module Stack
  class Watcher
    attr_accessor :source, :target
    attr_accessor :generator
    attr_accessor :directory_watcher
    attr_accessor :keep_alive
    
    def initialize(generator)
      self.generator = generator
      self.source = self.generator.source
      self.target = self.generator.target
      
      self.keep_alive = true
    end
    
    def observe
      dirs = ""
      
      Dir.chdir(self.source) do
        dirs = Dir['*'].select { |x| File.directory?(x) }
        dirs -= ['_stack']
        dirs = dirs.map { |x| "#{x}/**/*" }
        dirs += ['*']
      end
      
      self.directory_watcher = DirectoryWatcher.new(self.source)
      self.directory_watcher.interval = 1
      self.directory_watcher.glob = dirs
      
      self.directory_watcher.add_observer do |*args|
        time = Time.now.strftime("%Y-%m-%d %H:%M:%S")
        puts "[#{time}] #{args.size} files changed."
        self.generator.process!
        self.generator.transform!
        
        time = Time.now.strftime("%Y-%m-%d %H:%M:%S")
        puts "[#{time}] #{args.size} files processed."
      end
      
      self.directory_watcher.start
      
      if self.keep_alive
        loop { sleep 1000 }
      end
    end
  end
end