"""组合策略 API 路由(MVP)。

POST /portfolio/backtest: SSH 触发 VPS 跑 BulletTrade + all_weather,
捕获 stdout JSON 返回前端。同步模式(回测耗时,前端 loading,timeout 600s)。

风格参考 routes_paper.py / routes_live.py。
"""
from __future__ import annotations

import logging
import os
import subprocess
import sys
from typing import Any, Optional

from fastapi import APIRouter, Depends, Header, HTTPException
from pydantic import BaseModel, Field

from .auth import verify_token as verify_token_impl

logger = logging.getLogger(__name__)
router = APIRouter()

# VPS SSH 连接配置(~/.ssh/config 已配 49.232.102.198 免密 key)
_VPS_HOST = "49.232.102.198"
_VPS_WORKDIR = r"C:\\sanguo_vnpy_v2"
_VPS_PYTHON = "python"
_VPS_TIMEOUT = 600  # 回测耗时,给 10 分钟


async def verify_token(authorization: str | None = Header(None)):
    if authorization is None or not authorization.startswith("Bearer "):
        raise HTTPException(401, "Missing/invalid authorization")
    return verify_token_impl(authorization.split(" ", 1)[1])


class PortfolioBacktestRequest(BaseModel):
    pool: str = Field(default="hs300_subset", description="标的池(占位,MVP 用默认)")
    start_date: str = Field(default="2024-01-01", description="YYYY-MM-DD")
    end_date: str = Field(default="2024-02-29", description="YYYY-MM-DD")
    initial_cash: float = Field(default=1_000_000.0, description="初始资金(元)")
    benchmark: str = Field(default="000300.XSHG", description="基准代码")


@router.post("/portfolio/backtest", dependencies=[Depends(verify_token)])
def run_portfolio_backtest(req: PortfolioBacktestRequest):
    """SSH 触发 VPS 跑 BulletTrade + all_weather 回测,同步返回 JSON 结果。

    Windows SSH 坑:
    - GBK 编码:python -X utf8 避免中文 print 编码崩
    - 引号嵌套:用 list 形式 argv,避免 shell 引号 escape 噩梦
    - 没有 tail/head/grep:用 python 后处理(本函数在 Mac 端直接解析 stdout)
    - 中文路径:VPS_WORKDIR / userdata_mini 走 env(DEFAULT_DATA_PROVIDER=miniqmt)
    """
    # 本地模式(VPS 后端直接跑 runner,避免 SSH 自连外网 IP 绕路);
    # SSH 模式(Mac 后端 → VPS)。env SANGUO_PORTFOLIO_LOCAL=1 切本地。
    # 自动检测:VPS 上 _VPS_WORKDIR(C:\sanguo_vnpy_v2) 存在 → 本地直接跑 runner;
    # Mac 上无该目录 → SSH 到 VPS。无需 env 配置,同源代码两端自适应。
    if os.path.isdir(_VPS_WORKDIR):
        argv = [
            sys.executable, "-X", "utf8", "-m", "sanguo_portfolio.runner_backtest",
            "--json", "--start", req.start_date, "--end", req.end_date,
            "--cash", str(req.initial_cash), "--benchmark", req.benchmark, "--max-pool", "30",
        ]
        logger.info("[portfolio] 本地跑 runner: %s", " ".join(argv[3:]))
        try:
            proc = subprocess.run(
                argv, cwd=_VPS_WORKDIR, capture_output=True, text=True,
                timeout=_VPS_TIMEOUT, check=False,
            )
        except subprocess.TimeoutExpired:
            raise HTTPException(504, f"回测超时(>{_VPS_TIMEOUT}s)")
        except Exception as exc:
            logger.exception("[portfolio] 本地 runner 调用失败")
            raise HTTPException(500, f"本地 runner 调用失败: {exc}")
    else:
        # Mac 端 SSH 到 VPS(远端命令手动拼,不用 shlex.quote:产 POSIX 单引号 cmd 不认)
        remote_cmd = (
            f"cd {_VPS_WORKDIR} && "
            f"{_VPS_PYTHON} -X utf8 -m sanguo_portfolio.runner_backtest --json "
            f"--start {req.start_date} --end {req.end_date} "
            f"--cash {req.initial_cash} --benchmark {req.benchmark} "
            f"--max-pool 30"
        )
        ssh_argv = [
            "ssh", "-o", "ConnectTimeout=15", "-o", "StrictHostKeyChecking=no",
            _VPS_HOST, remote_cmd,
        ]
        logger.info("[portfolio] SSH 触发: %s", remote_cmd)
        try:
            proc = subprocess.run(
                ssh_argv, capture_output=True, text=True,
                timeout=_VPS_TIMEOUT, check=False,
            )
        except subprocess.TimeoutExpired:
            raise HTTPException(504, f"VPS 回测超时(>{_VPS_TIMEOUT}s)")
        except FileNotFoundError:
            raise HTTPException(500, "本机未找到 ssh 命令")
        except Exception as exc:
            logger.exception("[portfolio] SSH 调用失败")
            raise HTTPException(500, f"SSH 调用失败: {exc}")

    if proc.returncode != 0:
        stderr_tail = (proc.stderr or "")[-2000:]
        logger.error("[portfolio] VPS 回测失败 rc=%s stderr=%s", proc.returncode, stderr_tail)
        raise HTTPException(
            500,
            f"VPS 回测失败(rc={proc.returncode}): {stderr_tail}",
        )

    # 从 stdout 提取最后一行 JSON(runner --json 只 print 一行)
    stdout = proc.stdout or ""
    import json as _json
    result: Optional[dict[str, Any]] = None
    parse_err: Optional[str] = None
    for line in reversed(stdout.strip().splitlines()):
        line = line.strip()
        if not line.startswith("{"):
            continue
        try:
            result = _json.loads(line)
            break
        except _json.JSONDecodeError as exc:
            parse_err = str(exc)
            continue

    if result is None:
        logger.error(
            "[portfolio] stdout 无 JSON 行。parse_err=%s stdout_tail=%s",
            parse_err, stdout[-2000:],
        )
        raise HTTPException(
            500,
            f"VPS stdout 解析失败: {parse_err or 'no JSON line'}; stdout_tail={stdout[-500:]!r}",
        )

    return result