"""事务与操作日志集成测试：db_session_middleware 的 commit/rollback 分支、operation_log 独立落库。

需真实 MySQL/Redis 运行（默认标记 integration 跳过）。
"""

import pytest
import pymysql

from config import DB_HOST, DB_PORT, DB_DATABASE, DB_USERNAME, DB_PASSWORD

pytestmark = pytest.mark.integration


def _query_count(table, where, *args):
    conn = pymysql.connect(host=DB_HOST, port=int(DB_PORT), user=DB_USERNAME,
                           password=DB_PASSWORD, database=DB_DATABASE)
    cur = conn.cursor()
    cur.execute(f"SELECT COUNT(*) FROM `{table}` WHERE {where}", args)
    n = cur.fetchone()[0]
    conn.close()
    return n


def _execute(sql, *args):
    conn = pymysql.connect(host=DB_HOST, port=int(DB_PORT), user=DB_USERNAME,
                           password=DB_PASSWORD, database=DB_DATABASE)
    cur = conn.cursor()
    cur.execute(sql, args)
    conn.commit()
    conn.close()


_VALID_DEPT = {"name": "测试部门T", "code": "TESTT", "type": 1, "pid": 0, "sort": 99, "status": 1}


@pytest.mark.asyncio
async def test_write_commit_persists(client, admin_headers):
    """业务成功的写操作应被 db_session_middleware 提交。"""
    r = await client.post("/dept/add", headers=admin_headers, json=_VALID_DEPT)
    assert r.json()["code"] == 0
    assert _query_count("fastapi_dept", "name=%s", "测试部门T") >= 1
    # 清理测试数据
    _execute("DELETE FROM fastapi_dept WHERE name=%s", "测试部门T")


@pytest.mark.asyncio
async def test_write_rollback_on_validation_error(client, admin_headers):
    """参数校验失败（code!=0）时请求事务应回滚，不产生脏数据。"""
    before = _query_count("fastapi_dept", "name=%s", "测试部门X")
    r = await client.post("/dept/add", headers=admin_headers, json={"name": "测试部门X"})  # 缺必填字段
    assert r.json()["code"] != 0
    assert _query_count("fastapi_dept", "name=%s", "测试部门X") == before


@pytest.mark.asyncio
async def test_operation_log_persists_on_success(client, admin_headers):
    """成功的写操作后，operation_log 应通过独立会话落库（标题正确）。"""
    before = _query_count("fastapi_operation_log", "1=1")
    r = await client.post("/dept/add", headers=admin_headers, json=_VALID_DEPT)
    assert r.json()["code"] == 0
    after = _query_count("fastapi_operation_log", "1=1")
    assert after >= before + 1, "operation_log 未新增记录"
    _execute("DELETE FROM fastapi_dept WHERE name=%s", "测试部门T")


@pytest.mark.asyncio
async def test_operation_log_persists_on_failure(client, admin_headers):
    """业务失败的写操作也应记录 operation_log（status=1），且独立会话不受请求回滚影响。"""
    # 构造一个通过参数校验但业务失败的操作：部门编码重复（唯一性校验）
    await client.post("/dept/add", headers=admin_headers, json=_VALID_DEPT)
    before = _query_count("fastapi_operation_log", "1=1")
    # 再次添加同名同编码 → 业务失败
    r = await client.post("/dept/add", headers=admin_headers, json=_VALID_DEPT)
    assert r.json()["code"] != 0
    after = _query_count("fastapi_operation_log", "1=1")
    assert after >= before + 1, "业务失败的写操作未记录 operation_log"
    _execute("DELETE FROM fastapi_dept WHERE name=%s", "测试部门T")