"""账号事件流：写入与查询。

## 定位

`accounts` 存**当前状态**（积分、余额、开通标记），这张表存**发生过什么**。
账号详情页 = 状态卡（读 `accounts`）+ 时间线（读本表）。

## 两条写入路径

1. **直接发射**（`emit`）：CK 失效/登录成功/重登、精英宝典与电竞手册开通 —— 这些
   只在内存里出现过，不记就永远没有；
2. **增量收集**（`automation/jobs/account_events_collect.py`）：充值/兑换/积分到账/绑定 ——
   这些已经是 `douyu_tasks` 的行，由收集器按水位线往后提取，不动 runner 代码。
   本模块只提供 `_task_to_event` 映射给它用。

## 两条硬约束

- **发射是旁路**：`emit` 任何失败都不能影响登录/兑换主流程（内部吞异常 + 记日志，
  并用 SAVEPOINT 隔离，避免污染调用方的事务）；
- **幂等**：`source_ref` 唯一键兜住「收集器重跑」「事件重复发射」。没有它，重跑一次
  时间线就多一份重复记录。
"""

from __future__ import annotations

import json
from datetime import UTC, datetime
from typing import Any

from loguru import logger
from sqlalchemy import text
from sqlalchemy.orm import Session

# ── 事件类型 ──────────────────────────────────────────────
# 命名保持「名词_状态」风格，便于前端归类与筛选。
EVENT_IMPORTED = "imported"  # 账号导入（读 accounts.created_at，一般不落表）
EVENT_LOGIN_OK = "login_ok"  # 登录成功（含新 CK）
EVENT_CK_INVALID = "ck_invalid"  # CK 判定失效
EVENT_RELOGIN_OK = "relogin_ok"  # 自动重登成功
EVENT_RELOGIN_FAILED = "relogin_failed"  # 自动重登失败（转人工/退避）
EVENT_BIND_OK = "bind_ok"  # 绑定/换绑
EVENT_RECHARGE = "recharge"  # 充值到账
EVENT_EXCHANGE = "exchange"  # 兑换（含消耗积分）
EVENT_POINTS_CREDIT = "points_credit"  # 积分到账（含到期时间）
EVENT_ELITE_OPENED = "elite_opened"  # 精英宝典开通
EVENT_ESPORTS_OPENED = "esports_opened"  # 电竞手册开通
EVENT_ASSIGNED = "assigned"  # 分配客服
EVENT_TAG_CHANGED = "tag_changed"  # 标签变更

# 有符号金额的事件类型（用于页面「累计充值/累计消耗」）：
# 充值为正、兑换为负，其余不计入金额统计。
INCOME_TYPES = (EVENT_RECHARGE,)
OUTCOME_TYPES = (EVENT_EXCHANGE,)


def _now() -> datetime:
    return datetime.now(UTC)


def emit(
    db: Session,
    *,
    account_id: int,
    event_type: str,
    title: str,
    occurred_at: datetime | None = None,
    amount: int | None = None,
    balance_after: int | None = None,
    detail: dict[str, Any] | None = None,
    source: str = "manual",
    source_ref: str | None = None,
) -> bool:
    """记录一条账号事件。返回是否真的写入（幂等命中/异常时为 False）。

    **绝不抛异常**：事件是旁路，不能因为记不上一条时间线就让登录或兑换失败。
    用 SAVEPOINT 包住，失败只回滚这一条，不影响调用方已经做过的事。
    """
    if not account_id or not event_type:
        return False

    sql = text(
        """
        INSERT INTO account_events (
            account_id, event_type, occurred_at, title,
            amount, balance_after, detail, source, source_ref, created_at
        ) VALUES (
            :account_id, :event_type, :occurred_at, :title,
            :amount, :balance_after, :detail, :source, :source_ref, :created_at
        )
        """
    )
    params = {
        "account_id": account_id,
        "event_type": event_type,
        "occurred_at": (occurred_at or _now()).astimezone(UTC).replace(tzinfo=None),
        "title": (title or "")[:256],
        "amount": amount,
        "balance_after": balance_after,
        "detail": json.dumps(detail, ensure_ascii=False, default=str)
        if detail
        else None,
        "source": source[:24],
        "source_ref": (source_ref or None),
        "created_at": _now().replace(tzinfo=None),
    }

    try:
        # SAVEPOINT：即使这条插入失败（例如 source_ref 撞唯一键），
        # 也只回滚它自己，调用方事务里已完成的写入不受影响。
        with db.begin_nested():
            db.execute(sql, params)
        return True
    except Exception as exc:  # noqa: BLE001 - 旁路，任何失败都不上抛
        logger.warning(f"写入账号事件失败（account={account_id} {event_type}）：{exc}")
        return False


# ── douyu_tasks 增量收集 ──────────────────────────────────
# 只收集「业务事件」，例行轮询（query_*）一律不进时间线 —— 它们在 douyu_tasks 里
# 占绝大多数（query_limited_goods 就 6.7 万行），收进去时间线没法看。
COLLECTED_TASK_TYPES = (
    "exchange_goods",
    "create_gold_qr",
    "donate_elite_gift",
    "confirm_bind",
    "confirm_esports_bind",
)


def _task_to_event(task_type: str, result: Any) -> dict[str, Any] | None:
    """把一条 douyu_tasks 行转成事件参数；解析不出返回 None（跳过并告警）。

    ⚠️ 字段路径是**抽样实测**得到的（见设计文档 §4.2），不是猜的。
    解析不出时必须跳过而不是抛出去 —— 一行坏数据不能卡住整条水位线。
    """
    if isinstance(result, str):
        try:
            result = json.loads(result)
        except ValueError:
            return None
    if not isinstance(result, dict):
        return None

    if task_type == "exchange_goods":
        name = result.get("commodity_name") or "兑换"
        score = result.get("score")
        points_after = (result.get("points_query") or {}).get("points")
        return {
            "event_type": EVENT_EXCHANGE,
            "title": f"兑换 {name}",
            "amount": -int(score) if isinstance(score, (int, float)) else None,
            "balance_after": points_after if isinstance(points_after, int) else None,
            "detail": {
                "commodity_name": name,
                "commodity_id": result.get("commodity_id"),
                "order_id": result.get("order_id"),
                "exchange_id": result.get("exchange_id"),
                "game_name": result.get("game_name"),
                "game_channel": result.get("game_channel"),
                "score": score,
            },
        }

    if task_type == "create_gold_qr":
        amount = result.get("buy_num") or result.get("pay_amount")
        supplier = result.get("supplier_order") or {}
        try:
            amount_int = int(float(amount)) if amount is not None else None
        except (TypeError, ValueError):
            amount_int = None
        return {
            "event_type": EVENT_RECHARGE,
            "title": f"充值 {amount_int if amount_int is not None else ''}".strip(),
            "amount": amount_int,
            "balance_after": None,
            "detail": {
                "order_id": result.get("order_id"),
                "supplier_order_id": supplier.get("order_id"),
                "supplier_finished_at": supplier.get("finish_time"),
                "channel": result.get("recharge_channel"),
                "douyu_uid": result.get("douyu_uid"),
            },
        }

    if task_type == "donate_elite_gift":
        gain = result.get("gift_points_expected_gain")
        points = result.get("points")
        will_expire = ((result.get("points_query") or {}).get("raw") or {}).get("data")
        expire_at = (
            will_expire.get("willExpireTime") if isinstance(will_expire, dict) else None
        )
        return {
            "event_type": EVENT_POINTS_CREDIT,
            "title": f"积分到账 +{gain}" if gain is not None else "积分到账",
            "amount": int(gain) if isinstance(gain, (int, float)) else None,
            "balance_after": int(points) if isinstance(points, (int, float)) else None,
            "detail": {
                "baseline": result.get("gift_points_baseline"),
                "target": result.get("gift_points_target"),
                "points_expire_at": expire_at,
                "gold_balance": result.get("gold_balance"),
            },
        }

    if task_type in ("confirm_bind", "confirm_esports_bind"):
        return {
            "event_type": EVENT_BIND_OK,
            "title": "绑定角色" if task_type == "confirm_bind" else "电竞手册绑定",
            "amount": None,
            "balance_after": None,
            "detail": {"raw_keys": sorted(result.keys())[:20]},
        }

    return None