from fastapi import FastAPI, HTTPException
from fastapi.testclient import TestClient

from app.api.problem_details import install_problem_details_handlers


def test_structured_http_error_preserves_domain_code_and_recovery_fields():
    app = FastAPI()
    install_problem_details_handlers(app)

    @app.get("/lease")
    async def expired_lease():
        raise HTTPException(
            status_code=409,
            detail={
                "code": "LEASE_EXPIRED",
                "message": "Agent lease has expired",
                "retryable": False,
                "related_refs": ["task-1"],
                "recovery_action": "claim_new_generation",
                "retry_after_seconds": None,
            },
        )

    response = TestClient(app).get("/lease")

    assert response.status_code == 409
    assert response.headers["content-type"].startswith("application/problem+json")
    assert response.json() == {
        "type": "https://tjwater.example/problems/LEASE-EXPIRED",
        "title": "Conflict",
        "status": 409,
        "detail": "Agent lease has expired",
        "instance": "/lease",
        "code": "LEASE_EXPIRED",
        "trace_id": response.json()["trace_id"],
        "errors": [],
        "retryable": False,
        "related_refs": ["task-1"],
        "recovery_action": "claim_new_generation",
        "retry_after_seconds": None,
    }