import asyncio
import hmac
from http import HTTPStatus
from os import getenv
from typing import AsyncGenerator, Optional

import httpx
from fastapi.exceptions import HTTPException
from loguru import logger

from lnbits.helpers import url_for

from .base import (
    InvoiceResponse,
    PaymentResponse,
    PaymentStatus,
    StatusResponse,
    Unsupported,
    Wallet,
)


class OpenNodeWallet(Wallet):
    """https://developers.opennode.com/"""

    def __init__(self):
        endpoint = getenv("OPENNODE_API_ENDPOINT")
        self.endpoint = endpoint[:-1] if endpoint.endswith("/") else endpoint

        key = (
            getenv("OPENNODE_KEY")
            or getenv("OPENNODE_ADMIN_KEY")
            or getenv("OPENNODE_INVOICE_KEY")
        )
        self.auth = {"Authorization": key}

    async def status(self) -> StatusResponse:
        try:
            async with httpx.AsyncClient() as client:
                r = await client.get(
                    f"{self.endpoint}/v1/account/balance", headers=self.auth, timeout=40
                )
        except (httpx.ConnectError, httpx.RequestError):
            return StatusResponse(f"Unable to connect to '{self.endpoint}'", 0)

        data = r.json()["data"]
        if r.is_error:
            return StatusResponse(data["message"], 0)

        return StatusResponse(None, data["balance"]["BTC"] * 1000)

    async def create_invoice(
        self,
        amount: int,
        memo: Optional[str] = None,
        description_hash: Optional[bytes] = None,
        unhashed_description: Optional[bytes] = None,
        **kwargs,
    ) -> InvoiceResponse:
        if description_hash or unhashed_description:
            raise Unsupported("description_hash")

        async with httpx.AsyncClient() as client:
            r = await client.post(
                f"{self.endpoint}/v1/charges",
                headers=self.auth,
                json={
                    "amount": amount,
                    "description": memo or "",
                    # "callback_url": url_for("/webhook_listener", _external=True),
                },
                timeout=40,
            )

        if r.is_error:
            error_message = r.json()["message"]
            return InvoiceResponse(False, None, None, error_message)

        data = r.json()["data"]
        checking_id = data["id"]
        payment_request = data["lightning_invoice"]["payreq"]
        return InvoiceResponse(True, checking_id, payment_request, None)

    async def pay_invoice(self, bolt11: str, fee_limit_msat: int) -> PaymentResponse:
        async with httpx.AsyncClient() as client:
            r = await client.post(
                f"{self.endpoint}/v2/withdrawals",
                headers=self.auth,
                json={"type": "ln", "address": bolt11},
                timeout=None,
            )

        if r.is_error:
            error_message = r.json()["message"]
            return PaymentResponse(False, None, None, None, error_message)

        data = r.json()["data"]
        checking_id = data["id"]
        fee_msat = -data["fee"] * 1000

        if data["status"] != "paid":
            return PaymentResponse(None, checking_id, fee_msat, None, "payment failed")

        return PaymentResponse(True, checking_id, fee_msat, None, None)

    async def get_invoice_status(self, checking_id: str) -> PaymentStatus:
        async with httpx.AsyncClient() as client:
            r = await client.get(
                f"{self.endpoint}/v1/charge/{checking_id}", headers=self.auth
            )
        if r.is_error:
            return PaymentStatus(None)
        data = r.json()["data"]
        statuses = {"processing": None, "paid": True, "unpaid": None}
        return PaymentStatus(statuses[data.get("status")])

    async def get_payment_status(self, checking_id: str) -> PaymentStatus:
        async with httpx.AsyncClient() as client:
            r = await client.get(
                f"{self.endpoint}/v1/withdrawal/{checking_id}", headers=self.auth
            )

        if r.is_error:
            return PaymentStatus(None)

        data = r.json()["data"]
        statuses = {
            "initial": None,
            "pending": None,
            "confirmed": True,
            "error": None,
            "failed": False,
        }
        fee_msat = -data.get("fee") * 1000
        return PaymentStatus(statuses[data.get("status")], fee_msat)

    async def paid_invoices_stream(self) -> AsyncGenerator[str, None]:
        self.queue: asyncio.Queue = asyncio.Queue(0)
        while True:
            value = await self.queue.get()
            yield value

    async def webhook_listener(self):
        data = await request.form
        if "status" not in data or data["status"] != "paid":
            raise HTTPException(status_code=HTTPStatus.NO_CONTENT)

        charge_id = data["id"]
        x = hmac.new(self.auth["Authorization"].encode("ascii"), digestmod="sha256")
        x.update(charge_id.encode("ascii"))
        if x.hexdigest() != data["hashed_order"]:
            logger.error("invalid webhook, not from opennode")
            raise HTTPException(status_code=HTTPStatus.NO_CONTENT)

        await self.queue.put(charge_id)
        raise HTTPException(status_code=HTTPStatus.NO_CONTENT)
