#!/bin/bash
set -euo pipefail
cd "$(dirname "$0")"
NO_START=0
IMPORT=''
INTEGRATION=''
while [ "$#" -gt 0 ]; do
  case "$1" in
    --enable-integration) INTEGRATION=true; shift ;;
    --disable-integration) INTEGRATION=false; shift ;;
    --no-start) NO_START=1; shift ;;
    --import-monitor-config) [ "$#" -ge 2 ] || exit 2; IMPORT="$2"; shift 2 ;;
    -h|--help) echo 'Usage: sudo ./install.sh [--no-start] [--enable-integration|--disable-integration] [--import-monitor-config /etc/pigway-pi-control.conf]'; exit 0 ;;
    *) echo "ERROR: unknown option: $1" >&2; exit 2 ;;
  esac
done
for f in app/local_state.py app/migrate.py app/service.py app/runtime.py app/settings.py app/drivers/yahboom.py app/oled_font_5x7.bin config/pigway-cooling-hat.conf systemd/pigway-cooling-hat.service; do
  [ -f "$f" ] || { echo "ERROR: required file missing: $f" >&2; exit 1; }
done
[ "$(id -u)" -eq 0 ] || { echo 'ERROR: run as root' >&2; exit 1; }
[ -e /dev/i2c-1 ] || { echo 'ERROR: /dev/i2c-1 missing; configure I2C before installing this driver' >&2; exit 1; }
# Never stop unrelated I2C users. A previous plugin instance is allowed on upgrade.
owner="$(systemctl show -p MainPID --value pigway-cooling-hat.service 2>/dev/null || true)"
for pid in $(fuser /dev/i2c-1 2>/dev/null || true); do
  [ "$pid" = "$owner" ] || { echo "ERROR: I2C already owned by PID $pid" >&2; exit 1; }
done
python3 -c 'import smbus2, PIL' 2>/dev/null || { apt-get update; apt-get install -y python3 python3-smbus2 python3-pil; }
# Validate a possible migration before changing installed files.
if [ -n "$IMPORT" ]; then PYTHONDONTWRITEBYTECODE=1 python3 app/migrate.py "$IMPORT" --check; fi
if [ -z "$INTEGRATION" ]; then
  INTEGRATION=false
  if [ -t 0 ]; then
    read -r -p 'Allow local monitor integration? [y/N] ' answer
    case "$answer" in y|Y|yes|YES) INTEGRATION=true ;; esac
  fi
fi
getent group pigway-hardware >/dev/null || groupadd --system pigway-hardware
mkdir -p /usr/local/lib/pigway-cooling-hat/drivers
install -m 0644 app/*.py app/oled_font_5x7.bin /usr/local/lib/pigway-cooling-hat/
install -m 0644 app/drivers/*.py /usr/local/lib/pigway-cooling-hat/drivers/
if [ ! -f /etc/pigway-cooling-hat.conf ]; then
  install -m 0640 -g pigway-hardware config/pigway-cooling-hat.conf /etc/pigway-cooling-hat.conf
fi
if [ -n "$IMPORT" ]; then
  cp /etc/pigway-cooling-hat.conf "/etc/pigway-cooling-hat.conf.bak.$(date +%Y%m%d-%H%M%S)"
  PYTHONDONTWRITEBYTECODE=1 python3 app/migrate.py "$IMPORT" --output /etc/pigway-cooling-hat.conf
fi
INTEGRATION="$INTEGRATION" PYTHONDONTWRITEBYTECODE=1 python3 - <<'PYCFG'
import os,sys
from pathlib import Path
sys.path.insert(0,'app')
from settings import load,save
p=Path('/etc/pigway-cooling-hat.conf');c=load(p);c['integration']['enabled']=os.environ['INTEGRATION'];save(p,c)
PYCFG
install -m 0644 systemd/pigway-cooling-hat.service /etc/systemd/system/
systemctl daemon-reload
if [ "$NO_START" -eq 0 ]; then
  systemctl enable pigway-cooling-hat.service >/dev/null
  systemctl restart pigway-cooling-hat.service
  systemctl is-active --quiet pigway-cooling-hat.service
fi
echo 'Hardware plugin installed independently. No monitor service was changed.'
echo 'Start if needed: sudo systemctl start pigway-cooling-hat.service'
echo 'Discover and connect from the monitor Web hardware plugins page.'