"""GPU-Erkennung/-Maske und das daraus abgeleitete TTS-Menü in /api/config (offline)."""

import asyncio
import os

from fastapi.testclient import TestClient

import app.capabilities as cap
import app.api.config as cfgmod
from app.config import settings, _parse_gpu_indices, _apply_gpu_visibility
from app.main import app

client = TestClient(app)


def _gpus(*indices):
    async def fake():
        return [
            {"index": i, "name": f"GPU{i}", "used_mib": 0, "total_mib": 1, "percent": 0}
            for i in indices
        ]
    return fake


# ── Maske/Parsing ────────────────────────────────────────────────────────────

def test_parse_gpu_indices():
    assert _parse_gpu_indices("0, 2 ,1") == [0, 1, 2]
    assert _parse_gpu_indices("") == []
    assert _parse_gpu_indices("auto") == []


def test_apply_gpu_visibility_none(monkeypatch):
    monkeypatch.setattr(settings, "gpus", "none")
    monkeypatch.delenv("CUDA_VISIBLE_DEVICES", raising=False)
    _apply_gpu_visibility()
    assert os.environ["CUDA_VISIBLE_DEVICES"] == ""


def test_apply_gpu_visibility_explicit_sets_cuda(monkeypatch):
    monkeypatch.setattr(settings, "gpus", "2,0")
    monkeypatch.delenv("CUDA_VISIBLE_DEVICES", raising=False)
    _apply_gpu_visibility()
    assert os.environ["CUDA_VISIBLE_DEVICES"] == "0,2"


def test_apply_gpu_visibility_auto_keeps_existing(monkeypatch):
    monkeypatch.setattr(settings, "gpus", "auto")
    monkeypatch.setenv("CUDA_VISIBLE_DEVICES", "1")
    _apply_gpu_visibility()
    assert os.environ["CUDA_VISIBLE_DEVICES"] == "1"  # unveraendert


# ── resolve_gpus ─────────────────────────────────────────────────────────────

def test_resolve_gpus_none(monkeypatch):
    monkeypatch.setattr(settings, "gpus", "none")
    assert asyncio.run(cap.resolve_gpus()) == []


def test_resolve_gpus_auto_all(monkeypatch):
    monkeypatch.setattr(settings, "gpus", "auto")
    monkeypatch.delenv("CUDA_VISIBLE_DEVICES", raising=False)
    monkeypatch.setattr(cap, "detect_physical_gpus", _gpus(0, 1))
    assert [g["index"] for g in asyncio.run(cap.resolve_gpus())] == [0, 1]


def test_resolve_gpus_explicit_subset(monkeypatch):
    monkeypatch.setattr(settings, "gpus", "0,2")
    monkeypatch.delenv("CUDA_VISIBLE_DEVICES", raising=False)
    monkeypatch.setattr(cap, "detect_physical_gpus", _gpus(0, 1, 2))
    assert [g["index"] for g in asyncio.run(cap.resolve_gpus())] == [0, 2]


def test_resolve_gpus_intersects_cuda_mask(monkeypatch):
    monkeypatch.setattr(settings, "gpus", "auto")
    monkeypatch.setenv("CUDA_VISIBLE_DEVICES", "1")
    monkeypatch.setattr(cap, "detect_physical_gpus", _gpus(0, 1))
    assert [g["index"] for g in asyncio.run(cap.resolve_gpus())] == [1]


# ── /api/config: Menü-Sichtbarkeit + gpus ────────────────────────────────────

def _patch_probes(monkeypatch, *, chatterbox, openrouter, cartesia, gpus):
    async def _t():
        return True
    async def _f():
        return False
    async def _gpu():
        return [{"index": i, "name": f"GPU{i}"} for i in gpus]
    monkeypatch.setattr(cfgmod, "_chatterbox_reachable", _t if chatterbox else _f)
    monkeypatch.setattr(cfgmod, "_openrouter_tts_available", _t if openrouter else _f)
    monkeypatch.setattr(cfgmod, "_cartesia_available", _t if cartesia else _f)
    monkeypatch.setattr(cfgmod, "resolve_gpus", _gpu)
    monkeypatch.setattr(cfgmod, "_CACHE", None)  # Cache je Test zuruecksetzen
    monkeypatch.setattr(cfgmod, "_CACHE_TS", 0.0)


def test_config_tts_menu_hides_unavailable(monkeypatch):
    _patch_probes(monkeypatch, chatterbox=False, openrouter=False, cartesia=True, gpus=[])
    data = client.get("/api/config").json()
    menu = {m["provider"]: m for m in data["tts_menu"]}
    assert menu["piper"]["visible"] is True          # garantierter Default
    assert menu["chatterbox"]["visible"] is False    # nicht erreichbar -> aus
    assert menu["openrouter"]["visible"] is False    # kein TTS-Modell -> aus
    assert menu["cartesia"]["visible"] is True
    assert menu["device"]["client_only"] is True     # Mobil-Regel macht das Frontend
    assert data["available"]["gpus"] == []


def test_config_reports_gpus(monkeypatch):
    _patch_probes(monkeypatch, chatterbox=True, openrouter=True, cartesia=True, gpus=[0, 1])
    data = client.get("/api/config").json()
    assert [g["index"] for g in data["available"]["gpus"]] == [0, 1]
    assert {m["provider"] for m in data["tts_menu"]} == {
        "piper", "chatterbox", "cartesia", "openrouter", "device"
    }