"""Handler for AuraPay balance top-up."""

import html

import structlog
from aiogram import types
from aiogram.fsm.context import FSMContext
from aiogram.types import InlineKeyboardButton, InlineKeyboardMarkup
from sqlalchemy.ext.asyncio import AsyncSession

from app.config import settings
from app.database.models import User
from app.keyboards.inline import get_back_keyboard
from app.localization.texts import get_texts
from app.services.payment_service import PaymentService
from app.states import BalanceStates
from app.utils.decorators import error_handler


logger = structlog.get_logger(__name__)


def _check_topup_restriction(db_user: User, texts) -> InlineKeyboardMarkup | None:
    """Проверяет ограничение на пополнение. Возвращает клавиатуру если ограничен, иначе None."""
    if not getattr(db_user, 'restriction_topup', False):
        return None

    keyboard = []
    support_url = settings.get_support_contact_url()
    if support_url:
        keyboard.append([InlineKeyboardButton(text='\U0001f198 Обжаловать', url=support_url)])
    keyboard.append([InlineKeyboardButton(text=texts.BACK, callback_data='menu_balance')])
    return InlineKeyboardMarkup(inline_keyboard=keyboard)


async def _create_aurapay_payment_and_respond(
    message_or_callback,
    db_user: User,
    db: AsyncSession,
    amount_kopeks: int,
    edit_message: bool = False,
    payment_method_type: str | None = None,
):
    """
    Common logic for creating AuraPay payment and sending response.
    """
    texts = get_texts(db_user.language)
    amount_rub = amount_kopeks / 100

    # Create payment
    payment_service = PaymentService()

    description = settings.PAYMENT_BALANCE_TEMPLATE.format(
        service_name=settings.PAYMENT_SERVICE_NAME,
        description='Пополнение баланса',
    )

    result = await payment_service.create_aurapay_payment(
        db=db,
        user_id=db_user.id,
        amount_kopeks=amount_kopeks,
        description=description,
        email=getattr(db_user, 'email', None),
        language=db_user.language,
        payment_method_type=payment_method_type,
    )

    if not result:
        error_text = texts.t(
            'PAYMENT_CREATE_ERROR',
            'Не удалось создать платёж. Попробуйте позже.',
        )
        if edit_message:
            await message_or_callback.edit_text(
                error_text,
                reply_markup=get_back_keyboard(db_user.language),
                parse_mode='HTML',
            )
        else:
            await message_or_callback.answer(
                error_text,
                parse_mode='HTML',
            )
        return

    payment_url = result.get('payment_url')
    display_name = settings.get_aurapay_display_name()

    # Create keyboard with payment button
    keyboard = InlineKeyboardMarkup(
        inline_keyboard=[
            [
                InlineKeyboardButton(
                    text=texts.t(
                        'PAY_BUTTON',
                        '\U0001f4b3 Оплатить {amount}\u20bd',
                    ).format(amount=f'{amount_rub:.0f}'),
                    url=payment_url,
                )
            ],
            [
                InlineKeyboardButton(
                    text=texts.t('BACK_BUTTON', '\u25c0\ufe0f Назад'),
                    callback_data='menu_balance',
                )
            ],
        ]
    )

    response_text = texts.t(
        'AURAPAY_PAYMENT_CREATED',
        '\U0001f4b3 <b>Оплата через {name}</b>\n\n'
        'Сумма: <b>{amount}\u20bd</b>\n\n'
        'Нажмите кнопку ниже для оплаты.\n'
        'После успешной оплаты баланс будет пополнен автоматически.',
    ).format(name=display_name, amount=f'{amount_rub:.2f}')

    if edit_message:
        await message_or_callback.edit_text(
            response_text,
            reply_markup=keyboard,
            parse_mode='HTML',
        )
    else:
        await message_or_callback.answer(
            response_text,
            reply_markup=keyboard,
            parse_mode='HTML',
        )

    logger.info('AuraPay payment created', telegram_id=db_user.telegram_id, amount_rub=amount_rub)


@error_handler
async def process_aurapay_payment_amount(
    message: types.Message,
    db_user: User,
    db: AsyncSession,
    amount_kopeks: int,
    state: FSMContext,
):
    """
    Process payment amount directly.
    """
    texts = get_texts(db_user.language)

    restriction_kb = _check_topup_restriction(db_user, texts)
    if restriction_kb:
        reason = html.escape(getattr(db_user, 'restriction_reason', None) or 'Действие ограничено администратором')
        await message.answer(
            f'\U0001f6ab <b>Пополнение ограничено</b>\n\n{reason}',
            parse_mode='HTML',
            reply_markup=restriction_kb,
        )
        await state.clear()
        return

    # Validate amount
    min_amount = settings.AURAPAY_MIN_AMOUNT_KOPEKS
    max_amount = settings.AURAPAY_MAX_AMOUNT_KOPEKS

    if amount_kopeks < min_amount:
        await message.answer(
            texts.t(
                'PAYMENT_AMOUNT_TOO_LOW',
                'Минимальная сумма пополнения: {min_amount}\u20bd',
            ).format(min_amount=min_amount // 100),
            reply_markup=get_back_keyboard(db_user.language),
            parse_mode='HTML',
        )
        return

    if amount_kopeks > max_amount:
        await message.answer(
            texts.t(
                'PAYMENT_AMOUNT_TOO_HIGH',
                'Максимальная сумма пополнения: {max_amount}\u20bd',
            ).format(max_amount=max_amount // 100),
            reply_markup=get_back_keyboard(db_user.language),
            parse_mode='HTML',
        )
        return

    data = await state.get_data()
    payment_method = data.get('payment_method', 'aurapay')
    # aurapay_sbp → 'sbp', aurapay_card → 'card', aurapay → None
    payment_method_type = _extract_service_type(payment_method)

    await state.clear()

    await _create_aurapay_payment_and_respond(
        message_or_callback=message,
        db_user=db_user,
        db=db,
        amount_kopeks=amount_kopeks,
        edit_message=False,
        payment_method_type=payment_method_type,
    )


AURAPAY_PAYMENT_METHODS = {'aurapay', 'aurapay_sbp', 'aurapay_card'}

AURAPAY_SERVICE_MAP: dict[str, str | None] = {
    'aurapay': None,
    'aurapay_sbp': 'sbp',
    'aurapay_card': 'card',
}


def _extract_service_type(payment_method: str) -> str | None:
    return AURAPAY_SERVICE_MAP.get(payment_method)


async def _start_aurapay_topup_impl(
    callback: types.CallbackQuery,
    db_user: User,
    state: FSMContext,
    payment_method: str,
):
    """Common logic for starting AuraPay top-up (generic / SBP / card)."""
    texts = get_texts(db_user.language)

    restriction_kb = _check_topup_restriction(db_user, texts)
    if restriction_kb:
        reason = html.escape(getattr(db_user, 'restriction_reason', None) or 'Действие ограничено администратором')
        await callback.message.edit_text(
            f'\U0001f6ab <b>Пополнение ограничено</b>\n\n{reason}',
            parse_mode='HTML',
            reply_markup=restriction_kb,
        )
        return

    await state.set_state(BalanceStates.waiting_for_amount)
    await state.update_data(payment_method=payment_method)

    min_amount = settings.AURAPAY_MIN_AMOUNT_KOPEKS // 100
    max_amount = settings.AURAPAY_MAX_AMOUNT_KOPEKS // 100

    # Choose display name based on sub-method
    if payment_method == 'aurapay_sbp':
        display_name = settings.get_aurapay_sbp_display_name()
    elif payment_method == 'aurapay_card':
        display_name = settings.get_aurapay_card_display_name()
    else:
        display_name = settings.get_aurapay_display_name()

    keyboard = InlineKeyboardMarkup(
        inline_keyboard=[
            [
                InlineKeyboardButton(
                    text=texts.t('BACK_BUTTON', '\u25c0\ufe0f Назад'),
                    callback_data='menu_balance',
                )
            ]
        ]
    )

    await callback.message.edit_text(
        texts.t(
            'AURAPAY_ENTER_AMOUNT',
            '\U0001f4b3 <b>Пополнение через {name}</b>\n\n'
            'Введите сумму пополнения в рублях.\n\n'
            'Минимум: {min_amount}\u20bd\n'
            'Максимум: {max_amount}\u20bd',
        ).format(
            name=display_name,
            min_amount=min_amount,
            max_amount=f'{max_amount:,}'.replace(',', ' '),
        ),
        parse_mode='HTML',
        reply_markup=keyboard,
    )


@error_handler
async def start_aurapay_topup(
    callback: types.CallbackQuery,
    db_user: User,
    db: AsyncSession,
    state: FSMContext,
):
    await _start_aurapay_topup_impl(callback, db_user, state, 'aurapay')


@error_handler
async def start_aurapay_sbp_topup(
    callback: types.CallbackQuery,
    db_user: User,
    db: AsyncSession,
    state: FSMContext,
):
    await _start_aurapay_topup_impl(callback, db_user, state, 'aurapay_sbp')


@error_handler
async def start_aurapay_card_topup(
    callback: types.CallbackQuery,
    db_user: User,
    db: AsyncSession,
    state: FSMContext,
):
    await _start_aurapay_topup_impl(callback, db_user, state, 'aurapay_card')