/* 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";

/**

 * The source editor exposes XUL commands that can be used when embedded in a XUL

 * document. This controller drives the availability and behavior of the commands. When

 * the editor input field is focused, this controller will update the matching menu item

 * entries found in application menus or context menus.

 */

/**

 * Returns a controller object that can be used for editor-specific commands:

 * - find

 * - find again

 * - go to line

 * - undo

 * - redo

 * - delete

 * - select all

 */

function createController(ed) {

  return {

    supportsCommand: function (cmd) {

      switch (cmd) {

        case "cmd_find":

        case "cmd_findAgain":

        case "cmd_gotoLine":

        case "cmd_undo":

        case "cmd_redo":

        case "cmd_delete":

        case "cmd_selectAll":

          return true;

      }

      return false;

    },

    isCommandEnabled: function (cmd) {

      let cm = ed.codeMirror;

      switch (cmd) {

        case "cmd_find":

        case "cmd_gotoLine":

        case "cmd_selectAll":

          return true;

        case "cmd_findAgain":

          return cm.state.search != null && cm.state.search.query != null;

        case "cmd_undo":

          return ed.canUndo();

        case "cmd_redo":

          return ed.canRedo();

        case "cmd_delete":

          return ed.somethingSelected();

      }

      return false;

    },

    doCommand: function (cmd) {

      let cm = ed.codeMirror;

      let map = {

        "cmd_selectAll": "selectAll",

        "cmd_find": "find",

        "cmd_undo": "undo",

        "cmd_redo": "redo",

        "cmd_delete": "delCharAfter",

        "cmd_findAgain": "findNext"

      };

      if (map[cmd]) {

        cm.execCommand(map[cmd]);

        return;

      }

      if (cmd == "cmd_gotoLine") {

        ed.jumpToLine();

      }

    },

    onEvent: function () {}

  };

}

/**

 * Create and insert a commands controller for the provided SourceEditor instance.

 */

function insertCommandsController(sourceEditor) {

  let input = sourceEditor.codeMirror.getInputField();

  let controller = createController(sourceEditor);

  input.controllers.insertControllerAt(0, controller);

}

module.exports = { insertCommandsController };