#!/bin/sh

INTERVAL="$1"
WALLPAPER_DIR="$2"

rm -rf ~/.cache/swww/
swww kill

swww init
interval_secs="$(echo "60 * ${INTERVAL}" | bc)"

while true; do
    wallpaper="$(fd '\.(png|jpe?g|gif)$' "$WALLPAPER_DIR" --type f --type l -L | shuf | head -1)"
    if [ -z "$wallpaper" ]; then
        echo "Couldn't find any wallpapers. Abort" >&2
        exit 1
    fi
    ln -sf "$wallpaper" "/run/user/$(id -u)/.current-wallpaper"
    swww img "$wallpaper"
    sleep "$interval_secs"
done