"""Garmin routes: bind a Garmin account, trigger a sync, read sync status.

Deliberately independent of the `users` identity: this blueprint reads and
writes only `garmin_tokens` and the sync-status tables, keyed by `g.user_id`.
Web login (routes/auth.py, via auth-hub) establishes who `g.user_id` is;
whether that account has a Garmin binding at all is this blueprint's
business alone, and the two are meant to be operable independently — see
services/garmin.py's `get_remembered_email` for the one deliberate,
backward-compatible read of the legacy `users.garmin_email` column.
"""
from flask import Blueprint, request, g, jsonify

from auth import require_auth
from services import garmin as garmin_svc
from services import garmin_auth
from services import scheduler

bp = Blueprint("garmin", __name__)


@bp.route("/sync", methods=["POST"])
@require_auth
def sync():
    data = request.get_json(silent=True) or {}
    creds = {
        "garminEmail": (data.get("garminEmail") or "").strip(),
        "garminPassword": data.get("garminPassword") or "",
    }
    # Fall back to the remembered Garmin email when only a password is supplied.
    if not creds["garminEmail"]:
        creds["garminEmail"] = garmin_svc.get_remembered_email(g.user_id)

    # With stored OAuth tokens no password is needed at all. Without them the
    # plaintext password must come in the body, because only a hash is kept.
    if not creds["garminPassword"] and not garmin_svc.has_token(g.user_id):
        return (
            jsonify({
                "status": "error",
                "recordsSynced": 0,
                "message": "需要 Garmin 密码以执行同步，请在请求体中提供 garminPassword"
                "（密码仅作哈希存储，无法还原）。",
            }),
            400,
        )

    days = request.get_json(silent=True).get("days") if request.is_json else None
    try:
        days = max(1, min(int(days), 730)) if days else None
    except (TypeError, ValueError):
        days = None

    # Always run in the background: even a week takes ~20s, and a full
    # backfill runs for many minutes. Progress is polled via /status.
    result = garmin_svc.start_sync(g.user_id, creds, days)
    return jsonify(result), 202


@bp.route("/auth-status", methods=["GET"])
@require_auth
def auth_status():
    """Whether a stored token exists, so the UI knows to ask for a password."""
    return jsonify({"hasToken": garmin_svc.has_token(g.user_id)})


@bp.route("/disconnect", methods=["POST"])
@require_auth
def disconnect():
    """Drop the stored Garmin token so the next sync must re-authenticate.

    Deletes the OAuth token (the UI calls this a "退出 Garmin 账号"). garmin_email
    stays on the user record, so re-login only needs the password again. Already
    synced health data is untouched.
    """
    garmin_svc.delete_token(g.user_id)
    return jsonify({
        "ok": True,
        "message": "已退出 Garmin 账号，已保存的授权令牌已删除，下次同步需重新登录获取新令牌。",
    })


@bp.route("/login", methods=["POST"])
@require_auth
def login():
    """Begin an interactive Garmin login.

    Returns immediately with a session id; the login continues in the
    background and parks if Garmin asks for a two-factor code. Poll
    /login-status and post the code to /mfa.
    """
    data = request.get_json(silent=True) or {}
    password = data.get("garminPassword") or ""
    if not password:
        return jsonify({"error": "请提供 Garmin 密码"}), 400

    garmin_email = (data.get("garminEmail") or "").strip()
    if not garmin_email:
        garmin_email = garmin_svc.get_remembered_email(g.user_id)
    if not garmin_email:
        return jsonify({"error": "缺少 Garmin 邮箱"}), 400

    session_id = garmin_auth.start_login(g.user_id, garmin_email, password)
    return jsonify({"session": session_id, "status": "starting"}), 202


@bp.route("/login-status", methods=["GET"])
@require_auth
def login_status():
    session_id = request.args.get("session") or ""
    row = garmin_auth.get_session(session_id, g.user_id)
    if not row:
        return jsonify({"error": "登录会话不存在或已过期"}), 404
    return jsonify({
        "session": row["id"],
        "status": row["status"],
        "error": row["error"],
    })


@bp.route("/mfa", methods=["POST"])
@require_auth
def submit_mfa():
    data = request.get_json(silent=True) or {}
    session_id = (data.get("session") or "").strip()
    code = (data.get("code") or "").strip()
    if not session_id or not code:
        return jsonify({"error": "session 与 code 均为必填"}), 400

    ok, message = garmin_auth.submit_code(session_id, g.user_id, code)
    return jsonify({"ok": ok, "message": message}), (200 if ok else 400)


@bp.route("/login", methods=["DELETE"])
@require_auth
def cancel_login():
    session_id = request.args.get("session") or ""
    garmin_auth.cancel(session_id, g.user_id)
    return jsonify({"ok": True})


@bp.route("/status", methods=["GET"])
@require_auth
def status():
    return jsonify(garmin_svc.get_sync_status(g.user_id))


@bp.route("/sync-latest", methods=["POST"])
@require_auth
def sync_latest():
    """Pull just the last couple of days.

    Separate from /sync because it is fast enough to wait for (a few seconds
    rather than minutes), so the UI can report the result directly instead of
    handing back a job to poll.
    """
    if not garmin_svc.has_token(g.user_id):
        return jsonify({"error": "尚未绑定 Garmin 账号"}), 400

    days = request.get_json(silent=True) or {}
    try:
        window = max(1, min(int(days.get("days", scheduler.SYNC_DAYS)), 7))
    except (TypeError, ValueError):
        window = scheduler.SYNC_DAYS

    return jsonify(garmin_svc.sync_data(g.user_id, {}, days=window))


@bp.route("/auto-sync", methods=["GET"])
@require_auth
def auto_sync_status():
    """When the scheduler last ran, and when this account is next due."""
    return jsonify(scheduler.status(g.user_id))


@bp.route("/activities/<activity_id>/detail", methods=["GET"])
@require_auth
def activity_detail(activity_id):
    """Everything stored for one activity: stats, laps, zones, series.

    A local read. Detail is fetched during the sync rather than when the user
    taps an activity — seven Garmin calls on the critical path of a tap was
    slow on a good connection and a timeout on a bad one.
    """
    detail = garmin_svc.read_activity_detail(g.user_id, activity_id)
    if detail is None:
        return jsonify({
            "error": "这条运动的详细数据还没同步到本机，去「同步」页拉一次即可。",
            "needsSync": True,
        }), 404
    return jsonify(detail)


@bp.route("/sync-details", methods=["POST"])
@require_auth
def sync_details():
    """Backfill activity details and daily curves for existing history."""
    if not garmin_svc.has_token(g.user_id):
        return jsonify({"error": "尚未绑定 Garmin 账号"}), 400

    body = request.get_json(silent=True) or {}
    try:
        limit = int(body["limit"]) if body.get("limit") else None
    except (TypeError, ValueError):
        limit = None

    return jsonify(garmin_svc.start_backfill(g.user_id, limit)), 202


@bp.route("/sync-details", methods=["GET"])
@require_auth
def sync_details_status():
    return jsonify(garmin_svc.backfill_status(g.user_id))