"""PiCopy – Blueprint: /api/sysinfo, /api/update/*, /api/format/*, /api/system/*."""

import subprocess
import threading

from flask import Blueprint, jsonify, request

from picopy.usb import usb_devices
from picopy.state import copy_state
from picopy.system import (
    get_sysinfo, update_state, update_lock,
    format_state, FORMAT_FILESYSTEMS,
    check_for_updates, install_update, do_format,
)

system_bp = Blueprint('system', __name__)


@system_bp.route('/api/sysinfo')
def r_sysinfo():
    return jsonify(get_sysinfo())


@system_bp.route('/api/update/status')
def r_update_status():
    with update_lock:
        return jsonify(dict(update_state))


@system_bp.route('/api/update/check', methods=['POST'])
def r_update_check():
    threading.Thread(target=check_for_updates, daemon=True).start()
    return jsonify(ok=True)


@system_bp.route('/api/update/install', methods=['POST'])
def r_update_install():
    from picopy.config import log
    try:
        install_update()
        return jsonify(ok=True)
    except SyntaxError as e:
        return jsonify(error=f'Update-Datei ungültig: {e}'), 500
    except Exception as e:
        log.exception('Update fehlgeschlagen')
        return jsonify(error=str(e)), 500


@system_bp.route('/api/format/status')
def r_format_status():
    return jsonify(dict(format_state))


@system_bp.route('/api/format', methods=['POST'])
def r_format():
    if format_state['running']:
        return jsonify(error='Formatierung läuft bereits'), 409
    if copy_state.get('running'):
        return jsonify(error='Kopiervorgang läuft – bitte warten'), 409

    body  = request.get_json(force=True)
    fs    = body.get('fs', '').lower()
    name  = (body.get('name') or 'PICOPY').upper()
    dev   = body.get('device', '')

    if fs not in FORMAT_FILESYSTEMS:
        return jsonify(error=f'Unbekanntes Dateisystem: {fs}'), 400
    if not dev.startswith('/dev/'):
        return jsonify(error='Ungültiges Gerät'), 400

    # Sicherheitscheck: Gerät muss ein bekanntes USB-Gerät sein
    known = [d['device'] for d in usb_devices()]
    if dev not in known:
        return jsonify(error='Gerät nicht als USB-Laufwerk erkannt'), 400

    threading.Thread(target=do_format, args=(fs, name, dev), daemon=True).start()
    return jsonify(ok=True)


@system_bp.route('/api/system/reboot', methods=['POST'])
def r_system_reboot():
    threading.Thread(target=lambda: (
        __import__('time').sleep(1),
        subprocess.Popen(['reboot'])
    ), daemon=True).start()
    return jsonify(ok=True)