import os
from contextlib import ExitStack as DoesNotRaise
from pathlib import Path

import pytest

from supervision.utils.file import list_files_with_extensions, read_txt_file

FILE_1_CONTENT = """Line 1
Line 2
Line 3
"""

FILE_2_CONTENT = """   \nLine 2

Line 4

"""

FILE_3_CONTENT = """
Line 2

Line 4

"""


@pytest.fixture(scope="module", autouse=True)
def setup_and_teardown_files():
    with open("file_1.txt", "w") as file:
        file.write(FILE_1_CONTENT)
    with open("file_2.txt", "w") as file:
        file.write(FILE_2_CONTENT)
    with open("file_3.txt", "w") as file:
        file.write(FILE_3_CONTENT)

    yield

    os.remove("file_1.txt")
    os.remove("file_2.txt")
    os.remove("file_3.txt")


@pytest.mark.parametrize(
    ("file_name", "skip_empty", "expected_result", "exception"),
    [
        ("file_1.txt", False, ["Line 1", "Line 2", "Line 3"], DoesNotRaise()),
        ("file_2.txt", True, ["Line 2", "Line 4"], DoesNotRaise()),
        ("file_2.txt", False, ["   ", "Line 2", "", "Line 4", ""], DoesNotRaise()),
        ("file_3.txt", True, ["Line 2", "Line 4"], DoesNotRaise()),
        ("file_3.txt", False, ["", "Line 2", "", "Line 4", ""], DoesNotRaise()),
        (
            "file_4.txt",
            True,
            None,
            pytest.raises(FileNotFoundError, match=r"file_4\.txt"),
        ),
    ],
)
def test_read_txt_file(
    file_name: str,
    skip_empty: bool,
    expected_result: list[str] | None,
    exception: Exception,
) -> None:
    with exception:
        result = read_txt_file(file_name, skip_empty)
        assert result == expected_result


@pytest.mark.parametrize(
    ("filenames_to_create", "extension", "expected_names"),
    [
        (["image.jpg", "image.png"], ".jpg", {"image.jpg"}),
        (["image.JPG"], "jpg", {"image.JPG"}),
        (["archive.tar.gz"], "tar.gz", {"archive.tar.gz"}),
        (
            ["archive.backup.tar.gz", "archive.backup.gz"],
            "tar.gz",
            {"archive.backup.tar.gz"},
        ),
        (["archive.tar.gz", "data.gz"], "gz", {"archive.tar.gz", "data.gz"}),
    ],
    ids=[
        "leading_dot",
        "case_insensitive",
        "multi_part_full",
        "multi_part_filename_tail",
        "multi_part_suffix",
    ],
)
def test_list_files_with_extensions_normalization(
    tmp_path: Path,
    filenames_to_create: list[str],
    extension: str,
    expected_names: set[str],
) -> None:
    """Extension matching normalizes leading dots, case, and multi-part extensions."""
    for filename in filenames_to_create:
        (tmp_path / filename).touch()

    result = list_files_with_extensions(directory=tmp_path, extensions=[extension])

    assert {p.name for p in result} == expected_names