assemblymade/coderwall

# == Schema Information
#
# Table name: comments
#
#  id                 :integer          not null, primary key
#  title              :string(50)       default("")
#  comment            :text             default("")
#  protip_id          :integer
#  user_id            :integer
#  likes_cache        :integer          default(0)
#  likes_value_cache  :integer          default(0)
#  created_at         :datetime
#  updated_at         :datetime
#  likes_count        :integer          default(0)
#  user_name          :string(255)
#  user_email         :string(255)
#  user_agent         :string(255)
#  user_ip            :inet
#  request_format     :string(255)
#  spam_reports_count :integer          default(0)
#  state              :string(255)      default("active")
#

class Comment < ActiveRecord::Base
  include AuthorDetails
  include SpamFilter

  belongs_to :protip, touch: true
  has_many :likes, as: :likable, dependent: :destroy
  after_create :generate_event
  after_save :commented_callback

  default_scope { order('likes_cache DESC').order(:created_at) }

  belongs_to :user, autosave: true

  scope :showable, -> { with_states(:active, :reported_as_spam) }

  alias_method :author, :user
  alias_attribute :body, :comment

  validates :comment, length: { minimum: 2 }

  state_machine initial: :active do
    event :report_spam do
      transition active: :reported_as_spam
    end

    event :mark_as_spam do
      transition any => :marked_as_spam
    end

    after_transition any => :marked_as_spam do |comment|
      comment.spam!
    end
  end

  def commented_callback
    protip.commented
  end

  def like_by(user)
    unless self.liked_by?(user) or user.id == self.author_id
      self.likes.create!(user: user, value: user.score)
      generate_event(liker: user.username)
    end
  end

  def liked(how_much=nil)
    commented_callback unless how_much.nil?
  end

  def liked_by?(user)
    likes.where(user_id: user.id).any?
  end

  def authored_by?(user)
    author.id == user.id
  end

  def author_id
    user_id
  end

  def mentions
    User.where(username: username_mentions)
  end

  def username_mentions
    self.body.scan(/@([a-z0-9_]+)/).flatten
  end

  def mentioned?(username)
    username_mentions.include? username
  end

  def to_protip_public_hash
    protip.to_public_hash.merge(
      {
        comments: protip.comments.count,
        likes:    likes.count,
      }
    )
  end

  def commenting_on_own?
    user_id == protip.user_id
  end

  private

  def generate_event(options={})
    event_type = event_type(options)
    data       = to_event_hash(options)
    GenerateEventJob.perform_async(event_type, event_audience(event_type), data, 1.minute)

    if event_type == :new_comment
      NotifierMailer.new_comment(protip.user_id, user_id, id).deliver unless commenting_on_own?

      if (mentioned_users = self.mentions).any?
        GenerateEventJob.perform_async(:comment_reply, Audience.users(mentioned_users.pluck(:id)), data, 1.minute)

        mentioned_users.each do |mention|
          NotifierMailer.comment_reply(mention.username, self.author.username, self.id).deliver
        end
      end
    end
  end

  def to_event_hash(options={})
    event_hash              = to_protip_public_hash.merge!({ user: { username: user && user.username }, body: {} })
    event_hash[:created_at] = event_hash[:created_at].to_i

    unless options[:liker].nil?
      event_hash[:user][:username] = options[:liker]
      event_hash[:liker]           = options[:liker]
    end
    event_hash
  end

  def event_audience(event_type, options ={})
    case event_type
    when :new_comment
      audience = Audience.user(protip.user_id)
    else
      audience = Audience.user(author_id)
    end
    audience
  end

  def event_type(options={})
    if options[:liker]
      :comment_like
    else
      :new_comment
    end
  end
end