import os.path as osp
import shutil
import time

from click.testing import CliRunner

from mim.commands.install import cli as install
from mim.commands.run import cli as run
from mim.utils import download_from_file, extract_tar, is_installed

dataset_url = 'https://download.openmmlab.com/mim/dataset.tar'
cfg_url = 'https://download.openmmlab.com/mim/resnet18_b16x8_custom.py'
ckpt_url = 'https://download.openmmlab.com/mim/epoch_3.pth'


def setup_module():
    runner = CliRunner()

    if not is_installed('mmcls'):
        result = runner.invoke(install, ['mmcls', '--yes'])
        assert result.exit_code == 0


def test_run():
    runner = CliRunner()

    if not osp.exists('/tmp/dataset'):
        download_from_file(dataset_url, '/tmp/dataset.tar')
        extract_tar('/tmp/dataset.tar', '/tmp/')

    if not osp.exists('/tmp/config.py'):
        download_from_file(cfg_url, '/tmp/config.py')

    if not osp.exists('/tmp/ckpt.pth'):
        download_from_file(ckpt_url, '/tmp/ckpt.pth')

    # wait for the download task to complete
    time.sleep(5)

    result = runner.invoke(
        run,
        ['mmcls', 'train', '/tmp/config.py', '--device=cpu', '--work-dir=tmp'])
    assert result.exit_code == 0
    result = runner.invoke(run, [
        'mmcls', 'test', '/tmp/config.py', '/tmp/ckpt.pth',
        '--metrics=accuracy'
    ])
    assert result.exit_code == 0
    result = runner.invoke(run, [
        'mmcls', 'xxx', '/tmp/config.py', '/tmp/ckpt.pth', '--metrics=accuracy'
    ])
    assert result.exit_code != 0
    result = runner.invoke(run, [
        'mmcls', 'test', '/tmp/xxx.py', '/tmp/ckpt.pth', '--metrics=accuracy'
    ])
    assert result.exit_code != 0

    shutil.rmtree('tmp')