"""pytest 全局 fixture（B8 · 开发计划 B8 行）。

- sqlite_engine：内存库 + tests/_ddl.py 单一事实源建表（单测共用）。
- 集成测试（test_integration_risk.py）收集期先调 ensure_risk_demo_ready()：
  本机演示数据未就位（未跑 FLOW §0 ③④）时整模块 skip 并给提示，单测不受影响。
- risk_demo_env（session）：真 MySQL（jinrong_agent/jinrong_core）集成环境，
  setup 幂等代跑 prepare_risk_demo.sql（UPDATE 语义）+ L3 快照，teardown 按
  TRD-TEST- 前缀 + session 时间窗清理测试交易及其预警/校验/审计行，并还原 L3。
  注意：时间窗清理假定测试期间无他人向演示库写入（学习项目单机约定）。
"""

from __future__ import annotations

from datetime import datetime
from pathlib import Path

import pytest
from sqlalchemy import text

from _ddl import create_sqlite_engine

ROOT = Path(__file__).resolve().parent.parent
DEMO_SQL = ROOT / "scripts" / "demo" / "prepare_risk_demo.sql"


@pytest.fixture()
def sqlite_engine():
    """内存 sqlite 全表引擎（B8 前 DDL 散落各测试文件，收敛后统一走这里）。"""
    engine = create_sqlite_engine()
    yield engine
    engine.dispose()


# ---------- 真库集成环境（B8 集成测试专用） ----------


def ensure_risk_demo_ready() -> None:
    """演示数据就位校验（开发计划 B8-a）：缺失则 skip 集成模块并提示 bootstrap。

    在集成测试模块收集期调用；失败 pytest.skip(allow_module_level=True) 只跳过
    该模块，sqlite 单测不受影响。校验口径：CUST-4001 测评 <365 天、AML 名单 ≥8。
    """
    from app.config.settings import settings
    from app.utils.db import get_engine

    hint = "先跑 FLOW §0 ③④：scripts/core/reset.ps1 → 01-mysql-共用底座.sql →" " 02-mysql-agent专用.sql → scripts/agent/seed-aml-list.sql → prepare_risk_demo.sql"
    try:
        core = get_engine(settings.mysql_core_database)
        agent = get_engine(settings.mysql_database)
        with core.connect() as conn:
            days = conn.execute(
                text(
                    "SELECT DATEDIFF(CURDATE(), evaluated_at) FROM core_customer_risk"
                    " WHERE customer_id = 'CUST-4001'"
                )
            ).scalar_one_or_none()
        if days is None or days >= settings.risk_assessment_valid_days:
            pytest.skip(f"演示数据未就位（CUST-4001 测评 {days} 天）：{hint}", allow_module_level=True)
        with agent.connect() as conn:
            aml_count = conn.execute(
                text("SELECT COUNT(*) FROM risk_aml_list WHERE is_active = 1")
            ).scalar_one()
        if aml_count < 8:
            pytest.skip(f"演示数据未就位（AML 名单仅 {aml_count} 条）：{hint}", allow_module_level=True)
    except Exception as exc:
        # pytest.skip 抛出的 Skipped 继承 BaseException，不会被此处吞掉，直接向上传播
        pytest.skip(f"本机 MySQL 不可用（{exc}）：{hint}", allow_module_level=True)


def _run_demo_sql(core_engine) -> None:
    """幂等代跑 prepare_risk_demo.sql（开发计划 B8-b）：文件须保持无存储过程/DELIMITER。"""
    statements = [s.strip() for s in DEMO_SQL.read_text(encoding="utf-8").split(";") if s.strip()]
    with core_engine.begin() as conn:
        for stmt in statements:
            if stmt.upper().startswith("USE "):
                continue  # engine 默认库已由 URL 指定
            conn.execute(text(stmt))


def _cleanup_test_rows(agent_engine, core_engine, started_at: datetime) -> None:
    """TRD-TEST- teardown（开发计划 B8-c）：测试交易及其关联行 + 时间窗兜底 + L3 还原。"""
    with core_engine.begin() as conn:
        conn.execute(text("DELETE FROM core_trade WHERE trade_id LIKE 'TRD-TEST-%'"))
    with agent_engine.begin() as conn:
        conn.execute(text("DELETE FROM risk_alert WHERE trade_id LIKE 'TRD-TEST-%' OR created_at >= :ts"), {"ts": started_at})
        conn.execute(text("DELETE FROM risk_suitability_log WHERE request_ref LIKE 'TRD-TEST-%' OR created_at >= :ts"), {"ts": started_at})
        conn.execute(text("DELETE FROM audit_log WHERE created_at >= :ts"), {"ts": started_at})


@pytest.fixture(scope="session")
def risk_demo_env():
    """真 MySQL 集成环境：setup 快照 L3 → yield engines → teardown 清理 + 引擎 dispose。"""
    from app.config.settings import settings
    from app.utils.db import dispose_engines, get_engine

    core = get_engine(settings.mysql_core_database)
    agent = get_engine(settings.mysql_database)
    started_at = datetime.now()
    l3_snapshot: list = []  # 哨兵：setup 失败时 teardown 不因未绑定变量掩盖原始异常
    try:
        with agent.begin() as conn:
            l3_snapshot = conn.execute(
                text("SELECT * FROM customer_profile_l3")
            ).mappings().all()
        _run_demo_sql(core)
        yield {"agent": agent, "core": core, "started_at": started_at}
    finally:
        try:
            _cleanup_test_rows(agent, core, started_at)
            with agent.begin() as conn:
                conn.execute(text("DELETE FROM customer_profile_l3"))
                for row in l3_snapshot:
                    conn.execute(
                        text(
                            "INSERT INTO customer_profile_l3 (customer_id, monitor_tier,"
                            " risk_score, score_dimensions, monitor_tags, last_alert_id,"
                            " computed_at, updated_at) VALUES (:customer_id, :monitor_tier,"
                            " :risk_score, :score_dimensions, :monitor_tags, :last_alert_id,"
                            " :computed_at, :updated_at)"
                        ),
                        dict(row),
                    )
        finally:
            dispose_engines()