# Copyright (c) OpenMMLab. All rights reserved.
import mmengine.fileio as fileio

from mmseg.registry import DATASETS
from .basesegdataset import BaseSegDataset


@DATASETS.register_module()
class ChaseDB1Dataset(BaseSegDataset):
    """Chase_db1 dataset.

    In segmentation map annotation for Chase_db1, 0 stands for background,
    which is included in 2 categories. ``reduce_zero_label`` is fixed to False.
    The ``img_suffix`` is fixed to '.png' and ``seg_map_suffix`` is fixed to
    '_1stHO.png'.
    """
    METAINFO = dict(
        classes=('background', 'vessel'),
        palette=[[120, 120, 120], [6, 230, 230]])

    def __init__(self,
                 img_suffix='.png',
                 seg_map_suffix='_1stHO.png',
                 reduce_zero_label=False,
                 **kwargs) -> None:
        super().__init__(
            img_suffix=img_suffix,
            seg_map_suffix=seg_map_suffix,
            reduce_zero_label=reduce_zero_label,
            **kwargs)
        assert fileio.exists(
            self.data_prefix['img_path'], backend_args=self.backend_args)