"""余额获取：模板渲染 → HTTP 请求（带重试）→ JSON 路径提取。"""

from __future__ import annotations

import logging
import time
from dataclasses import dataclass

import requests

from app.expr import extract_path, to_number
from app.providers.base import BalanceProvider

logger = logging.getLogger("monitor.fetcher")

PLACEHOLDER = "{{apiKey}}"


@dataclass
class FetchResult:
    """一次拉取的结果。"""

    ok: bool
    balance: float | None = None
    auth_error: bool = False
    status_code: int | None = None
    error: str = ""


def render_template(text: str, api_key: str) -> str:
    """把模板中的 {{apiKey}} 替换为账号密钥。"""
    return text.replace(PLACEHOLDER, api_key)


def extract_balance(data: object, path: str) -> float:
    """按点路径/数组索引提取余额（兼容旧写法，返回 float）。

    新写法请用 evaluate_balance（支持运算符与函数）。
    """
    return to_number(extract_path(data, path), path)


def fetch_balance(
    provider: BalanceProvider,
    api_key: str,
    retry_count: int,
    timeout: int,
) -> FetchResult:
    """执行一次余额拉取。

    策略：
    - 401/403 → 先按重试次数确认（可能瞬时），仍失败 → auth_error（调用方禁用账号并通知）
    - 其他 4xx → 直接失败（不重试）
    - 网络异常 / 5xx → 重试 retry_count 次，间隔 2s
    - JSON 解析/余额提取失败 → 直接失败
    """
    url, headers, body = provider.build_request(api_key)
    method = provider.method
    if method == "POST" and body and not any(k.lower() == "content-type" for k in headers):
        headers["Content-Type"] = "application/json"
    attempts = retry_count + 1
    for attempt in range(attempts):
        t0 = time.time()
        try:
            if method == "GET":
                resp = requests.get(url, headers=headers, timeout=timeout)
            else:
                resp = requests.post(url, headers=headers, data=body, timeout=timeout)
            logger.debug("请求完成 %s -> %s（%.0fms）", url, resp.status_code, (time.time() - t0) * 1000)
        except requests.RequestException as exc:
            logger.warning("请求异常(%s/%s) %s: %s（%.0fms）", attempt + 1, attempts, url, exc, (time.time() - t0) * 1000)
            if attempt < attempts - 1:
                time.sleep(2)
            continue
        if resp.status_code in (401, 403):
            # 认证失败可能是瞬时的（key 刚生效/风控），先按重试次数再确认，仍失败才判定
            if attempt < attempts - 1:
                logger.warning("认证失败(%s/%s) %s status=%s，重试确认", attempt + 1, attempts, url, resp.status_code)
                time.sleep(1)
                continue
            return FetchResult(ok=False, auth_error=True, status_code=resp.status_code,
                               error=f"HTTP {resp.status_code}（认证失败）")
        if resp.status_code >= 500:
            logger.warning("服务端错误(%s/%s) %s status=%s", attempt + 1, attempts, url, resp.status_code)
            if attempt < attempts - 1:
                time.sleep(2)
            continue
        if resp.status_code >= 400:
            return FetchResult(ok=False, status_code=resp.status_code,
                               error=f"HTTP {resp.status_code}: {resp.text[:120]}")
        try:
            data = resp.json()
        except ValueError:
            return FetchResult(ok=False, status_code=resp.status_code,
                               error="响应不是合法 JSON")
        try:
            balance = provider.extract_balance(data)
        except Exception as exc:
            return FetchResult(ok=False, status_code=resp.status_code, error=str(exc))
        return FetchResult(ok=True, balance=balance, status_code=resp.status_code)
    return FetchResult(ok=False, error=f"网络错误，重试 {retry_count} 次后仍失败")