import pytest
from fastapi.testclient import TestClient
from sqlmodel import Session, SQLModel, create_engine
from sqlmodel.pool import StaticPool

from app.main import app
from app.core.db import get_session
from app.schemas.models import User, Partner, Product, Transaction
from app.schemas.base import UserRole, PartnerType, TransactionType, TransactionStatus
from app.core.auth import get_password_hash


@pytest.fixture(name="session")
def session_fixture():
    """Create a test database session."""
    engine = create_engine(
        "sqlite:///:memory:",  # Use in-memory database for each test
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )
    SQLModel.metadata.create_all(engine)
    with Session(engine) as session:
        yield session


@pytest.fixture(name="client")
def client_fixture(session: Session):
    """Create a test client with dependency override."""
    def get_session_override():
        return session

    app.dependency_overrides[get_session] = get_session_override
    client = TestClient(app)
    yield client
    app.dependency_overrides.clear()


@pytest.fixture(name="admin_user")
def admin_user_fixture(session: Session):
    """Create an admin user for testing."""
    admin_user = User(
        username="testadmin",
        password_hash=get_password_hash("adminpassword"),
        role=UserRole.ADMIN
    )
    session.add(admin_user)
    session.commit()
    session.refresh(admin_user)
    return admin_user


@pytest.fixture(name="write_user")
def write_user_fixture(session: Session):
    """Create a write user for testing."""
    write_user = User(
        username="writeuser",
        password_hash=get_password_hash("writepassword"),
        role=UserRole.WRITE
    )
    session.add(write_user)
    session.commit()
    session.refresh(write_user)
    return write_user


@pytest.fixture(name="read_only_user")
def read_only_user_fixture(session: Session):
    """Create a read-only user for testing."""
    read_only_user = User(
        username="readuser",
        password_hash=get_password_hash("readpassword"),
        role=UserRole.READ_ONLY
    )
    session.add(read_only_user)
    session.commit()
    session.refresh(read_only_user)
    return read_only_user


@pytest.fixture(name="admin_token")
def admin_token_fixture(client: TestClient, admin_user: User):
    """Get admin authentication token."""
    response = client.post("/api/v1/users/login", json={
        "username": "testadmin",
        "password": "adminpassword"
    })
    return response.json()["access_token"]


@pytest.fixture(name="write_token")
def write_token_fixture(client: TestClient, write_user: User):
    """Get write user authentication token."""
    response = client.post("/api/v1/users/login", json={
        "username": "writeuser",
        "password": "writepassword"
    })
    return response.json()["access_token"]


@pytest.fixture(name="read_only_token")
def read_only_token_fixture(client: TestClient, read_only_user: User):
    """Get read-only user authentication token."""
    response = client.post("/api/v1/users/login", json={
        "username": "readuser",
        "password": "readpassword"
    })
    return response.json()["access_token"]


@pytest.fixture(name="sample_partner")
def sample_partner_fixture(session: Session):
    """Create a sample partner for testing."""
    partner = Partner(
        tin_number=123456789,
        names="Test Partner Ltd",
        type=PartnerType.CLIENT,
        phone_number="0123456789"
    )
    session.add(partner)
    session.commit()
    session.refresh(partner)
    return partner


@pytest.fixture(name="sample_product")
def sample_product_fixture(session: Session):
    """Create a sample product for testing."""
    product = Product(
        product_code="PROD001",
        product_name="Test Product",
        purchase_price=100,
        selling_price=150
    )
    session.add(product)
    session.commit()
    session.refresh(product)
    return product


@pytest.fixture(name="sample_transaction")
def sample_transaction_fixture(session: Session, sample_partner, admin_user):
    """Create a sample transaction for testing."""
    transaction = Transaction(
        partner_id=sample_partner.id,
        transcation_type=TransactionType.SALE,
        transaction_status=TransactionStatus.UNPAID,
        total_amount=1000,
        created_by=admin_user.id,
        updated_by=admin_user.id
    )
    session.add(transaction)
    session.commit()
    session.refresh(transaction)
    return transaction


@pytest.fixture(name="multiple_partners")
def multiple_partners_fixture(session: Session):
    """Create multiple partners for testing."""
    partners = [
        Partner(
            tin_number=100000001,
            names="Client Partner One",
            type=PartnerType.CLIENT,
            phone_number="0111111111"
        ),
        Partner(
            tin_number=200000002,
            names="Supplier Partner Two",
            type=PartnerType.SUPPLIER,
            phone_number="0222222222"
        ),
        Partner(
            tin_number=300000003,
            names="Client Partner Three",
            type=PartnerType.CLIENT,
            phone_number="0333333333"
        )
    ]
    for partner in partners:
        session.add(partner)
    session.commit()
    for partner in partners:
        session.refresh(partner)
    return partners


@pytest.fixture(name="multiple_products")
def multiple_products_fixture(session: Session):
    """Create multiple products for testing."""
    products = [
        Product(
            product_code="ITEM001",
            product_name="Product One",
            purchase_price=50,
            selling_price=75
        ),
        Product(
            product_code="ITEM002",
            product_name="Product Two",
            purchase_price=200,
            selling_price=250
        ),
        Product(
            product_code="ITEM003",
            product_name="Product Three",
            purchase_price=1000,
            selling_price=1200
        )
    ]
    for product in products:
        session.add(product)
    session.commit()
    for product in products:
        session.refresh(product)
    return products