#!/usr/bin/env python3
"""vol_live 모니터 — JSON/HTML 갱신 + HTTP 서버 (통합).

기본 (인자 없음): 전체 갱신(--full) 후 서버 기동
  python scripts/3_run_vol_monitor.py

갱신만:
  python scripts/3_run_vol_monitor.py --refresh-only

서버만:
  python scripts/3_run_vol_monitor.py --serve-only
"""

from __future__ import annotations

import argparse
import json
import logging
import os
import sys
import threading
import time
from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
from pathlib import Path
from urllib.parse import urlparse

_ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(_ROOT / "src"))

from bithumb.config import load_settings  # noqa: E402
from bithumb.operations.vol_breakout_engine import load_vol_state  # noqa: E402
from bithumb.operations.vol_live_monitor import (  # noqa: E402
    fetch_live_balance_snapshot,
    patch_vol_monitor_balance,
    write_vol_monitor,
)

logger = logging.getLogger("vol_monitor")
_refresh_lock = threading.Lock()
_balance_lock = threading.Lock()
_CLIENT_GONE = (BrokenPipeError, ConnectionResetError)


def _client_gone(exc: BaseException) -> bool:
    """브라우저가 응답 전 연결을 끊은 경우."""
    return isinstance(exc, _CLIENT_GONE)


def refresh_vol_live_monitor(*, write_html: bool = True) -> dict:
    """state + DB 캔들 기준 전체 JSON/HTML 갱신."""
    settings = load_settings()
    state = load_vol_state(settings.vol_state_json)
    if settings.ops_mode == "live":
        try:
            bal = fetch_live_balance_snapshot(settings)
            snap = state.setdefault("portfolio_snapshot", {})
            snap["cash_krw"] = bal.get("cash_krw", snap.get("cash_krw"))
            positions = snap.setdefault("positions", {})
            for sym, qty in (bal.get("positions") or {}).items():
                positions[sym] = qty
        except Exception as exc:  # noqa: BLE001
            logger.warning("live balance sync skipped: %s", exc)

    json_path, html_path = write_vol_monitor(settings, state)
    logger.debug("monitor written: %s", json_path)
    if write_html:
        logger.debug("html: %s", html_path)
    return {"ok": True, "json": str(json_path), "html": str(html_path)}


def refresh_vol_live_balance() -> dict:
    """거래소 잔고만 JSON summary 패치."""
    settings = load_settings()
    bal = fetch_live_balance_snapshot(settings)
    return patch_vol_monitor_balance(settings.vol_monitor_json, bal)


def fetch_live_balance() -> dict:
    """서버 /api/balance용."""
    settings = load_settings()
    if settings.ops_mode != "live":
        state = load_vol_state(settings.vol_state_json)
        snap = state.get("portfolio_snapshot") or {}
        return {
            "ok": True,
            "cash_krw": snap.get("cash_krw", 0),
            "positions": snap.get("positions") or {},
            "mode": settings.ops_mode,
        }
    return fetch_live_balance_snapshot(settings)


def _out_dir() -> Path:
    return load_settings().vol_monitor_html.parent


def _api_refresh() -> dict:
    out_dir = _out_dir()
    json_path = out_dir / "vol_live_chart.json"
    with _refresh_lock:
        if not json_path.is_file():
            return refresh_vol_live_monitor(write_html=False)
        return refresh_vol_live_balance()


def _api_balance() -> dict:
    with _balance_lock:
        return fetch_live_balance()


class MonitorHandler(SimpleHTTPRequestHandler):
    """vol_live 정적 파일 + /api/chart · /api/balance · /api/refresh."""

    _static_dir: str | None = None
    _access_log: bool = False

    def __init__(self, *args, **kwargs) -> None:
        if MonitorHandler._static_dir is None:
            MonitorHandler._static_dir = str(_out_dir())
        super().__init__(*args, directory=MonitorHandler._static_dir, **kwargs)

    def _chart_json_path(self) -> Path:
        return Path(self.directory) / "vol_live_chart.json"

    def _serve_chart_json(self) -> None:
        path = self._chart_json_path()
        if not path.is_file():
            self.send_error(404, "chart json not found")
            return
        body: bytes | None = None
        for attempt in range(3):
            try:
                body = path.read_bytes()
                json.loads(body.decode("utf-8"))
                break
            except (json.JSONDecodeError, OSError):
                if attempt >= 2:
                    self.send_error(503, "chart json temporarily unavailable")
                    return
                time.sleep(0.05)
        if body is None:
            self.send_error(503, "chart json unavailable")
            return
        self.send_response(200)
        self.send_header("Content-Type", "application/json; charset=utf-8")
        self.send_header("Cache-Control", "no-store, must-revalidate")
        self.send_header("Content-Length", str(len(body)))
        self.end_headers()
        try:
            self.wfile.write(body)
        except _CLIENT_GONE:
            logger.debug("client disconnected during chart json")

    def log_message(self, fmt: str, *args) -> None:
        """HTTP 접근 로그 — 기본 off (--verbose 시에만 출력)."""
        if not MonitorHandler._access_log:
            return
        logger.info("%s - %s", self.address_string(), fmt % args)

    def log_error(self, fmt: str, *args) -> None:
        """5xx 등 서버 오류만 기록 (favicon 404 제외)."""
        msg = fmt % args
        if "404" in msg and "File not found" in msg:
            return
        logger.warning("%s - %s", self.address_string(), msg)

    def _send_json(self, payload: dict, *, status: int = 200) -> None:
        body = json.dumps(payload, ensure_ascii=False).encode("utf-8")
        try:
            self.send_response(status)
            self.send_header("Content-Type", "application/json; charset=utf-8")
            self.send_header("Cache-Control", "no-store, must-revalidate")
            self.send_header("Content-Length", str(len(body)))
            self.end_headers()
            self.wfile.write(body)
        except _CLIENT_GONE:
            logger.debug("client disconnected before response sent")

    def _handle_refresh(self) -> None:
        try:
            self._send_json(_api_refresh())
        except _CLIENT_GONE:
            pass
        except Exception as exc:  # noqa: BLE001
            if not _client_gone(exc):
                self._send_json({"ok": False, "error": str(exc)}, status=500)

    def _handle_balance(self) -> None:
        try:
            self._send_json(_api_balance())
        except _CLIENT_GONE:
            pass
        except Exception as exc:  # noqa: BLE001
            if not _client_gone(exc):
                self._send_json({"ok": False, "error": str(exc)}, status=500)

    def end_headers(self) -> None:
        if self.path.endswith(".json"):
            self.send_header("Cache-Control", "no-store, must-revalidate")
        super().end_headers()

    def _request_path(self) -> str:
        return urlparse(self.path).path.rstrip("/")

    def do_POST(self) -> None:
        path = self._request_path()
        if path == "/api/refresh":
            self._handle_refresh()
            return
        self.send_error(404, "not found")

    def do_GET(self) -> None:
        path = self._request_path()
        if path == "/api/refresh":
            self._handle_refresh()
            return
        if path == "/api/balance":
            self._handle_balance()
            return
        if path == "/api/chart":
            self._serve_chart_json()
            return
        super().do_GET()


def run_serve(*, access_log: bool = False, quiet: bool = True) -> int:
    """HTTP 서버 기동 (블로킹)."""
    from dotenv import load_dotenv

    MonitorHandler._access_log = access_log
    load_dotenv(_ROOT / ".env", override=False)
    port = int(os.environ.get("VOL_MONITOR_PORT", "8766"))
    out = _out_dir()
    out.mkdir(parents=True, exist_ok=True)
    url = f"http://127.0.0.1:{port}/vol_live_monitor.html"
    if quiet and not access_log:
        print(f"vol monitor {url}  (Ctrl+C 종료)", flush=True)
    else:
        logger.info("모니터: %s", url)
        logger.info("출력 디렉터리: %s", out)
    try:
        server = ThreadingHTTPServer(("127.0.0.1", port), MonitorHandler)
    except OSError as exc:
        if exc.errno == 48:
            logger.error(
                "포트 %s 이미 사용 중 — lsof -iTCP:%s -sTCP:LISTEN 후 종료",
                port,
                port,
            )
        else:
            logger.error("서버 bind 실패: %s", exc)
        return 1
    try:
        server.serve_forever()
    except KeyboardInterrupt:
        logger.info("종료")
    return 0


def main(argv: list[str] | None = None) -> int:
    """CLI — 기본: 갱신 + 서버."""
    parser = argparse.ArgumentParser(
        description="Bithumb vol_live 모니터 (갱신 + HTTP 서버)",
    )
    mode = parser.add_mutually_exclusive_group()
    mode.add_argument(
        "--refresh-only",
        action="store_true",
        help="JSON/HTML 갱신만 (서버 미기동)",
    )
    mode.add_argument(
        "--serve-only",
        action="store_true",
        help="HTTP 서버만 (갱신 생략)",
    )
    parser.add_argument(
        "--balance-only",
        action="store_true",
        help="--refresh-only 와 함께: 잔고 summary만 패치",
    )
    parser.add_argument(
        "-v",
        "--verbose",
        action="store_true",
        help="HTTP 접근·갱신 상세 로그 출력",
    )
    args = parser.parse_args(argv)

    serve_mode = not args.refresh_only
    quiet_serve = serve_mode and not args.verbose
    log_level = logging.INFO if (args.verbose or args.refresh_only) else logging.WARNING
    logging.basicConfig(
        level=log_level,
        format="%(asctime)s [%(levelname)s] %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )

    if not args.serve_only:
        if args.balance_only:
            out = refresh_vol_live_balance()
        else:
            out = refresh_vol_live_monitor()
        if args.verbose or args.refresh_only:
            logger.info("refresh done: %s", out)
        if not out.get("ok"):
            return 1

    if args.refresh_only:
        return 0

    return run_serve(access_log=args.verbose, quiet=quiet_serve)


if __name__ == "__main__":
    raise SystemExit(main())