from uuid import uuid4

import pytest
from fastapi.testclient import TestClient


@pytest.fixture
def client(api_client: TestClient) -> TestClient:
    return api_client


def _create_scenario(client: TestClient) -> int:
    payload = {
        "name": f"Production Scenario {uuid4()}",
        "description": "Scenario for production tests",
    }
    response = client.post("/api/scenarios/", json=payload)
    assert response.status_code == 200
    return response.json()["id"]


def test_create_production_record(client: TestClient) -> None:
    scenario_id = _create_scenario(client)
    payload: dict[str, any] = {
        "scenario_id": scenario_id,
        "amount": 475.25,
        "description": "Daily output",
        "unit_name": "Tonnes",
        "unit_symbol": "t",
    }

    response = client.post("/api/production/", json=payload)
    assert response.status_code == 201
    created = response.json()
    assert created["scenario_id"] == scenario_id
    assert created["amount"] == pytest.approx(475.25)
    assert created["description"] == "Daily output"
    assert created["unit_symbol"] == "t"


def test_list_production_filters_by_scenario(client: TestClient) -> None:
    target_scenario = _create_scenario(client)
    other_scenario = _create_scenario(client)

    for scenario_id, amount in [(target_scenario, 100.0), (target_scenario, 150.0), (other_scenario, 200.0)]:
        response = client.post(
            "/api/production/",
            json={
                "scenario_id": scenario_id,
                "amount": amount,
                "description": f"Output {amount}",
                "unit_name": "Kilograms",
                "unit_symbol": "kg",
            },
        )
        assert response.status_code == 201

    list_response = client.get("/api/production/")
    assert list_response.status_code == 200
    items = [item for item in list_response.json()
             if item["scenario_id"] == target_scenario]
    assert {item["amount"] for item in items} == {100.0, 150.0}


def test_create_production_rejects_negative_amount(client: TestClient) -> None:
    scenario_id = _create_scenario(client)
    response = client.post(
        "/api/production/",
        json={
            "scenario_id": scenario_id,
            "amount": -5,
            "description": "Invalid output",
        },
    )
    assert response.status_code == 422