# Copyright (c) OpenMMLab. All rights reserved.
from argparse import ArgumentParser

from mmengine.utils import revert_sync_batchnorm

from mmseg.apis import inference_model, init_model, show_result_pyplot
from mmseg.utils import register_all_modules


def main():
    parser = ArgumentParser()
    parser.add_argument('img', help='Image file')
    parser.add_argument('config', help='Config file')
    parser.add_argument('checkpoint', help='Checkpoint file')
    parser.add_argument(
        '--device', default='cuda:0', help='Device used for inference')
    parser.add_argument(
        '--save-dir',
        default=None,
        help='Save file dir for all storage backends.')
    parser.add_argument(
        '--opacity',
        type=float,
        default=0.5,
        help='Opacity of painted segmentation map. In (0, 1] range.')
    parser.add_argument(
        '--title', default='result', help='The image identifier.')
    args = parser.parse_args()

    register_all_modules()

    # build the model from a config file and a checkpoint file
    model = init_model(args.config, args.checkpoint, device=args.device)
    if args.device == 'cpu':
        model = revert_sync_batchnorm(model)
    # test a single image
    result = inference_model(model, args.img)
    # show the results
    show_result_pyplot(
        model,
        args.img, [result],
        title=args.title,
        opacity=args.opacity,
        draw_gt=False,
        show=False if args.save_dir is not None else True,
        save_dir=args.save_dir)


if __name__ == '__main__':
    main()