# typed: true
require 'cli/ui'
require 'io/console'

module CLI
  module UI
    module Terminal
      extend T::Sig

      DEFAULT_WIDTH = 80
      DEFAULT_HEIGHT = 24

      # Returns the width of the terminal, if possible
      # Otherwise will return DEFAULT_WIDTH
      #
      sig { returns(Integer) }
      def self.width
        winsize[1]
      end

      # Returns the width of the terminal, if possible
      # Otherwise, will return DEFAULT_HEIGHT
      #
      sig { returns(Integer) }
      def self.height
        winsize[0]
      end

      sig { returns([Integer, Integer]) }
      def self.winsize
        @winsize ||= begin
          winsize = IO.console.winsize
          setup_winsize_trap

          if winsize.any?(&:zero?)
            [DEFAULT_HEIGHT, DEFAULT_WIDTH]
          else
            winsize
          end
        rescue
          [DEFAULT_HEIGHT, DEFAULT_WIDTH]
        end
      end

      sig { void }
      def self.setup_winsize_trap
        @winsize_trap ||= Signal.trap('WINCH') do
          @winsize = nil
        end
      end
    end
  end
end