import json
from unittest.mock import patch

from import_colmap import import_colmap
from validate_capture_manifest import validate_capture_manifest


def test_import_colmap_builds_valid_world_to_camera_manifest(tmp_path):
    (tmp_path / "images").mkdir(exist_ok=True)
    (tmp_path / "images" / "one.png").write_bytes(b"one")
    (tmp_path / "images" / "two.png").write_bytes(b"two")
    cameras = tmp_path / "cameras.txt"
    cameras.write_text("# Camera list\n1 PINHOLE 640 480 500 500 320 240\n", encoding="utf-8")
    images = tmp_path / "images.txt"
    images.write_text("\n".join([
        "# Images", "1 1 0 0 0 0 0 0 1 images/one.png", "", "2 1 0 0 0 -1 0 0 1 images/two.png", "",
    ]), encoding="utf-8")
    manifest_path = tmp_path / "capture.json"
    manifest = import_colmap(cameras, images, tmp_path, {"2"})
    manifest_path.write_text(json.dumps(manifest), encoding="utf-8")
    valid, errors = validate_capture_manifest(manifest_path, check_files=True)
    assert valid is True, errors
    assert manifest["views"][1]["split"] == "held_out"
    assert len(manifest["views"][0]["sha256"]) == 64


def test_import_colmap_rejects_unknown_camera_model(tmp_path):
    cameras = tmp_path / "cameras.txt"
    cameras.write_text("1 UNKNOWN 10 10 1 2 3\n", encoding="utf-8")
    images = tmp_path / "images.txt"
    images.write_text("1 1 0 0 0 0 0 0 1 image.png\n", encoding="utf-8")
    try:
        import_colmap(cameras, images, tmp_path)
    except ValueError as exc:
        assert "unsupported COLMAP camera model" in str(exc)
    else:
        raise AssertionError("unknown camera model should fail")


def test_import_colmap_cli_requires_held_out_split():
    from import_colmap import main
    with patch("import_colmap.Path.is_file", return_value=False):
        try:
            main(["cameras.txt", "images.txt", ".", "capture.json"])
        except SystemExit as exc:
            assert exc.code == 2
        else:
            raise AssertionError("CLI should require held-out views")