#!/usr/bin/env bash
# Generated by the FEDEO setup wizard. This file contains the agent's access token.
set -euo pipefail
umask 077

if [[ "$(uname -s)" != Linux ]]; then
  echo 'Diese Installation ist für Linux vorgesehen.' >&2
  exit 1
fi
if [[ "$(id -u)" == 0 ]]; then
  echo 'Bitte dieses Skript als normaler Benutzer ohne sudo starten.' >&2
  exit 1
fi
if [[ "${1:-}" != '' && "${1:-}" != --no-start ]]; then
  echo 'Aufruf: bash install.sh [--no-start]' >&2
  exit 1
fi

FEDEO_SETUP_ID='@@AGENT_ID@@'
FEDEO_SETUP_AUTOSTART='@@AUTOSTART@@'
FEDEO_SETUP_DIR="${XDG_DATA_HOME:-$HOME/.local/share}/fedeo-device-agent/$FEDEO_SETUP_ID"
FEDEO_SETUP_CONFIG="${XDG_CONFIG_HOME:-$HOME/.config}/fedeo-device-agent/$FEDEO_SETUP_ID.env"
FEDEO_SETUP_WORK="${XDG_STATE_HOME:-$HOME/.local/state}/fedeo-device-agent/$FEDEO_SETUP_ID"
FEDEO_SETUP_UNIT="fedeo-device-agent-$FEDEO_SETUP_ID.service"
FEDEO_SETUP_UNITS="${XDG_CONFIG_HOME:-$HOME/.config}/systemd/user"

echo 'FEDEO Scan-Agent wird für diesen Benutzer eingerichtet.'
fedeo_processing_ready() {
  python3 -c 'import PIL, cv2, numpy' >/dev/null 2>&1 &&
    tesseract --list-langs 2>/dev/null | grep -qx deu &&
    tesseract --list-langs 2>/dev/null | grep -qx eng
}
if ! command -v node >/dev/null || ! command -v scanimage >/dev/null || ! fedeo_processing_ready; then
  if ! command -v apt-get >/dev/null; then
    echo 'Bitte Node.js >= 20, SANE, Python/Pillow/OpenCV sowie Tesseract mit Deutsch/Englisch installieren und das Skript erneut starten.' >&2
    exit 1
  fi
  echo 'Fehlende Systempakete werden über apt installiert (sudo benötigt).'
  sudo apt-get update
  sudo apt-get install -y nodejs sane-utils python3-pil python3-opencv tesseract-ocr tesseract-ocr-deu tesseract-ocr-eng
fi
node -e 'if (Number(process.versions.node.split(".")[0]) < 20) { console.error("Node.js >= 20 wird benötigt. Bitte Node.js aktualisieren und die Installation erneut starten."); process.exit(1) }'
fedeo_processing_ready || { echo 'Die benötigte Bildverarbeitung oder die OCR-Sprachpakete fehlen weiterhin.' >&2; exit 1; }

FEDEO_SETUP_NODE="$(command -v node)"
FEDEO_SETUP_HAS_SYSTEMD=false
if command -v systemctl >/dev/null && systemctl --user show-environment >/dev/null 2>&1; then
  FEDEO_SETUP_HAS_SYSTEMD=true
fi
if [[ "$FEDEO_SETUP_AUTOSTART" == true && "$FEDEO_SETUP_HAS_SYSTEMD" != true ]]; then
  echo 'Der Benutzerdienst von systemd ist nicht erreichbar. Bitte in der Desktop-Sitzung starten oder den Autostart im Assistenten ausschalten.' >&2
  exit 1
fi

mkdir -p "$FEDEO_SETUP_DIR" "$(dirname "$FEDEO_SETUP_CONFIG")" "$FEDEO_SETUP_WORK" "$FEDEO_SETUP_UNITS"
# Stop only the matching installation before replacing its files.
if [[ "$FEDEO_SETUP_HAS_SYSTEMD" == true && "${1:-}" != --no-start ]]; then
  systemctl --user stop "$FEDEO_SETUP_UNIT" 2>/dev/null || true
fi

python3 - "$FEDEO_SETUP_DIR" "$FEDEO_SETUP_CONFIG" "$FEDEO_SETUP_WORK" "$FEDEO_SETUP_NODE" "$FEDEO_SETUP_UNITS/$FEDEO_SETUP_UNIT" <<'FEDEO_PYTHON'
import base64
import json
import os
from pathlib import Path
import sys

agent_dir, config_path, work_dir, node, unit_path = map(Path, sys.argv[1:])
files = json.loads(base64.b64decode('@@PAYLOAD_BASE64@@'))
for name, encoded in files.items():
    relative = Path(name)
    if relative.is_absolute() or '..' in relative.parts:
        raise ValueError('Ungültiger Dateiname im Installationspaket')
    target = agent_dir / relative
    target.parent.mkdir(parents=True, exist_ok=True)
    target.write_bytes(base64.b64decode(encoded, validate=True))

config = base64.b64decode('@@CONFIG_BASE64@@').decode('utf8')
config += 'FEDEO_WORK_DIR=' + str(work_dir) + '\n'
config_path.write_text(config, encoding='utf8')
config_path.chmod(0o600)

def unit_quote(value):
    return '"' + str(value).replace('\\', '\\\\').replace('"', '\\"').replace('%', '%%') + '"'

unit_path.write_text('\n'.join([
    '[Unit]', 'Description=FEDEO Scan-Agent', 'After=network-online.target', '',
    '[Service]', 'Type=simple',
    # WorkingDirectory takes a literal path, unlike Environment/ExecStart.
    # Quotes would become part of the path; only systemd specifiers need escaping.
    'WorkingDirectory=' + str(agent_dir).replace('%', '%%'),
    'Environment=' + unit_quote('FEDEO_AGENT_ENV=' + str(config_path)),
    'ExecStart=' + unit_quote(node) + ' ' + unit_quote(agent_dir / 'dist/main.js'),
    'Restart=on-failure', 'RestartSec=5', 'UMask=0077', '',
    '[Install]', 'WantedBy=default.target', '',
]), encoding='utf8')
FEDEO_PYTHON

echo "Agent installiert: $FEDEO_SETUP_DIR"
echo "Konfiguration: $FEDEO_SETUP_CONFIG"
if [[ "${1:-}" == --no-start ]]; then
  echo 'Installation abgeschlossen; Agent wurde nicht gestartet.'
elif [[ "$FEDEO_SETUP_AUTOSTART" == true ]]; then
  systemctl --user daemon-reload
  systemctl --user enable "$FEDEO_SETUP_UNIT"
  systemctl --user restart "$FEDEO_SETUP_UNIT"
  echo 'Agent gestartet. Er startet künftig bei der Anmeldung.'
  printf 'Protokoll: journalctl --user -u %q -f\n' "$FEDEO_SETUP_UNIT"
  echo 'Jetzt im FEDEO-Assistenten die Verbindung prüfen. Die heruntergeladene Installationsdatei kann anschließend gelöscht werden.'
else
  if [[ "$FEDEO_SETUP_HAS_SYSTEMD" == true ]]; then
    systemctl --user disable "$FEDEO_SETUP_UNIT" 2>/dev/null || true
    systemctl --user daemon-reload
  fi
  echo 'Agent startet im Terminal. Dieses Fenster geöffnet lassen; Beenden mit Strg+C.'
  cd "$FEDEO_SETUP_DIR"
  FEDEO_AGENT_ENV="$FEDEO_SETUP_CONFIG" "$FEDEO_SETUP_NODE" dist/main.js
fi