from datetime import datetime, timedelta
from telegram import InlineKeyboardButton, InlineKeyboardMarkup, Update
from telegram.ext import ContextTypes
from asgiref.sync import sync_to_async
from hotels.models import Reservation, Hotel
from users.models import User

from bot.utils.pdf_report import generate_pdf_report
from bot.utils.database import get_hotels_for_user, get_hotel_by_name


async def statistics(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Вывод списка отелей для статистики."""
    query = update.callback_query
    user_id = query.from_user.id
    await query.answer()

    # Получаем пользователя
    user = await sync_to_async(User.objects.filter(chat_id=user_id).first)()
    if not user:
        await query.edit_message_text("Вы не зарегистрированы в системе.")
        return

    # Получаем отели, связанные с пользователем
    user_hotels = await get_hotels_for_user(user)
    if not user_hotels:
        await query.edit_message_text("У вас нет доступных отелей для статистики.")
        return

    # Формируем кнопки для выбора отеля
    keyboard = [
        [InlineKeyboardButton(hotel.hotel.name, callback_data=f"stats_hotel_{hotel.hotel.id}")]
        for hotel in user_hotels
    ]
    keyboard.append([InlineKeyboardButton("🏠 Главная", callback_data="main_menu")])
    reply_markup = InlineKeyboardMarkup(keyboard)
    await query.edit_message_text("Выберите отель:", reply_markup=reply_markup)

async def stats_select_period(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Выбор периода времени для статистики."""
    query = update.callback_query
    await query.answer()

    hotel_id = int(query.data.split("_")[2])
    context.user_data["selected_hotel"] = hotel_id

    keyboard = [
        [InlineKeyboardButton("Неделя", callback_data="stats_period_week")],
        [InlineKeyboardButton("Месяц", callback_data="stats_period_month")],
        [InlineKeyboardButton("Все время", callback_data="stats_period_all")],
        [InlineKeyboardButton("🏠 Главная", callback_data="main_menu")],
        [InlineKeyboardButton("🔙 Назад", callback_data="statistics")],
    ]
    reply_markup = InlineKeyboardMarkup(keyboard)
    await query.edit_message_text("Выберите период времени:", reply_markup=reply_markup)

async def generate_statistics(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Генерация и отправка статистики."""
    query = update.callback_query
    await query.answer()

    hotel_id = context.user_data.get("selected_hotel")
    if not hotel_id:
        await query.edit_message_text("Ошибка: ID отеля не найден.")
        return

    period = query.data.split("_")[2]

    now = datetime.now()
    if period == "week":
        start_date = now - timedelta(days=7)
        end_date = now
    elif period == "month":
        start_date = now - timedelta(days=30)
        end_date = now
    else:
        start_date = None
        end_date = None

    reservations = await sync_to_async(list)(
        Reservation.objects.filter(hotel_id=hotel_id).prefetch_related('guests')
    )

    if not reservations:
        await query.edit_message_text("Нет данных для статистики за выбранный период.")
        return

    hotel = await sync_to_async(Hotel.objects.get)(id=hotel_id)
    file_path = generate_pdf_report(hotel.name, reservations, start_date, end_date)

    with open(file_path, "rb") as file:
        await query.message.reply_document(document=file, filename=f"{hotel.name}_report.pdf")


async def stats_back(update: Update, context):
    """Возврат к выбору отеля."""
    query = update.callback_query
    await query.answer()

    # Получаем отели, связанные с пользователем
    user_id = query.from_user.id
    user = await sync_to_async(User.objects.filter(chat_id=user_id).first)()
    if not user:
        await query.edit_message_text("Ошибка: Пользователь не найден.")
        return

    hotels = await get_hotels_for_user(user)
    if not hotels:
        await query.edit_message_text("У вас нет доступных отелей.")
        return

    # Формируем кнопки для выбора отеля
    keyboard = [
        [InlineKeyboardButton(hotel.name, callback_data=f"stats_hotel_{hotel.id}")]
        for hotel in hotels
    ]
    keyboard.append([InlineKeyboardButton("🏠 Главная", callback_data="main_menu")])
    reply_markup = InlineKeyboardMarkup(keyboard)
    await query.edit_message_text("Выберите отель:", reply_markup=reply_markup)