module Algolia::Ingestion::AuthInput

def build(data)
  # Go through the list of oneOf items and attempt to identify the appropriate one.
  # Note:
  # - We do not attempt to check whether exactly one item matches.
  # - No advanced validation of types in some cases (e.g. "x: { type: string }" will happily match { x: 123 })
  #   due to the way the deserialization is made in the base_object template (it just casts without verifying).
  # - TODO: scalar values are de facto behaving as if they were nullable.
  # - TODO: logging when debugging is set.
  openapi_one_of.each do |klass|
    next if klass == :AnyType # "nullable: true"
    typed_data = find_and_cast_into_type(klass, data)
    return typed_data if typed_data
  rescue # rescue all errors so we keep iterating even if the current item lookup raises
  end
  openapi_one_of.include?(:AnyType) ? data : nil
end

def find_and_cast_into_type(klass, data)
  return if data.nil?
  case klass.to_s
  when 'Boolean'
    return data if data.instance_of?(TrueClass) || data.instance_of?(FalseClass)
  when 'Float'
    return data if data.instance_of?(Float)
  when 'Integer'
    return data if data.instance_of?(Integer)
  when 'Time'
    return Time.parse(data)
  when 'Date'
    return Date.parse(data)
  when 'String'
    return data if data.instance_of?(String)
  when 'Object' # "type: object"
    return data if data.instance_of?(Hash)
  when /\AArray<(?<sub_type>.+)>\z/ # "type: array"
    if data.instance_of?(Array)
      sub_type = Regexp.last_match[:sub_type]
      return data.map { |item| find_and_cast_into_type(sub_type, item) }
    end
  when /\AHash<String, (?<sub_type>.+)>\z/ # "type: object" with "additionalProperties: { ... }"
    if data.instance_of?(Hash) && data.keys.all? { |k| k.instance_of?(Symbol) || k.instance_of?(String) }
      sub_type = Regexp.last_match[:sub_type]
      return data.each_with_object({}) { |(k, v), hsh| hsh[k] = find_and_cast_into_type(sub_type, v) }
    end
  else # model
    const = Algolia::Ingestion.const_get(klass)
    if const
      if const.respond_to?(:openapi_one_of) # nested oneOf model
        model = const.build(data)
      else
        # raise if data contains keys that are not known to the model
        raise unless (data.keys - const.acceptable_attributes).empty?
        model = const.build_from_hash(data)
      end
      return model if model
    end
  end
  raise # if no match by now, raise
rescue
  raise SchemaMismatchError, "#{data} doesn't match the #{klass} type"
end

def openapi_one_of
  [
    :AuthAPIKey,
    :AuthAlgolia,
    :AuthAlgoliaInsights,
    :AuthBasic,
    :AuthGoogleServiceAccount,
    :AuthOAuth
  ]
end