require 'thor'
require 'writefully/process'

module Writefully
  class CLI < Thor
    desc "start", "Start listening to the content directory"

    method_options %w( daemonize -d ) => :boolean
    method_options %w( config -c )    => :string

    def start
      config = Writefully.config_from(options.config)

      if options.daemonize?
        Process.daemon(true, true)
        pid = waitpid(spawn(listen(config)))
        write pid, config[:pidfile]
      else
        listen(config)
      end
    end

    desc "stop", "Stop listening for content directory changes"
    def stop(pidfile = nil)
      pid = open(pidfile).read.strip.to_i
      Process.kill("HUP", pid)
      true
    rescue Errno::ENOENT
      $stdout.puts "#{pidfile} does not exist: Errno::ENOENT"
      true
    rescue Errno::ESRCH
      $stdout.puts "The process #{pid} did not exist: Errno::ESRCH"
      true
    rescue Errno::EPERM
      $stderr.puts "Lack of privileges to manage the process #{pid}: Errno::EPERM"
      false
    rescue ::Exception => e
      $stderr.puts "While signaling the PID, unexpected #{e.class}: #{e}"
      false
    end

    no_tasks do 
      def listen(config)
        Writefully::Process.new(config).listen
      end

      def write pid, pidfile
        File.open pidfile, "w" do |f| 
          f.write pid
        end
      rescue ::Exception => e
        $stderr.puts "While writing the PID to file, unexpected #{e.class}: #{e}"
        Process.kill "HUP", pid
      end
    end
  end
end