"""The worker is a thin shell: it receives an image and a graph, and answers
with numbers."""
import io
import json

import pytest

# Same reasoning as src/vision/tests/test_runner.py: the vision tree (and
# therefore this worker, which imports src.vision.runner) requires Python
# >=3.13. This must run before `import numpy` / `from src.vision_worker.main
# import app` so that `uv run pytest` on the default 3.11 environment reports
# this module as skipped, with a reason, instead of erroring out of
# collection.
pytest.importorskip(
    "visionsuite.task",
    reason=(
        "the vision tree requires Python >=3.13 (vs-task/vs-measure/vs-pm2d "
        "declare it upstream); run it with "
        "`uv run --python 3.13 --extra vision --extra dev pytest "
        "src/vision_worker/tests`"
    ),
)

import numpy as np
from httpx import ASGITransport, AsyncClient
from PIL import Image

from src.vision_worker.main import app


def a_disc_png(radius: int = 60, size: int = 400) -> bytes:
    image = np.zeros((size, size), dtype=np.uint8)
    yy, xx = np.ogrid[:size, :size]
    centre = size // 2
    image[(yy - centre) ** 2 + (xx - centre) ** 2 <= radius ** 2] = 255
    buffer = io.BytesIO()
    Image.fromarray(image).save(buffer, format="PNG")
    return buffer.getvalue()


def a_circle_graph() -> dict:
    from visionsuite.task import Task
    from visionsuite.task.tools import DetectCircleTool, DiameterTool

    task = Task(name="prova")
    found = task.add(DetectCircleTool(name="disco"))
    found.center_row, found.center_col, found.radius = 200.0, 200.0, 60.0
    found.scan_size = 30.0
    quota = task.add(DiameterTool(name="diametro"))
    quota.link("circle", found, "circle")
    return task.to_dict()


@pytest.mark.asyncio
async def test_health_says_which_engine_it_carries():
    transport = ASGITransport(app=app)
    async with AsyncClient(transport=transport, base_url="http://worker") as client:
        response = await client.get("/health")

    assert response.status_code == 200
    assert len(response.json()["engine_version"]) == 40


@pytest.mark.asyncio
async def test_run_returns_the_named_outputs():
    transport = ASGITransport(app=app)
    async with AsyncClient(transport=transport, base_url="http://worker") as client:
        response = await client.post(
            "/run",
            files={"image": ("piece.png", a_disc_png(), "image/png")},
            data={"graph": json.dumps(a_circle_graph())},
        )

    assert response.status_code == 200
    body = response.json()
    assert body["failures"] == []
    assert any(key.endswith(".diameter") for key in body["outputs"])


@pytest.mark.asyncio
async def test_a_malformed_graph_is_refused_not_crashed():
    transport = ASGITransport(app=app)
    async with AsyncClient(transport=transport, base_url="http://worker") as client:
        response = await client.post(
            "/run",
            files={"image": ("piece.png", a_disc_png(), "image/png")},
            data={"graph": json.dumps({"schema_version": 99, "tools": []})},
        )

    assert response.status_code == 422
    assert "99" in response.json()["detail"]