_timer()
{
    local uncomplete=${COMP_WORDS[COMP_CWORD]}
    
    case "$COMP_CWORD" in
        1)
            # Commands
            COMPREPLY=( $(compgen -W "start stop report deadline refresh help" -- $uncomplete) )
            ;;
        2)
            # Command argument 1
            case "${COMP_WORDS[1]}" in
                start)
                    local tasklist=$(timer tasklist)
                    COMPREPLY=( $(compgen -W "$tasklist" -- $uncomplete))
                    ;;
                report)
                    local tasklist=$(timer tasklist)
                    COMPREPLY=( $(compgen -W "day week month $tasklist" -- $uncomplete))
                    ;;
                deadline)
                    local deadlist=$(timer deadlist)
                    COMPREPLY=( $(compgen -W "set clear all $deadlist" -- $uncomplete))
                    ;;
            esac
            ;;
        3)
            # Command argument 2
            case "${COMP_WORDS[1]}" in
                report)
                    case "${COMP_WORDS[2]}" in
                        day)
                            local d=$(date +"%Y-%m-%d")
                            COMPREPLY=( $(compgen -W "$d" -- $uncomplete))
                        ;;
                        week)
                            local d=$(date +"%Y-%m-%d")
                            COMPREPLY=( $(compgen -W "$d" -- $uncomplete))
                        ;;
                        month)
                            local d=$(date +"%Y-%m-%d")
                            COMPREPLY=( $(compgen -W "$d" -- $uncomplete))
                        ;;
                    esac
                    ;;
                deadline)
                    case "${COMP_WORDS[2]}" in
                        set)
                            local tasklist=$(timer tasklist)
                            local d=$(date +"%Y-%m-%d")
                            COMPREPLY=( $(compgen -W "$tasklist $d" -- $uncomplete))
                        ;;
                        clear)
                            local deadlist=$(timer deadlist)
                            COMPREPLY=( $(compgen -W "$deadlist" -- $uncomplete))
                        ;;
                    esac
                    ;;
            esac
            ;;
        4)
            # Command argument 3
            if [ "${COMP_WORDS[1]}" = "deadline" ]
            then
                local d=$(date +"%Y-%m-%d")
                COMPREPLY=( $(compgen -W "$d" -- $uncomplete))
            fi
            ;;
    esac
}

complete -F _timer timer