#!/bin/bash
# shellcheck source=kzcommon.sh
#-------------------------------------------------------------------------------
# Controlebestanden opsplitsen.
#
# Geschreven door Karel Zimmer <info@karelzimmer.nl>.
#
# Auteursrecht © 2016-2020 Karel Zimmer.
# GNU Algemene Publieke Licentie v3 <https://www.gnu.org/licenses/gpl.html>.
#
# REL_NUM=08.00.19
# REL_DAT=2020-10-15
# REL_MSG="Ontkenning in 'if' verplaatst"
#-------------------------------------------------------------------------------

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

#-------------------------------------------------------------------------------
# Global constants
#-------------------------------------------------------------------------------
readonly SEARCHDIR=$HOME/Downloads
readonly HASHPROG=sha256sum

# 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...]

Controlebestanden opsplitsen.

Opties:
  $OPTIONS_LONG_SHORT

$OPTIONS_HELP_COMMON"

#-------------------------------------------------------------------------------
# Global variables
#-------------------------------------------------------------------------------
declare ISO_FILE=''
declare ISO_FILE_FOUND=false

#-------------------------------------------------------------------------------
# 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

    # Als tui-script gestart zoals een gui-script.
    if $OPTION_GUI; then
        OPTION_GUI=false
        TERMINAL=true
    fi

    check_user
}

process_input() {
    cd "$SEARCHDIR"

    for ISO_FILE in *.iso; do

        if ! [[ -f "$ISO_FILE" ]]; then
            continue
        fi

        ISO_FILE_FOUND=true

        create_checksum_file

    done

    if ! $ISO_FILE_FOUND; then
        warning "Geen beeldbestanden (.iso) gevonden in '$SEARCHDIR'."
        rm --force -- *SHA256SUMS
    fi
}

create_checksum_file() {
    local -i grep_rc=0

    if [[ -e $ISO_FILE.sha256sum ]]; then
        info "Beeldbestand '$ISO_FILE' heeft al controlebestand \
'$ISO_FILE.sha256sum'.\n"
        return 0
    else
        set +o errexit
        # shellcheck disable=SC2062
        grep    --word-regexp           \
                --regexp=" $ISO_FILE"   \
                --regexp="*$ISO_FILE"   \
                --exclude=*.iso         \
                --exclude-dir=*         \
                --no-filename           \
                -- *                    \
                > "$ISO_FILE".sha256sum \
                2> >($LOGCMD)
        grep_rc=$?
        set +o errexit

        if [[ $grep_rc -ne 0 ]]; then
            error "Geen controlesom gevonden voor '$ISO_FILE'.\n"
            rm --force "$ISO_FILE".sha256sum
        else
            info "Controlebestand '$ISO_FILE.sha256sum' aangemaakt.\n"
       fi
    fi
}

term_script() {
    if $ISO_FILE_FOUND; then
        info "Om de beeldbestanden (.iso) te controleren voer uit:
    ${BLUE}cd $SEARCHDIR;$HASHPROG --check *.$HASHPROG; cd -${NORMAL}

En om vervolgens USB-sticks te maken voer uit:
    ${BLUE}kzmkusbs${NORMAL}

Om de controlebestanden (.sha256sums) opnieuw te downloaden voer uit:
    ${BLUE}kzdlsio --checksums${NORMAL}"
        rm --force -- *SUM*
    fi
    QUIET=true exit $SUCCESS
}

process_script() {
    check_input "$@"
    process_input
}

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

main "$@"

# EOF