#!/usr/bin/env bash

# shellcheck disable=SC2155
readonly PROGNAME=$(basename "${0}")
# shellcheck disable=SC2155
readonly PROGDIR=$(readlink -m "$(dirname "${0}")")
# shellcheck disable=SC2124
readonly ARGS=$@

# Change this to wherever you install the libraries
readonly LIBDIR="/usr/local/lib/evobackup"

source "${LIBDIR}/main.sh"

show_version() {
    cat <<END
${PROGNAME} version ${VERSION}

Copyright 2023 Evolix <info@evolix.fr>,
               Gregory Colpart <reg@evolix.fr>,
               Romain Dessort <rdessort@evolix.fr>,
               Benoit Série <bserie@evolix.fr>,
               Tristan Pilat <tpilat@evolix.fr>,
               Victor Laborie <vlaborie@evolix.fr>,
               Jérémy Lecour <jlecour@evolix.fr>
               and others.

${PROGNAME} comes with ABSOLUTELY NO WARRANTY.  This is free software,
and you are welcome to redistribute it under certain conditions.
See the GNU General Public License v3.0 for details.
END
}
show_help() {
    cat <<END
${PROGNAME} helps managing evobackup scripts

Options
 -h, --help                  print this message and exit
 -V, --version               print version and exit
     --copy-template=PATH    copy the backup template to PATH
END
}

copy_template() {
    dest_path=${1}
    dest_dir="$(dirname "${dest_path}")"

    if [ -e "${dest_path}" ]; then
        printf "Path for new evobackup script '%s' already exists.\n" "${dest_path}" >&2
        exit 1
    elif [ ! -e "${dest_dir}" ]; then
        printf "Parent directory '%s' doesn't exist. Create it first.\n" "${dest_dir}" >&2
        exit 1
    else
        if cp "${LIBDIR}/zzz_evobackup.sh" "${dest_path}"; then
            chmod 750 "${dest_path}"

            sed -i "s|@COMMAND@|${PROGDIR}/${PROGNAME} ${ARGS}|" "${dest_path}"
            sed -i "s|@DATE@|$(date --iso-8601=seconds)|" "${dest_path}"
            sed -i "s|@VERSION@|${VERSION}|" "${dest_path}"

            printf "New evobackup script has been saved to '%s'.\n" "${dest_path}"
            printf "Remember to customize it (mail notifications, backup servers…).\n"
            exit 0
        fi
    fi
}

main() {
    # Parse options, based on https://gist.github.com/deshion/10d3cb5f88a21671e17a
    while :; do
        case ${1:-''} in
            -V|--version)
                show_version
                exit 0
                ;;
            -h|--help)
                show_help
                exit 0
                ;;
            --copy-template)
                # copy-template option, with value separated by space
                if [ -n "$2" ]; then
                    copy_template "${2}"
                    shift
                else
                    printf "'%s' requires a non-empty option argument.\n" "--copy-template" >&2
                    exit 1
                fi
                ;;
            --copy-template=?*)
                # copy-template option, with value separated by =
                copy_template "${1#*=}"
                ;;
            --copy-template=)
                # copy-template option, without value
                printf "'%s' requires a non-empty option argument.\n" "--copy-template" >&2
                exit 1
                ;;
            --)
                # End of all options.
                shift
                break
                ;;
            -?*|[[:alnum:]]*)
                # ignore unknown options
                printf "unknown option '%s'.\n" "${1}" >&2
                exit 1
                ;;
            *)
                # Default case: If no more options then break out of the loop.
                break
                ;;
        esac

        shift
    done
}

main ${ARGS}