# Copyright (c) OpenMMLab. All rights reserved.
import argparse
import os.path as osp

import mmcv
import numpy as np
from mmcv import Config, DictAction

from mmselfsup.datasets.builder import build_dataset
from mmselfsup.registry import VISUALIZERS
from mmselfsup.utils import register_all_modules


def parse_args():
    parser = argparse.ArgumentParser(description='Browse a dataset')
    parser.add_argument('config', help='train config file path')
    parser.add_argument(
        '--output-dir',
        default=None,
        type=str,
        help='If there is no display interface, you can save it')
    parser.add_argument('--not-show', default=False, action='store_true')
    parser.add_argument(
        '--show-interval',
        type=float,
        default=2,
        help='the interval of show (s)')
    parser.add_argument(
        '--cfg-options',
        nargs='+',
        action=DictAction,
        help='override some settings in the used config, the key-value pair '
        'in xxx=yyy format will be merged into config file. If the value to '
        'be overwritten is a list, it should be like key="[a,b]" or key=a,b '
        'It also allows nested list/tuple values, e.g. key="[(a,b),(c,d)]" '
        'Note that the quotation marks are necessary and that no white space '
        'is allowed.')
    args = parser.parse_args()
    return args


def main():
    args = parse_args()
    cfg = Config.fromfile(args.config)
    if args.cfg_options is not None:
        cfg.merge_from_dict(args.cfg_options)

    # register all modules in mmselfsup into the registries
    register_all_modules()

    dataset = build_dataset(cfg.train_dataloader.dataset)

    visualizer = VISUALIZERS.build(cfg.visualizer)
    visualizer.dataset_meta = dataset.METAINFO

    progress_bar = mmcv.ProgressBar(len(dataset))
    for item in dataset:
        if 'pseudo_label' in item['data_sample']:
            # for rotation_pred
            if 'rot_label' in item['data_sample'].pseudo_label:
                img = np.concatenate(item['inputs'], axis=-1)
                img = np.transpose(img, (1, 2, 0))
            # for relative_loc
            else:
                img = item['inputs'][0].permute(1, 2, 0).numpy()
        # for contrastive learning
        elif len(item['inputs']) == 2 and 'mask' not in item['data_sample']:
            img = np.concatenate(item['inputs'], axis=-1)
            img = np.transpose(img, (1, 2, 0))
        # for mask image modeling
        else:
            img = item['inputs'][0].permute(1, 2, 0).numpy()
        data_sample = item['data_sample']
        img_path = osp.basename(item['data_sample'].img_path)

        out_file = osp.join(
            args.output_dir,
            osp.basename(img_path)) if args.output_dir is not None else None

        img = img[..., [2, 1, 0]]  # bgr to rgb

        visualizer.add_datasample(
            name=osp.basename(img_path),
            image=img,
            gt_sample=data_sample,
            show=not args.not_show,
            wait_time=args.show_interval,
            out_file=out_file)

        progress_bar.update()


if __name__ == '__main__':
    main()