# frozen_string_literal: true

module GirFFI
  module Builders
    # Builder that generates code to convert values from Ruby to C. Used by
    # argument builders.
    class RubyToCConvertor
      def initialize(type_info, argument_name, ownership_transfer: nil)
        @type_info = type_info
        @argument_name = argument_name
        @ownership_transfer = ownership_transfer
      end

      def conversion
        args = conversion_arguments @argument_name
        "#{@type_info.argument_class_name}.#{conversion_method}(#{args})"
      end

      def conversion_arguments(name)
        @type_info.extra_conversion_arguments.map(&:inspect).push(name).join(", ")
      end

      private

      def conversion_method
        case @type_info.flattened_tag
        when :utf8
          "from_utf8"
        when :struct, :c
          case @ownership_transfer
          when :everything
            "copy_from"
          else
            "from"
          end
        when :enum
          "to_int"
        else
          "from"
        end
      end
    end
  end
end