"""SHKeeper client — thin wrapper over the self-hosted SHKeeper REST API.

SHKeeper (https://github.com/vsys-host/shkeeper.io) is our crypto payment
gateway. It exposes one REST endpoint per coin at
    {SHKEEPER_URL}/api/v1/{coin}/...
with bearer auth via X-Shkeeper-Api-Key header.

We use it for two things post-webhook:
    1. payout()  — withdraw coins from the SHKeeper hot wallet to an
                   external address (either a Coinbase Prime deposit
                   address for offramp, or the cold wallet for sweeps).
    2. balance() — read the current hot-wallet balance for sweep sizing.

SHKeeper exposes a /payout endpoint; exact shape varies by coin but
follows the pattern documented in the project's API README. Confirm
shape against the running instance during first real test — we stub
with sensible defaults and will iterate.
"""

from __future__ import annotations

import logging
import os
from dataclasses import dataclass
from decimal import Decimal
from typing import Optional

import httpx

logger = logging.getLogger(__name__)

SHKEEPER_URL = os.environ.get("SHKEEPER_URL", "http://127.0.0.1:5000")
SHKEEPER_API_KEY = os.environ.get("SHKEEPER_API_KEY", "")


@dataclass
class PayoutResult:
    withdraw_id: str
    tx_hash: Optional[str]
    fee_coin: Decimal = Decimal("0")
    raw: dict = None  # type: ignore[assignment]


@dataclass
class BalanceResult:
    balance_coin: Decimal
    balance_usd: Decimal   # SHKeeper returns fiat equivalent on balance
    updated_at: Optional[str] = None


class SHKeeperError(Exception):
    """Any SHKeeper API failure."""


class SHKeeperClient:
    def __init__(
        self,
        base_url: Optional[str] = None,
        api_key: Optional[str] = None,
    ):
        self.base = base_url or SHKEEPER_URL
        self.api_key = api_key or SHKEEPER_API_KEY
        if not self.api_key:
            logger.warning(
                "SHKeeperClient: SHKEEPER_API_KEY empty — calls will fail",
            )

    async def payout(
        self,
        *, coin: str, destination: str, amount: Decimal,
    ) -> PayoutResult:
        """POST /api/v1/{coin}/payout — withdraw to an external address.

        Request body (per SHKeeper docs):
            {"destination": "<addr>", "amount": "<decimal>"}
        Response includes a withdraw_id + eventually a tx_hash.
        """
        path = f"/api/v1/{coin.lower()}/payout"
        body = {
            "destination": destination,
            "amount": str(amount),
        }
        resp = await self._request("POST", path, json_body=body)
        return PayoutResult(
            withdraw_id=str(resp.get("withdraw_id") or resp.get("id") or ""),
            tx_hash=resp.get("tx_hash") or resp.get("txid"),
            fee_coin=Decimal(str(resp.get("fee") or "0")),
            raw=resp,
        )

    async def balance(self, coin: str) -> BalanceResult:
        """GET /api/v1/{coin}/balance — current hot-wallet balance."""
        path = f"/api/v1/{coin.lower()}/balance"
        resp = await self._request("GET", path)
        return BalanceResult(
            balance_coin=Decimal(str(resp.get("balance") or "0")),
            balance_usd=Decimal(str(resp.get("balance_usd") or resp.get("fiat_balance") or "0")),
            updated_at=resp.get("updated_at"),
        )

    async def withdrawal_status(self, coin: str, withdraw_id: str) -> dict:
        """GET /api/v1/{coin}/payout/{id} — poll for confirmation."""
        path = f"/api/v1/{coin.lower()}/payout/{withdraw_id}"
        return await self._request("GET", path)

    async def _request(
        self, method: str, path: str,
        *, json_body: Optional[dict] = None,
    ) -> dict:
        url = f"{self.base}{path}"
        headers = {
            "X-Shkeeper-Api-Key": self.api_key,
            "Content-Type": "application/json",
        }
        try:
            async with httpx.AsyncClient(timeout=30.0) as client:
                resp = await client.request(method, url, headers=headers, json=json_body)
        except httpx.HTTPError as exc:
            raise SHKeeperError(f"SHKeeper request failed: {exc}") from exc
        if resp.status_code >= 400:
            raise SHKeeperError(
                f"SHKeeper {method} {path} → {resp.status_code}: {resp.text[:300]}",
            )
        try:
            return resp.json()
        except ValueError:
            return {}