"""Tests for configuration loading and validation."""

from __future__ import annotations

from pathlib import Path

import pytest

from video_vec2wav2_tokenizer.utils.config import Config, load_config


def test_defaults_load() -> None:
    cfg = load_config()
    assert cfg.sample_rate == 16000
    assert cfg.channels == 1
    assert cfg.audio_dir == Path(cfg.output_dir) / "audio"


def test_overrides_take_priority() -> None:
    cfg = load_config(overrides={"sample_rate": 8000, "device": "cpu"})
    assert cfg.sample_rate == 8000
    assert cfg.device == "cpu"


def test_none_overrides_are_ignored() -> None:
    cfg = load_config(overrides={"device": None})
    assert cfg.device == "auto"  # default preserved


def test_user_file_overrides_default(tmp_path: Path) -> None:
    p = tmp_path / "c.yaml"
    p.write_text("whisper_model: tiny\nsample_rate: 22050\n", encoding="utf-8")
    cfg = load_config(p)
    assert cfg.whisper_model == "tiny"
    assert cfg.sample_rate == 22050


def test_validate_rejects_bad_values() -> None:
    with pytest.raises(ValueError):
        Config(channels=3).validate()
    with pytest.raises(ValueError):
        Config(max_segment_length=0.5, min_segment_length=1.0).validate()


def test_missing_file_raises() -> None:
    with pytest.raises(FileNotFoundError):
        load_config("does-not-exist.yaml")


def test_derived_paths() -> None:
    cfg = Config(output_dir="out")
    assert cfg.metadata_csv == Path("out/metadata.csv")
    assert cfg.dataset_jsonl == Path("out/dataset.jsonl")
    assert cfg.tts_metadata_csv == Path("out/tts_metadata.csv")
    assert cfg.report_json == Path("out/report.json")