# frozen_string_literal: true

module Dry
  class CLI
    # Command line option
    #
    # @since 0.1.0
    # @api private
    class Option
      # @since 0.1.0
      # @api private
      attr_reader :name

      # @since 0.1.0
      # @api private
      attr_reader :options

      # @since 0.1.0
      # @api private
      def initialize(name, options = {})
        @name = name
        @options = options
      end

      # @since 0.1.0
      # @api private
      def aliases
        options[:aliases] || []
      end

      # @since 0.1.0
      # @api private
      def desc
        desc = options[:desc]
        values ? "#{desc}: (#{values.join("/")})" : desc
      end

      # @since 0.1.0
      # @api private
      def required?
        options[:required]
      end

      # @since 0.1.0
      # @api private
      def type
        options[:type]
      end

      # @since 0.1.0
      # @api private
      def values
        options[:values]
      end

      # @since 0.1.0
      # @api private
      def boolean?
        type == :boolean
      end

      # @api private
      def flag?
        type == :flag
      end

      # @since 0.3.0
      # @api private
      def array?
        type == :array
      end

      # @since 0.1.0
      # @api private
      def default
        options[:default]
      end

      # @since 0.1.0
      # @api private
      def description_name
        options[:label] || name.upcase
      end

      # @since 0.1.0
      # @api private
      def argument?
        false
      end

      # @since 0.1.0
      # @api private
      #
      def parser_options
        dasherized_name = Inflector.dasherize(name)
        parser_options  = []

        if boolean?
          parser_options << "--[no-]#{dasherized_name}"
        elsif flag?
          parser_options << "--#{dasherized_name}"
        else
          parser_options << "--#{dasherized_name}=#{name}"
          parser_options << "--#{dasherized_name} #{name}"
        end

        parser_options << Array if array?
        parser_options << values if values
        parser_options.unshift(*alias_names) if aliases.any?
        parser_options << desc if desc
        parser_options
      end

      # @since 0.1.0
      # @api private
      def alias_names
        aliases
          .map { |name| name.gsub(/^-{1,2}/, "") }
          .compact
          .uniq
          .map { |name| name.size == 1 ? "-#{name}" : "--#{name}" }
          .map { |name| boolean? || flag? ? name : "#{name} VALUE" }
      end
    end

    # Command line argument
    #
    # @since 0.1.0
    # @api private
    class Argument < Option
      # @since 0.1.0
      # @api private
      def argument?
        true
      end
    end
  end
end