import pytest
from utils import *

server: ServerProcess

@pytest.fixture(autouse=True)
def create_server():
    global server
    server = ServerPreset.router()


@pytest.mark.parametrize(
    "model,success",
    [
        ("ggml-org/tinygemma3-GGUF:Q8_0", True),
        ("non-existent/model", False),
    ]
)
def test_router_chat_completion_stream(model: str, success: bool):
    # TODO: make sure the model is in cache (ie. ServerProcess.load_all()) before starting the router server
    global server
    server.start()
    content = ""
    ex: ServerError | None = None
    try:
        res = server.make_stream_request("POST", "/chat/completions", data={
            "model": model,
            "max_tokens": 16,
            "messages": [
                {"role": "user", "content": "hello"},
            ],
            "stream": True,
        })
        for data in res:
            if data["choices"]:
                choice = data["choices"][0]
                if choice["finish_reason"] in ["stop", "length"]:
                    assert "content" not in choice["delta"]
                else:
                    assert choice["finish_reason"] is None
                    content += choice["delta"]["content"] or ''
    except ServerError as e:
        ex = e

    if success:
        assert ex is None
        assert len(content) > 0
    else:
        assert ex is not None
        assert content == ""