class AdminData::BaseController < ApplicationController

  unloadable

  helper_method :admin_data_is_allowed_to_update?

  layout 'admin_data'

  include AdminData::Chelper

  before_filter :build_klasses, :build_drop_down_for_klasses, :check_page_parameter, :prepare_drop_down_klasses

  attr_reader :klass, :model

  private

  def prepare_drop_down_klasses
    k = params[:klass] || ''
    @drop_down_url = "http://#{request.host_with_port}/admin_data/quick_search/#{CGI.escape(k)}"
  end

  def ensure_is_allowed_to_view
    render :text => '<h2>not authorized</h2>' unless admin_data_is_allowed_to_view?
  end

  def ensure_is_allowed_to_view_klass
    render :text => 'not authorized' unless admin_data_is_allowed_to_view_klass?
  end

  def ensure_is_allowed_to_update
    render :text => 'not authorized' unless admin_data_is_allowed_to_update?
  end

  def ensure_is_allowed_to_update_klass
    render :text => 'not authorized' unless admin_data_is_allowed_to_update_klass?
  end


  def get_class_from_params
    begin
      @klass = AdminData::Util.camelize_constantize(params[:klass])
    rescue TypeError => e # in case no params[:klass] is supplied
      Rails.logger.debug 'no params[:klass] was supplied'
      redirect_to admin_data_index_path
    rescue NameError # in case wrong params[:klass] is supplied
      Rails.logger.debug 'wrong params[:klass] was supplied'
      redirect_to admin_data_index_path
    end
  end

  def build_klasses
    # if is_allowed_to_view_klass option is passed then golbal constant can't be used since
    # list of klasses need to be built for each user. It will slow down the speed a bit since
    # every single the list needs to be built
    if AdminData::Config.setting[:is_allowed_to_view_klass]
      @klasses = _build_custom_klasses
    else
      @klasses = _build_all_klasses
    end
  end

  def _build_all_klasses
    if defined? $admin_data_all_klasses
      return $admin_data_all_klasses
    else
      model_dir = File.join(Rails.root, 'app', 'models')
      model_names = Dir.chdir(model_dir) { Dir["**/*.rb"] }
      klasses = get_klass_names(model_names)
      $admin_data_all_klasses = remove_klasses_without_table(klasses).sort_by {|r| r.name.underscore}
    end
  end

  def _build_custom_klasses
    _build_all_klasses.compact.select do |klass_local|
      @klass = klass_local
      admin_data_is_allowed_to_view_klass?
    end
  end

  def remove_klasses_without_table(klasses)
    klasses.select { |k| k.ancestors.include?(ActiveRecord::Base) && k.connection.table_exists?(k.table_name) }
  end

  def get_klass_names(model_names)
    model_names.inject([]) do |output, model_name|
      klass_name = model_name.sub(/\.rb$/,'').camelize
      begin
        output << AdminData::Util.constantize_klass(klass_name)
      rescue Exception => e
        Rails.logger.debug e.message
      end
      output
    end
  end

  def build_drop_down_for_klasses
    @drop_down_for_klasses = @klasses.inject([]) do |result, klass|
      result << [klass.name.underscore, admin_data_search_url(:klass => klass.name.underscore)]
    end
  end

  def check_page_parameter
    # Got hoptoad error because of url like
    # http://localhost:3000/admin_data/User/advance_search?page=http://201.134.249.164/intranet/on.txt?
    if params[:page].blank? || (params[:page] =~ /\A\d+\z/)
      # proceed
    else
      render :text => 'Invalid params[:page]', :status => :unprocessable_entity
    end
  end

end