import hashlib
import hmac
import time
import aiohttp

from aiogram import F, Router, types
from aiogram.fsm.context import FSMContext
from aiogram.fsm.state import State, StatesGroup
from aiogram.types import InlineKeyboardButton, InlineKeyboardMarkup
from aiogram.utils.keyboard import InlineKeyboardBuilder
from sqlalchemy.ext.asyncio import AsyncSession

from config import (
    KASSAI_API_KEY,
    KASSAI_DOMAIN,
    KASSAI_FAILURE_URL,
    KASSAI_IP,
    KASSAI_SHOP_ID,
    KASSAI_SUCCESS_URL,
    PROVIDERS_ENABLED,
)
from handlers.payments.providers import get_providers
from handlers.buttons import BACK, KASSAI_CARDS, KASSAI_SBP, PAY_2
from handlers.texts import (
    ENTER_SUM,
    KASSAI_CARDS_DESCRIPTION,
    KASSAI_PAYMENT_MESSAGE,
    KASSAI_SBP_DESCRIPTION,
    PAYMENT_OPTIONS,
)
from handlers.utils import edit_or_send_message
from logger import logger

router = Router()


class ReplenishBalanceKassaiState(StatesGroup):
    choosing_method = State()
    choosing_amount = State()
    waiting_for_payment_confirmation = State()
    entering_custom_amount = State()


PROVIDERS = get_providers(PROVIDERS_ENABLED)
KASSAI_PAYMENT_METHODS = [
    {
        "enable": bool(PROVIDERS.get("KASSAI_CARDS", {}).get("enabled")),
        "method": 36,
        "name": "cards",
        "button": KASSAI_CARDS,
        "desc": KASSAI_CARDS_DESCRIPTION,
    },
    {
        "enable": bool(PROVIDERS.get("KASSAI_SBP", {}).get("enabled")),
        "method": 44,
        "name": "sbp",
        "button": KASSAI_SBP,
        "desc": KASSAI_SBP_DESCRIPTION,
    },
]



@router.callback_query(F.data == "pay_kassai")
async def process_callback_pay_kassai(
    callback_query: types.CallbackQuery, state: FSMContext, session: AsyncSession, method_name: str = None
):
    try:
        tg_id = callback_query.message.chat.id
        logger.info(f"User {tg_id} initiated KassaAI payment.")
        await state.clear()

        if method_name:
            method = next((m for m in KASSAI_PAYMENT_METHODS if m["name"] == method_name and m["enable"]), None)
            if not method:
                try:
                    await callback_query.message.delete()
                except Exception:
                    pass
                await callback_query.message.answer(
                    text="Ошибка: выбранный способ оплаты недоступен.",
                    reply_markup=InlineKeyboardMarkup(inline_keyboard=[]),
                )
                return

            builder = InlineKeyboardBuilder()
            for i in range(0, len(PAYMENT_OPTIONS), 2):
                if i + 1 < len(PAYMENT_OPTIONS):
                    builder.row(
                        InlineKeyboardButton(
                            text=PAYMENT_OPTIONS[i]["text"],
                            callback_data=f"kassai_amount|{method_name}|{PAYMENT_OPTIONS[i]['callback_data'].split('|')[1]}",
                        ),
                        InlineKeyboardButton(
                            text=PAYMENT_OPTIONS[i + 1]["text"],
                            callback_data=f"kassai_amount|{method_name}|{PAYMENT_OPTIONS[i + 1]['callback_data'].split('|')[1]}",
                        ),
                    )
                else:
                    builder.row(
                        InlineKeyboardButton(
                            text=PAYMENT_OPTIONS[i]["text"],
                            callback_data=f"kassai_amount|{method_name}|{PAYMENT_OPTIONS[i]['callback_data'].split('|')[1]}",
                        )
                    )
            builder.row(InlineKeyboardButton(text="Ввести сумму", callback_data=f"kassai_custom_amount|{method_name}"))
            builder.row(InlineKeyboardButton(text=BACK, callback_data="balance"))

            try:
                await callback_query.message.delete()
            except Exception:
                pass
            new_msg = await callback_query.message.answer(
                text=method["desc"],
                reply_markup=builder.as_markup(),
            )
            await state.update_data(
                kassai_method=method_name,
                message_id=new_msg.message_id,
                chat_id=new_msg.chat.id,
            )
            await state.set_state(ReplenishBalanceKassaiState.choosing_amount)
            return

        builder = InlineKeyboardBuilder()
        for method in KASSAI_PAYMENT_METHODS:
            if method["enable"]:
                builder.row(InlineKeyboardButton(text=method["button"], callback_data=f"kassai_method|{method['name']}"))
        builder.row(InlineKeyboardButton(text=BACK, callback_data="balance"))

        try:
            await callback_query.message.delete()
        except Exception:
            pass
        new_msg = await callback_query.message.answer(
            text="Выберите способ оплаты через KassaAI:",
            reply_markup=builder.as_markup(),
        )
        await state.update_data(message_id=new_msg.message_id, chat_id=new_msg.chat.id)
        await state.set_state(ReplenishBalanceKassaiState.choosing_method)

    except Exception as e:
        logger.error(f"Error in process_callback_pay_kassai for user {callback_query.message.chat.id}: {e}")
        await callback_query.answer("Произошла ошибка при инициализации платежа. Попробуйте позже.", show_alert=True)


@router.callback_query(F.data.startswith("kassai_method|"))
async def process_method_selection(callback_query: types.CallbackQuery, state: FSMContext):
    method_name = callback_query.data.split("|")[1]
    method = next((m for m in KASSAI_PAYMENT_METHODS if m["name"] == method_name), None)

    if not method or not method["enable"]:
        await edit_or_send_message(
            target_message=callback_query.message,
            text="Ошибка: выбранный способ оплаты недоступен.",
            reply_markup=InlineKeyboardMarkup(inline_keyboard=[]),
            force_text=True,
        )
        return

    await state.update_data(kassai_method=method_name)

    builder = InlineKeyboardBuilder()
    for i in range(0, len(PAYMENT_OPTIONS), 2):
        if i + 1 < len(PAYMENT_OPTIONS):
            builder.row(
                InlineKeyboardButton(
                    text=PAYMENT_OPTIONS[i]["text"],
                    callback_data=f"kassai_amount|{method_name}|{PAYMENT_OPTIONS[i]['callback_data'].split('|')[1]}",
                ),
                InlineKeyboardButton(
                    text=PAYMENT_OPTIONS[i + 1]["text"],
                    callback_data=f"kassai_amount|{method_name}|{PAYMENT_OPTIONS[i + 1]['callback_data'].split('|')[1]}",
                ),
            )
        else:
            builder.row(
                InlineKeyboardButton(
                    text=PAYMENT_OPTIONS[i]["text"],
                    callback_data=f"kassai_amount|{method_name}|{PAYMENT_OPTIONS[i]['callback_data'].split('|')[1]}",
                )
            )
    builder.row(InlineKeyboardButton(text="Ввести сумму", callback_data=f"kassai_custom_amount|{method_name}"))
    builder.row(InlineKeyboardButton(text=BACK, callback_data="pay_kassai"))

    await edit_or_send_message(
        target_message=callback_query.message,
        text=method["desc"],
        reply_markup=builder.as_markup(),
        force_text=True,
    )
    await state.update_data(message_id=callback_query.message.message_id, chat_id=callback_query.message.chat.id)
    await state.set_state(ReplenishBalanceKassaiState.choosing_amount)


@router.callback_query(F.data.startswith("kassai_custom_amount|"))
async def process_custom_amount_button(callback_query: types.CallbackQuery, state: FSMContext):
    method_name = callback_query.data.split("|")[1]
    await state.update_data(kassai_method=method_name)

    builder = InlineKeyboardBuilder()
    builder.row(InlineKeyboardButton(text=BACK, callback_data=f"pay_kassai_{method_name}"))

    await edit_or_send_message(
        target_message=callback_query.message,
        text=ENTER_SUM,
        reply_markup=builder.as_markup(),
        force_text=True,
    )
    await state.set_state(ReplenishBalanceKassaiState.entering_custom_amount)


@router.message(ReplenishBalanceKassaiState.entering_custom_amount)
async def handle_custom_amount_input(message: types.Message, state: FSMContext):
    data = await state.get_data()
    method_name = data.get("kassai_method")
    method = next((m for m in KASSAI_PAYMENT_METHODS if m["name"] == method_name), None)

    if not method or not method["enable"]:
        await edit_or_send_message(
            target_message=message,
            text="Ошибка: выбранный способ оплаты недоступен.",
            reply_markup=InlineKeyboardMarkup(inline_keyboard=[]),
            force_text=True,
        )
        return

    try:
        amount = int(message.text.strip())
        if amount <= 0:
            raise ValueError
        if method_name == "sbp" and amount < 10:
            await edit_or_send_message(
                target_message=message,
                text="Минимальная сумма для оплаты через СБП — 10 рублей.",
                reply_markup=InlineKeyboardMarkup(inline_keyboard=[]),
                force_text=True,
            )
            return
    except Exception:
        await edit_or_send_message(
            target_message=message,
            text="Некорректная сумма. Введите целое число больше 0.",
            reply_markup=InlineKeyboardMarkup(inline_keyboard=[]),
            force_text=True,
        )
        return

    await state.update_data(amount=amount)
    payment_url = await generate_kassai_payment_link(amount, message.chat.id, method)

    confirm_keyboard = InlineKeyboardMarkup(
        inline_keyboard=[
            [InlineKeyboardButton(text=PAY_2, url=payment_url)],
            [InlineKeyboardButton(text=BACK, callback_data="balance")],
        ]
    )

    await edit_or_send_message(
        target_message=message,
        text=KASSAI_PAYMENT_MESSAGE.format(amount=amount),
        reply_markup=confirm_keyboard,
        force_text=True,
    )

    await state.set_state(ReplenishBalanceKassaiState.waiting_for_payment_confirmation)


@router.callback_query(F.data.startswith("kassai_amount|"))
async def process_amount_selection(callback_query: types.CallbackQuery, state: FSMContext):
    parts = callback_query.data.split("|")
    method_name = parts[1]
    amount_str = parts[2]

    method = next((m for m in KASSAI_PAYMENT_METHODS if m["name"] == method_name), None)

    if not method or not method["enable"]:
        await edit_or_send_message(
            target_message=callback_query.message,
            text="Ошибка: выбранный способ оплаты недоступен.",
            reply_markup=InlineKeyboardMarkup(inline_keyboard=[]),
            force_text=True,
        )
        return

    try:
        amount = int(amount_str)
        if amount <= 0:
            raise ValueError
    except Exception:
        await edit_or_send_message(
            target_message=callback_query.message,
            text="Некорректная сумма.",
            reply_markup=InlineKeyboardMarkup(inline_keyboard=[]),
            force_text=True,
        )
        return

    await state.update_data(amount=amount)
    payment_url = await generate_kassai_payment_link(amount, callback_query.message.chat.id, method)

    confirm_keyboard = InlineKeyboardMarkup(
        inline_keyboard=[
            [InlineKeyboardButton(text=PAY_2, url=payment_url)],
            [InlineKeyboardButton(text=BACK, callback_data="balance")],
        ]
    )

    await edit_or_send_message(
        target_message=callback_query.message,
        text=KASSAI_PAYMENT_MESSAGE.format(amount=amount),
        reply_markup=confirm_keyboard,
        force_text=True,
    )

    await state.set_state(ReplenishBalanceKassaiState.waiting_for_payment_confirmation)


async def generate_kassai_payment_link(amount: int, tg_id: int, method: dict) -> str:
    """
    Создание заказа в KassaAI и получение ссылки на оплату
    """
    nonce = int(time.time())
    unique_payment_id = f"{nonce}_{tg_id}"
    url = "https://api.fk.life/v1/orders/create"

    headers = {"Content-Type": "application/json"}

    client_email = f"{tg_id}@{KASSAI_DOMAIN}"
    client_ip = KASSAI_IP

    data_for_signature = {
        "shopId": KASSAI_SHOP_ID,
        "nonce": nonce,
        "i": method["method"],
        "email": client_email,
        "ip": client_ip,
        "amount": int(amount),
        "currency": "RUB",
        "success_url": KASSAI_SUCCESS_URL,
        "failure_url": KASSAI_FAILURE_URL,
        "paymentId": unique_payment_id,
    }

    sign_string = "|".join(str(data_for_signature[k]) for k in sorted(data_for_signature.keys()))
    signature = hmac.new(KASSAI_API_KEY.encode("utf-8"), sign_string.encode("utf-8"), hashlib.sha256).hexdigest()

    data = {**data_for_signature, "signature": signature}

    try:
        async with aiohttp.ClientSession() as session:
            async with session.post(url, headers=headers, json=data, timeout=60) as resp:
                if resp.status == 200:
                    try:
                        resp_json = await resp.json()
                        if resp_json.get("type") == "success":
                            payment_url = resp_json.get("location")
                            if payment_url:
                                logger.info(f"KassaAI payment URL created for user {tg_id}")
                                return payment_url
                            logger.error(f"KassaAI: No location in response: {resp_json}")
                            return "https://fk.life/"
                        logger.error(f"KassaAI: Unsuccessful response: {resp_json}")
                        return "https://fk.life/"
                    except Exception as e:
                        logger.error(f"KassaAI: Error parsing JSON response: {e}")
                        text = await resp.text()
                        logger.error(f"KassaAI: Response content: {text}")
                        return "https://fk.life/"
                else:
                    try:
                        error_json = await resp.json()
                        logger.error(f"KassaAI API error: status={resp.status}, response={error_json}")
                    except Exception:
                        text = await resp.text()
                        logger.error(f"KassaAI API error: status={resp.status}, non-JSON response: {text}")
                    return "https://fk.life/"
    except Exception as e:
        logger.error(f"Error creating KassaAI order: {e}")
        return "https://fk.life/"
