import asyncio
import hashlib
import json
from http import HTTPStatus
from os import getenv
from typing import AsyncGenerator, Dict, Optional

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

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


class LNPayWallet(Wallet):
    """https://docs.lnpay.co/"""

    def __init__(self):
        endpoint = getenv("LNPAY_API_ENDPOINT", "https://lnpay.co/v1")
        self.endpoint = endpoint[:-1] if endpoint.endswith("/") else endpoint
        self.wallet_key = getenv("LNPAY_WALLET_KEY") or getenv("LNPAY_ADMIN_KEY")
        self.auth = {"X-Api-Key": getenv("LNPAY_API_KEY")}

    async def status(self) -> StatusResponse:
        url = f"{self.endpoint}/wallet/{self.wallet_key}"
        try:
            async with httpx.AsyncClient() as client:
                r = await client.get(url, headers=self.auth, timeout=60)
        except (httpx.ConnectError, httpx.RequestError):
            return StatusResponse(f"Unable to connect to '{url}'", 0)

        if r.is_error:
            return StatusResponse(r.text[:250], 0)

        data = r.json()
        if data["statusType"]["name"] != "active":
            return StatusResponse(
                f"Wallet {data['user_label']} (data['id']) not active, but {data['statusType']['name']}",
                0,
            )

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

    async def create_invoice(
        self,
        amount: int,
        memo: Optional[str] = None,
        description_hash: Optional[bytes] = None,
        unhashed_description: Optional[bytes] = None,
        **kwargs,
    ) -> InvoiceResponse:
        data: Dict = {"num_satoshis": f"{amount}"}
        if description_hash:
            data["description_hash"] = description_hash.hex()
        elif unhashed_description:
            data["description_hash"] = hashlib.sha256(unhashed_description).hexdigest()
        else:
            data["memo"] = memo or ""

        async with httpx.AsyncClient() as client:
            r = await client.post(
                f"{self.endpoint}/wallet/{self.wallet_key}/invoice",
                headers=self.auth,
                json=data,
                timeout=60,
            )
        ok, checking_id, payment_request, error_message = (
            r.status_code == 201,
            None,
            None,
            r.text,
        )

        if ok:
            data = r.json()
            checking_id, payment_request = data["id"], data["payment_request"]

        return InvoiceResponse(ok, checking_id, payment_request, error_message)

    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}/wallet/{self.wallet_key}/withdraw",
                headers=self.auth,
                json={"payment_request": bolt11},
                timeout=None,
            )

        try:
            data = r.json()
        except:
            return PaymentResponse(
                False, None, 0, None, f"Got invalid JSON: {r.text[:200]}"
            )

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

        checking_id = data["lnTx"]["id"]
        fee_msat = 0
        preimage = data["lnTx"]["payment_preimage"]
        return PaymentResponse(True, checking_id, fee_msat, preimage, None)

    async def get_invoice_status(self, checking_id: str) -> PaymentStatus:
        return await self.get_payment_status(checking_id)

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

        if r.is_error:
            return PaymentStatus(None)

        data = r.json()
        preimage = data["payment_preimage"]
        fee_msat = data["fee_msat"]
        statuses = {0: None, 1: True, -1: False}
        return PaymentStatus(statuses[data["settled"]], fee_msat, preimage)

    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):
        text: str = await request.get_data()
        try:
            data = json.loads(text)
        except json.decoder.JSONDecodeError:
            logger.error(f"got something wrong on lnpay webhook endpoint: {text[:200]}")
            data = None
        if (
            type(data) is not dict
            or "event" not in data
            or data["event"].get("name") != "wallet_receive"
        ):
            raise HTTPException(status_code=HTTPStatus.NO_CONTENT)

        lntx_id = data["data"]["wtx"]["lnTx"]["id"]
        async with httpx.AsyncClient() as client:
            r = await client.get(
                f"{self.endpoint}/lntx/{lntx_id}?fields=settled", headers=self.auth
            )
            data = r.json()
            if data["settled"]:
                await self.queue.put(lntx_id)

        raise HTTPException(status_code=HTTPStatus.NO_CONTENT)
