"""命令行：ZED 分段录制。

- ``start``（默认）：本进程内 ``start_zed_recording``，前台阻塞直到 Ctrl+C 再 ``stop``（不经过 HTTP）。
- ``start --remote``：``POST`` 已运行的 fish_api，不阻塞。
- ``stop`` / ``status``：仅 HTTP，用于停/查 **由 uvicorn 进程托管** 的录制。

HTTP 基址：环境变量 ``FISH_API_BASE_URL`` 或 ``PUBLIC_BASE_URL``，否则 ``http://127.0.0.1:8000``。
ZED 路由不校验 ingest API Key，请求无需 ``X-API-Key``。

每次启动由服务端分配 ``fish_id``（库表与 ``output_dir``、目标父目录下 ``fish``+数字 及 ``.svo2`` 路径综合）并写入 ``zed_recording_sessions``。
"""

from __future__ import annotations

import argparse
import json
import os
import sys
import time
import urllib.error
import urllib.request
from typing import Any, Dict, Optional


def _base_url() -> str:
    """优先环境变量；否则从 ``fish_api/.env`` 经 ``get_settings()`` 读 ``FISH_API_BASE_URL`` / ``PUBLIC_BASE_URL``。"""
    u = os.environ.get("FISH_API_BASE_URL") or os.environ.get("PUBLIC_BASE_URL")
    if u:
        return str(u).strip().rstrip("/")
    from app.settings import get_settings

    s = get_settings()
    u2 = (s.fish_api_base_url or "").strip() or (s.public_base_url or "").strip()
    if u2:
        return u2.rstrip("/")
    return "http://127.0.0.1:8000"


def _http_request_json(method: str, path: str, body: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
    url = _base_url() + path
    if method == "GET":
        req = urllib.request.Request(url, method="GET")
    elif method == "POST":
        payload = json.dumps(body if body is not None else {}).encode("utf-8")
        req = urllib.request.Request(
            url,
            data=payload,
            headers={"Content-Type": "application/json; charset=utf-8"},
            method="POST",
        )
    else:
        raise ValueError(method)

    try:
        with urllib.request.urlopen(req, timeout=120) as resp:
            raw = resp.read().decode("utf-8")
            if not raw.strip():
                return {}
            return json.loads(raw)
    except urllib.error.HTTPError as e:
        err_body = e.read().decode("utf-8", errors="replace")
        print(f"HTTP {e.code}: {err_body}", file=sys.stderr)
        raise SystemExit(1) from None
    except urllib.error.URLError as e:
        print(f"请求失败: {e}", file=sys.stderr)
        raise SystemExit(1) from None


def _cmd_start_remote(args: argparse.Namespace) -> None:
    body: Dict[str, Any] = {}
    if args.segment_sec is not None:
        body["segment_sec"] = args.segment_sec
    r = _http_request_json("POST", "/api/v1/zed/recording/start", body)
    print(json.dumps(r, ensure_ascii=False, indent=2))


def _cmd_start_local(args: argparse.Namespace) -> None:
    from app.services.zed_recording_control import (
        start_zed_recording,
        stop_zed_recording,
    )
    from app.settings import get_settings

    s = get_settings()
    ok, msg, fish_id, _ = start_zed_recording(
        s,
        segment_sec=args.segment_sec,
    )
    if not ok:
        print(f"启动失败: {msg}", file=sys.stderr)
        raise SystemExit(1)

    print(
        f"fish_id={fish_id}，录制中，按 Ctrl+C 停止…",
        flush=True,
    )
    try:
        while True:
            time.sleep(1.0)
    except KeyboardInterrupt:
        print("\n正在停止…", flush=True)
    stop_ok, stop_msg, stop_fish = stop_zed_recording(s)
    if stop_ok:
        print(f"已退出。fish_id={stop_fish}", flush=True)
    else:
        print(f"停止结果: {stop_msg}", file=sys.stderr)


def _cmd_stop(_args: argparse.Namespace) -> None:
    r = _http_request_json("POST", "/api/v1/zed/recording/stop", {})
    print(json.dumps(r, ensure_ascii=False, indent=2))


def _cmd_status(_args: argparse.Namespace) -> None:
    r = _http_request_json("GET", "/api/v1/zed/recording/status", None)
    print(json.dumps(r, ensure_ascii=False, indent=2))


def main() -> None:
    parser = argparse.ArgumentParser(
        description="ZED 分段录制：本地阻塞 start，或 HTTP 调用 fish_api",
    )
    sub = parser.add_subparsers(dest="cmd", required=True)

    p_start = sub.add_parser("start", help="本地启动（阻塞至 Ctrl+C）或 --remote 仅请求 API")
    p_start.add_argument(
        "--remote",
        action="store_true",
        help="通过 HTTP 调用 fish_api，不阻塞本进程",
    )
    p_start.add_argument("--segment-sec", type=float, default=None, metavar="SEC")

    sub.add_parser("stop", help="HTTP 停止 fish_api 进程中的录制")
    sub.add_parser("status", help="HTTP 查询 fish_api 中的录制状态")

    args = parser.parse_args()

    if args.cmd == "start":
        if args.remote:
            _cmd_start_remote(args)
        else:
            _cmd_start_local(args)
    elif args.cmd == "stop":
        _cmd_stop(args)
    elif args.cmd == "status":
        _cmd_status(args)


if __name__ == "__main__":
    main()