# encoding: UTF-8

require_relative '../metadata'

require_relative 'metadata'

module GoodData
  class Variable < MdObject
    root_key :prompt

    class << self
      # Method intended to get all objects of that type in a specified project
      #
      # @param options [Hash] the options hash
      # @option options [Boolean] :full if passed true the subclass can decide to pull in full objects. This is desirable from the usability POV but unfortunately has negative impact on performance so it is not the default
      # @return [Array<GoodData::MdObject> | Array<Hash>] Return the appropriate metadata objects or their representation
      def all(options = { :client => GoodData.connection, :project => GoodData.project })
        query('prompt', Variable, options)
      end

      def create(data, options = { :client => GoodData.connection, :project => GoodData.project })
        title = data[:title]
        project = options[:project]
        c = client(options)
        attribute = project.attributes(data[:attribute])

        payload = {
          'prompt' => {
            'content' => {
              'attribute' => attribute.uri,
              'type' => 'filter'
            },
            'meta' => {
              'tags' => '',
              'deprecated' => '0',
              'summary' => '',
              'title' => title,
              'category' => 'prompt'
            }
          }
        }
        c.create(self, payload, project: project)
      end
    end

    # Retrieves variable values
    #
    # @return [Array<GoodData::VariableUserFilter>] Values of variable
    def values
      payload = {
        variablesSearch: {
          variables: [
            uri
          ],
          context: []
        }
      }
      client.post("/gdc/md/#{project.pid}/variables/search", payload)['variables'].map { |f| client.create(GoodData::VariableUserFilter, f, project: project) }
    end

    # Retrieves variable values and returns only those related to user
    #
    # @return [Array<GoodData::VariableUserFilter>] Values of variable related to user
    def user_values
      values.select { |x| x.level == :user }
    end

    # Retrieves variable values and returns only those related to project
    #
    # @return [Array<GoodData::VariableUserFilter>] Values of variable related to project
    def project_values
      values.select { |x| x.level == :project }
    end

    # Deletes all the values and eventually the variable itself
    def delete
      values.pmap(&:delete)
      super
    end
  end
end