module PgSearch::Multisearchable

def self.included(mod)
  mod.class_eval do
    has_one :pg_search_document,
      :as => :searchable,
      :class_name => "PgSearch::Document",
      :dependent => :delete
    after_save :update_pg_search_document,
      :if => -> { PgSearch.multisearch_enabled? }
  end
end

def create_or_update_pg_search_document
  if !pg_search_document
    create_pg_search_document(pg_search_document_attrs)
  elsif should_update_pg_search_document?
    pg_search_document.update_attributes(pg_search_document_attrs)
  end
end

def pg_search_document_attrs
  {
    content: searchable_text
  }.tap do |h|
    if (attrs = pg_search_multisearchable_options[:additional_attributes])
      h.merge! attrs.to_proc.call(self)
    end
  end
end

def searchable_text
  Array(pg_search_multisearchable_options[:against])
    .map { |symbol| send(symbol) }
    .join(" ")
end

def should_update_pg_search_document?
  conditions = Array(pg_search_multisearchable_options[:update_if])
  conditions.all? { |condition| condition.to_proc.call(self) }
end

def update_pg_search_document # rubocop:disable Metrics/AbcSize
  if_conditions = Array(pg_search_multisearchable_options[:if])
  unless_conditions = Array(pg_search_multisearchable_options[:unless])
  should_have_document =
    if_conditions.all? { |condition| condition.to_proc.call(self) } &&
    unless_conditions.all? { |condition| !condition.to_proc.call(self) }
  if should_have_document
    create_or_update_pg_search_document
  else
    pg_search_document.destroy if pg_search_document
  end
end