# -*- coding: utf-8 -*-
# Distributed under the (new) BSD License. See LICENSE.txt for more info.

"""Functionality used for testing. This code itself is not covered in tests."""

import os
import sys
import pytest

# Get root dir
THIS_DIR = os.path.abspath(os.path.dirname(__file__))
ROOT_DIR = THIS_DIR
for i in range(9):
    ROOT_DIR = os.path.dirname(ROOT_DIR)
    if os.path.isfile(os.path.join(ROOT_DIR, ".gitignore")):
        break


# Functions to use from invoke tasks


def test_unit(cov_report="term"):
    """Run all unit tests. Returns exit code."""
    orig_dir = os.getcwd()
    os.chdir(ROOT_DIR)
    try:
        _clear_imageio()
        _enable_faulthandler()
        return pytest.main(
            [
                "-v",
                "--cov",
                "imageio",
                "--cov-config",
                ".coveragerc",
                "--cov-report",
                cov_report,
                "tests",
            ]
        )
    finally:
        os.chdir(orig_dir)
        import imageio

        print("Tests were performed on", str(imageio))


# Requirements


def _enable_faulthandler():
    """Enable faulthandler (if we can), so that we get tracebacks
    on segfaults.
    """
    try:
        import faulthandler

        faulthandler.enable()
        print("Faulthandler enabled")
    except Exception:
        print("Could not enable faulthandler")


def _clear_imageio():
    # Remove ourselves from sys.modules to force an import
    for key in list(sys.modules.keys()):
        if key.startswith("imageio"):
            del sys.modules[key]