#!/usr/bin/env bash
# BackTunnel uninstaller (with optional PURGE=1 to remove shared defaults)
set -euo pipefail

PREFIX=${PREFIX:-/usr}
DESTDIR=${DESTDIR:-}
PURGE=${PURGE:-0}   # set PURGE=1 to remove /usr/share/backtunnel and /etc/backtunnel

BINDIR="$DESTDIR$PREFIX/bin"
MANDIR="$DESTDIR$PREFIX/share/man/man1"
KIO_SM="$DESTDIR$PREFIX/share/kio/servicemenus"
KSVC5="$DESTDIR$PREFIX/share/kservices5/ServiceMenus"
APPDIR="$DESTDIR$PREFIX/share/applications"
BCOMP="$DESTDIR$PREFIX/share/bash-completion/completions"
SHARE_DIR="$DESTDIR$PREFIX/share/backtunnel"
ETC_DIR="$DESTDIR/etc/backtunnel"

say() { printf '[BackTunnel] %s\n' "$*"; }
say_warn() { printf '[BackTunnel] WARN: %s\n' "$*" >&2; }

# Portable directory prune: remove dir if empty, then move up until stop boundary
prune_dir() {
  local dir="${1%/}"
  local stop="${2%/}"
  while [[ -n "$dir" && "$dir" != "/" && "$dir" != "$stop" ]]; do
    rmdir "$dir" 2>/dev/null || break
    dir="$(dirname "$dir")"
  done
}

# Friendly notice if uninstalling the live system without root
if [[ -z "$DESTDIR" && ${EUID:-$(id -u)} -ne 0 ]]; then
  say_warn "Running without root; some files may not be removed due to permissions."
fi

say "Uninstalling from PREFIX=${PREFIX} DESTDIR=${DESTDIR} (PURGE=${PURGE})"

# --- Remove binaries ---
rm -f "$BINDIR/backtunnel-share" \
      "$BINDIR/backtunnel-access" \
      "$BINDIR/backtunnel-auth-setup" \
      "$BINDIR/backtunnel-share-gui" \
      "$BINDIR/backtunnel-access-gui" \
      "$BINDIR/backtunnel-open-term" \
      "$BINDIR/backtunnel-share-tui" \
      "$BINDIR/backtunnel-access-tui"
# Optionally remove helper that may be present on some installs
rm -f "$BINDIR/backtunnel-init"

# --- Man page ---
rm -f "$MANDIR/backtunnel.1"

# --- Bash completions ---
rm -f "$BCOMP/backtunnel-share" \
      "$BCOMP/backtunnel-access"

# --- Dolphin service menus (Plasma 6 + legacy) ---
rm -f "$KIO_SM/backtunnel_share.desktop" \
      "$KIO_SM/backtunnel_access.desktop" \
      "$KSVC5/backtunnel_share.desktop" \
      "$KSVC5/backtunnel_access.desktop"

# --- Optional desktop launcher ---
rm -f "$APPDIR/backtunnel.desktop"

# --- Shared defaults (only if PURGE=1) ---
if [[ "$PURGE" = "1" ]]; then
  say "Purging shared defaults under $SHARE_DIR and $ETC_DIR"
  rm -f "$SHARE_DIR/profiles.ini" 2>/dev/null || true
  rm -f "$ETC_DIR/profiles.ini"   2>/dev/null || true
  # Remove directories if empty (and prune empty parents up to safe boundaries)
  prune_dir "$SHARE_DIR" "$DESTDIR$PREFIX/share"
  prune_dir "$ETC_DIR"   "$DESTDIR/etc"
else
  # Optionally clean up empty share dir if package manager removed files already
  prune_dir "$SHARE_DIR" "$DESTDIR$PREFIX/share"
  say "Keeping shared defaults: $SHARE_DIR/ and $ETC_DIR/ (set PURGE=1 to remove)"
fi

# --- Refresh desktop/KDE cache (best-effort, skip during packaging) ---
if [[ -z "$DESTDIR" ]]; then
  if command -v update-desktop-database >/dev/null 2>&1; then
    update-desktop-database -q || true
  fi
  if command -v kbuildsycoca6 >/dev/null 2>&1; then
    kbuildsycoca6 --noincremental >/dev/null 2>&1 || true
  elif command -v kbuildsycoca5 >/dev/null 2>&1; then
    kbuildsycoca5 --noincremental >/dev/null 2>&1 || true
  fi
fi

say "Uninstall complete."