"""Small JSON-RPC client for Alchemy EVM endpoints."""

from __future__ import annotations

from dataclasses import dataclass
from typing import Any

import requests


DEFAULT_ALCHEMY_CHAIN_ENDPOINTS = {
    "ethereum": "https://eth-mainnet.g.alchemy.com/v2/{api_key}",
    "bsc": "https://bnb-mainnet.g.alchemy.com/v2/{api_key}",
}


@dataclass(frozen=True)
class AlchemyConfig:
    api_key: str
    timeout: int = 15
    endpoints: dict[str, str] | None = None


class AlchemyClient:
    def __init__(self, config: AlchemyConfig):
        self.config = config
        self.endpoints = {**DEFAULT_ALCHEMY_CHAIN_ENDPOINTS, **(config.endpoints or {})}

    def supports_chain(self, chain: str) -> bool:
        return bool(self._endpoint(chain))

    def call(self, chain: str, method: str, params: list[Any] | None = None) -> Any:
        endpoint = self._endpoint(chain)
        if not endpoint:
            raise ValueError(f"alchemy_chain_not_configured:{chain}")
        payload = {
            "jsonrpc": "2.0",
            "id": 1,
            "method": method,
            "params": params or [],
        }
        resp = requests.post(
            endpoint,
            json=payload,
            timeout=self.config.timeout,
            headers={"Content-Type": "application/json", "User-Agent": "AlphaX-Agent-Crypto/1.0"},
        )
        if resp.status_code >= 400:
            raise RuntimeError(f"alchemy_http_{resp.status_code}:{resp.text[:200]}")
        data = resp.json()
        if data.get("error"):
            raise RuntimeError(f"alchemy_rpc_error:{data['error']}")
        return data.get("result")

    def block_number(self, chain: str) -> int:
        return _hex_to_int(self.call(chain, "eth_blockNumber", []))

    def get_logs(self, chain: str, log_filter: dict[str, Any]) -> list[dict[str, Any]]:
        result = self.call(chain, "eth_getLogs", [log_filter])
        return result if isinstance(result, list) else []

    def eth_call(self, chain: str, to_address: str, data: str, block: str = "latest") -> str:
        result = self.call(chain, "eth_call", [{"to": to_address, "data": data}, block])
        return str(result or "")

    def _endpoint(self, chain: str) -> str:
        chain_key = str(chain or "").lower().strip()
        template = self.endpoints.get(chain_key, "")
        if not template or not self.config.api_key:
            return ""
        return template.format(api_key=self.config.api_key)


def _hex_to_int(value: Any) -> int:
    if value is None:
        return 0
    if isinstance(value, int):
        return value
    text = str(value).strip()
    if not text:
        return 0
    try:
        return int(text, 16) if text.startswith("0x") else int(text)
    except Exception:
        return 0