"""
管理会计OS 测试配置

使用 SQLite 内存数据库进行测试，避免依赖外部 MySQL。
测试前自动建表，测试后自动清理。

重要：此文件在pytest收集测试时最先加载，确保环境变量在app模块导入前注入。
"""
import os

# 必须在任何app模块导入之前设置环境变量（通过 pytest.ini 的 python_files 保证加载顺序）
os.environ.setdefault("CMA_DB_USER", "test")
os.environ.setdefault("CMA_DB_PASS", "test")
os.environ.setdefault("CMA_DB_HOST", "localhost")
os.environ.setdefault("CMA_DB_PORT", "3306")
os.environ.setdefault("CMA_DB_NAME", "test")

import pytest
from typing import Generator
from fastapi.testclient import TestClient
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, Session
from sqlalchemy.pool import StaticPool

# 在 import app 模块之前就先覆盖掉 database.py 的 engine
# 方式：直接 monkey-patch database 模块
from app import database as db_module
from app.database import Base

# SQLite 内存引擎
TEST_ENGINE = create_engine(
    "sqlite:///:memory:",
    connect_args={"check_same_thread": False},
    poolclass=StaticPool,
)
TEST_SESSION_LOCAL = sessionmaker(autocommit=False, autoflush=False, bind=TEST_ENGINE)


# MySQL-only 的 date_format() 在 SQLite 下注册等价实现（仅测试库）
# 生产用 MySQL 原生函数；此处仅为让测试能跑通 expenses 月度累计校验/stats 统计
def _sqlite_date_format(dt_val, fmt):
    if dt_val is None:
        return None
    import datetime as _dt
    if isinstance(dt_val, str):
        for f in ("%Y-%m-%d %H:%M:%S", "%Y-%m-%d", "%Y-%m"):
            try:
                dt_val = _dt.datetime.strptime(str(dt_val)[:19], f)
                break
            except ValueError:
                continue
        else:
            return None
    if isinstance(dt_val, _dt.datetime):
        d = dt_val
    elif isinstance(dt_val, _dt.date):
        d = _dt.datetime(dt_val.year, dt_val.month, dt_val.day)
    else:
        return None
    return {
        "%Y": f"{d.year:04d}",
        "%Y-%m": f"{d.year:04d}-{d.month:02d}",
        "%Y-%m-%d": f"{d.year:04d}-{d.month:02d}-{d.day:02d}",
    }.get(fmt)


from sqlalchemy import event  # noqa: E402
event.listen(TEST_ENGINE, "connect", lambda dbapi_conn, rec: dbapi_conn.create_function("date_format", 2, _sqlite_date_format))

# 替换 database 模块的全局引擎
db_module._engine = TEST_ENGINE
db_module._SessionLocal = TEST_SESSION_LOCAL

# 然后导入models（它们依赖Base）
from app.models import (
    User, StrategicMap, KPIDefinition, KPIValue, KPIAlert,
    ActionPlan, OrgNode, StrategicMapVersion,
)
import hashlib


@pytest.fixture(autouse=True)
def setup_db():
    """每个测试函数自动初始化和清理数据库"""
    Base.metadata.create_all(bind=TEST_ENGINE)
    yield
    Base.metadata.drop_all(bind=TEST_ENGINE)


@pytest.fixture
def db() -> Generator[Session, None, None]:
    """提供数据库 session"""
    session = TEST_SESSION_LOCAL()
    try:
        yield session
    finally:
        session.close()


@pytest.fixture
def client(db) -> Generator[TestClient, None, None]:
    """提供测试 HTTP 客户端"""
    from app.main import app
    from app.models import Entity

    # 账套模式：确保测试库存在 entity_id=1 的active实体
    ent = db.query(Entity).filter(Entity.id == 1).first()
    if not ent:
        db.add(Entity(id=1, name="测试企业", short_name="测试", status="active"))
        db.commit()

    # 重写依赖，使用测试数据库
    app.dependency_overrides[db_module.get_db] = lambda: db

    with TestClient(app) as c:
        yield c

    app.dependency_overrides.clear()


# ── 测试数据工厂 ──

def create_test_user(db: Session, **kwargs) -> User:
    """创建测试用户"""
    defaults = {
        "username": "testadmin",
        "password_hash": hashlib.sha256("admin123".encode()).hexdigest(),
        "name": "测试管理员",
        "role": "ceo",
    }
    defaults.update(kwargs)
    user = User(**defaults)
    db.add(user)
    db.commit()
    db.refresh(user)
    return user


def get_token_for_user(client: TestClient, username: str = "testadmin", password: str = "admin123") -> str:
    """获取测试用户的token（账套模式：需entity_id）"""
    resp = client.post("/api/cma/auth/login", json={
        "username": username,
        "password": password,
        "entity_id": 1,
    })
    if resp.status_code != 200:
        raise RuntimeError(f"登录失败: {resp.status_code} {resp.text[:300]}")
    data = resp.json()
    return data.get("token") or data.get("access_token")


def auth_header(token: str) -> dict:
    return {"Authorization": f"Bearer {token}"}


def create_test_kpi(db: Session, **kwargs) -> KPIDefinition:
    """创建测试KPI"""
    defaults = {
        "kpi_code": "TEST_001",
        "kpi_name": "测试KPI",
        "dimension": "finance",
        "target_value": 100.0,
        "unit": "%",
        "status": "active",
    }
    defaults.update(kwargs)
    kpi = KPIDefinition(**defaults)
    db.add(kpi)
    db.commit()
    db.refresh(kpi)
    return kpi


def create_test_map(db: Session, **kwargs) -> StrategicMap:
    """创建测试战略地图"""
    defaults = {
        "title": "测试地图",
        "status": "draft",
        "dimensions": [
            {"key": "finance", "name": "财务维度", "icon": "💰", "color": "#409eff", "objectives": []},
            {"key": "customer", "name": "客户维度", "icon": "🤝", "color": "#67c23a", "objectives": []},
        ],
        "canvas_data": {"connections": []},
    }
    defaults.update(kwargs)
    m = StrategicMap(**defaults)
    db.add(m)
    db.commit()
    db.refresh(m)
    return m