# frozen_string_literal: true

require_relative "eval"

module Byebug
  module Helpers
    #
    # Utilities for variable subcommands
    #
    module VarHelper
      include EvalHelper

      def var_list(ary, binding = context.frame._binding)
        vars = ary.sort.map do |name|
          code = name.to_s

          if code == "$SAFE" && Gem.ruby_version >= Gem::Version.new("2.7.0.preview3")
            code = <<~RUBY
              original_stderr = $stderr

              begin
                $stderr = StringIO.new

                #{code}
              ensure
                $stderr = original_stderr
              end
            RUBY
          end

          [name, safe_inspect(silent_eval(code, binding))]
        end

        puts prv(vars, "instance")
      end

      def var_global
        globals = global_variables.reject do |v|
          %i[$IGNORECASE $= $KCODE $-K $binding].include?(v)
        end

        var_list(globals)
      end

      def var_instance(str)
        obj = warning_eval(str || "self")

        var_list(obj.instance_variables, obj.instance_eval { binding })
      end

      def var_local
        locals = context.frame.locals
        cur_self = context.frame._self
        locals[:self] = cur_self unless cur_self.to_s == "main"
        puts prv(locals.keys.sort.map { |k| [k, locals[k]] }, "instance")
      end

      def var_args
        args = context.frame.args
        return if args == [[:rest]]

        all_locals = context.frame.locals
        arg_values = args.map { |arg| arg[1] }

        locals = all_locals.select { |k, _| arg_values.include?(k) }
        puts prv(locals.keys.sort.map { |k| [k, locals[k]] }, "instance")
      end
    end
  end
end
