module SimpleForm::Components::MinMax

def evaluate_numericality_validator_option(option)
  if option.is_a?(Numeric)
    option
  elsif option.is_a?(Symbol)
    object.send(option)
  elsif option.respond_to?(:call)
    option.call(object)
  end
end

def find_numericality_validator
  find_validator(:numericality)
end

def integer?
  input_type == :integer
end

def maximum_value(validator_options)
  if integer? && validator_options.key?(:less_than)
    evaluate_numericality_validator_option(validator_options[:less_than]) - 1
  else
    evaluate_numericality_validator_option(validator_options[:less_than_or_equal_to])
  end
end

def min_max(wrapper_options = nil)
  if numeric_validator = find_numericality_validator
    validator_options = numeric_validator.options
    input_html_options[:min] ||= minimum_value(validator_options)
    input_html_options[:max] ||= maximum_value(validator_options)
  end
  nil
end

def minimum_value(validator_options)
  if integer? && validator_options.key?(:greater_than)
    evaluate_numericality_validator_option(validator_options[:greater_than]) + 1
  else
    evaluate_numericality_validator_option(validator_options[:greater_than_or_equal_to])
  end
end