// The Antville Project
// http://code.google.com/p/antville
//
// Copyright 2001–2014 by the Workers of Antville.
//
// 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.

/**
 * @fileOverview Methods that implement Blogger's XML-RPC API.
 * See http://goo.gl/u8lZZ for further details.
 * The blogger.getTemplate and blogger.setTemplate methods are not supported
 */

/** @namespace */
Api.blogger = {};

/**
 *
 * @param {String} content
 */
Api.blogger._getContentParts = function(content) {
  content && (content = content.trim());
  content || (content = String.EMPTY);
  var result = {};
  if (!content.startsWith('<title>')) {
    result.text = content;
  } else {
    var pos = content.lastIndexOf('</title>');
    if (pos > 0) {
      result.title = content.substring(7, pos);
      result.text = content.substring (pos + 8);
    } else {
      result.text = content;
    }
  }
  return result;
}

/**
 *
 * @param {String} appKey
 * @param {String} name
 * @param {String} password
 * @throws {Error}
 * @returns {Object} Properties: userid, nickname and url
 */
Api.blogger.getUserInfo = function(appKey, name, password) {
  var user = User.getByName(name);
  if (!user) {
    throw Error('User ' + name + ' does not exist on this server');
  }
  return {
    userid: name,
    nickname: name,
    url: user.url
  }
}

/**
 *
 * @param {String} appKey
 * @param {String} name
 * @param {String} password
 * @returns {Object[]} A list of objects with the properties blogid, blogName and
 * url
 */
Api.blogger.getUsersBlogs = function(appKey, name, password) {
  var user = Api.getUser(name, password);
  var result = [];
  user.forEach(function() {
    Api.constrain(this.site, user);
    if (this.site.stories.getPermission('create')) {
      result.push({
        blogid: this.site.name,
        blogName: this.site.title,
        url: this.site.href()
      });
    }
    return;
  });
  return result;
}

/**
 *
 * @param {String} appKey
 * @param {Number} id
 * @param {String} name
 * @param {String} password
 * @param {Number} limit
 * @throws {Error}
 * @returns {Object[]} A list of objects with the properties postid, userid,
 * dateCreated and content
 */
Api.blogger.getRecentPosts = function(appKey, id, name, password, limit) {
  var site = Api.getSite(id);
  var user = Api.getUser(name, password);

  Api.constrain(site, user);
  if (!site.stories.getPermission('main')) {
    throw Error('Permission denied for user ' + user.name +
        ' to get recent posts of site ' + site.name);
  }

  var result = [];
  var stories = res.handlers.membership.stories;
  var max = Math.min(stories.size(), Number(limit) || Infinity, 20);
  for each (var story in stories.list(0, max)) {
    result.push({
      postid: story._id,
      userid: story.creator.name,
      dateCreated: story.created,
      content: story.title ? '<title>' + story.title +
          '</title>' + story.text : story.text
    });
  }
  return result;
}

/**
 *
 * @param {String} appKey
 * @param {Number} id
 * @param {String} name
 * @param {String} password
 * @throws {Error}
 * @returns {Object} Properties: content, userid, postid, dateCreated
 */
Api.blogger.getPost = function(appKey, id, name, password) {
  var story = Api.getStory(id);
  var user = Api.getUser(name, password);

  Api.constrain(story.site, user);
  if (!story.getPermission('main')) {
    throw Error('Permission denied for user ' + name +
        ' to get post #' + id);
  }

  return {
    content: story.title ? html.elementAsString('title', story.title) +
        story.text : story.text,
    userid: story.creator.name,
    postid: story._id,
    dateCreated: story.created
  }
}

/**
 *
 * @param {String} appKey
 * @param {Number} id
 * @param {String} name
 * @param {String} password
 * @param {String} content
 * @param {Boolean} publish
 * @throws {Error}
 * @returns {Number} The ID of the new story
 */
Api.blogger.newPost = function(appKey, id, name, password, content, publish) {
  var site = Api.getSite(id);
  var user = Api.getUser(name, password);

  Api.constrain(site, user);
  if (!site.stories.getPermission('create')) {
    throw Error('Permission denied for user ' + user.name +
        ' to add a post to site ' + site.name);
  }

  var parts = Api.blogger._getContentParts(content);

  var story = Story.add({
    title: parts.title,
    text: parts.text,
    status: publish ? Story.PUBLIC : Story.CLOSED,
    mode: Story.FEATURED
  }, site, user);

  return story._id;
}

/**
 *
 * @param {String} appKey
 * @param {Number} id
 * @param {String} name
 * @param {String} password
 * @param {String} content
 * @param {Boolean} publish
 * @throws {Error}
 * @returns {Boolean} Always true
 */
Api.blogger.editPost = function(appkey, id, name, password, content, publish) {
  var story = Api.getStory(id);
  var user = Api.getUser(name, password);

  Api.constrain(story.site, user);
  if (!story.getPermission('edit')) {
    throw Error('Permission denied for user ' + name +
        ' to edit post #' + id);
  }

  var parts = Api.blogger._getContentParts(content);
  story.update({
    title: parts.title,
    text: parts.text,
    status: publish ? Story.PUBLIC : Story.CLOSED,
    modifier: user,
    modified: new Date
  });
  return true;
}

/**
 *
 * @param {String} appKey
 * @param {Number} id
 * @param {String} name
 * @param {String} password
 * @throws {Error}
 * @returns {Boolean} Always true
 */
Api.blogger.deletePost = function(appKey, id, name, password) {
  var story = Api.getStory(id);
  var user = Api.getUser(name, password);

  Api.constrain(story.site, user);
  if (!story.getPermission('delete')) {
    throw Error('Permission denied for user ' + name +
        ' to delete story #' + id);
  }

  Story.remove.call(story);
  return true;
}