# encoding: UTF-8
#
# Copyright (c) 2010-2017 GoodData Corporation. All rights reserved.
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.

require_relative '../metadata'
require_relative '../../core/rest'
require_relative '../../mixins/is_fact'

require_relative 'metadata'

module GoodData
  class Fact < GoodData::MdObject
    include Mixin::IsFact

    # TODO: verify that we have all (which we do not right now)
    FACT_BASE_AGGREGATIONS = [:sum, :min, :max, :avg, :median, :runsum, :runmin, :runmax, :runavg, :runstdev, :runstdevp, :runvar, :runvarp, :stdev, :stdevp, :var, :varp]

    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('fact', Fact, options)
      end
    end

    # Creates the basic count metric with the fact used. The metric created is not saved.
    # @param [Hash] options the options to pass to the value list
    # @option options [Symbol] :type type of aggregation function. Default is :sum
    # @return [GoodData::Metric]
    def create_metric(options = { :type => :sum })
      a_type = options[:type] || :sum
      unless FACT_BASE_AGGREGATIONS.include?(a_type)
        fail "Suggested aggreagtion function (#{a_type}) does not exist for " /
             'base metric created out of fact. You can use only one of ' /
             "#{FACT_BASE_AGGREGATIONS.map { |x| ':' + x.to_s }.join(',')}"
      end
      a_title = options[:title] || "#{a_type} of #{title}"
      project.create_metric("SELECT #{a_type.to_s.upcase}([#{uri}])", title: a_title, extended_notation: false)
    end

    alias_method :create_measure, :create_metric
  end
end