import pytest
import asyncio
from typing import AsyncGenerator
from httpx import AsyncClient, ASGITransport
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker
import sys
import os

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from app.main import app
from app.database import Base, get_db
from app.models.user import User
from app.core.security import hash_password


TEST_DATABASE_URL = "postgresql+asyncpg://admin:dWFNi67nHNbPbjmP@localhost:5432/foreign_trade_test"

test_engine = create_async_engine(TEST_DATABASE_URL, echo=False)
TestAsyncSessionLocal = sessionmaker(
    test_engine,
    class_=AsyncSession,
    expire_on_commit=False,
)


@pytest.fixture(scope="session")
def event_loop():
    loop = asyncio.get_event_loop_policy().new_event_loop()
    yield loop
    loop.close()


@pytest.fixture(scope="function")
async def db_session() -> AsyncGenerator[AsyncSession, None]:
    async with test_engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)

    async with TestAsyncSessionLocal() as session:
        yield session

    async with test_engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)


@pytest.fixture(scope="function")
async def client(db_session: AsyncSession) -> AsyncGenerator[AsyncClient, None]:
    async def override_get_db():
        yield db_session

    app.dependency_overrides[get_db] = override_get_db

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

    app.dependency_overrides.clear()


@pytest.fixture
async def test_user(db_session: AsyncSession) -> User:
    user = User(
        phone="13800138000",
        username="test_user",
        password_hash=hash_password("test123456"),
        tier="free",
    )
    db_session.add(user)
    await db_session.commit()
    await db_session.refresh(user)
    return user


@pytest.fixture
async def auth_headers(test_user: User) -> dict:
    from app.core.security import create_access_token
    token = create_access_token({"sub": str(test_user.id), "tier": test_user.tier})
    return {"Authorization": f"Bearer {token}"}