"""
Auth Routes
============

Authentication routes: login, logout, register, password reset, email verification, 2FA.
"""

import os
import re
import logging
import secrets
from datetime import datetime, timedelta

from flask import render_template, request, redirect, url_for, flash, session, current_app
from flask_login import login_required, login_user, logout_user, current_user
from werkzeug.security import generate_password_hash, check_password_hash

from . import bp
from database import SessionLocal, User, Company, UserBlock, UserCompany, SystemRole
from utils.helpers import sanitize_input, validate_email, validate_password
from extensions import limiter
from security_service import log_audit

# Logger
logger = logging.getLogger(__name__)

# Security logger (same name as in app.py for fail2ban integration)
security_logger = logging.getLogger('security')

# Security service availability check
try:
    from security_service import (
        generate_totp_secret, get_totp_uri, verify_totp,
        generate_backup_codes, verify_backup_code, log_audit
    )
    SECURITY_SERVICE_AVAILABLE = True
except ImportError:
    SECURITY_SERVICE_AVAILABLE = False
    logger.warning("Security service not available in auth blueprint")


def _auto_link_person(db, user):
    """Auto-link User to Person record by name match (if not already linked)."""
    if user.person_id or not user.name:
        return
    try:
        from database import Person
        name_parts = user.name.strip().split()
        if len(name_parts) < 2:
            return
        # Try exact match: first name + last name (case-insensitive)
        first_name = name_parts[0].upper()
        last_name = name_parts[-1].upper()
        from sqlalchemy import func
        person = db.query(Person).filter(
            func.upper(Person.nazwisko) == last_name,
            func.upper(Person.imiona).like(f'{first_name}%'),
        ).first()
        if person:
            user.person_id = person.id
            logger.info(f"Auto-linked user {user.id} ({user.name}) to person {person.id}")
    except Exception as e:
        logger.error(f"Auto-link person failed for user {user.id}: {e}")


def _send_registration_notification(user_info):
    """Send email notification when a new user registers"""
    try:
        from email_service import send_email, is_configured

        if not is_configured():
            logger.warning("Email service not configured - skipping registration notification")
            return

        notify_email = os.getenv('ERROR_NOTIFY_EMAIL', 'maciej.pienczyn@inpi.pl')
        if not notify_email:
            return

        reg_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
        is_member = "TAK" if user_info.get('is_norda_member') else "NIE"
        company_name = user_info.get('company_name', 'Brak przypisanej firmy')

        subject = f"NordaBiz: Nowa rejestracja - {user_info.get('name', 'Nieznany')}"

        body_text = f"""NOWA REJESTRACJA NA NORDABIZNES.PL
{'='*50}

Czas: {reg_time}
Imie: {user_info.get('name', 'N/A')}
Email: {user_info.get('email', 'N/A')}
NIP: {user_info.get('company_nip', 'N/A')}
Firma: {company_name}
Czlonek NORDA: {is_member}

{'='*50}
"""

        send_email(
            to=[notify_email],
            subject=subject,
            body_text=body_text,
            email_type='registration_notification'
        )
        logger.info(f"Registration notification sent for {user_info.get('email')}")
    except Exception as e:
        logger.error(f"Failed to send registration notification: {e}")


# ============================================================
# REGISTRATION
# ============================================================

@bp.route('/register', methods=['GET', 'POST'])
@limiter.limit("50 per hour;200 per day")
def register():
    """User registration"""
    if current_user.is_authenticated:
        return redirect(url_for('index'))

    if request.method == 'POST':
        email = sanitize_input(request.form.get('email', ''), 255)
        password = request.form.get('password', '')
        name = sanitize_input(request.form.get('name', ''), 255)
        company_nip = sanitize_input(request.form.get('company_nip', ''), 10)

        # Validate email
        if not validate_email(email):
            flash('Nieprawidlowy format adresu email.', 'error')
            return render_template('auth/register.html')

        # Validate password
        password_valid, password_message = validate_password(password)
        if not password_valid:
            flash(password_message, 'error')
            return render_template('auth/register.html')

        # Validate required fields
        if not name or not email or not company_nip:
            flash('Imię, email i NIP firmy są wymagane.', 'error')
            return render_template('auth/register.html')

        # Validate full name (first + last name)
        if len(name.split()) < 2:
            flash('Podaj imię i nazwisko (np. Jan Kowalski).', 'error')
            return render_template('auth/register.html')

        # Validate NIP format and checksum
        if not re.match(r'^\d{10}$', company_nip):
            flash('NIP musi skladac sie z 10 cyfr.', 'error')
            return render_template('auth/register.html')

        nip_weights = [6, 5, 7, 2, 3, 4, 5, 6, 7]
        nip_checksum = sum(int(company_nip[i]) * nip_weights[i] for i in range(9)) % 11
        if nip_checksum != int(company_nip[9]):
            flash('Nieprawidlowy NIP - blad sumy kontrolnej. Sprawdz poprawnosc numeru.', 'error')
            return render_template('auth/register.html')

        db = SessionLocal()
        try:
            # Check if user exists
            if db.query(User).filter_by(email=email).first():
                flash('Email juz jest zarejestrowany.', 'error')
                return render_template('auth/register.html')

            # Check if company is NORDA member
            is_norda_member = False
            company_id = None
            if company_nip and re.match(r'^\d{10}$', company_nip):
                company = db.query(Company).filter_by(nip=company_nip, status='active').first()
                if company:
                    is_norda_member = True
                    company_id = company.id

            # Generate verification token
            verification_token = secrets.token_urlsafe(32)
            verification_expires = datetime.now() + timedelta(hours=24)

            # Create user
            user = User(
                email=email,
                password_hash=generate_password_hash(password, method='pbkdf2:sha256'),
                name=name,
                company_nip=company_nip,
                company_id=company_id,
                company_role='NONE',
                is_norda_member=is_norda_member,
                created_at=datetime.now(),
                is_active=True,
                is_verified=False,
                verification_token=verification_token,
                verification_token_expires=verification_expires
            )

            db.add(user)
            db.flush()  # Get user.id before creating UserCompany

            # Create user_companies record if company matched
            if company_id:
                uc = UserCompany(user_id=user.id, company_id=company_id, role='NONE', is_primary=True)
                db.add(uc)

            db.commit()

            # Build verification URL
            base_url = os.getenv('APP_URL', 'https://nordabiznes.pl')
            verification_url = f"{base_url}/verify-email/{verification_token}"

            # Try to send verification email
            try:
                import email_service
                if email_service.is_configured():
                    success = email_service.send_welcome_email(email, name, verification_url)
                    if success:
                        logger.info(f"Verification email sent to {email}")
                    else:
                        logger.warning(f"Failed to send verification email to {email}")
                        logger.info(f"Verification token (email failed) for {email}: {verification_token[:8]}...")
                else:
                    logger.warning("Email service not configured")
                    logger.info(f"Verification token (no email) for {email}: {verification_token[:8]}...")
            except Exception as e:
                logger.error(f"Error sending verification email: {e}")
                logger.info(f"Verification token (exception) for {email}: {verification_token[:8]}...")

            logger.info(f"New user registered: {email}")

            # Send notification to admin about new registration
            try:
                company_name = company.name if company_id and company else None
                _send_registration_notification({
                    'name': name,
                    'email': email,
                    'company_nip': company_nip,
                    'company_name': company_name,
                    'is_norda_member': is_norda_member
                })
            except Exception as e:
                logger.error(f"Failed to send registration notification: {e}")

            # Store email in session for success page
            session['registered_email'] = email
            return redirect(url_for('auth.registration_success'))

        except Exception as e:
            logger.error(f"Registration error: {e}")
            flash('Wystapil blad podczas rejestracji. Sprobuj ponownie.', 'error')
            return render_template('auth/register.html')
        finally:
            db.close()

    return render_template('auth/register.html')


# ============================================================
# REGISTRATION SUCCESS
# ============================================================

@bp.route('/registration-success')
def registration_success():
    """Show registration success page with email verification instructions."""
    # Get email from session (set during registration)
    email = session.pop('registered_email', None)

    if not email:
        # No email in session - redirect to register
        return redirect(url_for('auth.register'))

    return render_template('auth/registration_success.html', email=email)


@bp.route('/check-verification-status')
def check_verification_status():
    """API endpoint to check if email has been verified (for polling from success page)."""
    from flask import jsonify

    email = request.args.get('email', '')
    if not email:
        return jsonify({'verified': False, 'error': 'No email provided'}), 400

    db = SessionLocal()
    try:
        user = db.query(User).filter(User.email == email).first()
        if not user:
            return jsonify({'verified': False, 'error': 'User not found'}), 404

        if user.is_verified:
            return jsonify({'verified': True, 'redirect': url_for('dashboard')})

        return jsonify({'verified': False})
    finally:
        db.close()


# ============================================================
# LOGIN
# ============================================================

@bp.route('/login', methods=['GET', 'POST'])
@limiter.limit("1000 per hour" if os.getenv('FLASK_ENV') == 'development' else "60 per minute;500 per hour")
def login():
    """User login"""
    if current_user.is_authenticated:
        return redirect(url_for('index'))

    if request.method == 'POST':
        email = sanitize_input(request.form.get('email', ''), 255)
        password = request.form.get('password', '')
        remember = request.form.get('remember', False) == 'on'

        # Basic validation
        if not email or not password:
            flash('Email i haslo sa wymagane.', 'error')
            return render_template('auth/login.html')

        db = SessionLocal()
        try:
            user = db.query(User).filter_by(email=email).first()

            # Get client IP for logging
            client_ip = request.headers.get('X-Forwarded-For', request.remote_addr)
            if client_ip and ',' in client_ip:
                client_ip = client_ip.split(',')[0].strip()

            # Check if account is locked
            if user and user.locked_until and user.locked_until > datetime.now():
                remaining = (user.locked_until - datetime.now()).seconds // 60 + 1
                security_logger.warning(f"LOCKED_ACCOUNT ip={client_ip} email={email}")
                flash(f'Konto tymczasowo zablokowane. Sprobuj za {remaining} minut.', 'error')
                return render_template('auth/login.html')

            if not user or not check_password_hash(user.password_hash, password):
                logger.warning(f"Failed login attempt for: {email}")
                security_logger.warning(f"FAILED_LOGIN ip={client_ip} email={email}")

                # Log failed login to audit
                log_audit(db, 'login_failed', 'user', entity_name=email,
                          details={'reason': 'invalid_credentials', 'ip': client_ip})
                db.commit()

                # Increment failed attempts if user exists
                if user:
                    user.failed_login_attempts = (user.failed_login_attempts or 0) + 1
                    # Lock account after 5 failed attempts (30 min lockout)
                    if user.failed_login_attempts >= 5:
                        user.locked_until = datetime.now() + timedelta(minutes=30)
                        security_logger.warning(f"ACCOUNT_LOCKED ip={client_ip} email={email} attempts={user.failed_login_attempts}")
                        db.commit()
                        flash('Zbyt wiele nieudanych prob. Konto zablokowane na 30 minut.', 'error')
                        return render_template('auth/login.html')
                    db.commit()

                flash('Nieprawidlowy email lub haslo.', 'error')
                return render_template('auth/login.html')

            if not user.is_active:
                flash('Konto zostalo dezaktywowane.', 'error')
                return render_template('auth/login.html')

            # Require email verification
            if not user.is_verified:
                flash('Musisz potwierdzic adres email przed zalogowaniem. Sprawdz skrzynke.', 'error')
                return render_template('auth/login.html')

            # Reset failed attempts on successful login
            user.failed_login_attempts = 0
            user.locked_until = None

            # Check if user has 2FA enabled
            if user.totp_enabled and SECURITY_SERVICE_AVAILABLE:
                # Store pending login in session for 2FA verification
                session['2fa_pending_user_id'] = user.id
                session['2fa_remember'] = remember
                next_page = request.args.get('next')
                if next_page and next_page.startswith('/'):
                    session['2fa_next'] = next_page
                db.commit()
                logger.info(f"2FA required for user: {email}")
                return redirect(url_for('auth.verify_2fa'))

            # No 2FA - login directly
            login_user(user, remember=remember)
            session['active_company_id'] = user.company_id
            user.last_login = datetime.now()
            user.login_count = (user.login_count or 0) + 1
            _auto_link_person(db, user)

            # Log successful login to audit
            log_audit(db, 'login', 'user', entity_id=user.id, entity_name=user.email,
                      details={'method': 'password', 'ip': client_ip})
            db.commit()

            logger.info(f"User logged in: {email}")

            next_page = request.args.get('next')
            # Prevent open redirect vulnerability
            if next_page and not next_page.startswith('/'):
                next_page = None

            return redirect(next_page or url_for('dashboard'))

        except Exception as e:
            logger.error(f"Login error: {e}")
            flash('Wystapil blad podczas logowania. Sprobuj ponownie.', 'error')
            return render_template('auth/login.html')
        finally:
            db.close()

    return render_template('auth/login.html')


# ============================================================
# LOGOUT
# ============================================================

@bp.route('/logout')
@login_required
def logout():
    """User logout"""
    # Log logout to audit
    db = SessionLocal()
    try:
        log_audit(db, 'logout', 'user', entity_id=current_user.id,
                  entity_name=current_user.email)
        db.commit()
    finally:
        db.close()

    # Clear 2FA session flag
    session.pop('2fa_verified', None)
    logout_user()
    flash('Wylogowano pomyslnie.', 'success')
    return redirect(url_for('index'))


# ============================================================
# TWO-FACTOR AUTHENTICATION
# ============================================================

@bp.route('/verify-2fa', methods=['GET', 'POST'])
@limiter.limit("10 per minute")
def verify_2fa():
    """Verify 2FA code during login"""
    # Check if there's a pending 2FA login
    pending_user_id = session.get('2fa_pending_user_id')
    if not pending_user_id:
        flash('Sesja wygasla. Zaloguj sie ponownie.', 'error')
        return redirect(url_for('login'))

    if request.method == 'POST':
        code = request.form.get('code', '').strip()
        use_backup = request.form.get('use_backup', False)

        if not code:
            flash('Wprowadz kod weryfikacyjny.', 'error')
            return render_template('auth/verify_2fa.html')

        db = SessionLocal()
        try:
            user = db.query(User).get(pending_user_id)
            if not user:
                session.pop('2fa_pending_user_id', None)
                flash('Uzytkownik nie istnieje.', 'error')
                return redirect(url_for('login'))

            # Verify code
            if SECURITY_SERVICE_AVAILABLE:
                if use_backup:
                    valid = verify_backup_code(user, code, db)
                else:
                    valid = verify_totp(user, code)
            else:
                valid = False

            if valid:
                # Clear pending login and log in
                session.pop('2fa_pending_user_id', None)
                remember = session.pop('2fa_remember', False)
                next_page = session.pop('2fa_next', None)

                login_user(user, remember=remember)
                session['active_company_id'] = user.company_id
                session['2fa_verified'] = True
                user.last_login = datetime.now()
                user.login_count = (user.login_count or 0) + 1
                _auto_link_person(db, user)

                # Log successful 2FA login to audit
                client_ip = request.headers.get('X-Forwarded-For', request.remote_addr)
                if client_ip and ',' in client_ip:
                    client_ip = client_ip.split(',')[0].strip()
                log_audit(db, 'login', 'user', entity_id=user.id, entity_name=user.email,
                          details={'method': '2fa', 'ip': client_ip})
                db.commit()

                logger.info(f"User logged in with 2FA: {user.email}")
                flash('Zalogowano pomyslnie.', 'success')

                return redirect(next_page or url_for('dashboard'))
            else:
                client_ip = request.headers.get('X-Forwarded-For', request.remote_addr)
                if client_ip and ',' in client_ip:
                    client_ip = client_ip.split(',')[0].strip()
                security_logger.warning(f"INVALID_2FA ip={client_ip} user_id={pending_user_id}")
                flash('Nieprawidlowy kod weryfikacyjny.', 'error')

        except Exception as e:
            logger.error(f"2FA verification error: {e}")
            flash('Wystapil blad. Sprobuj ponownie.', 'error')
        finally:
            db.close()

    return render_template('auth/verify_2fa.html')


@bp.route('/settings/2fa', methods=['GET', 'POST'])
@login_required
def settings_2fa():
    """2FA settings - enable/disable"""
    db = SessionLocal()
    try:
        user = db.query(User).get(current_user.id)

        if request.method == 'POST':
            action = request.form.get('action')

            if action == 'setup':
                # Generate new secret
                if SECURITY_SERVICE_AVAILABLE:
                    secret = generate_totp_secret()
                    if secret:
                        user.totp_secret = secret
                        user.totp_enabled = False  # Not enabled until verified
                        db.commit()
                        qr_uri = get_totp_uri(user)
                        return render_template('auth/2fa_setup.html',
                                               qr_uri=qr_uri,
                                               secret=secret)
                flash('Blad konfiguracji 2FA.', 'error')

            elif action == 'verify_setup':
                # Verify the setup code and enable 2FA
                code = request.form.get('code', '').strip()
                if SECURITY_SERVICE_AVAILABLE and verify_totp(user, code):
                    user.totp_enabled = True
                    # Generate backup codes
                    backup_codes = generate_backup_codes(8)
                    user.totp_backup_codes = backup_codes
                    db.commit()

                    # Log audit
                    if SECURITY_SERVICE_AVAILABLE:
                        log_audit(db, '2fa.enabled', 'user', user.id, user.email)
                        db.commit()

                    logger.info(f"2FA enabled for user: {user.email}")
                    return render_template('auth/2fa_backup_codes.html',
                                           backup_codes=backup_codes)
                else:
                    flash('Nieprawidlowy kod. Sprobuj ponownie.', 'error')
                    qr_uri = get_totp_uri(user)
                    return render_template('auth/2fa_setup.html',
                                           qr_uri=qr_uri,
                                           secret=user.totp_secret)

            elif action == 'disable':
                # Require current code to disable
                code = request.form.get('code', '').strip()
                if SECURITY_SERVICE_AVAILABLE and verify_totp(user, code):
                    user.totp_enabled = False
                    user.totp_secret = None
                    user.totp_backup_codes = None
                    db.commit()

                    # Log audit
                    if SECURITY_SERVICE_AVAILABLE:
                        log_audit(db, '2fa.disabled', 'user', user.id, user.email)
                        db.commit()

                    logger.info(f"2FA disabled for user: {user.email}")
                    flash('Uwierzytelnianie dwuskladnikowe zostalo wylaczone.', 'success')
                else:
                    flash('Nieprawidlowy kod. Nie mozna wylaczyc 2FA.', 'error')

            elif action == 'regenerate_backup':
                # Require current code to regenerate backup codes
                code = request.form.get('code', '').strip()
                if SECURITY_SERVICE_AVAILABLE and verify_totp(user, code):
                    backup_codes = generate_backup_codes(8)
                    user.totp_backup_codes = backup_codes
                    db.commit()

                    logger.info(f"Backup codes regenerated for user: {user.email}")
                    return render_template('auth/2fa_backup_codes.html',
                                           backup_codes=backup_codes)
                else:
                    flash('Nieprawidlowy kod. Nie mozna wygenerowac kodow.', 'error')

        return render_template('auth/2fa_settings.html',
                               totp_enabled=user.totp_enabled,
                               backup_codes_count=len(user.totp_backup_codes) if user.totp_backup_codes else 0)

    except Exception as e:
        logger.error(f"2FA settings error: {e}")
        flash('Wystapil blad.', 'error')
        return redirect(url_for('dashboard'))
    finally:
        db.close()


# ============================================================
# PRIVACY SETTINGS
# ============================================================

@bp.route('/settings/privacy', methods=['GET', 'POST'])
@login_required
def settings_privacy():
    """Privacy settings - control visibility of phone and email"""
    db = SessionLocal()
    try:
        user = db.query(User).get(current_user.id)

        if request.method == 'POST':
            # Update privacy settings
            user.privacy_show_phone = request.form.get('show_phone') == 'on'
            user.privacy_show_email = request.form.get('show_email') == 'on'

            # Update contact preferences
            user.contact_prefer_email = request.form.get('prefer_email') == 'on'
            user.contact_prefer_phone = request.form.get('prefer_phone') == 'on'
            user.contact_prefer_portal = request.form.get('prefer_portal') == 'on'
            user.contact_note = request.form.get('contact_note', '').strip() or None

            db.commit()

            logger.info(f"Privacy settings updated for user: {user.email}")
            flash('Ustawienia prywatnosci zostaly zapisane.', 'success')
            return redirect(url_for('auth.settings_privacy'))

        return render_template('settings/privacy.html',
                               user=user,
                               show_phone=user.privacy_show_phone if user.privacy_show_phone is not None else True,
                               show_email=user.privacy_show_email if user.privacy_show_email is not None else True)

    except Exception as e:
        logger.error(f"Privacy settings error: {e}")
        flash('Wystapil blad.', 'error')
        return redirect(url_for('dashboard'))
    finally:
        db.close()


# ============================================================
# BLOCK SETTINGS
# ============================================================

@bp.route('/settings/blocks', methods=['GET'])
@login_required
def settings_blocks():
    """Manage blocked users"""
    db = SessionLocal()
    try:
        # Get list of blocked users
        blocks = db.query(UserBlock).filter(
            UserBlock.user_id == current_user.id
        ).all()

        # Get all users for blocking (exclude self and already blocked)
        blocked_ids = [b.blocked_user_id for b in blocks]
        blocked_ids.append(current_user.id)

        available_users = db.query(User).filter(
            User.id.notin_(blocked_ids),
            User.is_active == True
        ).order_by(User.name).all()

        return render_template('settings/blocks.html',
                               blocks=blocks,
                               available_users=available_users)
    finally:
        db.close()


@bp.route('/settings/blocks/add', methods=['POST'])
@login_required
def settings_blocks_add():
    """Block a user"""
    user_id = request.form.get('user_id', type=int)
    reason = request.form.get('reason', '').strip()

    if not user_id or user_id == current_user.id:
        flash('Nieprawidlowy uzytkownik.', 'error')
        return redirect(url_for('auth.settings_blocks'))

    db = SessionLocal()
    try:
        # Check if already blocked
        existing = db.query(UserBlock).filter(
            UserBlock.user_id == current_user.id,
            UserBlock.blocked_user_id == user_id
        ).first()

        if existing:
            flash('Ten uzytkownik jest juz zablokowany.', 'warning')
            return redirect(url_for('auth.settings_blocks'))

        block = UserBlock(
            user_id=current_user.id,
            blocked_user_id=user_id,
            reason=reason if reason else None
        )
        db.add(block)
        db.commit()

        logger.info(f"User {current_user.id} blocked user {user_id}")
        flash('Uzytkownik zostal zablokowany.', 'success')
    except Exception as e:
        logger.error(f"Error blocking user: {e}")
        flash('Wystapil blad.', 'error')
    finally:
        db.close()

    return redirect(url_for('auth.settings_blocks'))


@bp.route('/settings/blocks/remove/<int:block_id>', methods=['POST'])
@login_required
def settings_blocks_remove(block_id):
    """Unblock a user"""
    db = SessionLocal()
    try:
        block = db.query(UserBlock).filter(
            UserBlock.id == block_id,
            UserBlock.user_id == current_user.id
        ).first()

        if not block:
            flash('Blokada nie istnieje.', 'error')
            return redirect(url_for('auth.settings_blocks'))

        blocked_user_id = block.blocked_user_id
        db.delete(block)
        db.commit()

        logger.info(f"User {current_user.id} unblocked user {blocked_user_id}")
        flash('Uzytkownik zostal odblokowany.', 'success')
    except Exception as e:
        logger.error(f"Error unblocking user: {e}")
        flash('Wystapil blad.', 'error')
    finally:
        db.close()

    return redirect(url_for('auth.settings_blocks'))


# ============================================================
# MOJE KONTO - User Account Settings
# ============================================================

@bp.route('/konto')
@login_required
def konto_dane():
    """User profile - edit personal data"""
    return render_template('konto/dane.html')


@bp.route('/konto', methods=['POST'])
@login_required
def konto_dane_post():
    """Save user profile changes"""
    db = SessionLocal()
    try:
        user = db.query(User).filter_by(id=current_user.id).first()
        if user:
            name = sanitize_input(request.form.get('name', ''), 255)
            phone = sanitize_input(request.form.get('phone', ''), 50)

            user.name = name if name else None
            user.phone = phone if phone else None
            db.commit()

            # Update current_user session
            current_user.name = user.name
            current_user.phone = user.phone

            logger.info(f"Profile updated for user: {user.email}")
            flash('Dane zostaly zapisane.', 'success')
    except Exception as e:
        logger.error(f"Profile update error: {e}")
        flash('Wystapil blad podczas zapisywania.', 'error')
    finally:
        db.close()

    return redirect(url_for('auth.konto_dane'))


@bp.route('/konto/avatar', methods=['POST'])
@login_required
def konto_avatar_upload():
    """Upload or replace user avatar photo"""
    from file_upload_service import FileUploadService, _BASE_DIR
    from PIL import Image

    file = request.files.get('avatar')
    if not file or file.filename == '':
        flash('Nie wybrano pliku.', 'error')
        return redirect(url_for('auth.konto_dane'))

    # Validate using existing service
    is_valid, error = FileUploadService.validate_file(file)
    if not is_valid:
        flash(error, 'error')
        return redirect(url_for('auth.konto_dane'))

    db = SessionLocal()
    try:
        user = db.query(User).filter_by(id=current_user.id).first()
        if not user:
            flash('Nie znaleziono użytkownika.', 'error')
            return redirect(url_for('auth.konto_dane'))

        # Generate filename and path
        ext = file.filename.rsplit('.', 1)[-1].lower()
        if ext == 'jpeg':
            ext = 'jpg'
        import uuid
        stored_filename = f"{uuid.uuid4()}.{ext}"

        now = datetime.now()
        avatar_dir = os.path.join(_BASE_DIR, 'static', 'uploads', 'avatars', str(now.year), f"{now.month:02d}")
        os.makedirs(avatar_dir, exist_ok=True)
        file_path = os.path.join(avatar_dir, stored_filename)

        # Resize to 300x300 square crop, strip EXIF
        img = Image.open(file)
        if img.mode in ('RGBA', 'LA', 'P') and ext == 'jpg':
            img = img.convert('RGB')
        elif img.mode not in ('RGB', 'RGBA'):
            img = img.convert('RGB')

        # Center crop to square
        w, h = img.size
        side = min(w, h)
        left = (w - side) // 2
        top = (h - side) // 2
        img = img.crop((left, top, left + side, top + side))
        img = img.resize((300, 300), Image.LANCZOS)

        # Save
        save_kwargs = {'optimize': True}
        if ext == 'jpg':
            save_kwargs['quality'] = 85
        img.save(file_path, **save_kwargs)

        # Delete old avatar if exists
        if user.avatar_path:
            old_path = os.path.join(_BASE_DIR, 'static', user.avatar_path)
            if os.path.exists(old_path):
                try:
                    os.remove(old_path)
                except OSError:
                    pass

        # Save relative path
        user.avatar_path = os.path.relpath(file_path, os.path.join(_BASE_DIR, 'static'))
        db.commit()
        current_user.avatar_path = user.avatar_path

        logger.info(f"Avatar uploaded for user {user.id}: {user.avatar_path}")
        flash('Zdjęcie profilowe zostało zapisane.', 'success')

    except Exception as e:
        db.rollback()
        logger.error(f"Avatar upload error: {e}")
        flash('Wystąpił błąd podczas zapisywania zdjęcia.', 'error')
    finally:
        db.close()

    return redirect(url_for('auth.konto_dane'))


@bp.route('/konto/avatar/delete', methods=['POST'])
@login_required
def konto_avatar_delete():
    """Delete user avatar photo"""
    from file_upload_service import _BASE_DIR

    db = SessionLocal()
    try:
        user = db.query(User).filter_by(id=current_user.id).first()
        if user and user.avatar_path:
            # Delete file
            old_path = os.path.join(_BASE_DIR, 'static', user.avatar_path)
            if os.path.exists(old_path):
                try:
                    os.remove(old_path)
                except OSError:
                    pass

            user.avatar_path = None
            db.commit()
            current_user.avatar_path = None

            logger.info(f"Avatar deleted for user {user.id}")
            flash('Zdjęcie profilowe zostało usunięte.', 'success')
    except Exception as e:
        db.rollback()
        logger.error(f"Avatar delete error: {e}")
        flash('Wystąpił błąd podczas usuwania zdjęcia.', 'error')
    finally:
        db.close()

    return redirect(url_for('auth.konto_dane'))


@bp.route('/konto/prywatnosc', methods=['GET', 'POST'])
@login_required
def konto_prywatnosc():
    """Privacy settings - control visibility of phone and email"""
    db = SessionLocal()
    try:
        user = db.query(User).filter_by(id=current_user.id).first()

        if request.method == 'POST':
            user.privacy_show_phone = request.form.get('show_phone') == 'on'
            user.privacy_show_email = request.form.get('show_email') == 'on'
            user.contact_prefer_email = request.form.get('prefer_email') == 'on'
            user.contact_prefer_phone = request.form.get('prefer_phone') == 'on'
            user.contact_prefer_portal = request.form.get('prefer_portal') == 'on'
            user.notify_email_messages = request.form.get('notify_email_messages') == 'on'
            db.commit()

            logger.info(f"Privacy settings updated for user: {user.email}")
            flash('Ustawienia prywatności zostały zapisane.', 'success')
            return redirect(url_for('auth.konto_prywatnosc'))

        return render_template('konto/prywatnosc.html',
                               user=user,
                               show_phone=user.privacy_show_phone if user.privacy_show_phone is not None else True,
                               show_email=user.privacy_show_email if user.privacy_show_email is not None else True)
    except Exception as e:
        logger.error(f"Privacy settings error: {e}")
        flash('Wystapil blad.', 'error')
        return redirect(url_for('auth.konto_dane'))
    finally:
        db.close()


@bp.route('/konto/bezpieczenstwo')
@login_required
def konto_bezpieczenstwo():
    """Security settings - 2FA, password"""
    return render_template('konto/bezpieczenstwo.html')


@bp.route('/konto/blokady')
@login_required
def konto_blokady():
    """User blocks management"""
    db = SessionLocal()
    try:
        blocks = db.query(UserBlock).filter_by(user_id=current_user.id).all()
        blocked_ids = [b.blocked_user_id for b in blocks]
        blocked_ids.append(current_user.id)

        available_users = db.query(User).filter(
            User.id.notin_(blocked_ids),
            User.is_active == True
        ).order_by(User.name).all()

        return render_template('konto/blokady.html',
                               blocks=blocks,
                               available_users=available_users)
    except Exception as e:
        logger.error(f"Blocks page error: {e}")
        flash('Wystapil blad.', 'error')
        return redirect(url_for('auth.konto_dane'))
    finally:
        db.close()


@bp.route('/konto/blokady/dodaj', methods=['POST'])
@login_required
def konto_blokady_dodaj():
    """Block a user"""
    db = SessionLocal()
    try:
        user_id = request.form.get('user_id', type=int)
        if not user_id or user_id == current_user.id:
            flash('Nieprawidlowy uzytkownik.', 'error')
            return redirect(url_for('auth.konto_blokady'))

        existing = db.query(UserBlock).filter_by(
            user_id=current_user.id,
            blocked_user_id=user_id
        ).first()

        if existing:
            flash('Ten uzytkownik jest juz zablokowany.', 'info')
            return redirect(url_for('auth.konto_blokady'))

        block = UserBlock(user_id=current_user.id, blocked_user_id=user_id)
        db.add(block)
        db.commit()

        logger.info(f"User {current_user.id} blocked user {user_id}")
        flash('Uzytkownik zostal zablokowany.', 'success')
    except Exception as e:
        logger.error(f"Error blocking user: {e}")
        flash('Wystapil blad.', 'error')
    finally:
        db.close()

    return redirect(url_for('auth.konto_blokady'))


@bp.route('/konto/integracje')
@login_required
def konto_integracje():
    """OAuth integrations page for MANAGER+.

    Allows connecting Google/Meta accounts for enriched audit data.
    """
    if not current_user.has_role(SystemRole.MANAGER):
        flash('Ta strona wymaga uprawnień kadry zarządzającej.', 'error')
        return redirect(url_for('auth.konto_dane'))
    if not current_user.company_id:
        flash('Musisz byc przypisany do firmy, aby korzystac z integracji.', 'info')
        return redirect(url_for('auth.konto_dane'))

    db = SessionLocal()
    try:
        company = db.query(Company).filter(Company.id == current_user.company_id).first()
        if not company:
            flash('Firma nie istnieje.', 'error')
            return redirect(url_for('auth.konto_dane'))

        from oauth_service import OAuthService
        oauth = OAuthService()
        connections = oauth.get_connected_services(db, current_user.company_id)

        oauth_available = {
            'google': bool(oauth.google_client_id),
            'meta': bool(oauth.meta_app_id),
        }

        return render_template(
            'admin/company_settings.html',
            company=company,
            connections=connections,
            oauth_available=oauth_available,
            is_user_view=True,
        )
    finally:
        db.close()


@bp.route('/konto/blokady/usun/<int:block_id>', methods=['POST'])
@login_required
def konto_blokady_usun(block_id):
    """Unblock a user"""
    db = SessionLocal()
    try:
        block = db.query(UserBlock).filter(
            UserBlock.id == block_id,
            UserBlock.user_id == current_user.id
        ).first()

        if not block:
            flash('Blokada nie istnieje.', 'error')
            return redirect(url_for('auth.konto_blokady'))

        blocked_user_id = block.blocked_user_id
        db.delete(block)
        db.commit()

        logger.info(f"User {current_user.id} unblocked user {blocked_user_id}")
        flash('Uzytkownik zostal odblokowany.', 'success')
    except Exception as e:
        logger.error(f"Error unblocking user: {e}")
        flash('Wystapil blad.', 'error')
    finally:
        db.close()

    return redirect(url_for('auth.konto_blokady'))


# ============================================================
# PASSWORD RESET
# ============================================================

@bp.route('/forgot-password', methods=['GET', 'POST'])
@limiter.limit("20 per hour")
def forgot_password():
    """Request password reset"""
    if current_user.is_authenticated:
        return redirect(url_for('index'))

    if request.method == 'POST':
        email = sanitize_input(request.form.get('email', ''), 255)

        if not validate_email(email):
            flash('Nieprawidlowy format adresu email.', 'error')
            return render_template('auth/forgot_password.html')

        db = SessionLocal()
        try:
            user = db.query(User).filter_by(email=email, is_active=True).first()

            if user:
                # Generate reset token
                reset_token = secrets.token_urlsafe(32)
                reset_expires = datetime.now() + timedelta(hours=1)

                # Save token to database
                user.reset_token = reset_token
                user.reset_token_expires = reset_expires
                db.commit()

                # Build reset URL
                base_url = os.getenv('APP_URL', 'https://nordabiznes.pl')
                reset_url = f"{base_url}/reset-password/{reset_token}"

                # Try to send email
                try:
                    import email_service
                    if email_service.is_configured():
                        success = email_service.send_password_reset_email(email, reset_url)
                        if success:
                            logger.info(f"Password reset email sent to {email}")
                        else:
                            logger.warning(f"Failed to send password reset email to {email}")
                            logger.info(f"Reset token (email failed) for {email}: {reset_token[:8]}...")
                    else:
                        logger.warning("Email service not configured")
                        logger.info(f"Reset token (no email) for {email}: {reset_token[:8]}...")
                except Exception as e:
                    logger.error(f"Error sending reset email: {e}")
                    logger.info(f"Reset token (exception) for {email}: {reset_token[:8]}...")

            # Always show same message to prevent email enumeration
            flash('Jesli email istnieje w systemie, instrukcje resetowania hasla zostaly wyslane.', 'info')
            return redirect(url_for('login'))

        except Exception as e:
            logger.error(f"Password reset error: {e}")
            flash('Wystapil blad. Sprobuj ponownie.', 'error')
        finally:
            db.close()

    return render_template('auth/forgot_password.html')


@bp.route('/reset-password/<token>', methods=['GET', 'POST'])
@limiter.limit("30 per hour")
def reset_password(token):
    """Reset password with token"""
    if current_user.is_authenticated:
        return redirect(url_for('index'))

    db = SessionLocal()
    try:
        # Find user with valid token
        user = db.query(User).filter(
            User.reset_token == token,
            User.reset_token_expires > datetime.now(),
            User.is_active == True
        ).first()

        if not user:
            flash('Link resetowania hasla jest nieprawidlowy lub wygasl.', 'error')
            return redirect(url_for('auth.forgot_password'))

        if request.method == 'POST':
            password = request.form.get('password', '')
            password_confirm = request.form.get('password_confirm', '')

            # Validate passwords match
            if password != password_confirm:
                flash('Hasla nie sa identyczne.', 'error')
                return render_template('auth/reset_password.html', token=token)

            # Validate password strength
            password_valid, password_message = validate_password(password)
            if not password_valid:
                flash(password_message, 'error')
                return render_template('auth/reset_password.html', token=token)

            # Update password and clear reset token
            user.password_hash = generate_password_hash(password, method='pbkdf2:sha256')
            user.reset_token = None
            user.reset_token_expires = None

            # Auto-verify email - user proved inbox access by using reset link
            if not user.is_verified:
                user.is_verified = True
                user.verified_at = datetime.now()
                user.verification_token = None
                user.verification_token_expires = None
                logger.info(f"Email auto-verified via password reset for {user.email}")

            # Notify admin if this is a first-time activation (user never logged in)
            first_activation = user.last_login is None

            db.commit()

            logger.info(f"Password reset successful for {user.email}")

            if first_activation:
                try:
                    import email_service
                    email_service.send_email(
                        to=['maciej.pienczyn@inpi.pl'],
                        subject=f'Aktywacja konta: {user.name}',
                        body_text=f'{user.name} ({user.email}) właśnie ustawił(a) hasło i aktywował(a) swoje konto w portalu Norda Biznes Partner.',
                        email_type='admin_notification',
                        bcc=[]
                    )
                except Exception as notify_err:
                    logger.warning(f"Failed to send activation notification: {notify_err}")

            flash('Haslo zostalo zmienione. Mozesz sie teraz zalogowac.', 'success')
            return redirect(url_for('login'))

        return render_template('auth/reset_password.html', token=token)

    except Exception as e:
        logger.error(f"Reset password error: {e}")
        flash('Wystapil blad. Sprobuj ponownie.', 'error')
        return redirect(url_for('auth.forgot_password'))
    finally:
        db.close()


# ============================================================
# EMAIL VERIFICATION
# ============================================================

@bp.route('/verify-email/<token>')
def verify_email(token):
    """Verify email address with token"""
    db = SessionLocal()
    try:
        user = db.query(User).filter(
            User.verification_token == token,
            User.verification_token_expires > datetime.now(),
            User.is_active == True
        ).first()

        if not user:
            flash('Link weryfikacyjny jest nieprawidlowy lub wygasl.', 'error')
            return redirect(url_for('login'))

        if user.is_verified:
            # Already verified - auto-login if not logged in
            if not current_user.is_authenticated:
                login_user(user, remember=True)
                user.last_login = datetime.now()
                user.login_count = (user.login_count or 0) + 1
                db.commit()
                flash('Witamy ponownie! Zostales automatycznie zalogowany.', 'info')
                return redirect(url_for('dashboard'))
            flash('Email zostal juz zweryfikowany.', 'info')
            return redirect(url_for('dashboard'))

        # Verify user (keep token until natural expiry so double-clicks
        # and email client prefetch don't show a confusing error)
        user.is_verified = True
        user.verified_at = datetime.now()

        # Auto-login the user after verification
        login_user(user, remember=True)
        user.last_login = datetime.now()
        user.login_count = (user.login_count or 0) + 1

        # Log successful verification and login
        client_ip = request.headers.get('X-Forwarded-For', request.remote_addr)
        if client_ip and ',' in client_ip:
            client_ip = client_ip.split(',')[0].strip()
        log_audit(db, 'email_verified', 'user', entity_id=user.id, entity_name=user.email,
                  details={'ip': client_ip})
        log_audit(db, 'login', 'user', entity_id=user.id, entity_name=user.email,
                  details={'method': 'email_verification', 'ip': client_ip})

        db.commit()

        logger.info(f"Email verified and auto-logged in: {user.email}")
        flash('Email zweryfikowany! Witamy w Norda Biznes Partner.', 'success')
        return redirect(url_for('dashboard'))

    except Exception as e:
        logger.error(f"Email verification error: {e}")
        flash('Wystapil blad podczas weryfikacji.', 'error')
        return redirect(url_for('login'))
    finally:
        db.close()


@bp.route('/resend-verification', methods=['GET', 'POST'])
@limiter.limit("15 per hour")
def resend_verification():
    """Resend email verification link"""
    if current_user.is_authenticated:
        return redirect(url_for('index'))

    if request.method == 'POST':
        email = sanitize_input(request.form.get('email', ''), 255)

        if not validate_email(email):
            flash('Nieprawidlowy format adresu email.', 'error')
            return render_template('auth/resend_verification.html')

        db = SessionLocal()
        try:
            user = db.query(User).filter_by(email=email, is_active=True).first()

            if user and not user.is_verified:
                # Generate new verification token
                verification_token = secrets.token_urlsafe(32)
                verification_expires = datetime.now() + timedelta(hours=24)

                # Update user token
                user.verification_token = verification_token
                user.verification_token_expires = verification_expires
                db.commit()

                # Build verification URL
                base_url = os.getenv('APP_URL', 'https://nordabiznes.pl')
                verification_url = f"{base_url}/verify-email/{verification_token}"

                # Try to send email
                try:
                    import email_service
                    if email_service.is_configured():
                        success = email_service.send_welcome_email(email, user.name, verification_url)
                        if success:
                            logger.info(f"Verification email resent to {email}")
                        else:
                            logger.warning(f"Failed to resend verification email to {email}")
                            logger.info(f"Resend verification token (email failed) for {email}: {verification_token[:8]}...")
                    else:
                        logger.warning("Email service not configured")
                        logger.info(f"Resend verification token (no email) for {email}: {verification_token[:8]}...")
                except Exception as e:
                    logger.error(f"Error resending verification email: {e}")
                    logger.info(f"Resend verification token (exception) for {email}: {verification_token[:8]}...")

            # Always show same message to prevent email enumeration
            flash('Jesli konto istnieje i nie zostalo zweryfikowane, email weryfikacyjny zostal wyslany.', 'info')
            return redirect(url_for('login'))

        except Exception as e:
            logger.error(f"Resend verification error: {e}")
            flash('Wystapil blad. Sprobuj ponownie.', 'error')
        finally:
            db.close()

    return render_template('auth/resend_verification.html')