data-entry-app/backend/tests/test_costing_engine.py

from datetime import date

from fastapi.testclient import TestClient
from sqlalchemy import create_engine, inspect, text
from sqlalchemy.orm import Session, sessionmaker
from sqlalchemy.pool import StaticPool

from app.core.config import settings
from app.db.migrations import bootstrap_schema, sync_tenant_ids
from app.db.session import Base
from app.main import app
from app.models.assumption import FreightCostRule, PackagingCostRule, ProcessCostRule
from app.models.client_access import ClientAccount, ClientFeatureAccess, ClientUser
from app.models.mix import Mix, MixIngredient
from app.models.product import Product
from app.models.raw_material import RawMaterial, RawMaterialPriceVersion
from app.services.client_access_service import build_client_access_export, serialize_client_account
from app.services.costing_engine import calculate_mix_cost, calculate_product_cost, calculate_raw_material_cost


def build_session() -> Session:
    engine = create_engine("sqlite:///:memory:")
    Base.metadata.create_all(bind=engine)
    session = sessionmaker(bind=engine, expire_on_commit=False)()
    return session


def test_calculate_raw_material_cost():
    raw_material = RawMaterial(name="Maize", unit_of_measure="tonne", kg_per_unit=1000, status="active")
    price = RawMaterialPriceVersion(market_value=500, waste_percentage=0.02, effective_date=date(2026, 4, 1))

    result = calculate_raw_material_cost(raw_material, price)

    assert result.loss_cost == 10.0
    assert result.cost_per_unit == 510.0
    assert result.cost_per_kg == 0.51


def test_mix_and_product_cost_breakdown():
    db = build_session()

    maize = RawMaterial(name="Maize", unit_of_measure="tonne", kg_per_unit=1000, status="active")
    maize.price_versions.append(RawMaterialPriceVersion(market_value=520, waste_percentage=0.02, effective_date=date(2026, 4, 1)))
    barley = RawMaterial(name="Barley", unit_of_measure="tonne", kg_per_unit=1000, status="active")
    barley.price_versions.append(RawMaterialPriceVersion(market_value=470, waste_percentage=0.015, effective_date=date(2026, 4, 1)))
    db.add_all([maize, barley])
    db.flush()

    mix = Mix(client_name="Specialty Feeds", name="Pigeon Mix", status="active", version=1)
    db.add(mix)
    db.flush()
    db.add_all(
        [
            MixIngredient(mix_id=mix.id, raw_material_id=maize.id, quantity_kg=180),
            MixIngredient(mix_id=mix.id, raw_material_id=barley.id, quantity_kg=100),
        ]
    )
    db.add(ProcessCostRule(process_name="standard_bagging", grading_cost=0.055, bagging_cost=0.04, cracking_cost=0.0))
    db.add(PackagingCostRule(sale_type="standard", unit_of_measure="20kg bag", own_bag=False, bag_cost=0.63))
    db.add(FreightCostRule(sale_type="standard", unit_of_measure="20kg bag", cost_per_unit=1.45))
    db.flush()
    product = Product(
        client_name="Specialty Feeds",
        name="Specialty Pigeon Breeder 20kg",
        mix_id=mix.id,
        sale_type="standard",
        own_bag=False,
        unit_of_measure="20kg bag",
        items_per_pallet=50,
        bagging_process="standard_bagging",
        distributor_margin=0.225,
        wholesale_margin=0.18,
    )
    db.add(product)
    db.commit()

    mix_result = calculate_mix_cost(db, mix.id)
    product_result = calculate_product_cost(db, product.id)

    assert mix_result["total_mix_kg"] == 280
    assert mix_result["mix_cost_per_kg"] == 0.5114
    assert product_result["client_name"] == "Specialty Feeds"
    assert product_result["mix_name"] == "Pigeon Mix"
    assert product_result["finished_product_delivered"] == 14.208
    assert product_result["distributor_price"] == 18.3329
    assert product_result["wholesale_price"] == 17.3268


def test_root_and_login_endpoints():
    client = TestClient(app)

    root_response = client.get("/")
    assert root_response.status_code == 200
    assert root_response.json()["endpoints"]["client_login"] == "/api/auth/client/login"
    assert root_response.json()["endpoints"]["admin_login"] == "/api/auth/admin/login"

    client_login_response = client.post(
        "/api/auth/client/login",
        json={"email": settings.client_email, "password": settings.client_password},
    )
    assert client_login_response.status_code == 200
    assert client_login_response.json()["email"] == settings.client_email
    assert client_login_response.json()["tenant_id"] == settings.client_tenant_id

    admin_login_response = client.post(
        "/api/auth/admin/login",
        json={"email": settings.admin_email, "password": settings.admin_password},
    )
    assert admin_login_response.status_code == 200
    assert admin_login_response.json()["email"] == settings.admin_email


def test_client_access_export_helpers():
    db = build_session()

    client = ClientAccount(
        tenant_id="specialty-feeds",
        name="Specialty Feeds",
        client_code="SPEC",
        status="active",
        powerbi_workspace="farm-ops-prod",
    )
    client.users.extend(
        [
            ClientUser(
                full_name="Amelia Hart",
                email="amelia.hart@specialtyfeeds.example",
                role="admin",
                status="active",
                is_new_user=False,
            ),
            ClientUser(
                full_name="Ethan Cole",
                email="ethan.cole@specialtyfeeds.example",
                role="operator",
                status="invited",
                is_new_user=True,
            ),
        ]
    )
    client.features.extend(
        [
            ClientFeatureAccess(
                feature_key="dashboard",
                feature_name="Dashboard",
                feature_group="workspace",
                enabled=True,
            ),
            ClientFeatureAccess(
                feature_key="products",
                feature_name="Products",
                feature_group="pricing",
                enabled=False,
            ),
        ]
    )
    db.add(client)
    db.commit()
    db.refresh(client)

    serialized = serialize_client_account(client)
    export = build_client_access_export([client])

    assert serialized["active_user_count"] == 1
    assert serialized["new_user_count"] == 1
    assert serialized["enabled_feature_count"] == 1
    assert export["client_rows"][0]["client_code"] == "SPEC"
    assert export["user_rows"][0]["client_name"] == "Specialty Feeds"
    assert len(export["feature_rows"]) == 2


def test_client_access_endpoints():
    with TestClient(app) as client:
        login_response = client.post(
            "/api/auth/admin/login",
            json={"email": settings.admin_email, "password": settings.admin_password},
        )
        token = login_response.json()["token"]
        headers = {"Authorization": f"Bearer {token}"}

        access_response = client.get("/api/client-access", headers=headers)
        assert access_response.status_code == 200
        assert len(access_response.json()) >= 1

        export_response = client.get("/api/powerbi/client-access", headers=headers)
        assert export_response.status_code == 200
        assert "client_rows" in export_response.json()


def test_bootstrap_schema_creates_missing_tables_and_patches_legacy_tenant_columns():
    engine = create_engine(
        "sqlite://",
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )

    with engine.begin() as connection:
        connection.execute(
            text(
                """
                CREATE TABLE client_accounts (
                    id INTEGER PRIMARY KEY,
                    tenant_id VARCHAR(64),
                    name VARCHAR(255),
                    client_code VARCHAR(64),
                    status VARCHAR(32),
                    powerbi_workspace VARCHAR(128),
                    notes TEXT,
                    created_at DATETIME
                )
                """
            )
        )
        connection.execute(
            text(
                """
                CREATE TABLE raw_materials (
                    id INTEGER PRIMARY KEY,
                    name VARCHAR(255),
                    supplier VARCHAR(255),
                    unit_of_measure VARCHAR(64),
                    kg_per_unit FLOAT,
                    status VARCHAR(32),
                    notes TEXT,
                    created_at DATETIME
                )
                """
            )
        )
        connection.execute(
            text(
                """
                INSERT INTO client_accounts (id, tenant_id, name, client_code, status)
                VALUES (1, 'specialty-feeds', 'Specialty Feeds', 'SPEC', 'active')
                """
            )
        )
        connection.execute(
            text(
                """
                INSERT INTO raw_materials (id, name, supplier, unit_of_measure, kg_per_unit, status)
                VALUES (1, 'Maize', 'Example Supplier', 'tonne', 1000, 'active')
                """
            )
        )

    report = bootstrap_schema(engine, Base.metadata)
    synced_rows = sync_tenant_ids(engine)

    assert "products" in report.created_tables
    assert "raw_materials.tenant_id" in report.added_columns
    assert "tenant_id" in {column["name"] for column in inspect(engine).get_columns("raw_materials")}
    assert synced_rows["raw_materials"] == 1

    with engine.begin() as connection:
        tenant_id = connection.execute(text("SELECT tenant_id FROM raw_materials WHERE id = 1")).scalar_one()

    assert tenant_id == "specialty-feeds"