# 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.

module GoodData
  module Mixin
    module MdObjectIndexer
      MD_OBJ_CTG = 'obj'

      # Returns either list of objects or a specific object.
      # This method is reimplemented in subclasses to leverage specific
      # implementation for specific type of objects. Options is used in
      # subclasses specifically to provide shorthand for getting a full
      # objects after getting a list of hashes from query resource.
      # @param [Object] id id can be either a number a String (as a URI). Subclasses should also be abel to deal with getting the instance of MdObject already and a :all symbol
      # @param [Hash] options 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 [MdObject] if id is a String or number single object is returned
      # @return [Array] if :all was provided as an id, list of objects should
      # be returned. Note that this is implemented only in the subclasses.
      # MdObject does not support this since API has no means to return list
      # of all types of objects.
      def [](id, options = { :client => GoodData.connection, :project => GoodData.project })
        client, project = GoodData.get_client_and_project(options)

        fail "You have to provide an \"id\" to be searched for." unless id
        fail(NoProjectError, 'Connect to a project before searching for an object') unless project
        return all(options) if id == :all
        return id if id.is_a?(MdObject)
        uri = if id.is_a?(Integer) || id =~ /^\d+$/
                "#{project.md[MD_OBJ_CTG]}/#{id}"
              elsif id !~ %r{/}
                identifier_to_uri options, id
              elsif id =~ %r{^/}
                id
              else
                fail 'Unexpected object id format: expected numeric ID, identifier with no slashes or an URI starting with a slash'
              end
        # new(GoodData.get uri) unless uri.nil?
        if uri # rubocop:disable Style/GuardClause
          raw = client.get(uri)
          md_class = self
          case raw.keys.first
          when 'attribute'
            md_class = GoodData::Attribute
          when 'metric'
            md_class = GoodData::Metric
          when 'projectDashboard'
            md_class = GoodData::Dashboard
          when 'report'
            md_class = GoodData::Report
          when 'attributeDisplayForm'
            md_class = GoodData::Label
          when 'reportDefinition'
            md_class = GoodData::ReportDefinition
          when 'dataSet'
            md_class = GoodData::Dataset
          else
            md_class = self
          end

          client.create(md_class, raw, client: client, project: project)
        end
      end

      alias_method :get_by_id, :[]
    end
  end
end