"""#101: POST /api/vision/dxf-preview, anteprima del DXF nel wizard.

Il worker non gira nei test: `vision_service.dxf_preview` si sostituisce.
"""
import pytest
from fastapi import HTTPException

from src.backend.config import settings
from src.backend.services import vision_service
from src.backend.tests.conftest import auth_headers

BODY = {
    "contorni": [[[0.0, 0.0], [10.0, 0.0], [10.0, 5.0], [0.0, 5.0], [0.0, 0.0]]],
    "bbox": {"xmin": 0.0, "ymin": 0.0, "xmax": 10.0, "ymax": 5.0},
    "larghezza_mm": 10.0, "altezza_mm": 5.0, "entita": 1, "punti": 5,
}


def _post(client, user, content=b"0\nEOF"):
    return client.post(
        "/api/vision/dxf-preview",
        headers=auth_headers(user),
        files={"dxf": ("d.dxf", content, "application/octet-stream")},
    )


@pytest.mark.asyncio
async def test_dxf_preview_forwards_the_file_and_returns_the_worker_body(
    client, maker_user, monkeypatch,
):
    calls = []

    async def fake(dxf_bytes, worker_url=None):
        calls.append(dxf_bytes)
        return BODY

    monkeypatch.setattr("src.backend.services.vision_service.dxf_preview", fake)
    resp = await _post(client, maker_user, b"DXF-BYTES")
    assert resp.status_code == 200, resp.text
    assert resp.json() == BODY
    assert calls == [b"DXF-BYTES"]


@pytest.mark.asyncio
async def test_dxf_preview_forwards_the_worker_422(client, maker_user, monkeypatch):
    async def fake(dxf_bytes, worker_url=None):
        raise HTTPException(status_code=422, detail="DXF illeggibile: file vuoto")

    monkeypatch.setattr("src.backend.services.vision_service.dxf_preview", fake)
    resp = await _post(client, maker_user, b"")
    assert resp.status_code == 422
    assert resp.json()["detail"] == "DXF illeggibile: file vuoto"


@pytest.mark.asyncio
async def test_dxf_preview_requires_maker(client, measurement_tec_user, monkeypatch):
    async def fake(dxf_bytes, worker_url=None):
        return BODY

    monkeypatch.setattr("src.backend.services.vision_service.dxf_preview", fake)
    resp = await _post(client, measurement_tec_user)
    assert resp.status_code == 403


@pytest.mark.asyncio
async def test_dxf_preview_too_big_is_422(client, maker_user, monkeypatch):
    monkeypatch.setattr(settings, "max_upload_size_mb", 0)
    resp = await _post(client, maker_user, b"x" * 10)
    assert resp.status_code == 422


@pytest.mark.asyncio
async def test_dxf_preview_service_posts_to_worker_and_checks_shape(monkeypatch):
    seen = {}

    async def fake_multipart(path, *, files, data, worker_url=None, timeout=120.0):
        seen.update(path=path, files=files)
        return BODY

    monkeypatch.setattr(vision_service, "call_worker_multipart", fake_multipart)
    assert await vision_service.dxf_preview(b"abc") == BODY
    assert seen["path"] == "/dxf/preview" and seen["files"]["dxf"][1] == b"abc"

    async def malformed(path, *, files, data, worker_url=None, timeout=120.0):
        return {"contorni": []}

    monkeypatch.setattr(vision_service, "call_worker_multipart", malformed)
    with pytest.raises(HTTPException) as exc:
        await vision_service.dxf_preview(b"abc")
    assert exc.value.status_code == 502