require 'optparse'

module DevenvBuild
  class Cli
    def initialize (cmdargs)
      @args = cmdargs
      self
    end

    def run
      options = parse_command_line(@args)

      DevenvBuild::Files::Vagrantfile.new(options).generate
      DevenvBuild::Files::Provision.new(options).generate
    end

    private

    def default_options
      options = {}
      options[:destination_directory] = nil
      options[:box_name] = nil

      Provisioning.provisioning_modules.map do |module_name, mod|
        options[module_name] = false
      end

      options
    end

    def parse_command_line (args)
      options = default_options

      o = OptionParser.new do |opts|
        opts.banner = "Generate a Vagrant development environment with the selected programming languages and tools.\n\n"

        opts.on('-d', '--directory=DIRECTORY', 'Target directory where to create the environment on.') do |dir|
          options[:destination_directory] = dir
        end

        opts.on('-n', '--devenv-name=NAME', 'Name of your development environment.') do |dir|
          options[:box_name] = dir
        end

        opts.on('--all', 'Install everything.') do |dir|
          options[:all] = true
        end

        Provisioning.provisioning_modules.map do |module_name, mod|
          opts.on("--#{module_name}", mod.help, &mod.options_setter(module_name, options))
        end

        opts.on('-h', '--help', 'Print this screen.') do |dir|
          puts opts
          exit
        end
      end

      begin
        o.parse!(args)

        Provisioning.provisioning_modules.map do |module_name, mod|
          mod.options_setter(module_name, options).call
        end if options[:all]

        if options[:destination_directory].nil?
          puts "Need a target directory.\n\n"
          raise OptionParser::MissingArgument
        end

        unless Provisioning.provisioning_modules.keys.any? { |module_name| options[module_name] }
          puts "You need to specify at least one thing to include.\n\n"
          raise OptionParser::MissingArgument
        end
      rescue
        puts o
        exit
      end

      options
    end
  end
end