#!/usr/bin/env bash
# rice-preview <file> - show a file in the terminal. Pictures and video frames
# are drawn as real images (kitty's protocol in kitty, sixel in st), folders as
# a tree, and everything else through bat. Used by `ff` (fzf) and `img`.
set -uo pipefail

file="${1:?usage: rice-preview <file>}"
[[ -e $file ]] || exit 0

cols="${FZF_PREVIEW_COLUMNS:-$(tput cols)}"
lines="${FZF_PREVIEW_LINES:-$(( $(tput lines) - 2 ))}"
cache="${XDG_CACHE_HOME:-$HOME/.cache}/rice/preview"

picture() {
  if [[ -n ${KITTY_WINDOW_ID:-} ]]; then
    kitty +kitten icat --clear --transfer-mode=memory --stdin=no --place="${cols}x${lines}@0x0" -- "$1"
  elif [[ $TERM == st* ]]; then
    chafa --format sixel --size "${cols}x${lines}" -- "$1"
  else
    chafa --format symbols --size "${cols}x${lines}" -- "$1"
  fi
}

if [[ -d $file ]]; then
  eza --tree --level=2 --icons=always --color=always -- "$file" 2>/dev/null || ls -la -- "$file"
  exit 0
fi

case "$(file -b --mime-type -- "$file")" in
  image/*)
    picture "$file"
    ;;
  video/*)
    mkdir -p "$cache"
    frame="$cache/$(printf '%s:%s' "$(realpath -- "$file")" "$(stat -c %Y -- "$file")" | sha1sum | cut -c1-16).jpg"
    [[ -s $frame ]] || ffmpeg -loglevel error -y -ss 3 -i "$file" -frames:v 1 -vf scale=640:-1 "$frame" 2>/dev/null
    [[ -s $frame ]] && picture "$frame"
    ;;
  *)
    bat --style=numbers --color=always --line-range :300 -- "$file" 2>/dev/null || head -n 300 -- "$file"
    ;;
esac