import json
from pathlib import Path

from configure_matcha_ft import configure_matcha_ft


def test_configure_matcha_ft_and_joint_mode(tmp_path: Path) -> None:
    config_path = tmp_path / "config.json"
    config_path.write_text(
        json.dumps(
            {
                "train": {"learning_rate": 0.0002, "epochs": 100},
                "model": {"use_matcha": False},
            }
        ),
        encoding="utf-8",
    )

    configured = configure_matcha_ft(
        config_path,
        learning_rate=0.0001,
        epochs=20,
        save_every_steps=50,
    )
    assert configured["train"]["matcha_only"] is True
    assert configured["train"]["learning_rate"] == 0.0001
    assert configured["train"]["eval_interval"] == 50
    assert configured["model"]["use_matcha"] is True
    assert configured["model"]["matcha_use_diff_attention"] is True
    assert config_path.with_suffix(".json.bak").is_file()

    configured = configure_matcha_ft(config_path, matcha_only=False)
    assert configured["train"]["matcha_only"] is False