#!/bin/sh

path="$(dirname "$(readlink -f "$0")")"
backupDir="$HOME/.config/config-backup/$(date +%Y%m%d-%H%M%S)"
backupDirCreated=0

sources=""
if [ -z "$1" ]; then
    sources=$(find "$path/../config/" -maxdepth 1 -not -path "$path/../config")
else
    for arg in "$@"; do
        src="$path/../config/$arg"
        if [ ! -e "$src" ]; then
            echo "Error: Config '$arg' does not exist." >&2
            exit 1
        fi
        sources="$sources $path/../config/$arg"
    done
fi

for src in $sources; do
    name="$(basename "$src")"
    dest="$HOME/.config/$name"

    if [ -e "$dest" ] || [ -L "$dest" ]; then
        [ "$backupDirCreated" -eq 0 ] && {
            mkdir -pv "$backupDir"
            backupDirCreated=1
        }
        mv -vf "$dest" "$backupDir/"
    fi

    ln -sv "$(realpath --relative-to="$HOME/.config" "$src")" "$dest"
done