#!/bin/bash

# Generates thumbs

if [[ "$1" != "" ]]; then
	if [[ -L "$1" ]]; then
		exit
	fi

	src="$1"
	base=$(basename -- "$src")
	dst=".thumbs/$base"

	if [[ "$src" -nt "$dst" ]]; then
		echo "update $dst"

		if [[ "$src" == *.mp4 ]] || [[ "$src" == *.gif ]]; then
			dst_tmp="/tmp/$base.png"
			rm -f "$dst_tmp"

			ffmpeg -hide_banner -loglevel error -i "$src" -ss 00:00:00.000 -vframes 1 "$dst_tmp"
			src="$dst_tmp"

			dst_tmp="/tmp/$base"
			mv "$src" "$dst_tmp"
			src="$dst_tmp"
		fi

		mogrify -path .thumbs/ -auto-orient -thumbnail 128x128 -quality 90% "$src"

		rm -f "$dst_tmp"
	fi
else
	mkdir -p .thumbs
	find -type f -not -path "./.thumbs/*" \
		| grep -iE "\.png$|\.jpg$|\.jpeg$|\.jfif$|\.gif$|\.webp$|\.mp4$" \
		| parallel -j$(nproc) "$0" {}
fi