#! /usr/bin/env bash

set -euo pipefail

function usage() {
    echo "Usage: bin/backup-config [OPTIONS] [DESTINATION]"
    echo ""
    echo "Backup configuration files, to DESTINATION"
    echo ""
    echo "Options:"
    echo "  -m              mode: zip | tar | copy (default=copy)"
    echo ""
    echo "Examples:"
    echo ""
    echo "    bin/backup-config -m zip ~/overleaf-config-backup.zip"
    echo ""
    echo "    bin/backup-config -m tar ~/overleaf-config-backup.tar"
    echo ""
    echo "    bin/backup-config -m copy ~/overleaf-config-backup"
    echo ""
    echo "    bin/backup-config ~/overleaf-config-backup"
    echo ""
}

function __main__() {
    mode='copy'

    while getopts "m:" opt
    do
        case $opt in
            m ) mode="${OPTARG}" ;;
            \?) usage && exit ;;
        esac
    done
    shift $(( OPTIND -1 ))

    if [[ "${1:-null}" == "null" ]] \
        || [[ "${1:-null}" == "help" ]] \
        || [[ "${1:-null}" == "--help" ]] ; then
        usage && exit
    fi

    destination="$1"

    if [[ "$mode" == "copy" ]]; then
        cp -r config "$destination"
    elif [[ "$mode" == "zip" ]]; then
        zip -r "$destination" config
    elif [[ "$mode" == "tar" ]]; then
        tar -cf "$destination" config/*
    else
        echo "Error: unrecognized mode '$mode'"
        exit 1
    fi
}

__main__ "$@"