#!/bin/bash
# shellcheck source=kzcommon.sh
# ##################################################################################################
# GUI-wijzigingen tonen.
#
# Geschreven door Karel Zimmer (https://karelzimmer.nl).
# ##################################################################################################
# REL_NUM=09.00.07
# REL_DAT=2020-07-23
# REL_MSG='Auteursrechttekst verwijderd'

# ##################################################################################################
# Settings
# ##################################################################################################
source "$(dirname "$0")"/kzcommon.sh

# --------------------------------------------------------------------------------------------------
# Global constants
# --------------------------------------------------------------------------------------------------
# Bij aanpassingen ook .completion aanpassen!
readonly OPTIONS_SHORT=$OPTIONS_SHORT_COMMON
readonly OPTIONS_LONG=$OPTIONS_LONG_COMMON
readonly USAGE="Gebruik: $PROGNAME $OPTIONS_USAGE_COMMON

$OPTIONS_LONG_SHORT"
readonly HELP="Gebruik: $PROGNAME [OPTIE...]

GUI-wijzigingen tonen.

Opties:
  $OPTIONS_LONG_SHORT

$OPTIONS_HELP_COMMON"

# --------------------------------------------------------------------------------------------------
# Global variables
# --------------------------------------------------------------------------------------------------
declare CONFIG_A=''
declare CONFIG_B=''

# ##################################################################################################
# Functions
# ##################################################################################################
check_input() {
    local -i getopt_rc=0
    local parsed=''

    set +o errexit
    parsed=$(getopt --alternative                       \
                    --options       "$OPTIONS_SHORT"    \
                    --longoptions   "$OPTIONS_LONG"     \
                    --name          "$PROGNAME"         \
                    -- "$@")
    getopt_rc=$?
    set -o errexit
    if [[ $getopt_rc -ne 0 ]]; then
        printf '%s\n' "$USAGELINE" >&2
        QUIET=true exit $ERROR
    fi
    eval set -- "$parsed"
    process_general_options "$@"

    while true; do
        case $1 in
            --)
                shift
                break
                ;;
            *)
                shift
                ;;
        esac
    done

    if [[ "$*" ]]; then
        printf "$PROGNAME: %s\n%s\n" 'geen argumenten opgeven' "$USAGELINE" >&2
        QUIET=true exit $ERROR
    fi

    check_user
}

process_input() {
    CONFIG_A=$(mktemp -t "$PROGNAME-A-XXXXXXXXXX.lst")
    save_configuration_database A "$CONFIG_A"
    request_input
    CONFIG_B=$(mktemp -t "$PROGNAME-B-XXXXXXXXXX.lst")
    save_configuration_database B "$CONFIG_B"
    report_database_changes "$CONFIG_A" "$CONFIG_B"
}

save_configuration_database() {
    local fase=${1:-fase?}
    local output_file=${2:-output_file?}

    gsettings list-recursively > "$output_file" 2> >($LOGCMD)

    sort --unique --output="$output_file" "$output_file"

    info "Inhoud configuratie-database vastgelegd ($fase)."
}

request_input() {
    info "Voer nu de wijziging uit in de grafische werkomgeving."
    read -rp 'Druk op de Enter-toets wanneer gereed [Enter] ' </dev/tty
}

report_database_changes() {
    local output_file1=${1:-output_file1?}
    local output_file2=${2:-output_file2?}
    local -i diff_rc=0

    info "Wijzigingen in de configuratie-database,
< is de oude   instelling (A),
> is de nieuwe instelling (B):"
    set +o errexit
    diff "$output_file1" "$output_file2" | grep --regexp='[>|<]'
    diff_rc=${PIPESTATUS[0]}
    set -o errexit
    if [[ $diff_rc -eq 0 ]]; then
        info "Geen wijzigingen in de configuratie-database."
    else
        info "Voer uit: ${BLUE}gsettings set WIJZIGING${NORMAL}"
    fi
}

process_script() {
    check_input "$@"
    process_input
}

term_script() {
    rm "$CONFIG_A" "$CONFIG_B"
    QUIET=true exit $SUCCESS
}

# ##################################################################################################
# Main line
# ##################################################################################################
main() {
    init_script
    process_script "$@"
    term_script
}

main "$@"

# EOF