# frozen_string_literal: true

require "gir_ffi/builders/argument_builder_collection"
require "gir_ffi/builders/method_template"
require "gir_ffi/builders/null_return_value_builder"

module GirFFI
  module Builders
    # Implements the creation of a Ruby constructor definition out of a
    # GIR IFunctionInfo.
    # TODO: Derive from BaseMethodBuilder
    class ConstructorBuilder
      def initialize(info)
        @info = info
        return_value_builder = NullReturnValueBuilder.new
        arg_builders = ArgumentBuilderCollection.new(return_value_builder, [])
        @template = MethodTemplate.new(self, arg_builders)
      end

      def method_definition
        @template.method_definition
      end

      def singleton_method?
        true
      end

      def method_name
        @info.safe_name
      end

      def method_arguments
        ["*args", "&block"]
      end

      def preparation
        if @info.safe_name == "new"
          ["obj = allocate"]
        else
          [
            "raise NoMethodError unless self == #{@info.container.full_name}",
            "obj = allocate"
          ]
        end
      end

      def invocation
        "obj.__send__ #{initializer_name.to_sym.inspect}, #{method_arguments.join(", ")}"
      end

      def result
        ["obj"]
      end

      private

      def initializer_name
        @info.safe_name.sub(/^new/, "initialize")
      end
    end
  end
end
