"""Tests for live engine-configuration reporting.

These settings live outside this codebase but dictate how arbitration must behave, and
working out why a yield behaved a certain way once meant reading journald by hand. The
dashboard previously asserted them as hardcoded text, which happened to be accurate --
worse than being wrong, because it would have stayed accurate-looking after the settings
changed.
"""
import asyncio

import pytest

import engines


class _Proc:
    def __init__(self, stdout=""):
        self.stdout = stdout
        self.returncode = 0


class TestOllamaEnvironmentParsing:
    def test_parses_the_real_unit_environment(self, monkeypatch):
        # Verbatim from `systemctl show ollama -p Environment --value` on this machine.
        raw = ("OLLAMA_HOST=0.0.0.0:11434 OLLAMA_FLASH_ATTENTION=1 "
               "OLLAMA_KV_CACHE_TYPE=q4_0 OLLAMA_KEEP_ALIVE=30m "
               "OLLAMA_MAX_LOADED_MODELS=1 OLLAMA_NUM_PARALLEL=1 OLLAMA_NUM_BATCH=2048")
        monkeypatch.setattr(engines.subprocess, "run", lambda *a, **k: _Proc(raw))
        env = engines._ollama_unit_environment()
        assert env["OLLAMA_NUM_PARALLEL"] == "1"
        assert env["OLLAMA_MAX_LOADED_MODELS"] == "1"
        assert env["OLLAMA_KV_CACHE_TYPE"] == "q4_0"

    def test_ignores_non_ollama_variables(self, monkeypatch):
        monkeypatch.setattr(engines.subprocess, "run",
                            lambda *a, **k: _Proc("PATH=/usr/bin OLLAMA_HOST=x:1 HOME=/root"))
        env = engines._ollama_unit_environment()
        assert set(env) == {"OLLAMA_HOST"}

    def test_returns_empty_rather_than_raising_when_systemctl_fails(self, monkeypatch):
        def boom(*a, **k):
            raise FileNotFoundError("systemctl")
        monkeypatch.setattr(engines.subprocess, "run", boom)
        assert engines._ollama_unit_environment() == {}


class TestEngineConfigReport:
    def _run(self, monkeypatch, env, comfy_ok=True):
        monkeypatch.setattr(engines, "_ollama_unit_environment", lambda: env)

        class _Resp:
            status_code = 200 if comfy_ok else 500
            def json(self):
                return {"system": {"comfyui_version": "0.33.1",
                                   "pytorch_version": "2.11.0+cu128",
                                   "python_version": "3.14.4 (main)",
                                   "argv": ["main.py", "--listen", "0.0.0.0"]},
                        "devices": [{"name": "cuda:0 NVIDIA GeForce RTX 4080 SUPER "
                                             ": cudaMallocAsync"}]}

        class _Client:
            async def __aenter__(self): return self
            async def __aexit__(self, *a): return False
            async def get(self, url): return _Resp()

        monkeypatch.setattr(engines.httpx, "AsyncClient", lambda **k: _Client())
        return asyncio.run(engines.get_engine_config())

    def test_surfaces_the_settings_that_drive_arbitration(self, monkeypatch):
        d = self._run(monkeypatch, {"OLLAMA_NUM_PARALLEL": "1",
                                    "OLLAMA_MAX_LOADED_MODELS": "1",
                                    "OLLAMA_KEEP_ALIVE": "30m"})
        assert d["ollama"]["num_parallel"] == "1"
        assert d["ollama"]["max_loaded_models"] == "1"
        assert d["ollama"]["keep_alive"] == "30m"

    def test_num_parallel_explains_the_deferred_yield_behaviour(self, monkeypatch):
        d = self._run(monkeypatch, {"OLLAMA_NUM_PARALLEL": "1"})
        note = next(s["means"] for s in d["ollama"]["settings"]
                    if s["key"] == "OLLAMA_NUM_PARALLEL")
        # The explanation is the point: it is why a busy model is deferred, not failed.
        assert "queue" in note.lower()

    def test_summary_reflects_actual_flags_not_a_fixed_string(self, monkeypatch):
        on = self._run(monkeypatch, {"OLLAMA_FLASH_ATTENTION": "1",
                                     "OLLAMA_KV_CACHE_TYPE": "q4_0"})
        assert "FlashAttention" in on["ollama"]["summary"]
        assert "q4_0" in on["ollama"]["summary"]
        off = self._run(monkeypatch, {})
        assert "FlashAttention" not in off["ollama"]["summary"]
        assert off["ollama"]["config_source"] == "unavailable"

    def test_port_comes_from_ollama_host(self, monkeypatch):
        d = self._run(monkeypatch, {"OLLAMA_HOST": "0.0.0.0:11500"})
        assert d["ollama"]["port"] == "11500"

    def test_comfy_allocator_and_vram_mode_are_read_not_asserted(self, monkeypatch):
        d = self._run(monkeypatch, {})
        assert d["comfyui"]["allocator"] == "cudaMallocAsync"
        assert d["comfyui"]["vram_mode"] == "default (auto)"
        assert d["comfyui"]["version"] == "0.33.1"

    def test_comfy_vram_flag_is_detected_when_present(self, monkeypatch):
        monkeypatch.setattr(engines, "_ollama_unit_environment", lambda: {})

        class _Resp:
            status_code = 200
            def json(self):
                return {"system": {"argv": ["main.py", "--lowvram"]},
                        "devices": [{"name": "cuda:0 X : cudaMalloc"}]}

        class _Client:
            async def __aenter__(self): return self
            async def __aexit__(self, *a): return False
            async def get(self, url): return _Resp()

        monkeypatch.setattr(engines.httpx, "AsyncClient", lambda **k: _Client())
        d = asyncio.run(engines.get_engine_config())
        assert d["comfyui"]["vram_mode"] == "--lowvram"
        assert d["comfyui"]["allocator"] == "cudaMalloc"

    def test_offline_comfy_is_reported_not_raised(self, monkeypatch):
        monkeypatch.setattr(engines, "_ollama_unit_environment", lambda: {})

        class _Client:
            async def __aenter__(self): return self
            async def __aexit__(self, *a): return False
            async def get(self, url): raise ConnectionError("refused")

        monkeypatch.setattr(engines.httpx, "AsyncClient", lambda **k: _Client())
        d = asyncio.run(engines.get_engine_config())
        assert d["comfyui"]["online"] is False
        assert "error" in d["comfyui"]