"""Tests for mytoolkit.templates_registry (external root override + fallback)."""

import click
import pytest

from mytoolkit import templates_registry as tr


@pytest.fixture(autouse=True)
def clean_registry(tmp_path, monkeypatch):
    """Point the registry config file at a temp location for every test."""
    monkeypatch.setattr(tr, "CONFIG_PATH", tmp_path / "templates.json")
    yield


def test_default_root_is_bundled_package():
    root = tr.get_root()
    assert (root / "md-to-pdf").is_dir()
    assert (root / "md-to-docx").is_dir()


def test_set_root_overrides(tmp_path):
    ext = tmp_path / "ext-templates"
    (ext / "md-to-pdf").mkdir(parents=True)
    (ext / "md-to-docx").mkdir()
    assert tr.set_root(ext) == ext.resolve()
    assert tr.get_root() == ext.resolve()
    assert tr.get_md_to_pdf_root() == ext.resolve() / "md-to-pdf"
    assert tr.get_md_to_docx_root() == ext.resolve() / "md-to-docx"


def test_invalid_registered_dir_falls_back_to_bundled(tmp_path):
    tr.set_root(tmp_path / "does-not-exist")
    root = tr.get_root()
    assert (root / "md-to-pdf").is_dir()
    assert root != tmp_path / "does-not-exist"


def test_missing_subdir_raises_usage_error(tmp_path):
    ext = tmp_path / "ext-templates"
    ext.mkdir()  # no md-to-pdf inside
    tr.set_root(ext)
    with pytest.raises(click.UsageError):
        tr.get_md_to_pdf_root()