#   Copyright (c) 2010-2011, Diaspora Inc.  This file is
#   licensed under the Affero General Public License version 3 or later.  See
#   the COPYRIGHT file.

class Reshare < Post
  belongs_to :root, :class_name => 'Post', :foreign_key => :root_guid, :primary_key => :guid
  validate :root_must_be_public
  validates_presence_of :root, :on => :create
  validates_uniqueness_of :root_guid, :scope => :author_id
  delegate :author, to: :root, prefix: true

  xml_attr :root_diaspora_id
  xml_attr :root_guid

  before_validation do
    self.public = true
  end

  after_commit :on => :create do
    self.root.update_reshares_counter if self.root.present?
  end

  after_destroy do
    self.root.update_reshares_counter if self.root.present?
  end

  def root_diaspora_id
    root.try(:author).try(:diaspora_handle)
  end

  delegate :o_embed_cache, :open_graph_cache,
           :message, :nsfw,
           to: :absolute_root, allow_nil: true

  def raw_message
    absolute_root.try(:raw_message) || super
  end

  def mentioned_people
    absolute_root.try(:mentioned_people) || super
  end

  def photos
    absolute_root.try(:photos) || super
  end

  def post_location
    {
      address: absolute_root.try(:location).try(:address),
      lat:     absolute_root.try(:location).try(:lat),
      lng:     absolute_root.try(:location).try(:lng)
    }
  end

  def poll
    absolute_root.try(:poll) || super
  end

  def receive(recipient, sender)
    local_reshare = Reshare.where(:guid => self.guid).first
    if local_reshare && local_reshare.root.author_id == recipient.person.id
      return unless recipient.has_contact_for?(sender)
    end
    super(recipient, sender)
  end

  def comment_email_subject
    I18n.t('reshares.comment_email_subject', :resharer => author.name, :author => root.author_name)
  end

  def notification_type(user, person)
    Notifications::Reshared if root.try(:author) == user.person
  end

  def absolute_root
    @absolute_root ||= self
    @absolute_root = @absolute_root.root while @absolute_root.is_a? Reshare
    @absolute_root
  end

  private

  def after_parse
    if root.blank?
      self.root = Diaspora::Fetcher::Single.find_or_fetch_from_remote root_guid, @root_diaspora_id do |fetched_post, author|
        # why do we check this?
        if fetched_post.diaspora_handle != author.diaspora_handle
          raise Diaspora::PostNotFetchable, "Diaspora ID (#{fetched_post.diaspora_handle}) in the root does not match the Diaspora ID (#{author.diaspora_handle}) specified in the reshare!"
        end
      end
    end
  end

  def root_must_be_public
    if self.root && !self.root.public
      errors[:base] << "Only posts which are public may be reshared."
      return false
    end
  end
end