# frozen_string_literal: true
module Bundler
  # Returns current version of Ruby
  #
  # @return [CurrentRuby] Current version of Ruby
  def self.current_ruby
    @current_ruby ||= CurrentRuby.new
  end

  class CurrentRuby
    KNOWN_MINOR_VERSIONS = %w(
      1.8
      1.9
      2.0
      2.1
      2.2
      2.3
      2.4
    ).freeze

    KNOWN_MAJOR_VERSIONS = KNOWN_MINOR_VERSIONS.map {|v| v.split(".", 2).first }.uniq.freeze

    KNOWN_PLATFORMS = %w(
      jruby
      maglev
      mingw
      mri
      mswin
      mswin64
      rbx
      ruby
      x64_mingw
    ).freeze

    def ruby?
      !mswin? && (!defined?(RUBY_ENGINE) || RUBY_ENGINE == "ruby" || RUBY_ENGINE == "rbx" || RUBY_ENGINE == "maglev")
    end

    def mri?
      !mswin? && (!defined?(RUBY_ENGINE) || RUBY_ENGINE == "ruby")
    end

    def rbx?
      ruby? && defined?(RUBY_ENGINE) && RUBY_ENGINE == "rbx"
    end

    def jruby?
      defined?(RUBY_ENGINE) && RUBY_ENGINE == "jruby"
    end

    def maglev?
      defined?(RUBY_ENGINE) && RUBY_ENGINE == "maglev"
    end

    def mswin?
      Bundler::WINDOWS
    end

    def mswin64?
      Bundler::WINDOWS && Gem::Platform.local.os == "mswin64" && Gem::Platform.local.cpu == "x64"
    end

    def mingw?
      Bundler::WINDOWS && Gem::Platform.local.os == "mingw32" && Gem::Platform.local.cpu != "x64"
    end

    def x64_mingw?
      Bundler::WINDOWS && Gem::Platform.local.os == "mingw32" && Gem::Platform.local.cpu == "x64"
    end

    (KNOWN_MINOR_VERSIONS + KNOWN_MAJOR_VERSIONS).each do |version|
      trimmed_version = version.tr(".", "")
      define_method(:"on_#{trimmed_version}?") do
        RUBY_VERSION.start_with?("#{version}.")
      end

      KNOWN_PLATFORMS.each do |platform|
        define_method(:"#{platform}_#{trimmed_version}?") do
          send(:"#{platform}?") && send(:"on_#{trimmed_version}?")
        end
      end
    end
  end
end
