# -*- encoding: utf-8 -*-

module TTY
  class Terminal

    # Return default width of terminal
    #
    # @example
    #   default_width = TTY::Terminal.default_width
    #
    # @return [Integer]
    #
    # @api public
    attr_reader :default_width

    # Return default height of terminal
    #
    # @example
    #   default_height = TTY::Terminal.default_height
    #
    # @return [Integer]
    #
    # @api public
    attr_reader :default_height

    # @api public
    attr_reader :color

    def initialize
      @color = TTY::Terminal::Color.new(self.color?)
      @echo  = TTY::Terminal::Echo.new
      @default_width  = 80
      @default_height = 24
    end

    # Set default width of terminal
    #
    # @param [Integer] width
    #
    # @return [Integer]
    #
    # @api public
    def default_width=(width)
      @default_width = width
    end

    # Set default height of terminal
    #
    # @example
    #   default_height = TTY::Terminal.default_height
    #
    # @return [Integer]
    #
    # @api public
    def default_height=(height)
      @default_height = height
    end

    # Determine current width
    #
    # @return [Integer] width
    #
    # @api width
    def width
      env_tty_columns = ENV['TTY_COLUMNS']
      if env_tty_columns =~ /^\d+$/
        result = env_tty_columns.to_i
      else
        result = TTY::System.unix? ? dynamic_width : default_width
      end
    rescue
      default_width
    end

    # Determine current height
    #
    # @api public
    def height
      env_tty_lines = ENV['TTY_LINES']
      if env_tty_lines =~ /^\d+$/
        result = env_tty_lines.to_i
      else
        result = TTY::System.unix? ? dynamic_height : self.default_height
      end
    rescue
      self.default_height
    end

    # Calculate dynamic width of the terminal
    #
    # @return [Integer] width
    #
    # @api public
    def dynamic_width
      @dynamic_width ||= (dynamic_width_stty.nonzero? || dynamic_width_tput)
    end

    # Calculate dynamic height of the terminal
    #
    # @return [Integer] height
    #
    # @api public
    def dynamic_height
      @dynamic_height ||= (dynamic_height_stty.nonzero? || dynamic_height_tput)
    end

    # Detect terminal width with stty utility
    #
    # @return [Integer] width
    #
    # @api public
    def dynamic_width_stty
      %x{stty size 2>/dev/null}.split[1].to_i
    end

    # Detect terminal height with stty utility
    #
    # @return [Integer] height
    #
    # @api public
    def dynamic_height_stty
      %x{stty size 2>/dev/null}.split[0].to_i
    end

    # Detect terminal width with tput utility
    #
    # @return [Integer] width
    #
    # @api public
    def dynamic_width_tput
      %x{tput cols 2>/dev/null}.to_i
    end

    # Detect terminal height with tput utility
    #
    # @return [Integer] height
    #
    # @api public
    def dynamic_height_tput
      %x{tput lines 2>/dev/null}.to_i
    end

    # Check if terminal supports color
    #
    # @return [Boolean]
    #
    # @api public
    def color?
      %x{tput colors 2>/dev/null}.to_i > 2
    end

    def echo_on
      @echo.on
    end

    def echo_off
      @echo.off
    end

    # @api public
    def echo(is_on=true, &block)
      @echo.echo(is_on, &block)
    end

    # Find user home directory
    #
    # @return [String]
    #
    # @api public
    def home
      @home ||= Home.new.home
    end

  end # Terminal
end # TTY