#!/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"
# 		echo "TRUE"
# 	else
# 		mediainfo "$6"
# 		echo "FALSE"
# 	fi
# }

image() {
	if [ -n "$DISPLAY" ] && [ -z "$WAYLAND_DISPLAY" ]; 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"
		exit 1
	else
		chafa "$1" -s "$4x"
	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 -- "$1")" in
image/svg* | application/illustrator)
	CACHE="$XDG_CACHE_HOME/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" ] &&
		convert "$1" "$CACHE.jpg"
	image "$CACHE.jpg" "$2" "$3" "$4" "$5"
	;;
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/markdown) glow -s dark "$1" ;;
text/* | */xml | application/json) bat --style=plain --terminal-width "$(($4 - 2))" -f "$1" ;;
audio/* | application/octet-stream) mediainfo "$1" || exit 1 ;;
video/*)
	CACHE="$XDG_CACHE_HOME/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/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/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" ;;
application/pgp-encrypted) gpg -d -- "$1" ;;
application/x-bittorrent) transmission-show "$1" ;;
application/x-iso*) iso-info "$1" ;;
*msword) catdoc "$1" ;;
*openxmlformats-officedocument.wordprocessingml.document) docx2txt "$1" - ;;
*opendocument*) odt2txt "$1" ;;
*ms-excel | *openxmlformats-officedocument.spreadsheetml.sheet)
	ssconvert --export-type=Gnumeric_stf:stf_csv "$1" "fd://1" | bat --language=csv
	;;
esac
exit 1
