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import os
import pytest

# Command line arguments for pytest
def pytest_addoption(parser):
    parser.addoption('--baseline_dir', action="store", default='tests/inference/baseline', help='Directory for ground-truth images')
    parser.addoption('--test_dir', action="store", default='tests/inference/samples', help='Directory for images to test')
    parser.addoption('--metrics_file', action="store", default='tests/metrics.md', help='Output file for metrics')
    parser.addoption('--img_output_dir', action="store", default='tests/compare/samples', help='Output directory for diff metric images')

# This initializes args at the beginning of the test session
@pytest.fixture(scope="session", autouse=True)
def args_pytest(pytestconfig):
    args = {}
    args['baseline_dir'] = pytestconfig.getoption('baseline_dir')
    args['test_dir'] = pytestconfig.getoption('test_dir')
    args['metrics_file'] = pytestconfig.getoption('metrics_file')
    args['img_output_dir'] = pytestconfig.getoption('img_output_dir')

    # Initialize metrics file
    with open(args['metrics_file'], 'a') as f:
        # if file is empty, write header
        if os.stat(args['metrics_file']).st_size == 0:
            f.write("| date | run | file | status | value | \n")
            f.write("| --- | --- | --- | --- | --- | \n")

    return args


def gather_file_basenames(directory: str):
    files = []
    for file in os.listdir(directory):
        if file.endswith(".png"):
            files.append(file)
    return files

# Creates the list of baseline file names to use as a fixture
def pytest_generate_tests(metafunc):
    if "baseline_fname" in metafunc.fixturenames:
        baseline_fnames = gather_file_basenames(metafunc.config.getoption("baseline_dir"))
        metafunc.parametrize("baseline_fname", baseline_fnames)