module BinInstall
  module Ruby
    module Rbenv
      DOCTOR = 'curl -fsSL https://github.com/rbenv/rbenv-installer/raw/master/bin/rbenv-doctor | bash'.freeze

      def self.install
        if Ruby::Rvm.installed?
          puts 'RVM is already installed. Skipping rbenv install.'.yellow
        else
          puts 'Installing rbenv...'.white
          Brew::Package.install('rbenv')
          Brew::Package.install_or_upgrade('ruby-build')
          Shell.append_to_profiles(%{eval "$(rbenv init -)"\n})
          require_shims!
          install_ruby
          doctor
        end
      end

      def self.install!
        if Ruby::Rvm.installed?
          abort('RVM is already installed. Aborting rbenv install.'.red)
        else
          puts 'Installing rbenv...'.white
          Brew::Package.install!('rbenv')
          Brew::Package.install_or_upgrade!('ruby-build')
          Shell.append_to_profiles!(%{eval "$(rbenv init -)"\n})
          require_shims!
          install_ruby!
          doctor!
        end
      end

      def self.install_ruby(version = Ruby.required_ruby_version)
        puts "Installing Ruby #{version}...".white

        if version
          if Ruby.ruby_version_installed?(version)
            puts "Ruby #{version} is already installed. Skipping Ruby #{version} install.".blue
          else
            system("rbenv install #{version}")
          end
        else
          puts 'Unknown Ruby version. Create .ruby-version file.'
        end
      end

      def self.install_ruby!(version = Ruby.required_ruby_version)
        puts "Installing Ruby #{version}...".white

        if version
          if Ruby.ruby_version_installed?(version)
            puts "Ruby #{version} is already installed. Skipping Ruby #{version} install.".blue
          else
            BinInstall.system!("rbenv install #{version}")
          end
        else
          abort('Unknown Ruby version. Create .ruby-version file.'.red)
        end
      end

      def self.doctor
        system(DOCTOR)
      end

      def self.doctor!
        BinInstall.system!(DOCTOR)
      end

      def self.require_shims!
        abort_install! unless `#{DOCTOR}`.include?('Checking for rbenv shims in PATH: OK')
      end

      def self.abort_install!
        puts 'Warning rbenv shims are not loaded.'.yellow
        puts 'Try closing this window and restarting your shell session.'.yellow
        puts "\n"
        puts 'Rerun the installer with:'
        puts '$ bin/install'.cyan
        puts "\n"
        abort('Aborting install.'.red)
      end

      def self.rehash
        system('rbenv rehash')
      end

      def self.rehash!
        BinInstall.system!('rbenv rehash')
      end

      def self.version
        system('rbenv version')
      end

      def self.version!
        BinInstall.system!('rbenv version')
      end

      def self.installed?
        Shell.executable_exists?('rbenv')
      end
    end
  end
end