from pathlib import Path
from openpyxl import load_workbook, Workbook
from openpyxl.styles import Font, PatternFill, Alignment
from app import db
from app.models import Guest


REQUIRED_COLUMNS = ["Отдел", "Фамилия", "Имя", "Отчество", "Должность", "Почта", "Телефон", "Название фото"]


def _build_full_name(last_name, first_name, middle_name):
    parts = [p for p in [last_name, first_name, middle_name] if p]
    return " ".join(parts)


def read_guests_from_excel(file_path):
    """Читает список гостей из Excel-файла (путь или файловый объект)."""
    if not hasattr(file_path, "read"):
        file_path = Path(file_path)
    wb = load_workbook(file_path, data_only=True)
    try:
        ws = wb.active

        # Определяем заголовки и сразу считываем все строки
        headers = [str(cell.value).strip() if cell.value else "" for cell in ws[1]]
        rows = list(ws.iter_rows(min_row=2, values_only=True))
    finally:
        wb.close()

    missing = [col for col in REQUIRED_COLUMNS if col not in headers]
    if missing:
        raise ValueError(f"В файле отсутствуют обязательные столбцы: {', '.join(missing)}")

    col_indices = {col: headers.index(col) for col in REQUIRED_COLUMNS}
    guests_data = []

    for row in rows:
        last_name = str(row[col_indices["Фамилия"]]).strip() if row[col_indices["Фамилия"]] else ""
        first_name = str(row[col_indices["Имя"]]).strip() if row[col_indices["Имя"]] else ""
        middle_name = str(row[col_indices["Отчество"]]).strip() if row[col_indices["Отчество"]] else ""
        email = str(row[col_indices["Почта"]]).strip() if row[col_indices["Почта"]] else ""

        if not email:
            continue

        full_name = _build_full_name(last_name, first_name, middle_name)
        if not full_name:
            # Если ФИО не заполнено, но есть email — пропускаем строку
            continue

        guests_data.append({
            "department": str(row[col_indices["Отдел"]]).strip() if row[col_indices["Отдел"]] else "",
            "last_name": last_name,
            "first_name": first_name,
            "middle_name": middle_name,
            "full_name": full_name,
            "position": str(row[col_indices["Должность"]]).strip() if row[col_indices["Должность"]] else "",
            "email": email,
            "phone": str(row[col_indices["Телефон"]]).strip() if row[col_indices["Телефон"]] else "",
            "photo_filename": str(row[col_indices["Название фото"]]).strip() if row[col_indices["Название фото"]] else "",
        })

    return guests_data


def import_guests_from_excel(file_path, event_id):
    """Импортирует гостей из Excel в базу данных в рамках указанного мероприятия."""
    if not event_id:
        raise ValueError("Не выбрано мероприятие для импорта")

    guests_data = read_guests_from_excel(file_path)
    imported = 0
    updated = 0

    for data in guests_data:
        guest = Guest.query.filter_by(event_id=event_id, email=data["email"]).first()
        if guest:
            guest.department = data["department"]
            guest.last_name = data["last_name"]
            guest.first_name = data["first_name"]
            guest.middle_name = data["middle_name"]
            guest.full_name = data["full_name"]
            guest.position = data["position"]
            guest.phone = data["phone"]
            guest.photo_filename = data["photo_filename"]
            guest.is_active = True
            updated += 1
        else:
            guest = Guest(
                event_id=event_id,
                department=data["department"],
                last_name=data["last_name"],
                first_name=data["first_name"],
                middle_name=data["middle_name"],
                full_name=data["full_name"],
                position=data["position"],
                email=data["email"],
                phone=data["phone"],
                photo_filename=data["photo_filename"],
            )
            db.session.add(guest)
            imported += 1

    db.session.commit()
    return {"imported": imported, "updated": updated, "total": len(guests_data)}


def export_report_to_excel(output_path, event_id, event_name=None):
    """Выгружает отчёт о посещаемости для мероприятия в Excel."""
    if not event_id:
        raise ValueError("Не выбрано мероприятие для отчёта")

    guests = Guest.query.filter_by(event_id=event_id).order_by(Guest.department, Guest.full_name).all()

    wb = Workbook()
    ws = wb.active
    ws.title = "Отчёт"

    headers = [
        "Мероприятие", "Отдел", "Фамилия", "Имя", "Отчество",
        "Должность", "Email", "Телефон", "Название фото", "Статус", "Время входа"
    ]
    ws.append(headers)

    # Стили заголовков
    for cell in ws[1]:
        cell.font = Font(bold=True)
        cell.fill = PatternFill(start_color="DDDDDD", end_color="DDDDDD", fill_type="solid")
        cell.alignment = Alignment(horizontal="center")

    for guest in guests:
        status = "Пришёл" if guest.is_checked_in else "Не пришёл"
        check_in_time = guest.last_check_in.strftime("%d.%m.%Y %H:%M:%S") if guest.last_check_in else ""
        ws.append([
            event_name or "",
            guest.department,
            guest.last_name or "",
            guest.first_name or "",
            guest.middle_name or "",
            guest.position or "",
            guest.email,
            guest.phone or "",
            guest.photo_filename or "",
            status,
            check_in_time,
        ])

    # Автоширина колонок
    for column in ws.columns:
        max_length = 0
        column_letter = column[0].column_letter
        for cell in column:
            try:
                if cell.value:
                    max_length = max(max_length, len(str(cell.value)))
            except Exception:
                pass
        ws.column_dimensions[column_letter].width = min(max_length + 2, 50)

    wb.save(output_path)
    return output_path