#!/bin/sh

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

PREVIEW_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/lf"
PREVIEW_WIDTH=600 # px

chafafunc() {
  chafa -f sixel -O 0 --polite on -c full -w 9 -t 0.8 --view-size "$1"x"$2" --animate false --fg-only
}

# Prevent recursive thumbnails (if the file ends in .six)
[ "${1##*.}" = "six" ] && cat "$1" && exit 1

case "$(file --dereference --brief --mime-type -- "$1")" in
text/html)
  lynx -width="$4" -display_charset=utf-8 -dump "$1"
  ;;
text/troff)
  w=`expr "$2" - 2`
  MANWIDTH="$w" man ./ "$1"
  ;;
text/* | */xml)
  [ "${1##*.}" = "md" ] && glow -s dark -w "$2" "$1" && exit 0
  bat --terminal-width "$(($4 - 2))" -f "$1"
  ;;
application/json | application/x-ndjson)
  jq -C < "$1" ;;
audio/* | application/octet-stream)
  mediainfo "$1" || exit 1
  ;;
font/* | application/vnd.ms-opentype)
  FONT_NAME=$(fc-query --format "%{family}\n" "$1" | head -n 1)

  PREVIEW_TEXT="${FONT_NAME}\nABCDEFGHIJKLMNOPQRSTUBWXYZ\n""\
abcdefghijklmnopqrstuvwxyz\n""\
1234567890\n""\
!@#$\%(){}[]-+=_\`~"

  convert -size "1920x1080" xc:'#ffffff' \
    -gravity center -pointsize 76 \
    -font "$1" \
    -fill '#000000' \
    -annotate +0+0 "$PREVIEW_TEXT" \
    -flatten jpeg:- | chafafunc $2 $3
  ;;

image/vnd.djvu)
  djvused "$1" -e 'select 1; save-page-with /dev/stdout' |
      convert djvu:- jpeg:- | chafafunc $2 $3
  ;;
image/webp)
  dwebp "$1" -tiff -o - | chafafunc $2 $3
  ;;
image/heic)
  convert "$1" jpeg:- | chafafunc $2 $3
  ;;
image/*)
  cat "$1" | chafafunc $2 $3
  ;;
*/pdf)
  pdftocairo -singlefile -scale-to-x $PREVIEW_WIDTH -scale-to-y -1 -jpeg "$1" - | chafafunc $2 $3
  ;;
video/*)
  ffmpegthumbnailer -i "$1" -s 0 -c jpeg -f -o - | chafafunc $2 $3
  ;;
application/*zip)
  atool --list -- "$1"
  ;;
*spreadsheetml.sheet)
  xlsx2csv -s 1 "$1" | bat --terminal-width "$(($4 - 2))" -l 'csv'
  ;;
*opendocument*)
  odt2txt "$1"
  ;;
application/pgp-encrypted)
  gpg -d -- "$1"
  ;;
esac

exit 1