#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-2.0-only
# written by Tobias Powalowski <tpowa@archlinux.org>
_ANSWER="/tmp/.tz"
_TITLE="Archboot | Arch Linux Setup | Clock Configuration"
# _dialog()
# an el-cheapo dialog wrapper
#
# parameters: see dialog(1)
# returns: whatever dialog did
_dialog() {
    dialog --backtitle "${_TITLE}" --aspect 15 "$@"
    return $?
}

_dohwclock() {
    echo 0.0 0 0.0 > /etc/adjtime
    echo 0 >> /etc/adjtime
    [[ "${_HARDWARECLOCK}" = "UTC" ]] && echo UTC >> /etc/adjtime
    [[ "${_HARDWARECLOCK}" = "" ]] && echo LOCAL >> /etc/adjtime
    if [[ "${_HARDWARECLOCK}" = "UTC" ]]; then
        timedatectl set-local-rtc 0
        _DATE_PROGRAM=timedatectl
    else
        timedatectl set-local-rtc 1
        #shellcheck disable=SC2209
        _DATE_PROGRAM=date
    fi
}

_dotimezone () {
    _SET_ZONE=""
    while [[ -z "${_SET_ZONE}" ]]; do
        _REGIONS="America - Europe - Africa - Asia - Australia -"
        #shellcheck disable=SC2086
        _dialog --menu "Please Select A Region:" 12 40 7 ${_REGIONS} 2>${_ANSWER}
        _REGION=$(cat ${_ANSWER})
        _ZONES=""
        for i in $(timedatectl --no-pager list-timezones | grep -w "${_REGION}" | cut -d '/' -f 2 | sort -u); do
            _ZONES="${_ZONES} ${i} -"
        done
        #shellcheck disable=SC2086
        _dialog --menu "Please Select A Timezone:" 22 40 16 ${_ZONES} 2>${_ANSWER} && _SET_ZONE="1"
        _ZONE=$(cat ${_ANSWER})
        [[ "${_ZONE}" == "${_REGION}" ]] || _ZONE="${_REGION}/${_ZONE}"
        if [[ -n "${_SET_ZONE}" ]]; then
            _dialog --infobox "Setting Timezone to ${_ZONE}..." 3 60
            timedatectl set-timezone "${_ZONE}"
            sleep 2
        else
            return 1
        fi
    done
}

_dotimeset() {
    if [[ -z "${_SET_ZONE}" ]]; then
        _dialog --msgbox "Error:\nYou have to select timezone first." 0 0
        dotimezone || return 1
    fi
    _SET_TIME=""
    while [[ -z "${_SET_TIME}" ]]; do
        _HARDWARECLOCK=""
        _DATE_PROGRAM=""
        _dialog --yesno "Do you want to use UTC for your clock?\n\nIf you choose 'YES' UTC (recommended default) is used,\nwhich ensures daylightsaving is set automatically.\n\nIf you choose 'NO' Localtime is used, which means\nthe system will not change the time automatically.\nLocaltime is also prefered on dualboot machines,\nwhich also run Windows, because UTC may confuse it." 14 60 && _HARDWARECLOCK="UTC"
        _dohwclock
        # check internet connection
        if ping -c1 www.google.com &>/dev/null; then
            if _dialog --yesno \
            "Do you want to use the Network Time Protocol (NTP) for syncing your clock, by using the internet clock pool?" 6 60; then
                _dialog --infobox "Syncing clock with NTP pool..." 3 45
                # sync immediatly with standard pool
                if ! systemctl restart systemd-timesyncd; then
                    _dialog --msgbox "An error has occured, time was not changed!" 0 0
                    return 1
                fi
                # enable background syncing
                timedatectl set-ntp 1
                _SET_TIME="1"
            fi
        fi
        if [[ -z "${_SET_TIME}" ]]; then
            timedatectl set-ntp 0
            # display and ask to set date/time
            dialog --calendar "Set the date.\nUse <TAB> to navigate and arrow keys to change values." 0 0 0 0 0 2> ${_ANSWER} || return 1
            _DATE="$(cat ${_ANSWER})"
            dialog --timebox "Set the time.\nUse <TAB> to navigate and up/down to change values." 0 0 2> ${_ANSWER} || return 1
            _TIME="$(cat ${_ANSWER})"
            # save the time
            # DD/MM/YYYY hh:mm:ss -> YYYY-MM-DD hh:mm:ss
            _DATETIME="$(echo "${_DATE}" "${_TIME}" | sed 's#\(..\)/\(..\)/\(....\) \(..\):\(..\):\(..\)#\3-\2-\1 \4:\5:\6#g')"
            timedatectl set-time "${_DATETIME}"
            _SET_TIME="1"
        fi
        if _dialog --cr-wrap --defaultno --yesno "Your current time and date is:\n$(${_DATE_PROGRAM})\n\nDo you want to change it?" 0 0; then
            _SET_TIME=""
        else
            _dialog --infobox "Time and Date setting completed successfully.\nContinuing in 5 seconds..." 4 60
            sleep 5
            return 0
        fi
    done
}

if [[ -e /tmp/.tz-running ]]; then
    echo "tz already runs on a different console!"
    echo "Please remove /tmp/.tz-running first to launch tz!"
    exit 1
fi
: >/tmp/.tz-running
if ! _dotimezone; then
    [[ -e /tmp/.tz ]] && rm /tmp/.tz
    [[ -e /tmp/.tz-running ]] && rm /tmp/.tz-running
    clear
    exit 1
fi
if ! _dotimeset; then
    [[ -e /tmp/.tz ]] && rm /tmp/.tz
    [[ -e /tmp/.tz-running ]] && rm /tmp/.tz-running
    clear
    exit 1
fi
[[ -e /tmp/.tz ]] && rm /tmp/.tz
[[ -e /tmp/.tz-running ]] && rm /tmp/.tz-running
clear
exit 0
# vim: set ts=4 sw=4 et: