# Concern for sorting models
module Sortable
  extend ActiveSupport::Concern

  included do
    before_action :sort
  end

  private

  def sort
    return if params['searching'].nil?

    @search_hash = Array.new
    objects      = Array.new

    params.each do |k, v|
      unless v.class.eql? String
        objects << k
        @search_hash << v
      end
    end

    puts objects.inspect

    return if objects.nil? || objects.empty?

    # If the object is inside a namespace
    if objects[0].include? '::'
      to_capitalize = objects[0].split('::')
      # We split the string with '::' and camelize the two words
      # Then we have to join again with '::' the capitalized words
      results = (to_capitalize.map { |o| o.camelize.singularize }).join('::').constantize.unscoped
    else
      results = objects[0].camelize.constantize.unscoped
    end

    @search_hash.each_with_index do |object_params, index|
      table_name = objects[index].pluralize
      table_name = params[:table_name] if params[:table_name]

      object_params.each do |k, v|
        next unless v.present?

        if v.eql? 'null'
          if index != 0
            results = results.joins(table_name.to_sym).where("#{table_name}.#{k} is null")
          else
            results = results.where("#{table_name}.#{k} is null")
          end
        elsif !v.nil?
          if index != 0
            if k.eql?('created_at') || k.eql?('updated_at')
              results = results.where("created_at::date = to_date(?, 'YYYY/MM/DD')", v)
            else
              results = results.joins(table_name.to_sym).where("#{table_name}.#{k}::varchar ILIKE '%#{v}%'")
            end
          else
            results = results.where("#{table_name}.#{k}::varchar ILIKE ?", "%#{v}%")
          end
        end
      end

    end

    objects_per_page = (params.select { |k, v| k.match /per_page$/ }).values.first
    objects_per_page ||= 20
    @result = results.distinct.paginate(page: params[:page], per_page: objects_per_page).order(sort_options)
  end

  private

  def sort_options
    "#{sort_column} #{sort_direction}"
  end

  def sort_column
    params[:sort] ? params[:sort] : 'updated_at'
  end

  def sort_direction
    %w[asc desc].include?(params[:direction]) ? params[:direction] : 'asc'
  end
end