/**
 *
 * Post Methods
 *
 */

Posts.methods = {};
/**
 * Insert a post in the database (note: optional post properties not listed here)
 * @param {Object} post - the post being inserted
 * @param {string} post.userId - the id of the user the post belongs to
 * @param {string} post.title - the post's title
 */
Posts.methods.new = function (post) {

  const currentUser = Meteor.users.findOne(post.userId);

  post = Telescope.callbacks.run("posts.new.sync", post, currentUser);

  post._id = Posts.insert(post);

  // note: query for post to get fresh document with collection-hooks effects applied
  Telescope.callbacks.runAsync("posts.new.async", Posts.findOne(post._id));

  return post;
};

/**
 * Edit a post in the database
 * @param {string} postId – the ID of the post being edited
 * @param {Object} modifier – the modifier object
 * @param {Object} post - the current post object
 */
Posts.methods.edit = function (postId, modifier, post) {

  if (typeof post === "undefined") {
    post = Posts.findOne(postId);
  }

  modifier = Telescope.callbacks.run("posts.edit.sync", modifier, post);

  Posts.update(postId, modifier);

  Telescope.callbacks.runAsync("posts.edit.async", Posts.findOne(postId), post);

  return Posts.findOne(postId);
};

// ------------------------------------------------------------------------------------------- //
// ----------------------------------------- Methods ----------------------------------------- //
// ------------------------------------------------------------------------------------------- //

var postViews = [];

Meteor.methods({

  /**
   * Meteor method for submitting a post from the client
   * @memberof Posts
   * @param {Object} post - the post being inserted
   */
  'posts.new': function(post){

    check(post, Posts.simpleSchema());

    // required properties:
    // title

    // optional properties
    // URL
    // body
    // categories
    // thumbnailUrl

    // NOTE: the current user and the post author user might be two different users!

    // TODO: find a way to bind `this` to do the following in a callback?

    post = Telescope.callbacks.run("posts.new.method", post, Meteor.user());

    if (Meteor.isServer) {
      post.userIP = this.connection.clientAddress;
      post.userAgent = this.connection.httpHeaders["user-agent"];
    }

    return Posts.methods.new(post);
  },

  /**
   * Meteor method for editing a post from the client
   * @memberof Posts
   * @param {Object} modifier - the update modifier
   * @param {Object} postId - the id of the post being updated
   */
  'posts.edit': function (postId, modifier) {

    // checking might be redundant because SimpleSchema already enforces the schema, but you never know
    check(modifier, Match.OneOf({$set: Posts.simpleSchema()}, {$unset: Object}, {$set: Posts.simpleSchema(), $unset: Object}));
    check(postId, String);

    var user = Meteor.user(),
        post = Posts.findOne(postId),
        schema = Posts.simpleSchema()._schema;

    // ------------------------------ Checks ------------------------------ //

    // check that user can edit document
    if (!user || !Users.can.edit(user, post)) {
      throw new Meteor.Error(601, __('sorry_you_cannot_edit_this_post'));
    }

    // go over each field and throw an error if it's not editable
    // loop over each operation ($set, $unset, etc.)
    _.each(modifier, function (operation) {
      // loop over each property being operated on
      _.keys(operation).forEach(function (fieldName) {

        var field = schema[fieldName];
        if (!Users.can.editField(user, field, post)) {
          throw new Meteor.Error("disallowed_property", __('disallowed_property_detected') + ": " + fieldName);
        }

      });
    });

    return Posts.methods.edit(postId, modifier, post);

  },

  'posts.approve': function(postId){

    check(postId, String);
    
    var post = Posts.findOne(postId);
    var now = new Date();

    if(Users.is.admin(Meteor.user())){

      var set = {status: Posts.config.STATUS_APPROVED};

      if (!post.postedAt) {
        set.postedAt = now;
      }
      
      Posts.update(post._id, {$set: set});

      Telescope.callbacks.runAsync("postApproveAsync", post);

    }else{
      Messages.flash('You need to be an admin to do that.', "error");
    }
  },

  'posts.reject': function(postId){

    check(postId, String);
    var post = Posts.findOne(postId);
    
    if(Users.is.admin(Meteor.user())){

      Posts.update(post._id, {$set: {status: Posts.config.STATUS_REJECTED}});

      Telescope.callbacks.runAsync("postRejectAsync", post);
    
    }else{
      Messages.flash('You need to be an admin to do that.', "error");
    }
  },

  'posts.increaseViews': function(postId, sessionId){

    check(postId, String);
    check(sessionId, Match.Any);

    

    // only let users increment a post's view counter once per session
    var view = {_id: postId, userId: this.userId, sessionId: sessionId};

    if(_.where(postViews, view).length === 0){
      postViews.push(view);
      Posts.update(postId, { $inc: { viewCount: 1 }});
    }
  },

  'posts.deleteById': function(postId) {

    check(postId, String);

    // remove post comments
    // if(!this.isSimulation) {
    //   Comments.remove({post: postId});
    // }
    // NOTE: actually, keep comments after all

    var post = Posts.findOne({_id: postId});

    if(!Meteor.userId() || !Users.can.editById(Meteor.userId(), post)) throw new Meteor.Error(606, 'You need permission to edit or delete a post');

    // decrement post count
    Users.update({_id: post.userId}, {$inc: {"telescope.postCount": -1}});

    // delete post
    Posts.remove(postId);

    Telescope.callbacks.runAsync("postDeleteAsync", post);

  },

  'posts.checkForDuplicates': function (url) {
    Posts.checkForSameUrl(url);  
  },

  'posts.upvote': function (postId) {
    check(postId, String);
    console.log("upvote")
    return Telescope.operateOnItem.call(this, Posts, postId, Meteor.user(), "upvote");
  },

  'posts.downvote': function (postId) {
    check(postId, String);
    return Telescope.operateOnItem.call(this, Posts, postId, Meteor.user(), "downvote");
  },

  'posts.cancelUpvote': function (postId) {
    check(postId, String);
    console.log("cancelUpvote")
    return Telescope.operateOnItem.call(this, Posts, postId, Meteor.user(), "cancelUpvote");
  },

  'posts.cancelDownvote': function (postId) {
    check(postId, String);
    return Telescope.operateOnItem.call(this, Posts, postId, Meteor.user(), "cancelDownvote");
  }

});