import io
import zipfile
from datetime import datetime, timedelta
from pathlib import Path
from uuid import uuid4

from flask import (
    Blueprint, abort, render_template, request, redirect, url_for, flash,
    session, jsonify, send_file, current_app, has_request_context, make_response
)
from sqlalchemy import distinct, func, or_
from sqlalchemy.exc import IntegrityError
from sqlalchemy.orm import selectinload

from app import db, limiter
from app.models import User, Event, Guest, CheckIn, AuditLog, SmtpSettings, event_staff, utcnow
from app.services.qr_service import generate_qr_for_guest
from app.services.email_service import send_invitation, send_test_email
from app.services.excel_service import build_guest_import_template, import_guests_from_excel, export_report_to_excel
from app.services.ticket_service import generate_ticket_image, generate_preview_ticket
from app.services.audit_service import log_action
from app.utils.timezone import utc_to_local, local_to_utc
from app.utils.paths import event_photo_folder, event_qr_folder, event_logo_folder, event_tickets_folder, ensure_event_folders, safe_child_path
from app.utils.security import (
    ALLOWED_IMAGE_EXTENSIONS,
    image_extension,
    safe_upload_filename,
    save_validated_image,
    validate_zip_size,
    validate_password,
)
from app.utils.queue import enqueue_event_invitations

main_bp = Blueprint("main", __name__)


@main_bp.app_template_filter("localtime")
def _localtime_filter(dt, fmt="%d.%m.%Y %H:%M"):
    if not dt:
        return ""
    return utc_to_local(dt).strftime(fmt)


@main_bp.app_template_filter("localdate")
def _localdate_filter(dt, fmt="%d.%m.%Y"):
    if not dt:
        return ""
    return utc_to_local(dt).strftime(fmt)


# ---------------------------
# Helpers
# ---------------------------

def allowed_file(filename, extensions):
    return "." in filename and filename.rsplit(".", 1)[1].lower() in extensions


def _save_image(stream, destination):
    return save_validated_image(
        stream,
        destination,
        max_bytes=current_app.config["MAX_IMAGE_BYTES"],
        max_pixels=current_app.config["MAX_IMAGE_PIXELS"],
    )


def current_user():
    if not has_request_context():
        return None
    user_id = session.get("user_id")
    session_version = session.get("session_version")
    if user_id:
        user = db.session.get(User, user_id)
        if user and user.is_active and user.session_version == session_version:
            return user
        # Сессия устарела или пользователь заблокирован
        logout_user()
    return None


def login_user(user):
    session["user_id"] = user.id
    session["role"] = user.role
    session["session_version"] = user.session_version
    session.permanent = True


def logout_user():
    session.pop("user_id", None)
    session.pop("role", None)
    session.pop("session_version", None)
    session.pop("current_event_id", None)
    session.pop("checkin_event_id", None)


def require_role(*roles):
    def decorator(f):
        def wrapped(*args, **kwargs):
            user = current_user()
            if not user or not user.is_active or user.role not in roles:
                flash("Требуется авторизация", "warning")
                return redirect(url_for("main.login"))
            return f(*args, **kwargs)
        wrapped.__name__ = f.__name__
        return wrapped
    return decorator


def require_login(f):
    def wrapped(*args, **kwargs):
        user = current_user()
        if not user or not user.is_active:
            flash("Требуется авторизация", "warning")
            return redirect(url_for("main.login"))
        return f(*args, **kwargs)
    wrapped.__name__ = f.__name__
    return wrapped


def get_current_event():
    event_id = session.get("current_event_id")
    if event_id:
        user = current_user()
        event = db.session.get(Event, event_id)
        if event and user and user.can_manage_event(event):
            return event
    return None


def require_event(f):
    """Декоратор для маршрутов, требующих выбранного мероприятия (admin/organizer)."""
    def wrapped(*args, **kwargs):
        user = current_user()
        if not user:
            flash("Требуется авторизация", "warning")
            return redirect(url_for("main.login"))
        if not get_current_event():
            flash("Сначала выберите мероприятие", "warning")
            return redirect(url_for("main.admin_events"))
        return f(*args, **kwargs)
    wrapped.__name__ = f.__name__
    return wrapped


def available_events_for_user(user):
    if user.is_admin:
        return Event.query.order_by(Event.created_at.desc())
    if user.is_staff:
        return Event.query.join(event_staff).filter(event_staff.c.user_id == user.id).order_by(Event.created_at.desc())
    return Event.query.filter_by(created_by_id=user.id).order_by(Event.created_at.desc())


def can_access_event(user, event):
    if not user or not event:
        return False
    if user.is_admin or user.can_manage_event(event):
        return True
    return user.is_staff and any(staff.id == user.id for staff in event.staff_members)


def _selected_staff_users():
    staff_ids = {value for value in request.form.getlist("staff_ids") if value.isdigit()}
    if not staff_ids:
        return []
    return User.query.filter(User.id.in_(staff_ids), User.role == "staff", User.is_active == True).all()


def require_event_access(event):
    if not can_access_event(current_user(), event):
        abort(403)


def _setup_available():
    return bool(current_app.config.get("ALLOW_WEB_SETUP"))


def _guest_search_expression(search):
    pattern = f"%{search}%"
    return or_(
        Guest.full_name.ilike(pattern), Guest.last_name.ilike(pattern),
        Guest.first_name.ilike(pattern), Guest.middle_name.ilike(pattern),
        Guest.department.ilike(pattern), Guest.position.ilike(pattern),
        Guest.email.ilike(pattern), Guest.phone.ilike(pattern),
    )


def _parse_local_datetime(value):
    if not value:
        return None
    return local_to_utc(datetime.fromisoformat(value))


def _single_line(value, max_length=255):
    return " ".join(str(value or "").splitlines()).strip()[:max_length] or None


def _rsvp_is_open(event):
    return bool(
        event and event.is_active and event.rsvp_enabled
        and (not event.rsvp_deadline or utcnow() <= event.rsvp_deadline)
    )


def _ics_escape(value):
    return str(value or "").replace("\\", "\\\\").replace(";", "\\;").replace(",", "\\,").replace("\n", "\\n")


def _ics_datetime(value):
    return value.strftime("%Y%m%dT%H%M%SZ")


# ---------------------------
# Guest invitation / RSVP
# ---------------------------

@main_bp.route("/invite/<token>", methods=["GET", "POST"])
@limiter.limit("30 per minute")
def public_invitation(token):
    guest = Guest.query.filter_by(token=token, is_active=True).first_or_404()
    event = guest.event
    if not event or not event.is_active:
        abort(404)

    rsvp_open = _rsvp_is_open(event)
    if request.method == "POST":
        if not rsvp_open:
            flash("Срок подтверждения участия завершён", "warning")
            return redirect(url_for("main.public_invitation", token=token))

        status = request.form.get("rsvp_status", "").strip()
        if status not in {"confirmed", "declined"}:
            flash("Выберите вариант ответа", "danger")
            return redirect(url_for("main.public_invitation", token=token))

        previous_status = guest.rsvp_status
        guest.rsvp_status = status
        guest.rsvp_responded_at = utcnow()
        guest.rsvp_comment = request.form.get("rsvp_comment", "").strip()[:1000] or None
        guest.dietary_requirements = request.form.get("dietary_requirements", "").strip()[:1000] or None
        log_action(
            "guest_rsvp_update",
            target_type="guest",
            target_id=guest.id,
            details=f"RSVP изменён: {previous_status} -> {status}",
        )
        db.session.commit()
        flash("Ваш ответ сохранён", "success")
        return redirect(url_for("main.public_invitation", token=token))

    return render_template(
        "invitation.html",
        guest=guest,
        event=event,
        rsvp_open=rsvp_open,
    )


@main_bp.get("/invite/<token>/calendar.ics")
@limiter.limit("30 per minute")
def public_invitation_calendar(token):
    guest = Guest.query.filter_by(token=token, is_active=True).first_or_404()
    event = guest.event
    if not event or not event.is_active or not event.event_date:
        abort(404)

    end_date = event.event_end_date or (event.event_date + timedelta(hours=2))
    invitation_url = url_for("main.public_invitation", token=guest.token, _external=True)
    content = "\r\n".join([
        "BEGIN:VCALENDAR",
        "VERSION:2.0",
        "PRODID:-//InviteMe//Invitation//RU",
        "CALSCALE:GREGORIAN",
        "METHOD:PUBLISH",
        "BEGIN:VEVENT",
        f"UID:event-{event.id}-{guest.token}@inviteme",
        f"DTSTAMP:{_ics_datetime(utcnow())}",
        f"DTSTART:{_ics_datetime(event.event_date)}",
        f"DTEND:{_ics_datetime(end_date)}",
        f"SUMMARY:{_ics_escape(event.name)}",
        f"DESCRIPTION:{_ics_escape(event.description)}",
        f"LOCATION:{_ics_escape(event.location)}",
        f"URL:{_ics_escape(invitation_url)}",
        "END:VEVENT",
        "END:VCALENDAR",
        "",
    ])
    response = make_response(content)
    response.headers["Content-Type"] = "text/calendar; charset=utf-8"
    response.headers["Content-Disposition"] = 'attachment; filename="invitation.ics"'
    return response


@main_bp.get("/invite/<token>/ticket")
@limiter.limit("20 per minute")
def public_invitation_ticket(token):
    guest = Guest.query.filter_by(token=token, is_active=True).first_or_404()
    if not guest.event or not guest.event.is_active:
        abort(404)
    ticket_path = generate_ticket_image(guest, guest.event)
    return send_file(
        str(ticket_path),
        as_attachment=True,
        download_name=f"InviteMe-{guest.token}.png",
        mimetype="image/png",
    )


# ---------------------------
# Auth
# ---------------------------

def _is_first_run():
    """True, если в базе ещё нет ни одного пользователя."""
    return User.query.first() is None


@main_bp.route("/setup", methods=["GET", "POST"])
@limiter.limit("5 per hour", methods=["POST"])
def setup():
    """Первоначальная настройка: создание первого администратора."""
    if not _setup_available():
        abort(404)
    if not _is_first_run():
        return redirect(url_for("main.login"))

    if request.method == "POST":
        username = request.form.get("username", "").strip()
        password = request.form.get("password", "").strip()
        password_confirm = request.form.get("password_confirm", "").strip()

        if not username or not password:
            flash("Логин и пароль обязательны", "danger")
            return redirect(url_for("main.setup"))

        if password != password_confirm:
            flash("Пароли не совпадают", "danger")
            return redirect(url_for("main.setup"))

        password_error = validate_password(password, current_app.config["MIN_PASSWORD_LENGTH"])
        if password_error:
            flash(password_error, "danger")
            return redirect(url_for("main.setup"))

        if User.query.filter_by(username=username).first():
            flash("Пользователь с таким логином уже существует", "danger")
            return redirect(url_for("main.setup"))

        admin = User(username=username, role="admin", is_active=True)
        admin.set_password(password)
        db.session.add(admin)
        db.session.commit()

        flash("Первый администратор создан. Войдите в систему.", "success")
        return redirect(url_for("main.login"))

    return render_template("setup.html")


@main_bp.route("/login", methods=["GET", "POST"])
@limiter.limit("10 per minute", methods=["POST"])
def login():
    if _is_first_run():
        if _setup_available():
            return redirect(url_for("main.setup"))
        flash("Система не настроена. Создайте администратора через командную строку.", "warning")
        return render_template("login.html"), 503

    if request.method == "POST":
        username = request.form.get("username", "").strip()
        password = request.form.get("password", "").strip()

        user = User.query.filter_by(username=username, is_active=True).first()
        if user and user.check_password(password):
            login_user(user)
            log_action("login", target_type="user", target_id=user.id, details="Успешный вход")
            db.session.commit()
            if user.is_staff:
                return redirect(url_for("main.check_in"))
            return redirect(url_for("main.admin_panel"))
        else:
            flash("Неверный логин или пароль", "danger")

    return render_template("login.html")


@main_bp.route("/logout", methods=["POST"])
@require_login
def logout():
    log_action("logout")
    db.session.commit()
    logout_user()
    flash("Вы вышли из системы", "info")
    return redirect(url_for("main.login"))


# ---------------------------
# Events
# ---------------------------

@main_bp.route("/admin/events")
@require_role("admin", "organizer")
def admin_events():
    user = current_user()
    events = available_events_for_user(user).all()
    for event in events:
        event.total_guests = Guest.query.filter_by(event_id=event.id, is_active=True).count()
        event.checked_in = db.session.query(func.count(distinct(CheckIn.guest_id))).filter(CheckIn.event_id == event.id).scalar()
    return render_template("admin/events.html", events=events)


@main_bp.route("/admin/events/add", methods=["GET", "POST"])
@require_role("admin", "organizer")
def admin_event_add():
    if request.method == "POST":
        name = request.form.get("name", "").strip()
        description = request.form.get("description", "").strip()
        location = request.form.get("location", "").strip()
        event_date_str = request.form.get("event_date", "").strip()
        event_end_date_str = request.form.get("event_end_date", "").strip()
        rsvp_deadline_str = request.form.get("rsvp_deadline", "").strip()

        if not name:
            flash("Название мероприятия обязательно", "danger")
            return redirect(url_for("main.admin_event_add"))

        try:
            event_date = _parse_local_datetime(event_date_str)
            event_end_date = _parse_local_datetime(event_end_date_str)
            rsvp_deadline = _parse_local_datetime(rsvp_deadline_str)
        except ValueError:
            flash("Неверный формат даты", "danger")
            return redirect(url_for("main.admin_event_add"))
        if event_date and event_end_date and event_end_date <= event_date:
            flash("Время окончания должно быть позже начала", "danger")
            return redirect(url_for("main.admin_event_add"))

        event = Event(
            name=name,
            description=description,
            location=location,
            event_date=event_date,
            event_end_date=event_end_date,
            rsvp_enabled=bool(request.form.get("rsvp_enabled")),
            rsvp_deadline=rsvp_deadline,
            invitation_subject=_single_line(request.form.get("invitation_subject")),
            invitation_message=request.form.get("invitation_message", "").strip()[:5000] or None,
            created_by_id=current_user().id,
        )
        db.session.add(event)
        event.staff_members = _selected_staff_users()
        log_action("event_create", target_type="event", target_id=event.id, details=f"Создано мероприятие '{event.name}'")
        db.session.commit()
        flash(f"Мероприятие «{event.name}» создано", "success")
        return redirect(url_for("main.admin_events"))

    staff_users = User.query.filter_by(role="staff", is_active=True).order_by(User.username).all()
    return render_template("admin/event_form.html", event=None, staff_users=staff_users)


@main_bp.route("/admin/events/<int:event_id>/edit", methods=["GET", "POST"])
@require_role("admin", "organizer")
def admin_event_edit(event_id):
    event = Event.query.get_or_404(event_id)
    user = current_user()
    if not user.can_manage_event(event):
        flash("Нет доступа к этому мероприятию", "danger")
        return redirect(url_for("main.admin_events"))

    if request.method == "POST":
        event.name = request.form.get("name", "").strip()
        event.description = request.form.get("description", "").strip()
        event.location = request.form.get("location", "").strip()
        event_date_str = request.form.get("event_date", "").strip()
        event_end_date_str = request.form.get("event_end_date", "").strip()
        rsvp_deadline_str = request.form.get("rsvp_deadline", "").strip()

        if not event.name:
            flash("Название мероприятия обязательно", "danger")
            return redirect(url_for("main.admin_event_edit", event_id=event.id))

        try:
            event.event_date = _parse_local_datetime(event_date_str)
            event.event_end_date = _parse_local_datetime(event_end_date_str)
            event.rsvp_deadline = _parse_local_datetime(rsvp_deadline_str)
        except ValueError:
            flash("Неверный формат даты", "danger")
            return redirect(url_for("main.admin_event_edit", event_id=event.id))
        if event.event_date and event.event_end_date and event.event_end_date <= event.event_date:
            flash("Время окончания должно быть позже начала", "danger")
            return redirect(url_for("main.admin_event_edit", event_id=event.id))

        event.is_active = bool(request.form.get("is_active"))
        event.rsvp_enabled = bool(request.form.get("rsvp_enabled"))
        event.invitation_subject = _single_line(request.form.get("invitation_subject"))
        event.invitation_message = request.form.get("invitation_message", "").strip()[:5000] or None
        event.staff_members = _selected_staff_users()
        log_action("event_update", target_type="event", target_id=event.id, details=f"Обновлено мероприятие '{event.name}'")
        db.session.commit()
        flash("Мероприятие обновлено", "success")
        return redirect(url_for("main.admin_events"))

    staff_users = User.query.filter_by(role="staff", is_active=True).order_by(User.username).all()
    return render_template("admin/event_form.html", event=event, staff_users=staff_users)


@main_bp.route("/admin/events/<int:event_id>/delete", methods=["POST"])
@require_role("admin", "organizer")
def admin_event_delete(event_id):
    event = Event.query.get_or_404(event_id)
    user = current_user()
    if not user.can_manage_event(event):
        flash("Нет доступа к этому мероприятию", "danger")
        return redirect(url_for("main.admin_events"))

    if session.get("current_event_id") == event.id:
        session.pop("current_event_id", None)

    event.is_active = False
    log_action("event_deactivate", target_type="event", target_id=event.id, details=f"Деактивировано мероприятие '{event.name}'")
    db.session.commit()
    flash("Мероприятие деактивировано", "success")
    return redirect(url_for("main.admin_events"))


@main_bp.route("/admin/events/<int:event_id>/delete-hard", methods=["POST"])
@require_role("admin")
def admin_event_delete_hard(event_id):
    """Полное удаление мероприятия вместе со связанными файлами и данными."""
    event = Event.query.get_or_404(event_id)
    reason = request.form.get("reason", "").strip()

    if not reason:
        flash("Для удаления необходимо указать причину", "danger")
        return redirect(url_for("main.admin_events"))

    if session.get("current_event_id") == event.id:
        session.pop("current_event_id", None)

    # Удаляем связанные файлы
    import shutil

    def _safe_rmtree(path):
        try:
            if path.exists():
                shutil.rmtree(str(path))
        except Exception as e:
            current_app.logger.warning(f"Не удалось удалить папку {path}: {e}")

    # Удаляем папки мероприятия целиком
    _safe_rmtree(event_photo_folder(event.id))
    _safe_rmtree(event_qr_folder(event.id))
    _safe_rmtree(event_logo_folder(event.id))
    _safe_rmtree(event_tickets_folder(event.id))

    event_name = event.name
    log_action(
        "event_delete_hard",
        target_type="event",
        target_id=event.id,
        details=f"Удалено мероприятие '{event_name}'. Причина: {reason}",
    )

    db.session.delete(event)
    db.session.commit()

    flash(f"Мероприятие «{event_name}» и все связанные данные удалены", "success")
    return redirect(url_for("main.admin_events"))


@main_bp.route("/admin/events/<int:event_id>/switch", methods=["POST"])
@require_role("admin", "organizer")
def admin_event_switch(event_id):
    event = Event.query.get_or_404(event_id)
    user = current_user()
    if not user.can_manage_event(event):
        flash("Нет доступа к этому мероприятию", "danger")
        return redirect(url_for("main.admin_events"))

    session["current_event_id"] = event.id
    flash(f"Выбрано мероприятие: {event.name}", "info")
    return redirect(url_for("main.admin_dashboard"))


@main_bp.route("/admin/events/<int:event_id>/ticket", methods=["GET", "POST"])
@require_role("admin", "organizer")
def admin_event_ticket(event_id):
    event = Event.query.get_or_404(event_id)
    user = current_user()
    if not user.can_manage_event(event):
        flash("Нет доступа к этому мероприятию", "danger")
        return redirect(url_for("main.admin_events"))

    if request.method == "POST":
        event.ticket_title = request.form.get("ticket_title", "").strip() or event.name
        event.ticket_subtitle = request.form.get("ticket_subtitle", "").strip()
        event.ticket_body_text = request.form.get("ticket_body_text", "").strip()
        event.ticket_background_color = request.form.get("ticket_background_color", "#ffffff").strip()
        event.ticket_text_color = request.form.get("ticket_text_color", "#000000").strip()
        event.ticket_accent_color = request.form.get("ticket_accent_color", "#0d6efd").strip()
        event.ticket_show_qr = bool(request.form.get("ticket_show_qr"))
        event.ticket_show_photo = bool(request.form.get("ticket_show_photo"))
        event.ticket_layout = request.form.get("ticket_layout", "portrait").strip()

        # Logo upload
        logo_file = request.files.get("logo_file")
        if logo_file and logo_file.filename:
            if allowed_file(logo_file.filename, ALLOWED_IMAGE_EXTENSIONS):
                extension = image_extension(logo_file.filename)
                filename = f"logo_{uuid4().hex}.{extension}"
                logo_folder = event_logo_folder(event.id)
                logo_folder.mkdir(parents=True, exist_ok=True)
                logo_path = logo_folder / filename
                try:
                    _save_image(logo_file.stream, logo_path)
                    if event.logo_filename:
                        previous_logo = safe_child_path(logo_folder, event.logo_filename)
                        if previous_logo and previous_logo.exists() and previous_logo != logo_path:
                            previous_logo.unlink()
                    event.logo_filename = filename
                except ValueError as exc:
                    flash(str(exc), "warning")
            else:
                flash("Неверный формат логотипа. Разрешены: JPG, PNG и WebP.", "warning")

        # Logo deletion
        if request.form.get("delete_logo") and event.logo_filename:
            old_logo = safe_child_path(event_logo_folder(event.id), event.logo_filename)
            if old_logo and old_logo.exists():
                old_logo.unlink()
            event.logo_filename = None

        log_action("event_ticket_update", target_type="event", target_id=event.id, details=f"Обновлён дизайн билета мероприятия '{event.name}'")
        db.session.commit()
        flash("Дизайн билета сохранён", "success")
        return redirect(url_for("main.admin_event_ticket", event_id=event.id))

    return render_template("admin/ticket_constructor.html", event=event)


@main_bp.route("/media/events/<int:event_id>/logo")
@require_role("admin", "organizer", "staff")
def event_logo(event_id):
    event = Event.query.get_or_404(event_id)
    require_event_access(event)
    if not event.logo_filename:
        abort(404)
    logo_path = safe_child_path(event_logo_folder(event.id), event.logo_filename)
    if not logo_path or not logo_path.is_file():
        abort(404)
    return send_file(logo_path, conditional=True, max_age=300)


@main_bp.route("/admin/events/<int:event_id>/ticket/preview")
@require_role("admin", "organizer")
def admin_event_ticket_preview(event_id):
    event = Event.query.get_or_404(event_id)
    user = current_user()
    if not user.can_manage_event(event):
        flash("Нет доступа к этому мероприятию", "danger")
        return redirect(url_for("main.admin_events"))

    try:
        ticket_path = generate_preview_ticket(event)
        return send_file(str(ticket_path), mimetype="image/png")
    except Exception as e:
        flash(f"Ошибка генерации предпросмотра: {str(e)}", "danger")
        return redirect(url_for("main.admin_event_ticket", event_id=event.id))


# ---------------------------
# Admin Dashboard
# ---------------------------

@main_bp.route("/admin")
@require_role("admin", "organizer", "staff")
def admin_index():
    return redirect(url_for("main.admin_panel"))


@main_bp.route("/admin/dashboard")
@require_role("admin", "organizer")
@require_event
def admin_dashboard():
    event = get_current_event()
    total = Guest.query.filter_by(event_id=event.id, is_active=True).count()
    checked_in = db.session.query(func.count(distinct(CheckIn.guest_id))).filter(CheckIn.event_id == event.id).scalar()
    not_checked_in = total - checked_in
    attendance_percent = round((checked_in / total) * 100, 1) if total else 0
    rsvp_confirmed = Guest.query.filter_by(event_id=event.id, is_active=True, rsvp_status="confirmed").count()
    rsvp_declined = Guest.query.filter_by(event_id=event.id, is_active=True, rsvp_status="declined").count()
    rsvp_pending = max(total - rsvp_confirmed - rsvp_declined, 0)

    recent_check_ins = (
        CheckIn.query
        .join(Guest)
        .filter(Guest.event_id == event.id)
        .order_by(CheckIn.checked_in_at.desc())
        .limit(10)
        .all()
    )

    return render_template(
        "admin/dashboard.html",
        event=event,
        total=total,
        checked_in=checked_in,
        not_checked_in=not_checked_in,
        attendance_percent=attendance_percent,
        recent_check_ins=recent_check_ins,
        rsvp_confirmed=rsvp_confirmed,
        rsvp_declined=rsvp_declined,
        rsvp_pending=rsvp_pending,
    )


# ---------------------------
# Upload Excel / Photos
# ---------------------------

@main_bp.route("/admin/upload/template")
@require_role("admin", "organizer")
def admin_upload_template():
    return send_file(
        build_guest_import_template(),
        as_attachment=True,
        download_name="InviteMe_guests_template.xlsx",
        mimetype="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    )

@main_bp.route("/admin/upload", methods=["GET", "POST"])
@require_role("admin", "organizer")
@require_event
def admin_upload():
    event = get_current_event()

    if request.method == "POST":
        # Excel upload
        excel_file = request.files.get("excel_file")
        if excel_file and excel_file.filename:
            if allowed_file(excel_file.filename, {"xlsx"}):
                try:
                    excel_stream = io.BytesIO(excel_file.read())
                    validate_zip_size(
                        excel_stream,
                        current_app.config["MAX_ZIP_FILES"],
                        current_app.config["MAX_XLSX_UNCOMPRESSED_BYTES"],
                    )
                    result = import_guests_from_excel(excel_stream, event_id=event.id)
                    flash(
                        f"Импорт завершён: добавлено {result['imported']}, обновлено {result['updated']} из {result['total']}",
                        "success",
                    )

                    # Generate QR codes for guests without QR
                    base_url = request.form.get("base_url", "").strip() or None
                    guests = Guest.query.filter_by(event_id=event.id).filter(Guest.qr_filename.is_(None)).all()
                    for guest in guests:
                        generate_qr_for_guest(guest, base_url=base_url)
                    log_action(
                        "guests_import",
                        target_type="event",
                        target_id=event.id,
                        details=f"Импорт гостей из Excel: добавлено {result['imported']}, обновлено {result['updated']}",
                    )
                    db.session.commit()

                    flash(f"Сгенерировано QR-кодов: {len(guests)}", "success")
                except Exception as e:
                    flash(f"Ошибка импорта Excel: {str(e)}", "danger")
            else:
                flash("Неверный формат Excel-файла", "danger")

        # Photos upload (ZIP or multiple files)
        photo_files = request.files.getlist("photo_files")
        zip_file = request.files.get("zip_file")

        photo_folder = event_photo_folder(event.id)
        photo_folder.mkdir(parents=True, exist_ok=True)
        uploaded_count = 0

        if zip_file and zip_file.filename:
            if allowed_file(zip_file.filename, {"zip"}):
                try:
                    with zipfile.ZipFile(zip_file.stream, "r") as archive:
                        members = [member for member in archive.infolist() if not member.is_dir()]
                        if len(members) > current_app.config["MAX_ZIP_FILES"]:
                            raise ValueError("В архиве слишком много файлов")
                        total_size = sum(member.file_size for member in members)
                        if total_size > current_app.config["MAX_ZIP_UNCOMPRESSED_BYTES"]:
                            raise ValueError("Архив слишком большой после распаковки")

                        for member in members:
                            try:
                                filename = safe_upload_filename(member.filename)
                            except ValueError:
                                continue
                            if image_extension(filename) not in ALLOWED_IMAGE_EXTENSIONS:
                                continue
                            with archive.open(member, "r") as source:
                                _save_image(source, photo_folder / filename)
                            uploaded_count += 1
                    flash(f"Из ZIP распаковано файлов: {uploaded_count}", "success")
                except (ValueError, zipfile.BadZipFile, RuntimeError) as exc:
                    flash(f"Ошибка распаковки ZIP: {exc}", "danger")
            else:
                flash("Неверный формат ZIP-архива", "danger")

        for photo in photo_files:
            if photo and photo.filename:
                try:
                    filename = safe_upload_filename(photo.filename)
                    if image_extension(filename) not in ALLOWED_IMAGE_EXTENSIONS:
                        raise ValueError("Разрешены только JPG, PNG и WebP")
                    _save_image(photo.stream, photo_folder / filename)
                    uploaded_count += 1
                except ValueError as exc:
                    flash(f"Файл «{photo.filename}» пропущен: {exc}", "warning")

        if uploaded_count:
            flash(f"Загружено фото: {uploaded_count}", "success")
            log_action(
                "photos_upload",
                target_type="event",
                target_id=event.id,
                details=f"Загружено фото гостей: {uploaded_count}",
            )
            db.session.commit()

        return redirect(url_for("main.admin_upload"))

    return render_template("admin/upload.html", event=event)


# ---------------------------
# Guests management
# ---------------------------

@main_bp.route("/admin/guests")
@require_role("admin", "organizer")
@require_event
def admin_guests():
    event = get_current_event()
    search = request.args.get("q", "").strip()
    page = max(request.args.get("page", 1, type=int), 1)
    query = Guest.query.options(selectinload(Guest.check_ins)).filter_by(event_id=event.id)
    if search:
        query = query.filter(_guest_search_expression(search))
    pagination = query.order_by(Guest.full_name).paginate(page=page, per_page=50, error_out=False)
    return render_template("admin/guests.html", event=event, guests=pagination.items, pagination=pagination, search=search)


@main_bp.route("/admin/guests/add", methods=["GET", "POST"])
@require_role("admin", "organizer")
@require_event
def admin_guest_add():
    event = get_current_event()

    if request.method == "POST":
        last_name = request.form.get("last_name", "").strip()
        first_name = request.form.get("first_name", "").strip()
        middle_name = request.form.get("middle_name", "").strip()
        full_name = " ".join([p for p in [last_name, first_name, middle_name] if p])

        if not full_name:
            flash("Фамилия и имя обязательны", "danger")
            return redirect(url_for("main.admin_guest_add"))

        raw_photo_filename = request.form.get("photo_filename", "").strip()
        try:
            photo_filename = safe_upload_filename(raw_photo_filename) if raw_photo_filename else ""
        except ValueError as exc:
            flash(str(exc), "danger")
            return redirect(url_for("main.admin_guest_add"))

        guest = Guest(
            event_id=event.id,
            department=request.form.get("department", "").strip(),
            last_name=last_name,
            first_name=first_name,
            middle_name=middle_name,
            full_name=full_name,
            position=request.form.get("position", "").strip(),
            email=request.form.get("email", "").strip(),
            phone=request.form.get("phone", "").strip(),
            photo_filename=photo_filename,
        )
        db.session.add(guest)
        db.session.commit()

        base_url = request.form.get("base_url", "").strip() or None
        generate_qr_for_guest(guest, base_url=base_url)
        log_action(
            "guest_create",
            target_type="guest",
            target_id=guest.id,
            details=f"Добавлен гость '{guest.build_full_name()}' ({guest.email})",
        )
        db.session.commit()

        if request.form.get("send_invitation"):
            try:
                send_invitation(guest)
                db.session.commit()
                flash("Гость добавлен и приглашение отправлено", "success")
            except Exception as e:
                db.session.commit()
                flash(f"Гость добавлен, но не удалось отправить письмо: {str(e)}", "warning")
        else:
            flash("Гость добавлен", "success")

        return redirect(url_for("main.admin_guests"))

    return render_template("admin/guest_form.html", event=event, guest=None)


@main_bp.route("/admin/guests/<int:guest_id>/edit", methods=["GET", "POST"])
@require_role("admin", "organizer")
@require_event
def admin_guest_edit(guest_id):
    event = get_current_event()
    guest = Guest.query.filter_by(id=guest_id, event_id=event.id).first_or_404()

    if request.method == "POST":
        guest.department = request.form.get("department", "").strip()
        guest.last_name = request.form.get("last_name", "").strip()
        guest.first_name = request.form.get("first_name", "").strip()
        guest.middle_name = request.form.get("middle_name", "").strip()
        guest.full_name = " ".join([
            p for p in [guest.last_name, guest.first_name, guest.middle_name] if p
        ]) or guest.full_name
        guest.position = request.form.get("position", "").strip()
        guest.email = request.form.get("email", "").strip()
        guest.phone = request.form.get("phone", "").strip()
        raw_photo_filename = request.form.get("photo_filename", "").strip()
        try:
            guest.photo_filename = safe_upload_filename(raw_photo_filename) if raw_photo_filename else ""
        except ValueError as exc:
            flash(str(exc), "danger")
            return redirect(url_for("main.admin_guest_edit", guest_id=guest.id))
        log_action(
            "guest_update",
            target_type="guest",
            target_id=guest.id,
            details=f"Обновлены данные гостя '{guest.build_full_name()}'",
        )
        db.session.commit()
        flash("Данные гостя обновлены", "success")
        return redirect(url_for("main.admin_guests"))

    return render_template("admin/guest_form.html", event=event, guest=guest)


@main_bp.route("/admin/guests/<int:guest_id>/delete", methods=["POST"])
@require_role("admin", "organizer")
@require_event
def admin_guest_delete(guest_id):
    event = get_current_event()
    guest = Guest.query.filter_by(id=guest_id, event_id=event.id).first_or_404()
    guest.is_active = False
    log_action(
        "guest_deactivate",
        target_type="guest",
        target_id=guest.id,
        details=f"Гость '{guest.build_full_name()}' заблокирован",
    )
    db.session.commit()
    flash("Гость заблокирован (QR-код аннулирован)", "success")
    return redirect(url_for("main.admin_guests"))


@main_bp.route("/admin/guests/<int:guest_id>/resend", methods=["POST"])
@require_role("admin", "organizer")
@require_event
def admin_guest_resend(guest_id):
    event = get_current_event()
    guest = Guest.query.filter_by(id=guest_id, event_id=event.id).first_or_404()
    if not guest.qr_filename:
        generate_qr_for_guest(guest)
        db.session.commit()
    try:
        send_invitation(guest)
        log_action(
            "guest_resend",
            target_type="guest",
            target_id=guest.id,
            details=f"Приглашение повторно отправлено гостю '{guest.build_full_name()}'",
        )
        db.session.commit()
        flash("Приглашение повторно отправлено", "success")
    except Exception as e:
        log_action(
            "guest_resend",
            target_type="guest",
            target_id=guest.id,
            details=f"Ошибка повторной отправки приглашения гостю '{guest.build_full_name()}': {e}",
        )
        db.session.commit()
        flash(f"Ошибка отправки: {str(e)}", "danger")
    return redirect(url_for("main.admin_guests"))


@main_bp.route("/admin/guests/<int:guest_id>/ticket")
@require_role("admin", "organizer")
@require_event
def admin_guest_ticket(guest_id):
    """Генерирует и отдаёт PNG-билет для конкретного гостя."""
    event = get_current_event()
    guest = Guest.query.filter_by(id=guest_id, event_id=event.id).first_or_404()
    try:
        ticket_path = generate_ticket_image(guest, event)
        log_action(
            "guest_ticket_view",
            target_type="guest",
            target_id=guest.id,
            details=f"Просмотр билета гостя '{guest.build_full_name()}'",
        )
        db.session.commit()
        return send_file(str(ticket_path), mimetype="image/png")
    except Exception as e:
        flash(f"Ошибка генерации билета: {str(e)}", "danger")
        return redirect(url_for("main.admin_guests"))


@main_bp.route("/admin/guests/<int:guest_id>/qr")
@require_role("admin", "organizer")
@require_event
def admin_guest_qr(guest_id):
    """Отдаёт QR-код гостя без отправки письма."""
    event = get_current_event()
    guest = Guest.query.filter_by(id=guest_id, event_id=event.id).first_or_404()
    if not guest.qr_filename:
        generate_qr_for_guest(guest)
        db.session.commit()

    qr_path = safe_child_path(event_qr_folder(guest.event_id), guest.qr_filename)
    if not qr_path or not qr_path.exists():
        flash("QR-код не найден", "danger")
        return redirect(url_for("main.admin_guests"))

    log_action(
        "guest_qr_view",
        target_type="guest",
        target_id=guest.id,
        details=f"Просмотр QR-кода гостя '{guest.build_full_name()}'",
    )
    db.session.commit()
    return send_file(str(qr_path), mimetype="image/png")


@main_bp.route("/media/guests/<int:guest_id>/photo")
@require_role("admin", "organizer", "staff")
def guest_photo(guest_id):
    guest = db.get_or_404(Guest, guest_id)
    require_event_access(guest.event)
    paths = [path for path in guest._photo_paths() if path.is_file()]
    if not paths:
        abort(404)
    return send_file(paths[0], conditional=True, max_age=300)


@main_bp.route("/admin/send-invitations", methods=["POST"])
@require_role("admin", "organizer")
@require_event
def admin_send_invitations():
    event = get_current_event()
    try:
        _job, created = enqueue_event_invitations(event.id, current_user().id)
        flash("Рассылка поставлена в очередь." if created else "Рассылка уже выполняется.", "success" if created else "info")
    except Exception:
        current_app.logger.exception("Failed to enqueue event invitations")
        flash("Очередь рассылки недоступна. Обратитесь к администратору.", "danger")
    return redirect(url_for("main.admin_dashboard"))


# ---------------------------
# Reports
# ---------------------------

@main_bp.route("/admin/report")
@require_role("admin", "organizer")
@require_event
def admin_report():
    event = get_current_event()
    report_path = Path(current_app.config["UPLOAD_FOLDER"]) / "reports"
    report_path.mkdir(parents=True, exist_ok=True)
    filename = f"report_{event.id}_{datetime.now().strftime('%Y%m%d_%H%M%S')}.xlsx"
    output_path = report_path / filename

    try:
        export_report_to_excel(str(output_path), event_id=event.id, event_name=event.name)
        log_action(
            "event_report",
            target_type="event",
            target_id=event.id,
            details=f"Сформирован отчёт по мероприятию '{event.name}'",
        )
        db.session.commit()
        return send_file(str(output_path), as_attachment=True, download_name=filename)
    except Exception as e:
        flash(f"Ошибка формирования отчёта: {str(e)}", "danger")
        return redirect(url_for("main.admin_dashboard"))


# ---------------------------
# User management (admin only)
# ---------------------------

@main_bp.route("/admin/users")
@require_role("admin")
def admin_users():
    users = User.query.order_by(User.created_at.desc()).all()
    return render_template("admin/users.html", users=users)


@main_bp.route("/admin/users/add", methods=["GET", "POST"])
@require_role("admin")
def admin_user_add():
    if request.method == "POST":
        username = request.form.get("username", "").strip()
        password = request.form.get("password", "").strip()
        role = request.form.get("role", "staff").strip()

        if not username or not password:
            flash("Логин и пароль обязательны", "danger")
            return redirect(url_for("main.admin_user_add"))

        password_error = validate_password(password, current_app.config["MIN_PASSWORD_LENGTH"])
        if password_error:
            flash(password_error, "danger")
            return redirect(url_for("main.admin_user_add"))

        if role not in ("admin", "organizer", "staff"):
            flash("Неверная роль", "danger")
            return redirect(url_for("main.admin_user_add"))

        if User.query.filter_by(username=username).first():
            flash("Пользователь с таким логином уже существует", "danger")
            return redirect(url_for("main.admin_user_add"))

        user = User(username=username, role=role, is_active=True)
        user.set_password(password)
        db.session.add(user)
        log_action("user_create", target_type="user", target_id=user.id, details=f"Создан пользователь '{username}' ({role})")
        db.session.commit()
        flash(f"Пользователь {username} создан", "success")
        return redirect(url_for("main.admin_users"))

    return render_template("admin/user_form.html", user=None)


@main_bp.route("/admin/users/<int:user_id>/edit", methods=["GET", "POST"])
@require_role("admin")
def admin_user_edit(user_id):
    user = User.query.get_or_404(user_id)
    if request.method == "POST":
        username = request.form.get("username", "").strip()
        password = request.form.get("password", "").strip()
        role = request.form.get("role", user.role).strip()
        is_active = bool(request.form.get("is_active"))

        if not username:
            flash("Логин обязателен", "danger")
            return redirect(url_for("main.admin_user_edit", user_id=user.id))

        if role not in ("admin", "organizer", "staff"):
            flash("Неверная роль", "danger")
            return redirect(url_for("main.admin_user_edit", user_id=user.id))

        existing = User.query.filter(User.username == username, User.id != user.id).first()
        if existing:
            flash("Пользователь с таким логином уже существует", "danger")
            return redirect(url_for("main.admin_user_edit", user_id=user.id))

        user.username = username
        user.role = role
        user.is_active = is_active
        if password:
            password_error = validate_password(password, current_app.config["MIN_PASSWORD_LENGTH"])
            if password_error:
                flash(password_error, "danger")
                return redirect(url_for("main.admin_user_edit", user_id=user.id))
            user.set_password(password)
        log_action("user_update", target_type="user", target_id=user.id, details=f"Обновлён пользователь '{username}' ({role})")
        db.session.commit()
        flash("Пользователь обновлён", "success")
        return redirect(url_for("main.admin_users"))

    return render_template("admin/user_form.html", user=user)


@main_bp.route("/admin/users/<int:user_id>/delete", methods=["POST"])
@require_role("admin")
def admin_user_delete(user_id):
    user = User.query.get_or_404(user_id)
    if user.id == current_user().id:
        flash("Нельзя удалить самого себя", "danger")
        return redirect(url_for("main.admin_users"))

    user.is_active = False
    log_action("user_deactivate", target_type="user", target_id=user.id, details=f"Пользователь '{user.username}' заблокирован")
    db.session.commit()
    flash("Пользователь заблокирован", "success")
    return redirect(url_for("main.admin_users"))


@main_bp.route("/admin/logs")
@require_role("admin")
def admin_logs():
    page = request.args.get("page", 1, type=int)
    per_page = 50
    action_filter = request.args.get("action", "").strip()
    user_filter = request.args.get("user", "").strip()

    query = AuditLog.query
    if action_filter:
        query = query.filter(AuditLog.action == action_filter)
    if user_filter:
        query = query.filter(AuditLog.username.ilike(f"%{user_filter}%"))

    logs = query.order_by(AuditLog.created_at.desc()).paginate(
        page=page, per_page=per_page, error_out=False
    )
    actions = db.session.query(AuditLog.action).distinct().order_by(AuditLog.action).all()
    actions = [a[0] for a in actions]

    return render_template(
        "admin/logs.html",
        logs=logs,
        actions=actions,
        action_filter=action_filter,
        user_filter=user_filter,
    )


# ---------------------------
# Admin panel
# ---------------------------

@main_bp.route("/admin/panel")
@require_role("admin", "organizer", "staff")
def admin_panel():
    """Единая админ-панель со ссылками на все разделы."""
    user = current_user()
    event = get_current_event() if user and (user.is_admin or user.is_organizer) else None

    cards = []
    if user and user.role in ("admin", "organizer"):
        cards.extend([
            {
                "title": "Мероприятия",
                "description": "Создание и управление мероприятиями",
                "url": url_for("main.admin_events"),
                "icon": "📅",
                "btn": "Перейти",
            },
            {
                "title": "Гости",
                "description": "Список гостей, поиск, редактирование",
                "url": url_for("main.admin_guests") if event else url_for("main.admin_events"),
                "icon": "👥",
                "btn": "Перейти",
                "disabled": not event,
            },
            {
                "title": "Загрузка данных",
                "description": "Импорт гостей из Excel и загрузка фото",
                "url": url_for("main.admin_upload") if event else url_for("main.admin_events"),
                "icon": "📤",
                "btn": "Перейти",
                "disabled": not event,
            },
            {
                "title": "Рассылка приглашений",
                "description": "Настройка почты и массовая отправка",
                "url": url_for("main.admin_email_send"),
                "icon": "✉️",
                "btn": "Перейти",
            },
            {
                "title": "Конструктор билета",
                "description": "Дизайн, логотип и предпросмотр билета",
                "url": url_for("main.admin_event_ticket", event_id=event.id) if event else url_for("main.admin_events"),
                "icon": "🎫",
                "btn": "Перейти",
                "disabled": not event,
            },
            {
                "title": "Аналитика",
                "description": "Посещаемость и недавние входы",
                "url": url_for("main.admin_dashboard") if event else url_for("main.admin_events"),
                "icon": "📊",
                "btn": "Перейти",
                "disabled": not event,
            },
        ])

    if user and user.is_admin:
        cards.extend([
            {
                "title": "Пользователи",
                "description": "Управление администраторами и стаффом",
                "url": url_for("main.admin_users"),
                "icon": "🔐",
                "btn": "Перейти",
            },
            {
                "title": "Логи",
                "description": "История действий пользователей",
                "url": url_for("main.admin_logs"),
                "icon": "📝",
                "btn": "Перейти",
            },
        ])

    cards.append({
        "title": "Проверка приглашения",
        "description": "Сканирование QR-кода и отметка входа",
        "url": url_for("main.check_in"),
        "icon": "📷",
        "btn": "Перейти",
    })

    return render_template("admin/panel.html", cards=cards)


# ---------------------------
# Email / invitations
# ---------------------------

@main_bp.route("/admin/email/settings", methods=["GET", "POST"])
@require_role("admin")
def admin_email_settings():
    settings = SmtpSettings.get_settings()

    if request.method == "POST":
        mode = request.form.get("mail_mode", "smtp").strip()
        settings.use_local_outlook = mode == "outlook"
        settings.use_ews = mode == "ews"

        if mode == "smtp":
            settings.mail_server = request.form.get("mail_server", "smtp.yandex.ru").strip()
            try:
                settings.mail_port = int(request.form.get("mail_port", "465").strip())
            except ValueError:
                settings.mail_port = 465
            settings.mail_use_ssl = bool(request.form.get("mail_use_ssl"))
            settings.mail_username = request.form.get("mail_username", "").strip()
            settings.mail_default_sender = request.form.get("mail_default_sender", "").strip()

            password = request.form.get("mail_password", "").strip()
            if password:
                settings.set_mail_password(password)

        elif mode == "ews":
            settings.ews_url = request.form.get("ews_url", "").strip()
            settings.mail_username = request.form.get("mail_username", "").strip()
            settings.mail_default_sender = request.form.get("mail_default_sender", "").strip()

            password = request.form.get("mail_password", "").strip()
            if password:
                settings.set_mail_password(password)

        # IMAP: копия отправленных писем (общая для всех режимов отправки)
        settings.imap_save_copy = bool(request.form.get("imap_save_copy"))
        settings.imap_server = request.form.get("imap_server", "").strip()
        try:
            settings.imap_port = int(request.form.get("imap_port", "993").strip())
        except ValueError:
            settings.imap_port = 993
        settings.imap_use_ssl = bool(request.form.get("imap_use_ssl"))
        settings.imap_username = request.form.get("imap_username", "").strip()
        settings.imap_folder = request.form.get("imap_folder", "Sent").strip() or "Sent"

        imap_password = request.form.get("imap_password", "").strip()
        if imap_password:
            settings.set_imap_password(imap_password)

        db.session.commit()
        SmtpSettings.apply_to_app(current_app)

        mode_label = {"smtp": "SMTP", "ews": "EWS", "outlook": "Outlook"}.get(mode, mode)
        log_action(
            "email_settings_update",
            target_type="smtp_settings",
            target_id=settings.id,
            details=f"Обновлены почтовые настройки ({mode_label})",
        )
        db.session.commit()

        flash("Настройки почты сохранены", "success")
        return redirect(url_for("main.admin_email_settings"))

    return render_template("admin/email_settings.html", settings=settings)


@main_bp.route("/admin/email/test", methods=["POST"])
@require_role("admin")
@limiter.limit("5 per minute")
def admin_email_test():
    test_address = request.form.get("test_address", "").strip()
    if not test_address:
        flash("Укажите адрес для тестового письма", "danger")
        return redirect(url_for("main.admin_email_settings"))

    try:
        send_test_email(test_address)
        log_action(
            "email_test_send",
            target_type="smtp_settings",
            details=f"Тестовое письмо отправлено на {test_address}",
        )
        db.session.commit()
        flash(f"Тестовое письмо отправлено на {test_address}", "success")
    except Exception as e:
        log_action(
            "email_test_send",
            target_type="smtp_settings",
            details=f"Ошибка отправки тестового письма на {test_address}: {e}",
        )
        db.session.commit()
        flash(f"Ошибка отправки: {str(e)}", "danger")

    return redirect(url_for("main.admin_email_settings"))


@main_bp.route("/admin/email/send", methods=["GET", "POST"])
@require_role("admin", "organizer")
@limiter.limit("3 per minute", methods=["POST"])
def admin_email_send():
    user = current_user()
    events = available_events_for_user(user).all()

    if request.method == "POST":
        event_id = request.form.get("event_id", "").strip()
        if not event_id:
            flash("Выберите мероприятие", "danger")
            return redirect(url_for("main.admin_email_send"))

        event = db.get_or_404(Event, int(event_id))
        if not user.can_manage_event(event):
            flash("Нет доступа к этому мероприятию", "danger")
            return redirect(url_for("main.admin_email_send"))

        unsent_count = Guest.query.filter_by(
            event_id=event.id, is_active=True, invitation_sent=False
        ).count()

        if not unsent_count:
            flash("Нет неотправленных приглашений для выбранного мероприятия", "info")
            return redirect(url_for("main.admin_email_send"))

        try:
            _job, created = enqueue_event_invitations(event.id, user.id)
            flash(f"Рассылка для {unsent_count} гостей поставлена в очередь." if created else "Рассылка уже выполняется.", "success" if created else "info")
        except Exception:
            current_app.logger.exception("Failed to enqueue event invitations")
            flash("Очередь рассылки недоступна. Обратитесь к администратору.", "danger")
        return redirect(url_for("main.admin_email_send"))

    event_counts = []
    for event in events:
        unsent = Guest.query.filter_by(
            event_id=event.id, is_active=True, invitation_sent=False
        ).count()
        failed = Guest.query.filter_by(event_id=event.id, is_active=True, invitation_status="failed").count()
        event_counts.append({"event": event, "unsent": unsent, "failed": failed})

    return render_template("admin/email_send.html", event_counts=event_counts)


# ---------------------------
# Check-in
# ---------------------------

@main_bp.route("/check-in", methods=["GET", "POST"])
@require_role("admin", "organizer", "staff")
def check_in():
    user = current_user()
    token = request.args.get("token", "").strip()
    guest = None
    already_checked_in = False

    active_events = available_events_for_user(user).filter(Event.is_active == True).all()

    if request.method == "POST":
        event_id = request.form.get("event_id", "").strip()
        if event_id:
            try:
                selected_event = db.session.get(Event, int(event_id))
                if not selected_event or not selected_event.is_active or not can_access_event(user, selected_event):
                    abort(403)
                session["checkin_event_id"] = selected_event.id
            except ValueError:
                pass
        return redirect(url_for("main.check_in", token=token))

    checkin_event_id = session.get("checkin_event_id")
    checkin_event = None
    if checkin_event_id:
        checkin_event = db.session.get(Event, checkin_event_id)
        if not checkin_event or not can_access_event(user, checkin_event):
            session.pop("checkin_event_id", None)
            checkin_event = None

    if token:
        guest = Guest.query.filter_by(token=token, is_active=True).first()
        if guest and can_access_event(user, guest.event):
            already_checked_in = guest.is_checked_in
            if checkin_event is None:
                checkin_event = guest.event
                session["checkin_event_id"] = guest.event_id
        else:
            guest = None

    return render_template(
        "checkin/index.html",
        guest=guest,
        token=token,
        already_checked_in=already_checked_in,
        active_events=active_events,
        checkin_event=checkin_event,
    )


# ---------------------------
# API
# ---------------------------

@main_bp.route("/api/guests/search")
@require_role("admin", "organizer", "staff")
@limiter.limit("60 per minute")
def api_guests_search():
    q = request.args.get("q", "").strip()
    event_id = request.args.get("event_id") or session.get("checkin_event_id")

    if len(q) < 2:
        return jsonify([])

    if not event_id:
        return jsonify({"error": "Сначала выберите мероприятие"}), 400

    try:
        event = db.session.get(Event, int(event_id))
    except (TypeError, ValueError):
        event = None
    if not event or not can_access_event(current_user(), event):
        abort(403)

    query = Guest.query.filter(Guest.is_active == True, Guest.event_id == event.id)

    # Ограничиваем выборку на уровне БД, чтобы поиск не загружал в память
    # весь список гостей крупного мероприятия.
    guests = (
        query
        .options(selectinload(Guest.check_ins))
        .filter(_guest_search_expression(q))
        .order_by(Guest.full_name)
        .limit(20)
        .all()
    )

    return jsonify([
        {
            "id": g.id,
            "full_name": g.build_full_name(),
            "department": g.department,
            "position": g.position,
            "email": g.email,
            "phone": g.phone,
            "photo_url": g.photo_url,
            "token": g.token,
            "checked_in": g.is_checked_in,
            "event_id": g.event_id,
            "event_name": g.event.name if g.event else "",
        }
        for g in guests
    ])


@main_bp.route("/api/check-in/<token>", methods=["POST"])
@require_role("admin", "organizer", "staff")
@limiter.limit("120 per minute")
def api_check_in(token):
    guest = Guest.query.filter_by(token=token, is_active=True).first()
    if not guest:
        return jsonify({"success": False, "message": "Гость не найден или QR-код аннулирован"}), 404
    require_event_access(guest.event)

    if guest.is_checked_in:
        return jsonify({
            "success": False,
            "already_checked_in": True,
            "checked_in_at": guest.last_check_in.isoformat(),
            "message": "Гость уже отмечен как вошедший",
        }), 409

    check_in_record = CheckIn(
        guest_id=guest.id,
        event_id=guest.event_id,
        checked_in_by_id=current_user().id,
        device_info=request.headers.get("User-Agent", "")[:500],
    )
    db.session.add(check_in_record)
    log_action(
        "check_in",
        target_type="guest",
        target_id=guest.id,
        details=f"Отмечен вход гостя '{guest.build_full_name()}' на мероприятие '{guest.event.name if guest.event else ''}'",
    )
    try:
        db.session.commit()
    except IntegrityError:
        db.session.rollback()
        existing = CheckIn.query.filter_by(guest_id=guest.id).first()
        return jsonify({
            "success": False,
            "already_checked_in": True,
            "checked_in_at": existing.checked_in_at.isoformat() if existing else None,
            "message": "Гость уже отмечен как вошедший",
        }), 409

    return jsonify({
        "success": True,
        "message": "Вход отмечен",
        "checked_in_at": check_in_record.checked_in_at.isoformat(),
        "guest": {
            "full_name": guest.build_full_name(),
            "department": guest.department,
            "position": guest.position,
            "phone": guest.phone,
        },
    })


@main_bp.route("/api/check-in/<token>/undo", methods=["POST"])
@require_role("admin", "organizer", "staff")
@limiter.limit("30 per minute")
def api_check_in_undo(token):
    guest = Guest.query.filter_by(token=token, is_active=True).first()
    if not guest:
        return jsonify({"success": False, "message": "Гость не найден"}), 404
    require_event_access(guest.event)
    payload = request.get_json(silent=True) or request.form
    reason = str(payload.get("reason", "")).strip()
    if len(reason) < 3:
        return jsonify({"success": False, "message": "Укажите причину отмены"}), 400
    record = CheckIn.query.filter_by(guest_id=guest.id).first()
    if not record:
        return jsonify({"success": False, "message": "Активная отметка входа не найдена"}), 409
    checked_in_at = record.checked_in_at
    db.session.delete(record)
    log_action(
        "check_in_undo", target_type="guest", target_id=guest.id,
        details=f"Отменён вход от {checked_in_at.isoformat()}. Причина: {reason[:500]}",
    )
    db.session.commit()
    return jsonify({"success": True, "message": "Отметка входа отменена"})


@main_bp.route("/api/guest/<token>")
@require_role("admin", "organizer", "staff")
@limiter.limit("120 per minute")
def api_guest_detail(token):
    guest = Guest.query.filter_by(token=token, is_active=True).first_or_404()
    require_event_access(guest.event)
    return jsonify({
        "id": guest.id,
        "full_name": guest.build_full_name(),
        "department": guest.department,
        "position": guest.position,
        "email": guest.email,
        "phone": guest.phone,
        "photo_url": guest.photo_url,
        "token": guest.token,
        "checked_in": guest.is_checked_in,
        "checked_in_at": guest.last_check_in.isoformat() if guest.last_check_in else None,
        "event_id": guest.event_id,
        "event_name": guest.event.name if guest.event else "",
    })


# ---------------------------
# Home
# ---------------------------

@main_bp.route("/")
def index():
    if _is_first_run():
        return redirect(url_for("main.setup" if _setup_available() else "main.login"))

    user = current_user()
    if not user:
        return redirect(url_for("main.login"))
    if user.is_staff:
        return redirect(url_for("main.check_in"))
    return redirect(url_for("main.admin_panel"))


@main_bp.app_context_processor
def inject_globals():
    user = current_user()
    events = []
    current_event = None
    if user and (user.is_admin or user.is_organizer):
        events = available_events_for_user(user).filter(Event.is_active == True).all()
        event_id = session.get("current_event_id")
        if event_id:
            candidate = db.session.get(Event, event_id)
            if candidate and user.can_manage_event(candidate):
                current_event = candidate
            else:
                session.pop("current_event_id", None)
    return dict(current_user=user, available_events=events, current_event=current_event)