#!/usr/bin/ruby

require 'optparse'

class RubixirCommandLine
  def initialize(argv)
    @argv = argv
    OptionParser.new do |opts|
      opts.banner = "Usage: #{File.basename(__FILE__)} [options] <args...>"
    
      opts.on('--update', 'Updates installation') { @mode = :update }
      opts.on('--irb', 'Starts interactive prompt') { @mode = :irb }
      opts.on('--create <app-name>', 'Creates new project') { |app_name| @mode = :create; @app_name = app_name }
      opts.on('--help', 'Display this message') { die opts } 
 
      begin
        opts.parse!(@argv)
      rescue OptionParser::InvalidOption => e
        die e, opts
      end
      die opts unless @mode
    end
  end

  def run
    case @mode
      when :create
        create_project
      when :irb
        start_irb
      when :update
        update_installation
      else
        die "unknown mode"
    end
  end

  private

  def create_project
    unless @app_name.match(/^[a-zA-Z\d\s]+$/)
      $stderr.puts "Invalid app name"
      exit 1
    end

    if File.exist?(@app_name)
      $stderr.puts "Directory `#{@app_name}' already exists"
      exit 1
    end
 
    Dir.mkdir(@app_name)
    Dir.chdir(@app_name) do
      File.open('Rakefile', 'w') do |io|
        io.puts <<EOS
require 'rubygems'
require 'rubixir/rake'

Motion::App.setup do |app|
  app.name = '#{@app_name}'
end
EOS
      end
      Dir.mkdir('app')
      File.open('app/main.rb', 'w') do |io|
        io.puts <<EOS
class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    puts "Hello World!"
  end
end
EOS
      end
      Dir.mkdir('resources')
    end
  end

  def start_irb
  end

  def update_installation
  end

  def die(*args)
    $stderr.puts *args
    exit 1
  end
end

RubixirCommandLine.new(ARGV).run