/**
 * Copyright 2013 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @providesModule DOMChildrenOperations
 * @typechecks static-only
 */

"use strict";

var Danger = require('Danger');
var ReactMultiChildUpdateTypes = require('ReactMultiChildUpdateTypes');

var getTextContentAccessor = require('getTextContentAccessor');

/**
 * The DOM property to use when setting text content.
 *
 * @type {string}
 * @private
 */
var textContentAccessor = getTextContentAccessor() || 'NA';

/**
 * Inserts `childNode` as a child of `parentNode` at the `index`.
 *
 * @param {DOMElement} parentNode Parent node in which to insert.
 * @param {DOMElement} childNode Child node to insert.
 * @param {number} index Index at which to insert the child.
 * @internal
 */
function insertChildAt(parentNode, childNode, index) {
  var childNodes = parentNode.childNodes;
  if (childNodes[index] === childNode) {
    return;
  }
  // If `childNode` is already a child of `parentNode`, remove it so that
  // computing `childNodes[index]` takes into account the removal.
  if (childNode.parentNode === parentNode) {
    parentNode.removeChild(childNode);
  }
  if (index >= childNodes.length) {
    parentNode.appendChild(childNode);
  } else {
    parentNode.insertBefore(childNode, childNodes[index]);
  }
}

/**
 * Operations for updating with DOM children.
 */
var DOMChildrenOperations = {

  dangerouslyReplaceNodeWithMarkup: Danger.dangerouslyReplaceNodeWithMarkup,

  /**
   * Updates a component's children by processing a series of updates. The
   * update configurations are each expected to have a `parentNode` property.
   *
   * @param {array<object>} updates List of update configurations.
   * @param {array<string>} markupList List of markup strings.
   * @internal
   */
  processUpdates: function(updates, markupList) {
    var update;
    // Mapping from parent IDs to initial child orderings.
    var initialChildren = null;
    // List of children that will be moved or removed.
    var updatedChildren = null;

    for (var i = 0; update = updates[i]; i++) {
      if (update.type === ReactMultiChildUpdateTypes.MOVE_EXISTING ||
          update.type === ReactMultiChildUpdateTypes.REMOVE_NODE) {
        var updatedIndex = update.fromIndex;
        var updatedChild = update.parentNode.childNodes[updatedIndex];
        var parentID = update.parentID;

        initialChildren = initialChildren || {};
        initialChildren[parentID] = initialChildren[parentID] || [];
        initialChildren[parentID][updatedIndex] = updatedChild;

        updatedChildren = updatedChildren || [];
        updatedChildren.push(updatedChild);
      }
    }

    var renderedMarkup = Danger.dangerouslyRenderMarkup(markupList);

    // Remove updated children first so that `toIndex` is consistent.
    if (updatedChildren) {
      for (var j = 0; j < updatedChildren.length; j++) {
        updatedChildren[j].parentNode.removeChild(updatedChildren[j]);
      }
    }

    for (var k = 0; update = updates[k]; k++) {
      switch (update.type) {
        case ReactMultiChildUpdateTypes.INSERT_MARKUP:
          insertChildAt(
            update.parentNode,
            renderedMarkup[update.markupIndex],
            update.toIndex
          );
          break;
        case ReactMultiChildUpdateTypes.MOVE_EXISTING:
          insertChildAt(
            update.parentNode,
            initialChildren[update.parentID][update.fromIndex],
            update.toIndex
          );
          break;
        case ReactMultiChildUpdateTypes.TEXT_CONTENT:
          update.parentNode[textContentAccessor] = update.textContent;
          break;
        case ReactMultiChildUpdateTypes.REMOVE_NODE:
          // Already removed by the for-loop above.
          break;
      }
    }
  }

};

module.exports = DOMChildrenOperations;
