#!/bin/bash
# set -x

VOLDIR=/svc
REAL_FILE="$(realpath --canonicalize-existing --no-symlinks -- "$1")"

case "$REAL_FILE" in
         "" ) echo -- "$1 : no such file"; exit ;;
   "/var/"* ) echo "/var is not tracked!"; exit ;;
  "/home/"* ) SUBVcont="@home"
              [[ -r "$VOLDIR/$SUBVcont" ]] || sudo chmod 755 -- "$VOLDIR/$SUBVcont" ;;
          * ) [ "$EUID" -eq 0            ] || exec sudo      -- "$0" "$@"
              SUBVcont="@rwroot";;
esac

OLD="$(stat --format=%n -- "$VOLDIR/$SUBVcont"/*/"${REAL_FILE#/home/}" \
| sed "s#$VOLDIR/$SUBVcont/##"           \
| sort --reverse                         \
| fzf                                    \
       --header=" $(date +%F_%H-%M) $0
$(stat "$REAL_FILE")"                    \
       --header-first                    \
       --info=inline-right               \
       --scroll-off=5                    \
       --no-separator                    \
       --prompt=" "                      \
       --pointer=" "                     \
       --layout=reverse                  \
       --color='fg:#bbbbbb,bg+:#ffc9a9,fg+:#8f5999,hl+:#ff497c,gutter:-1' \
       --preview-window=right,63%,border-none \
       --preview="echo
       stat -- \"$VOLDIR/$SUBVcont\"/{} | grep --color=always --extended-regexp 'File: .*|symbolic link$|^'
       echo
       diff --report-identical-files --color=always -- \"$REAL_FILE\" \"$VOLDIR/$SUBVcont\"/{}" \
       )"

[[ -z "$OLD" ]] && { echo "no version selected"; exit; }
OLD="$VOLDIR/$SUBVcont/$OLD"
wl-copy --primary <<< "$OLD"
wl-copy           <<< "$OLD"

operation="$(fzf   \
    --color='fg:#bbbbbb,bg+:#ffc9a9,fg+:#8f5999,hl+:#ff497c,gutter:-1' \
    --info=hidden  \
    --scroll-off=5 \
    --prompt=" "   \
    --pointer=" "  \
    --header="$0
$OLD"              \
      <<<          \
'🗿 show
👓 diff
✅ Done')"
# ⏳ restore


case "${operation:-"✅ Done"}" in
  *" show"    ) thunar    "${OLD%/*}"        ;;
  *" diff"    ) nvim -d   "$OLD" "$REAL_FILE";;
  *" Done"    ) echo      "$OLD";       exit ;;
esac