"""单据编号唯一键冲突重试的行为锁定（audit 上下文内循环重试）。

守：1062 兜底重试若以「吞异常后 return 重入整个 create_*」实现，会产生
三重缺陷 —— 外层审计把已回滚的首次尝试记成 success=True（假成功，与
audit_service.py「上下文内不得吞掉异常后正常退出」的约定相反）、重试再
开一层审计（违反「不支持嵌套」）、持续冲突时递归至 RecursionError。
修复口径：审计上下文内 for 循环重试（上限 _NO_RETRY），成功/最终失败
各恰好一条操作日志（以 POST 前的日志条数为基线断言增量）。

制造冲突的手段：monkeypatch ``business_service._generate_no`` 首次返回
库内已存在编号 → flush 撞唯一键 → 走重试分支。审计按 username 冗余溯
源（账号删除后 user_id 被 SET NULL），断言以基线增量免受既有数据干扰。
"""

import uuid

import pytest
from fastapi.testclient import TestClient
from sqlalchemy import func, select

from app.core.constants import ACTION_CREATE, MODULE_BUSINESS
from app.core.db import get_session_factory
from app.main import app
from app.models import OperationLog
from app.services import business_service

pytestmark = pytest.mark.integration

_BUSINESSES = "/api/v1/business/businesses"
_CUSTOMERS = "/api/v1/base/customers"


@pytest.fixture
def quiet_client():
    """持续冲突用例依赖全局异常处理器产出 500 信封。

    TestClient 默认对 ServerErrorMiddleware 的响应直接 re-raise
    （raise_server_exceptions=True），会掩盖「原子处理器已正确收敛 500」
    的行为本身 —— 审计断言反而无从谈起。
    """
    return TestClient(app, raise_server_exceptions=False)


def _customer(client: TestClient, headers: dict) -> int:
    resp = client.post(
        _CUSTOMERS,
        json={
            "company_name": f"t_retry公司_{uuid.uuid4().hex[:8]}",
            "owner_name": "张老板",
            "customer_type": "personal",
        },
        headers=headers,
    )
    assert resp.status_code == 200, resp.text
    return int(resp.json()["data"]["id"])


def _business_payload(customer_id: int) -> dict:
    return {
        "customer_id": customer_id,
        "business_date": "2026-01-01",
        "items": [
            {
                "product_name": f"t_产品_{uuid.uuid4().hex[:8]}",
                "product_category": "municipal_water",
                "quantity": "1.00",
                "sale_price": "10.00",
            }
        ],
    }


def _log_count(username: str, *, success: bool) -> int:
    """按操作人统计「创建业务」操作日志条数（日志按 username 冗余追溯）。"""
    factory = get_session_factory()
    with factory() as session:
        stmt = (
            select(func.count())
            .select_from(OperationLog)
            .where(
                OperationLog.username == username,
                OperationLog.module == MODULE_BUSINESS,
                OperationLog.action == ACTION_CREATE,
                OperationLog.summary.like("创建业务%"),
                OperationLog.success == int(success),
            )
        )
        return int(session.execute(stmt).scalar_one())


def _baseline(normal: dict) -> tuple[int, int]:
    """POST 前的「创建业务」成功/失败日志条数基线（免受既有数据干扰）。"""
    return (
        _log_count(normal["username"], success=True),
        _log_count(normal["username"], success=False),
    )


class TestAuditRetry:
    """重试成功与持续失败两条路径的审计记录数。"""

    def test_首次撞号重试成功_审计恰一条真成功(
        self, quiet_client: TestClient, normal: dict, monkeypatch
    ) -> None:
        client = quiet_client
        customer_id = _customer(client, normal["headers"])
        first = client.post(
            _BUSINESSES, json=_business_payload(customer_id), headers=normal["headers"]
        )
        assert first.status_code == 200, first.text
        existing_no = first.json()["data"]["business_no"]

        real_generate = business_service._generate_no
        calls = {"n": 0}

        def flaky_generate(session):
            calls["n"] += 1
            if calls["n"] == 1:
                return existing_no  # 首次返回库内已存在编号 → flush 撞 1062
            return real_generate(session)

        monkeypatch.setattr(business_service, "_generate_no", flaky_generate)
        base_ok, base_fail = _baseline(normal)

        second = client.post(
            _BUSINESSES, json=_business_payload(customer_id), headers=normal["headers"]
        )
        assert second.status_code == 200, second.text
        assert calls["n"] == 2, "重试应恰好再取一次号"
        # 修复前的症状：外层审计正常退出记 success=True（假成功），重试成功
        # 又记一条 —— 成功日志增量为 2；修复后成功恰 +1、失败 +0
        assert _log_count(normal["username"], success=True) == base_ok + 1
        assert _log_count(normal["username"], success=False) == base_fail

    def test_持续冲突_最终失败且审计恰一条失败(
        self, quiet_client: TestClient, normal: dict, monkeypatch
    ) -> None:
        client = quiet_client
        customer_id = _customer(client, normal["headers"])
        first = client.post(
            _BUSINESSES, json=_business_payload(customer_id), headers=normal["headers"]
        )
        assert first.status_code == 200, first.text
        existing_no = first.json()["data"]["business_no"]

        def always_conflict(session):
            return existing_no

        monkeypatch.setattr(business_service, "_generate_no", always_conflict)
        base_ok, base_fail = _baseline(normal)

        second = client.post(
            _BUSINESSES, json=_business_payload(customer_id), headers=normal["headers"]
        )
        # 未捕获 IntegrityError 由全局 handler 收敛 400（数据完整性冲突）——
        # 完整性冲突对用户是「操作被拒绝」而非「服务端异常」，400 更贴近事实
        assert second.status_code == 400, second.text
        assert "完整性冲突" in second.json()["message"]
        # 修复前的症状:return _retry_create 无界递归直至 RecursionError,
        # 每层各写一条记录；修复后重试有上限,最终失败仅一条失败日志
        assert _log_count(normal["username"], success=False) == base_fail + 1
        assert _log_count(normal["username"], success=True) == base_ok