# frozen_string_literal: true

# The IncludedResourceParams class is responsible for parsing a string containing
# a comma separated list of associated resources to include with a request. See
# http://jsonapi.org/format/#fetching-includes for additional details although
# this is not required knowledge for the task at hand.
#
# Our API requires specific inclusion of related resourses - that is we do NOT
# want to support wildcard inclusion (e.g. `foo.*`)
#
# The IncludedResourceParams class has three public methods making up its API.
#
# [included_resources]
#   returns an array of non-wildcard included elements.
# [has_included_resources?]
#   Returns true if our supplied param has included resources, false otherwise.
# [model_includes]
#   returns an array suitable to supply to ActiveRecord's `includes` method
#   (http://guides.rubyonrails.org/active_record_querying.html#eager-loading-multiple-associations)
#   The included_resources should be transformed as specified in the unit tests
#   included herein.
#
# All three public methods have unit tests written below that must pass. You are
# free to add additional classes/modules as necessary and/or private methods
# within the IncludedResourceParams class.
#
# Feel free to use the Ruby standard libraries available in your
# solution.
#
class IncludedResourceParams
  def initialize(include_param)
    @include_param = include_param
  end

  ##
  # Does our IncludedResourceParams instance actually have any valid included
  # resources after parsing?
  #
  # @return [Boolean] whether this instance has included resources
  def parse
    array = @include_param ? @include_param.split(',') : []
    array = array.reject do |element|
      element.include? '*'
    end
  end

  def has_included_resources?
    !parse.empty?
  end

  ##
  # Fetches the included resourcs as an Array containing only non-wildcard
  # resource specifiers.
  #
  # @example nil
  #   IncludedResourceParams.new(nil).included_resources => []
  #
  # @example "foo,foo.bar,baz.*"
  #   IncludedResourceParams.new("foo,bar,baz.*").included_resources => ["foo", "bar"]
  #
  # @return [Array] an Array of Strings parsed from the include param with
  # wildcard includes removed
  def included_resources
    parse
    # TODO: implement me
  end

  ##
  # Converts the resources to be included from their JSONAPI representation to
  # a structure compatible with ActiveRecord's `includes` methods. This can/should
  # be an Array in all cases. Does not do any verification that the resources
  # specified for inclusion are actual ActiveRecord classes.
  #
  # @example nil
  #   IncludedResourceParams.new(nil).model_includes => []
  #
  # @example "foo"
  #   IncludedResourceParams.new("foo").model_includes => [:foo]
  #
  # @see Following unit tests
  #
  # @return [Array] an Array of Symbols and/or Hashes compatible with ActiveRecord
  # `includes`
  def model_includes
    # TODO: implement me
    ret = included_resources.map do |element|
    if (element.include? '.')
     to_active_record element.split '.'
    else 
     element.to_sym
    end 
   end  
     
  end

  # rec function that convert  to nested object
  def to_active_record(elements );
     if elements.length == 1 
     return [elements[0].to_sym]
     end

    {elements[0].to_sym => to_active_record(elements[1..elements.length])}
   end
end