"""Tests for creating a griffe Module from specific commits in a git repository."""

from __future__ import annotations

import shutil
from subprocess import run
from typing import TYPE_CHECKING

import pytest

from griffe import Module, check, load_git
from tests import FIXTURES_DIR

if TYPE_CHECKING:
    from pathlib import Path

REPO_NAME = "my-repo"
REPO_SOURCE = FIXTURES_DIR / "_repo"
MODULE_NAME = "my_module"


def _copy_contents(src: Path, dst: Path) -> None:
    """Copy *contents* of src into dst.

    Parameters:
        src: the folder whose contents will be copied to dst
        dst: the destination folder
    """
    dst.mkdir(exist_ok=True, parents=True)
    for src_path in src.iterdir():
        dst_path = dst / src_path.name
        if src_path.is_dir():
            _copy_contents(src_path, dst_path)
        else:
            shutil.copy(src_path, dst_path)


@pytest.fixture
def git_repo(tmp_path: Path) -> Path:
    """Fixture that creates a git repo with multiple tagged versions.

    For each directory in `tests/test_git/_repo/`

        - the contents of the directory will be copied into the temporary repo
        - all files will be added and commited
        - the commit will be tagged with the name of the directory

    To add to these tests (i.e. to simulate change over time), either modify one of
    the files in the existing `v0.1.0`, `v0.2.0` folders, or continue adding new
    version folders following the same pattern.

    Parameters:
        tmp_path: temporary directory fixture

    Returns:
        Path: path to temporary repo.
    """
    repo_path = tmp_path / REPO_NAME
    repo_path.mkdir()
    run(["git", "-C", str(repo_path), "init"], check=True)
    run(["git", "-C", str(repo_path), "config", "user.name", "Name"], check=True)
    run(["git", "-C", str(repo_path), "config", "user.email", "my@email.com"], check=True)
    for tagdir in REPO_SOURCE.iterdir():
        ver = tagdir.name
        _copy_contents(tagdir, repo_path)
        run(["git", "-C", str(repo_path), "add", "."], check=True)
        run(["git", "-C", str(repo_path), "commit", "-m", f"feat: {ver} stuff"], check=True)
        run(["git", "-C", str(repo_path), "tag", ver], check=True)
    return repo_path


def test_load_git(git_repo: Path) -> None:
    """Test that we can load modules from different commits from a git repo.

    Parameters:
        git_repo: temporary git repo
    """
    v1 = load_git(MODULE_NAME, ref="v0.1.0", repo=git_repo)
    v2 = load_git(MODULE_NAME, ref="v0.2.0", repo=git_repo)
    assert isinstance(v1, Module)
    assert isinstance(v2, Module)
    assert v1.attributes["__version__"].value == "'0.1.0'"
    assert v2.attributes["__version__"].value == "'0.2.0'"


def test_load_git_errors(git_repo: Path) -> None:
    """Test that we get informative errors for various invalid inputs.

    Parameters:
        git_repo: temporary git repo
    """
    with pytest.raises(OSError, match="Not a git repository"):
        load_git(MODULE_NAME, ref="v0.2.0", repo="not-a-repo")

    with pytest.raises(RuntimeError, match="Could not create git worktre"):
        load_git(MODULE_NAME, ref="invalid-tag", repo=git_repo)

    with pytest.raises(ImportError, match="ModuleNotFoundError: No module named 'not_a_real_module'"):
        load_git("not_a_real_module", ref="v0.2.0", repo=git_repo)


def test_git_failures(tmp_path: Path) -> None:
    """Test failures to use Git."""
    assert check(tmp_path) == 2
