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

_abort() {
    if _dialog --yesno "Abort Arch Linux Clock Configuration?" 5 45; then
        [[ -e /tmp/.clock-running ]] && rm /tmp/.clock-running
        [[ -e /tmp/.clock ]] && rm /tmp/.clock
        clear
        exit 1
    else
        _CONTINUE=""
    fi
}

_hwclock() {
    _DATE_PROGRAM=timedatectl
    echo 0.0 0 0.0 > /etc/adjtime
    echo 0 >> /etc/adjtime
    echo UTC >> /etc/adjtime
    timedatectl set-local-rtc 0
}

_timezone () {
    _SET_ZONE=""
    while [[ -z "${_SET_ZONE}" ]]; do
        _CONTINUE=""
        while [[ -z "${_CONTINUE}" ]]; do
            _REGIONS="America - Europe - Africa - Asia - Australia -"
            #shellcheck disable=SC2086
            if _dialog --cancel-label "${_LABEL}" --title " Timezone Region " --menu "" 11 30 6 ${_REGIONS} 2>${_ANSWER}; then
                _REGION=$(cat ${_ANSWER})
                _ZONES=""
                _CONTINUE=1
            else
                _abort
            fi
        done
        _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
        if _dialog --cancel-label "Back" --title " Timezone " --menu "" 21 30 16 ${_ZONES} 2>${_ANSWER}; then
            _SET_ZONE="1"
            _ZONE=$(cat ${_ANSWER})
            [[ "${_ZONE}" == "${_REGION}" ]] || _ZONE="${_REGION}/${_ZONE}"
            _dialog --infobox "Setting Timezone to ${_ZONE}..." 3 50
            timedatectl set-timezone "${_ZONE}"
            sleep 3
        else
            _SET_ZONE=""
        fi
    done
}

_timeset() {
    _hwclock
    # 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
                _SET_TIME=""
            else
                # enable background syncing
                timedatectl set-ntp 1
                _SET_TIME="1"
            fi
        fi
    fi
    if [[ -z "${_SET_TIME}" ]]; then
        timedatectl set-ntp 0
        # display and ask to set date/time
        _dialog --title " Date " --no-cancel --calendar "Use <TAB> to navigate and arrow keys to change values." 0 0 0 0 0 2> ${_ANSWER}
        _DATE="$(cat ${_ANSWER})"
        _dialog --title " Time " --no-cancel --timebox "Use <TAB> to navigate and up/down to change values." 0 0 2> ${_ANSWER}
        _TIME="$(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 "${_DATETIME}"
    fi
    if _dialog --cr-wrap --title " Summary " --yesno "$(${_DATE_PROGRAM})" 0 0; then
        _dialog --infobox "Clock configuration completed successfully." 3 50
        _SET_TIME="1"
        sleep 3
    else
        _SET_TIME=""
    fi
}

if [[ -e /tmp/.clock-running ]]; then
    echo "clock already runs on a different console!"
    echo "Please remove /tmp/.clock-running first to launch clock!"
    exit 1
fi
: >/tmp/.clock-running
_SET_TIME=""
if [[ -n "${1}" ]]; then
_LABEL="Back"
else
_LABEL="Exit"
fi
while [[ -z "${_SET_TIME}" ]]; do
    _timezone
    _timeset
done
[[ -e /tmp/.clock-running ]] && rm /tmp/.clock-running
clear
exit 0
# vim: set ts=4 sw=4 et: