import os
import sys
import tempfile

vendor_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "_vendor"))
if os.path.isdir(vendor_dir) and vendor_dir not in sys.path:
    sys.path.insert(0, vendor_dir)

src_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "src"))
if os.path.isdir(src_dir) and src_dir not in sys.path:
    sys.path.insert(0, src_dir)

import pytest
from httpx import AsyncClient, ASGITransport
from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
from sqlalchemy import select

from fastapi import FastAPI, APIRouter
from inventory.api import inventory_router
from shared.models.database import (
    Base, User, Customer, Warehouse, Supplier, Product, ProductMaterial,
    Inventory, MaterialSupplier, SalesOrder, SalesOrderItem,
)
from shared.database.database import get_db_session
from shared.services.auth_service import get_current_active_user


@pytest.fixture(scope="session")
def anyio_backend():
    return "asyncio"


@pytest.fixture(scope="session")
def sqlite_db_path():
    fd, path = tempfile.mkstemp(prefix="gemold_test_", suffix=".db")
    os.close(fd)
    yield path
    try:
        os.remove(path)
    except OSError:
        pass


@pytest.fixture(scope="session")
async def async_engine(sqlite_db_path):
    engine = create_async_engine(f"sqlite+aiosqlite:///{sqlite_db_path}", future=True)
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield engine
    await engine.dispose()


@pytest.fixture(scope="function")
async def seeded_db(async_engine):
    """每个测试前清空所有表并重新播种，确保隔离。"""
    session_factory = async_sessionmaker(async_engine, class_=AsyncSession, expire_on_commit=False)
    async with session_factory() as session:
        # 按 FK 依赖逆序清空所有表
        for table in reversed(Base.metadata.sorted_tables):
            await session.execute(table.delete())
        await session.commit()

    async with session_factory() as session:
        user = User(
            id=1,
            username="tester",
            email="tester@example.com",
            hashed_password="x",
            full_name="Tester",
            is_active=True,
        )
        customer = Customer(id=1, code="C001", name="客户A", is_active=True)
        supplier = Supplier(id=1, code="S001", name="供应商A", is_active=True)
        warehouse = Warehouse(id=1, code="W001", name="默认仓库", is_active=True, is_default=True)

        material = Product(
            id=1,
            sku="MAT-001",
            name="钢材",
            unit="kg",
            item_type="material",
            cost_price=10.0,
            sale_price=0,
            min_stock=0,
            max_stock=100000,
            is_active=True,
        )
        finished = Product(
            id=2,
            sku="MOLD-STD",
            name="标准模具",
            unit="套",
            item_type="finished",
            cost_price=0,
            sale_price=1000.0,
            min_stock=0,
            max_stock=0,
            is_active=True,
        )
        # 成品无 BOM，用于测试 BOM 缺失路径
        finished_no_bom = Product(
            id=3,
            sku="MOLD-NB",
            name="无BOM成品",
            unit="套",
            item_type="finished",
            cost_price=0,
            sale_price=500.0,
            min_stock=0,
            max_stock=0,
            is_active=True,
        )
        bom = ProductMaterial(
            id=1,
            finished_product_id=finished.id,
            material_product_id=material.id,
            quantity=2.0,
            loss_rate=0.05,
        )
        inv = Inventory(
            id=1,
            product_id=material.id,
            warehouse_id=warehouse.id,
            quantity=1000,
            locked_quantity=0,
        )
        # 物料-供应商关联（用于采购需求推导测试）
        ms = MaterialSupplier(
            id=1,
            product_id=material.id,
            supplier_id=supplier.id,
            is_primary=True,
            lead_time=7,
        )

        session.add_all([user, customer, supplier, warehouse, material, finished, finished_no_bom, bom, inv, ms])
        await session.commit()

    async with session_factory() as session:
        yield session


@pytest.fixture(scope="function")
async def client(async_engine, seeded_db):
    session_factory = async_sessionmaker(async_engine, class_=AsyncSession, expire_on_commit=False)

    test_app = FastAPI()
    test_app.include_router(inventory_router)

    async def override_get_db_session():
        async with session_factory() as session:
            yield session

    async def override_get_current_active_user():
        async with session_factory() as session:
            result = await session.execute(select(User).where(User.username == "tester"))
            return result.scalar_one()

    test_app.dependency_overrides[get_db_session] = override_get_db_session
    test_app.dependency_overrides[get_current_active_user] = override_get_current_active_user

    transport = ASGITransport(app=test_app)
    async with AsyncClient(transport=transport, base_url="http://test") as ac:
        yield ac

    test_app.dependency_overrides.clear()