#!/usr/bin/ruby

$:.unshift(File.join(File.dirname(File.symlink?(__FILE__) ? File.readlink(__FILE__) : __FILE__), '../lib'))
require 'motion/version'

class Command
  class << self
    attr_accessor :name
    attr_accessor :help
  end
end

class CreateCommand < Command
  self.name = 'create'
  self.help = 'Create a new project'

  def self.run(args)
    if args.size != 1
      $stderr.puts "Please specify an app name (e.g. motion create Hello)"
      return false 
    end

    app_name = args.shift

    unless app_name.match(/^[a-zA-Z\d\s]+$/)
      $stderr.puts "Invalid app name"
      return false
    end

    if File.exist?(app_name)
      $stderr.puts "Directory `#{app_name}' already exists"
      return false
    end

    motion_libdir = File.expand_path(File.join(__FILE__, '../../lib'))
 
    Dir.mkdir(app_name)
    Dir.chdir(app_name) do
      File.open('Rakefile', 'w') do |io|
        io.puts <<EOS
$:.unshift(\"#{motion_libdir}\")
require 'motion/rake'

Motion::App.setup do |app|
  # Use `rake config' to see complete project settings.
  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
end

class UpdateCommand < Command
  self.name = 'update'
  self.help = 'Update current distribution'

  def self.run(args)
    $stderr.puts "update command not implemented yet"
    return false
  end
end

class MotionMainCommand
  Commands = [CreateCommand, UpdateCommand]

  def initialize(args)
    arg = args.shift
    case arg
      when '-h', '--help'
        usage
      when '-v', '--version'
        $stdout.puts Motion::Version
        exit 1
      when /^-/
        $stderr.puts "Unknown option: #{arg}"
        exit 1
    end
    command = Commands.find { |command| command.name == arg }
    usage unless command
    exit command.run(args) ? 0 : 1
  end

  def usage
    $stderr.puts 'Usage:'
    $stderr.puts "  #{File.basename(__FILE__)} [-h, --help]"
    $stderr.puts "  #{File.basename(__FILE__)} [-v, --version]"
    $stderr.puts "  #{File.basename(__FILE__)} <command> [<args...>]"
    $stderr.puts ''
    $stderr.puts 'Commands:'
    Commands.each do |command|
      $stderr.puts "  #{command.name}".ljust(15) + command.help
    end
    exit 1
  end
end

MotionMainCommand.new(ARGV)