#! /usr/bin/env bash

set -euo pipefail

#### Detect Toolkit Project Root ####
# if realpath is not available, create a semi-equivalent function
command -v realpath >/dev/null 2>&1 || realpath() {
  [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
}
SCRIPT_PATH="$(realpath "${BASH_SOURCE[0]}")"
SCRIPT_DIR="$(dirname "$SCRIPT_PATH")"
TOOLKIT_ROOT="$(realpath "$SCRIPT_DIR/..")"
if [[ ! -d "$TOOLKIT_ROOT/bin" ]] || [[ ! -d "$TOOLKIT_ROOT/config" ]]; then
  echo "ERROR: could not find root of overleaf-toolkit project (inferred project root as '$TOOLKIT_ROOT')"
  exit 1
fi

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

__main__ "$@"