#!/usr/bin/env ruby
require 'gli'
require 'reveal-ck'

class RevealCKExecutable
  extend GLI::App

  program_desc 'A reveal.js construction kit'

  version RevealCK::VERSION

  desc 'Generate reveal.js slides'
  command :generate do |c|

    slide_files = FileList['slides.*']
    default_file = slide_files.empty? ? nil : slide_files.first

    c.desc 'The file containing your slide content'
    c.flag [:f, :file], default_value: default_file

    c.desc 'The directory to place your generated slides in'
    c.flag [:d, :dir], default_value: 'slides'

    c.action do |_, options, _|
      slides_file = options[:file]
      if slides_file.nil?
        puts
        puts 'Problem:'
        puts
        puts '  reveal-ck could not find a slides file, and it cannnot build'
        puts '  your presentation without one.'
        puts
        puts '  It thinks anything that matches "slides.*" is a slides file.'
        puts
        puts '  Some examples are: slides.md, slides.html, slides.haml'
        puts
        msg = 'Create a file matching slides.* to proceed, such as slides.md.'
        exit_now!(msg)
      end
      puts "Generating slides for '#{slides_file}'.."
      builder_args = {
        user_dir: Dir.pwd,
        gem_dir: RevealCK.path,
        output_dir: options[:dir],
        slides_file: options[:file]
      }
      slides_builder =
        RevealCK::Builders::SlidesBuilder.new(builder_args)
      slides_builder.prepare
      slides_builder.build
    end
  end

  desc 'Start webserver so slides are available via http'
  command :serve, :server do |c|

    c.desc 'The directory to serve up'
    c.flag [:d, :dir], default_value: 'slides'

    c.desc 'The port to serve on'
    c.flag [:p, :port], default_value: 10_000

    c.action do |_, options, _|
      dir = options[:dir]
      port = options[:port]

      require 'webrick'
      server = WEBrick::HTTPServer.new Port: port, DocumentRoot: dir
      trap('INT') { server.shutdown }

      puts
      puts
      puts "\tServing up slide content in '#{dir}/'."
      puts
      puts "\tOpen your browser to 'http://localhost:#{port}'."
      puts
      puts "\tPress CTRL-C to stop serving slides."
      puts
      puts
      server.start
    end
  end
  exit run(ARGV)
end