module SearchableModel
  extend ActiveSupport::Concern

  included do

    # Helper function for relations that
    # adds OR ILIKE where clause for all specified attributes
    # for the given search query
    scope :where_attributes_like, ->(attributes, query) do
      attrs = []
      if attributes.blank? or query.blank?
        # Do nothing in this case
      elsif attributes.is_a? Symbol
        attrs = [attributes.to_s]
      elsif attributes.is_a? String
        attrs = [attributes]
      elsif attributes.is_a? Array
        attrs = attributes.collect { |a| a.to_s }
      else
        raise ArgumentError, ":attributes must be an array, symbol or string"
      end

      if query.is_a? Array

        rich_text_regex = '<*strong>|<*href>|<*div>|' \
        '<*link>|<*span>|<%class%>|<%href%>|' \
        '<%data%>|<*sub>|<*sup>|<*blockquote>|<*li>|' \
        '<%style%>|<*ol>|<*ul>|<*pre>'

        if attrs.length > 0
          where_str =
            (attrs.map.with_index do |a, i|
              "REGEXP_REPLACE(#{a}, E'#{rich_text_regex}','', 'g')" \
              "ILIKE ANY (array[ :t#{i}]) OR "
            end
            ).join[0..-5]
          vals = (attrs.map.with_index do |a, i|
                    ["t#{i}".to_sym, query]
                  end
                 ).to_h

          return where(where_str, vals)
        end
      else
        if attrs.length > 0
          where_str =
            (attrs.map.with_index do |a, i|
              "REGEXP_REPLACE(#{a}, E'#{rich_text_regex}'," \
              " '', 'g' ) ILIKE :t#{i} OR "
            end
            ).join[0..-5]
          vals = (attrs.map.with_index { |a,i| [ "t#{i}".to_sym, "%#{query}%" ] }).to_h

          return where(where_str, vals)
        end
      end
    end
  end
end