"""
Garmin sync service.

Pulls up to 7 days of daily summaries + activities through the `garminconnect`
library and upserts them. The library and real Garmin credentials are required
to actually run a sync; without them the endpoint reports a clear error instead
of crashing (mirrors the original Node behaviour).

Garmin credentials: the app only stores a scrypt *hash* of the Garmin password
(so it cannot be recovered), therefore a live sync needs the plaintext
garminEmail/garminPassword supplied in the request body.
"""
import datetime

from db import execute, query_one, query_all
from config import DB_TYPE
from services import health


def _set_sync_status(user_id, status, now, **fields):
    cols = ["user_id", "status", "last_sync_time"] + list(fields.keys())
    placeholders = ", ".join(["?"] * len(cols))
    if DB_TYPE == "mariadb":
        updates = ", ".join(
            f"{c}=VALUES({c})" for c in cols if c != "user_id"
        )
        sql = (
            f"INSERT INTO sync_status ({', '.join(cols)}) VALUES ({placeholders}) "
            f"ON DUPLICATE KEY UPDATE {updates}"
        )
    else:
        updates = ", ".join(
            f"{c}=excluded.{c}" for c in cols if c != "user_id"
        )
        sql = (
            f"INSERT INTO sync_status ({', '.join(cols)}) VALUES ({placeholders}) "
            f"ON CONFLICT(user_id) DO UPDATE SET {updates}"
        )
    params = [user_id, status, now] + list(fields.values())
    execute(sql, params)


def get_sync_status(user_id):
    row = query_one("SELECT * FROM sync_status WHERE user_id = ?", [user_id])
    if not row:
        return {
            "status": "idle",
            "lastSyncTime": None,
            "recordsSynced": 0,
            "lastError": None,
        }
    return {
        "status": row["status"],
        "lastSyncTime": row["last_sync_time"],
        "recordsSynced": row["records_synced"],
        "lastError": row["last_error"],
    }


def sync_data(user_id, creds):
    now = datetime.datetime.utcnow().isoformat()
    _set_sync_status(user_id, "syncing", now, records_synced=0)

    try:
        try:
            from garminconnect import Garmin
        except ImportError:
            raise RuntimeError(
                "GARMIN_LIB_MISSING: 请先运行 `pip install garminconnect` 以启用同步"
            )

        client = Garmin(email=creds["garminEmail"], password=creds["garminPassword"])
        client.login()

        records_synced = 0
        for i in range(7):
            d = datetime.datetime.utcnow() - datetime.timedelta(days=i)
            date_str = d.strftime("%Y-%m-%d")
            try:
                daily = client.get_user_summary(date_str)
                if daily:
                    sleep_sec = (daily.get("sleep") or {}).get("sleepingSeconds") or daily.get(
                        "sleepingSeconds"
                    )
                    health.upsert_health_daily(
                        user_id,
                        {
                            "date": date_str,
                            "steps": daily.get("steps"),
                            "heartRate": daily.get("restingHeartRate")
                            or daily.get("averageHeartRate"),
                            "heartRateVariability": daily.get("hrv")
                            or daily.get("heartRateVariability"),
                            "sleepDuration": round(sleep_sec / 3600, 1) if sleep_sec else None,
                            "sleepQuality": (daily.get("sleep") or {}).get("sleepQuality"),
                            "stress": (daily.get("stress") or {}).get("average")
                            or daily.get("averageStress"),
                            "caloriesBurned": (daily.get("calories") or {}).get("total")
                            or daily.get("totalCalories"),
                        },
                    )
                    records_synced += 1

                activities = client.get_activities(date_str) or []
                for a in activities or []:
                    start = a.get("startTimeLocal") or a.get("startTime")
                    start_ms = start and datetime.datetime.strptime(
                        start, "%Y-%m-%dT%H:%M:%S" if "T" in (start or "") else "%Y-%m-%d %H:%M:%S"
                    ).timestamp() if start else None
                    health.insert_activity(
                        user_id,
                        {
                            "activityType": (a.get("activityType") or {}).get("typeKey")
                            or a.get("type")
                            or "unknown",
                            "startTime": start,
                            "endTime": (
                                start
                                if start_ms is None or not a.get("duration")
                                else datetime.datetime.utcfromtimestamp(
                                    start_ms + (a.get("duration") or 0)
                                ).isoformat()
                            ),
                            "duration": a.get("duration"),
                            "distance": a.get("distance"),
                            "calories": a.get("calories"),
                            "heartRateAverage": a.get("averageHR"),
                            "heartRateMax": a.get("maxHR"),
                        },
                    )
            except Exception:
                # skip a single bad day and continue
                continue

        _set_sync_status(user_id, "idle", now, records_synced=records_synced)
        return {
            "status": "success",
            "recordsSynced": records_synced,
            "message": f"同步完成，新增/更新 {records_synced} 天数据",
            "lastSyncTime": now,
        }
    except Exception as e:
        message = str(e)
        _set_sync_status(user_id, "error", now, records_synced=0, last_error=message)
        return {
            "status": "error",
            "recordsSynced": 0,
            "message": message,
            "lastSyncTime": now,
        }