# frozen_string_literal: true

module Meroku
  # This class handles command line options.
  class Options
    def initialize
      @options = {}
    end

    def parse(command_line_args)
      define_options(command_line_args).parse!(command_line_args)
      @options
    end

    private

    def define_options(_args)
      OptionParser.new do |opts|
        opts.banner = 'Usage: meroku [options]'

        opts.on('--help', 'Prints this help') do
          puts opts
        end

        add_users_options(opts)
        opts.separator ''
        add_maintainers_options(opts)
      end
    end

    def add_users_options(opts)
      option(opts, '--login EMAIL,PASSWORD', Array) do |list|
        @options[:login] = true
        @options[:email] = list[0]
        @options[:password] = list[1]
      end
      option(opts, '--logout') do
        @options[:logout] = true
      end
    end

    def add_maintainers_options(opts)
      option(opts, '--spawn MEROKU_SECRET') do |meroku_secret|
        @options[:spawn] = true
        @options[:meroku_secret] = meroku_secret
      end
      option(opts, '--despawn MEROKU_SECRET') do |meroku_secret|
        @options[:despawn] = true
        @options[:meroku_secret] = meroku_secret
      end
    end

    # Sets a value in the @options hash, based on the given long option and its
    # value, in addition to calling the block if a block is given.
    def option(opts, *args)
      long_opt_symbol = long_opt_symbol(args)
      args += Array(OptionsHelp::TEXT[long_opt_symbol])
      opts.on(*args) do |arg|
        @options[long_opt_symbol] = arg
        yield arg if block_given?
      end
    end

    # Finds the option in `args` starting with -- and converts it to a symbol,
    # e.g. [..., '--auto-correct', ...] to :auto_correct.
    def long_opt_symbol(args)
      long_opt = args.find { |arg| arg.start_with?('--') }
      long_opt[2..-1].sub(/ .*/, '').tr('-', '_').gsub(/[\[\]]/, '').to_sym
    end
  end

  # This module contains help texts for command line options.
  module OptionsHelp
    TEXT = {
      version:               'Display version.',
      spawn:                 'Spawn infrastructure'
    }.freeze
  end
end