#!/bin/sh

# File preview handler for lf.

set -C -f
IFS="$(printf '%b_' '\n')"; IFS="${IFS%_}"

image() {
	if [ -f "$1" ] && [ -n "$DISPLAY" ] && [ -z "$WAYLAND_DISPLAY" ] && command -V ueberzug >/dev/null 2>&1; then
		printf '{"action": "add", "identifier": "PREVIEW", "x": "%s", "y": "%s", "width": "%s", "height": "%s", "scaler": "contain", "path": "%s"}\n' "$4" "$5" "$(($2-1))" "$(($3-1))" "$1" > "$FIFO_UEBERZUG"
	else
		mediainfo "$6"
	fi
}

# Note that the cache file name is a function of file information, meaning if
# an image appears in multiple places across the machine, it will not have to
# be regenerated once seen.

case "$(file --dereference --brief --mime-type -- "$1")" in
	image/avif) CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/lf/thumb.$(stat --printf '%n\0%i\0%F\0%s\0%W\0%Y' -- "$(readlink -f "$1")" | sha256sum | cut -d' ' -f1)"
		[ ! -f "$CACHE" ] && convert "$1" "$CACHE.jpg"
		image "$CACHE.jpg" "$2" "$3" "$4" "$5" "$1" ;;
	image/vnd.djvu)
		CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/lf/thumb.$(stat --printf '%n\0%i\0%F\0%s\0%W\0%Y' -- "$(readlink -f "$1")" | sha256sum | cut -d' ' -f1)"
		[ ! -f "$CACHE" ] && djvused "$1" -e 'select 1; save-page-with /dev/stdout' | convert -density 200 - "$CACHE.jpg" > /dev/null 2>&1
		image "$CACHE.jpg" "$2" "$3" "$4" "$5" "$1" ;;
image/svg+xml)
	CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/lf/thumb.$(stat --printf '%n\0%i\0%F\0%s\0%W\0%Y' -- "$(readlink -f "$1")" | sha256sum | cut -d' ' -f1)"
	[ ! -f "$CACHE" ] && inkscape --convert-dpi-method=none -o "$CACHE.png" --export-overwrite -D --export-png-color-mode=RGBA_16 "$1"
	image "$CACHE.png" "$2" "$3" "$4" "$5" "$1"
	;;
	image/*) image "$1" "$2" "$3" "$4" "$5" "$1" ;;
	text/html) lynx -width="$4" -display_charset=utf-8 -dump "$1" ;;
	text/troff) man ./ "$1" | col -b ;;
	text/* | */xml | application/json | application/x-ndjson) bat -p --theme ansi --terminal-width "$(($4-2))" -f "$1" ;;
	audio/* | application/octet-stream) mediainfo "$1" || exit 1 ;;
	video/* )
		CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/lf/thumb.$(stat --printf '%n\0%i\0%F\0%s\0%W\0%Y' -- "$(readlink -f "$1")" | sha256sum | cut -d' ' -f1)"
		[ ! -f "$CACHE" ] && ffmpegthumbnailer -i "$1" -o "$CACHE" -s 0
		image "$CACHE" "$2" "$3" "$4" "$5" "$1"
		;;
	*/pdf)
		CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/lf/thumb.$(stat --printf '%n\0%i\0%F\0%s\0%W\0%Y' -- "$(readlink -f "$1")" | sha256sum | cut -d' ' -f1)"
		[ ! -f "$CACHE.jpg" ] && pdftoppm -jpeg -f 1 -singlefile "$1" "$CACHE"
		image "$CACHE.jpg" "$2" "$3" "$4" "$5" "$1"
		;;
	*/epub+zip|*/mobi*)
		CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/lf/thumb.$(stat --printf '%n\0%i\0%F\0%s\0%W\0%Y' -- "$(readlink -f "$1")" | sha256sum | cut -d' ' -f1)"
		[ ! -f "$CACHE.jpg" ] && gnome-epub-thumbnailer "$1" "$CACHE.jpg"
		image "$CACHE.jpg" "$2" "$3" "$4" "$5" "$1"
		;;
	application/*zip) atool --list -- "$1" ;;
	*opendocument*) odt2txt "$1" ;;
	application/pgp-encrypted) gpg -d -- "$1" ;;
esac
exit 1
