# Aiogram
import aiogram.types as types
from aiogram.fsm.context import FSMContext
from aiogram.filters import CommandObject, CommandStart, StateFilter
from aiogram import Router

# Utils
from utils.text_tools import to_html
from utils.amount_parser import format_rub_amount

# Const
from create_bot import orm
from services.wata import WataAPIError, WataClient

# States
from states.client_states import MainStates

# Another
from datetime import datetime, timezone
import logging


# Init
start_router = Router()
logger = logging.getLogger(__name__)
wata_client = WataClient()


@start_router.message(CommandStart(), StateFilter("*"))
async def cmd_start(
    message: types.Message, state: FSMContext, command: CommandObject | None = None
):

    if message.chat.type != "private":
        return

    await register_user(message)

    command_args = command.args if command else None
    if command_args and command_args.startswith("payment_failed_"):
        order_id = command_args.removeprefix("payment_failed_")
        await show_payment_result(message, state, order_id)
        return

    if command_args and command_args.startswith("payment_"):
        order_id = command_args.removeprefix("payment_")
        await show_payment_result(message, state, order_id)
        return

    await state.set_state(MainStates.waiting_amount)
    await message.answer(
        text=(
            "Для продолжения работы укажите сумму оплаты в рублях, "
            "и я отправлю ссылку для безопасной оплаты.\n\n"
            "Отправьте сумму сообщением."
        ),
        reply_markup=types.ReplyKeyboardRemove(),
    )


async def register_user(message: types.Message) -> None:
    user_id = message.from_user.id
    username = (
        "@" + message.from_user.username
        if message.from_user.username is not None
        else None
    )
    fullname = to_html(message.from_user.full_name)

    await orm.create_user(
        user_id=user_id,
        username=username,
        fullname=fullname,
        register_date=datetime.now(timezone.utc),
    )


async def show_payment_result(
    message: types.Message, state: FSMContext, order_id: str
) -> None:
    payment = await orm.get_payment_by_order_id(order_id)
    if payment is None:
        await state.set_state(MainStates.waiting_amount)
        await message.answer(
            text=(
                "Платёж не найден.\n\n"
                "Отправьте сумму сообщением, чтобы создать новую ссылку."
            ),
            reply_markup=types.ReplyKeyboardRemove(),
        )
        return

    if payment.status not in {"paid", "declined"}:
        await sync_payment_status(order_id)
        payment = await orm.get_payment_by_order_id(order_id)

    await state.set_state(MainStates.main)

    if payment.status == "paid":
        await message.answer(
            text=(
                f"Спасибо за оплату!\n\n"
                f"Платёж на сумму {format_rub_amount(payment.amount)} подтверждён."
            ),
            reply_markup=types.ReplyKeyboardRemove(),
        )
        return

    if payment.status == "declined":
        error_text = ""
        if payment.error_description:
            error_text = f"\nПричина: {payment.error_description}"

        await message.answer(
            text=(
                "Оплата не была подтверждена платёжным сервисом."
                f"{error_text}\n\n"
                "Отправьте новую сумму сообщением, чтобы попробовать ещё раз."
            ),
            reply_markup=types.ReplyKeyboardRemove(),
        )
        return

    await message.answer(
        text=(
            "Платёж ещё обрабатывается платёжным сервисом. "
            "Если вы уже оплатили, подождите несколько секунд и снова откройте бота."
        ),
        reply_markup=types.ReplyKeyboardRemove(),
    )


async def sync_payment_status(order_id: str) -> None:
    try:
        transaction = await wata_client.find_transaction_by_order_id(order_id)
    except WataAPIError:
        logger.exception("WATA returned an API error while syncing order %s", order_id)
        return
    except Exception:
        logger.exception("Unexpected error while syncing order %s", order_id)
        return

    if transaction is None:
        return

    paid_at = None
    if transaction.payment_time:
        paid_at = datetime.fromisoformat(
            transaction.payment_time.strip().replace("Z", "+00:00")
        )

    local_status = "pending"
    if transaction.status == "Paid":
        local_status = "paid"
    elif transaction.status == "Declined":
        local_status = "declined"

    await orm.update_payment_status(
        order_id=order_id,
        status=local_status,
        transaction_status=transaction.status,
        transaction_id=transaction.id,
        error_code=transaction.error_code,
        error_description=transaction.error_description,
        updated_at=datetime.now(timezone.utc),
        paid_at=paid_at,
    )