"""Smoke tests. Torch-backed checks skip when torch is not installed."""

from __future__ import annotations

import importlib.util
import json
import os

import pytest

ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
HAS_TORCH = importlib.util.find_spec("torch") is not None


def test_tts_json_structure_and_compressed_channels():
    path = os.path.join(ROOT, "tts.json")
    with open(path, encoding="utf-8") as f:
        data = json.load(f)
    ttl = data["ttl"]
    assert ttl["latent_dim"] == 24
    assert ttl["chunk_compress_factor"] == 6
    assert ttl["latent_dim"] * ttl["chunk_compress_factor"] == 144


@pytest.mark.skipif(not HAS_TORCH, reason="torch not installed")
def test_compress_decompress_roundtrip():
    import torch

    from models.utils import compress_latents, decompress_latents

    z = torch.randn(1, 24, 12)
    f = 6
    c = compress_latents(z, factor=f)
    assert c.shape[1] == 24 * f
    back = decompress_latents(c, factor=f, target_channels=24)
    assert back.shape == z.shape


@pytest.mark.skipif(not HAS_TORCH, reason="torch not installed")
def test_load_ttl_config_matches_repo():
    from models.utils import load_ttl_config

    cfg = load_ttl_config(os.path.join(ROOT, "tts.json"))
    assert cfg["chunk_compress_factor"] == 6
    assert cfg["latent_dim"] == 24
    assert cfg["compressed_channels"] == 24 * 6


@pytest.mark.skipif(not HAS_TORCH, reason="torch not installed")
def test_dp_network_latent_channels_forwarded():
    from models.dp_network import DPNetwork

    net = DPNetwork(vocab_size=100, latent_channels=128)
    assert net.ref_encoder.input_proj.in_channels == 128