module Elabs
  class ElabsApplicationController < ActionController::Base
    include Elabs::Concerns::Reportable
    include Elabs::Concerns::Localizable

    ALLOWED_NESTED_FROM = [].freeze
    ALLOWED_ORDER_FROM  = [].freeze
    DEFAULT_ORDER       = { id: :desc }.freeze
    IS_NSFW_FILTERABLE  = false
    MAX_ITEMS_PER_PAGE  = Elabs.max_items_per_page

    before_action :set_nsfw_option
    protect_from_forgery with: :exception

    layout 'elabs/layouts/application'

    private

    def scope_request(orm_request)
      orm_request = build_request_nested orm_request
      orm_request = build_request_where orm_request
      orm_request = build_request_nsfw orm_request if self.class::IS_NSFW_FILTERABLE

      build_request_order orm_request
    end

    def build_request_nested(orm_request)
      where_clauses = {}

      params.each do |p|
        # No need to do this with "album_id" as there is no action requiring it (as for a /albums/xxx/uploads)
        next unless %w[tag_id project_id].include? p[0]
        foreign_table                = p[0].chomp('_id').pluralize.to_sym
        orm_request                  = orm_request.joins(foreign_table)
        where_clauses[foreign_table] = { id: p[1] }
        next
      end

      orm_request.where(where_clauses)
    end

    def build_request_where(orm_request)
      allowed_scopes_ids = self.class::ALLOWED_NESTED_FROM.map { |n| "#{n}_id" }
      clean_list = allowed_scopes_ids.reject { |s| %w[tag_id project_id].include? s }

      params.each do |p|
        orm_request = orm_request.where(p[0] => p[1]) if clean_list.include? p[0]
      end

      orm_request
    end

    def build_request_order(orm_request)
      allowed_order_fields = self.class::ALLOWED_ORDER_FROM.map { |n| "order_by_#{n}" }
      orders               = 0

      params.each do |p|
        next unless allowed_order_fields.include? p[0]
        field       = p[0].gsub(/^order_by_/, '')
        orm_request = orm_request.order "#{field}_id" => p[1]
        orders += 1
      end

      orm_request = orm_request.order(self.class::DEFAULT_ORDER) if orders.zero?

      orm_request
    end

    def build_request_nsfw(orm_request)
      if params['sfw_status']
        return case params['sfw_status']
               when 'sfw_only'
                 orm_request.where(sfw: true)
               when 'nsfw_only'
                 orm_request.where(sfw: false)
               else
                 orm_request
               end
      end
      orm_request
    end

    def set_nsfw_option
      session[:show_nsfw] ||= false
      session[:show_nsfw] = params['show_nsfw'] == 'true' if params['show_nsfw']
    end

    # Wrapper method for `instance_variable_set` that adds the `@` character to the variable name.
    #
    # @return [void]
    def create_instance_variable(variable, entity = @entity)
      instance_variable_set "@#{variable}", entity
    end
  end
end