#compdef timer

_timer() {

  typeset -A opt_args
  
  _arguments \
    '1: :->command' \
    '2: :->arg1' \
    '3: :->arg2' \
    '4: :->arg3'
  
  case "$state" in
    (command)
      _arguments '1:commands:(start stop report deadline refresh help)'
      ;;

    (arg1)
      case $words[2] in
        (start)
          compadd $(timer tasklist)
          ;;
        (report)
          compadd day week month $(timer tasklist)
          ;;
        (deadline)
          compadd set clear all $(timer deadlist)
          ;;
      esac
      ;;

    (arg2)
      case $words[2] in
        (report)
          case $words[3] in
            (day)
              compadd $(date +"%Y-%m-%d")
            ;;
            (week)
              compadd $(date +"%Y-%m-%d")
            ;;
            (month)
              compadd $(date +"%Y-%m-%d")
            ;;
          esac
        ;;
        (deadline)
          case $words[3] in
            (set)
              compadd $(timer tasklist) $(date +"%Y-%m-%d")
            ;;
            (clear)
              compadd $(timer deadlist)
            ;;
          esac
        ;;
      esac
      ;;

    (arg3)
      if [ "$words[2]" = "deadline" ]
      then
        compadd $(date +"%Y-%m-%d")
      fi
    ;;
  esac  
}

_timer "$@"