#!/bin/bash
# Reverses what InkyPi's install.sh did, based on reading that script
# directly (fatihak/InkyPi/install/install.sh). Run this ON the Pi, as root.
#
# Paperwall is fully standalone -- it vendors its own copy of the Waveshare
# driver files and has its own venv, so it doesn't need InkyPi installed at
# all. This script is purely optional cleanup for whenever you're done with
# InkyPi as a fallback.
#
# Deliberately leaves alone:
#   - SPI/I2C being enabled in /boot/firmware/config.txt -- Paperwall
#     needs those same interfaces for the same panel. Disabling them
#     would break it too.
#   - zramswap / earlyoom services -- these are general Pi memory-management
#     helpers install.sh set up (Bookworm zramswap + earlyoom), not InkyPi
#     app state. Generically useful to keep running. Uncomment below if you
#     really want them gone.
#   - The git clone at ~/InkyPi -- not needed by Paperwall for anything, just
#     left in place in case you want InkyPi back someday. Delete manually or
#     pass --purge-clone.
#
# Usage: sudo bash uninstall_inkypi.sh [--purge-clone]

set -euo pipefail

if [ "$EUID" -ne 0 ]; then
  echo "Run as root (sudo bash uninstall_inkypi.sh)" >&2
  exit 1
fi

echo "==> Stopping and disabling inkypi.service"
systemctl disable --now inkypi.service 2>/dev/null || echo "  (not running/installed, skipping)"

echo "==> Removing systemd unit"
rm -f /etc/systemd/system/inkypi.service
systemctl daemon-reload

echo "==> Removing installed app (/usr/local/inkypi, includes venv_inkypi)"
rm -rf /usr/local/inkypi

echo "==> Removing CLI executable (/usr/local/bin/inkypi)"
rm -f /usr/local/bin/inkypi

if [[ "${1:-}" == "--purge-clone" ]]; then
  echo "==> Removing git clone at ~/InkyPi (--purge-clone was passed)"
  echo "    NOTE: this also deletes src/config/device.json, which has your"
  echo "    old Navidrome credentials in plaintext -- fine if that's the point."
  rm -rf ~/InkyPi
else
  echo "==> Leaving ~/InkyPi in place (not needed by Paperwall, just kept as a fallback)."
  echo "    Re-run with --purge-clone to remove it too."
  echo "    NOTE: ~/InkyPi/src/config/device.json still has your old Navidrome"
  echo "    credentials in plaintext if you want to wipe just that file instead."
fi

cat <<'MSG'

==> InkyPi app removed. Left untouched on purpose:
    - SPI/I2C interfaces in /boot/firmware/config.txt (Paperwall needs them)
    - zramswap / earlyoom services (general Pi memory helpers, not InkyPi-specific)

    To also remove those memory-management services:
        sudo systemctl disable --now zramswap
        sudo apt remove -y zram-tools
        sudo systemctl disable --now earlyoom
        sudo apt remove -y earlyoom
MSG