"""日志接收（合并原 xtc-log-receiver.mjs）。

端点：
- POST /logs/api/log      单条日志
- POST /logs/api/log/batch 批量日志
- GET  /logs/api/stats    统计
- GET  /logs/api/logs     查询（admin）
"""
from __future__ import annotations

import json
import time
from typing import Any, Optional

from fastapi import APIRouter, Depends, Query

from ..auth import require_admin_key
from ..database import get_conn
from ._common import ok_with_cors

router = APIRouter(prefix="/logs/api", tags=["logs"])


def _insert_log(level: str, module: str, event: str, trace_id: Optional[str], data: Any) -> None:
    now = int(time.time())
    data_str = json.dumps(data, ensure_ascii=False) if data is not None else None
    with get_conn() as conn:
        conn.execute(
            "INSERT INTO app_logs(ts, level, module, event, trace_id, data) VALUES(?,?,?,?,?,?)",
            (now, level, module, event, trace_id, data_str),
        )


@router.post("/log")
async def post_log(body: dict) -> dict:
    level = str(body.get("level") or "info").lower()
    module = str(body.get("module") or "client")
    event = str(body.get("event") or "log")
    trace_id = body.get("traceId") or body.get("trace_id")
    data = body.get("data") or body
    _insert_log(level, module, event, trace_id, data)
    return ok_with_cors({"accepted": True})


@router.post("/log/batch")
async def post_log_batch(body: dict) -> dict:
    items = body.get("logs") or body.get("items") or []
    if not isinstance(items, list):
        items = []
    count = 0
    for item in items:
        if not isinstance(item, dict):
            continue
        _insert_log(
            str(item.get("level") or "info").lower(),
            str(item.get("module") or "client"),
            str(item.get("event") or "log"),
            item.get("traceId") or item.get("trace_id"),
            item.get("data") or item,
        )
        count += 1
    return ok_with_cors({"accepted": count})


@router.get("/stats")
async def stats(
    hours: int = Query(default=24, ge=1, le=720),
    _admin: str = Depends(require_admin_key),
) -> dict:
    since = int(time.time()) - hours * 3600
    with get_conn() as conn:
        by_level = conn.execute(
            "SELECT level, COUNT(*) as c FROM app_logs WHERE ts >= ? GROUP BY level",
            (since,),
        ).fetchall()
        by_module = conn.execute(
            "SELECT module, COUNT(*) as c FROM app_logs WHERE ts >= ? GROUP BY module ORDER BY c DESC LIMIT 20",
            (since,),
        ).fetchall()
        total = conn.execute(
            "SELECT COUNT(*) as c FROM app_logs WHERE ts >= ?", (since,)
        ).fetchone()
    return ok_with_cors(
        {
            "hours": hours,
            "total": int(total["c"]) if total else 0,
            "by_level": {r["level"]: int(r["c"]) for r in by_level},
            "by_module": {r["module"]: int(r["c"]) for r in by_module},
        }
    )


@router.get("/logs")
async def list_logs(
    hours: int = Query(default=24, ge=1, le=720),
    level: Optional[str] = Query(default=None),
    limit: int = Query(default=200, ge=1, le=2000),
    offset: int = Query(default=0, ge=0),
    _admin: str = Depends(require_admin_key),
) -> dict:
    since = int(time.time()) - hours * 3600
    sql = "SELECT id, ts, level, module, event, trace_id, data FROM app_logs WHERE ts >= ?"
    args: list = [since]
    if level:
        sql += " AND level = ?"
        args.append(level.lower())
    sql += " ORDER BY ts DESC, id DESC LIMIT ? OFFSET ?"
    args += [limit, offset]
    with get_conn() as conn:
        rows = conn.execute(sql, args).fetchall()
    items = []
    for r in rows:
        try:
            data = json.loads(r["data"]) if r["data"] else None
        except Exception:
            data = r["data"]
        items.append(
            {
                "id": int(r["id"]),
                "ts": int(r["ts"]),
                "level": r["level"],
                "module": r["module"],
                "event": r["event"],
                "trace_id": r["trace_id"],
                "data": data,
            }
        )
    return ok_with_cors({"items": items, "count": len(items)})