# frozen_string_literal: true

require "rake"
require "syntax_tree/rake_tasks"

module Migrations::Database::Schema
  class EnumWriter
    def initialize(namespace, header)
      @namespace = namespace
      @header = header.gsub(/^/, "# ")
    end

    def self.filename_for(enum)
      "#{enum.name.downcase.underscore}.rb"
    end

    def output_enum(enum, output_stream)
      module_name = ::Migrations::Database::Schema.to_singular_classname(enum.name)

      output_stream.puts "# frozen_string_literal: true"
      output_stream.puts
      output_stream.puts @header
      output_stream.puts
      output_stream.puts "module #{@namespace}"
      output_stream.puts "  module #{module_name}"
      output_stream.puts "    extend ::Migrations::Enum"
      output_stream.puts
      output_stream.puts enum_values(enum.values)
      output_stream.puts "  end"
      output_stream.puts "end"
    end

    private

    def enum_values(values)
      values
        .sort_by { |_k, v| v }
        .map do |name, value|
          value = %Q|"#{value}"| if value.is_a?(String)
          "        #{::Migrations::Database::Schema.to_const_name(name)} = #{value}"
        end
        .join("\n")
    end
  end
end