];

const {ActorChild} = ChromeUtils.import("resource://gre/modules/ActorChild.jsm");
const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
const {XPCOMUtils} = ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");

ChromeUtils.defineModuleGetter(this, "BrowserUtils",
                               "resource://gre/modules/BrowserUtils.jsm");

class FindBarChild extends ActorChild {
  constructor(dispatcher) {
    super(dispatcher);

    this._findKey = null;

    XPCOMUtils.defineLazyProxy(this, "FindBarContent", () => {
      let tmp = {};
      ChromeUtils.import("resource://gre/modules/FindBarContent.jsm", tmp);
      return new tmp.FindBarContent(this.mm);
    }, {inQuickFind: false, inPassThrough: false});
  }

  /**
   * Check whether this key event will start the findbar in the parent,
   * in which case we should pass any further key events to the parent to avoid
   * them being lost.
   * @param aEvent the key event to check.
   */
  eventMatchesFindShortcut(aEvent) {
    if (!this._findKey) {
      this._findKey = Services.cpmm.sharedData.get("Findbar:Shortcut");
      if (!this._findKey) {
        return false;
      }
    }
    for (let k in this._findKey) {
      if (this._findKey[k] != aEvent[k]) {
        return false;
      }
    }
    return true;
  }

  handleEvent(event) {
    if (event.type == "keypress") {
      this.onKeypress(event);
    }
  }

  onKeypress(event) {
    let {FindBarContent} = this;

    if (!FindBarContent.inPassThrough &&
        this.eventMatchesFindShortcut(event)) {
      return FindBarContent.start(event);
    }

    // disable FAYT in about:blank to prevent FAYT opening unexpectedly.
    let location = this.content.location.href;
    if (location == "about:blank") {
      return null;
    }

    if (event.ctrlKey || event.altKey || event.metaKey || event.defaultPrevented ||
        !BrowserUtils.mimeTypeIsTextBased(this.content.document.contentType) ||
        !BrowserUtils.canFindInPage(location)) {
      return null;
    }

    if (FindBarContent.inPassThrough || FindBarContent.inQuickFind) {
      return FindBarContent.onKeypress(event);
    }

    if (event.charCode && BrowserUtils.shouldFastFind(event.target)) {
      let key = String.fromCharCode(event.charCode);
      if ((key == "/" || key == "'") && FindBarChild.manualFAYT) {
        return FindBarContent.startQuickFind(event);
      }
      if (key != " " && FindBarChild.findAsYouType) {
        return FindBarContent.startQuickFind(event, true);
      }
    }
    return null;
  }
}

XPCOMUtils.defineLazyPreferenceGetter(FindBarChild, "findAsYouType",
  "accessibility.typeaheadfind");
XPCOMUtils.defineLazyPreferenceGetter(FindBarChild, "manualFAYT",
  "accessibility.typeaheadfind.manual");