# MIT License
#
# Copyright (c) 2018, Dane Avilla
#
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# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
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# SOFTWARE.

module GraphqlGrpc
  module Arrayify
    #
    # Translate from gRPC hashmaps w/ integer keys to arrays of objects with
    # 'key' and 'value' fields.
    #
    # Recursively descend through the hash; if any hashes are encountered where
    # all the keys are integers, convert that hash into an array of hashes with
    # [{ key: <integer_value>, value: <the_value> },
    #  { key: <integer_value>, value: <the_value> },...]
    #
    # Example: {1: :hello, 2: :world} => [{key:1, value: :hello}, {key:2, value: :world}]
    #
    def arrayify_hashes(input)
      case input.class.name.to_sym
      when :Array
        input.map { |i| arrayify_hashes(i) }
      when :Hash
        if input.keys.map(&:class).compact.sort.uniq == [Fixnum]
          arr = input.to_a.map { |e| { key: e.first, value: e.last } }
          result = arrayify_hashes(arr)
        else
          input.each { |k,v| input[k] = arrayify_hashes(v) }
        end
      else
        input
      end
    end
  end
end