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

from mmpose.apis.inferencers import MMPoseInferencer, get_model_aliases


def parse_args():
    parser = ArgumentParser()
    parser.add_argument(
        'inputs',
        type=str,
        nargs='?',
        help='Input image/video path or folder path.')
    parser.add_argument(
        '--pose2d',
        type=str,
        default=None,
        help='Pretrained 2D pose estimation algorithm. It\'s the path to the '
        'config file or the model name defined in metafile.')
    parser.add_argument(
        '--pose2d-weights',
        type=str,
        default=None,
        help='Path to the custom checkpoint file of the selected pose model. '
        'If it is not specified and "pose2d" is a model name of metafile, '
        'the weights will be loaded from metafile.')
    parser.add_argument(
        '--det-model',
        type=str,
        default=None,
        help='Config path or alias of detection model.')
    parser.add_argument(
        '--det-weights',
        type=str,
        default=None,
        help='Path to the checkpoints of detection model.')
    parser.add_argument(
        '--det-cat-ids',
        type=int,
        nargs='+',
        default=0,
        help='Category id for detection model.')
    parser.add_argument(
        '--scope',
        type=str,
        default='mmpose',
        help='Scope where modules are defined.')
    parser.add_argument(
        '--device',
        type=str,
        default=None,
        help='Device used for inference. '
        'If not specified, the available device will be automatically used.')
    parser.add_argument(
        '--show',
        action='store_true',
        help='Display the image/video in a popup window.')
    parser.add_argument(
        '--draw-bbox',
        action='store_true',
        help='Whether to draw the bounding boxes.')
    parser.add_argument(
        '--draw-heatmap',
        action='store_true',
        default=False,
        help='Whether to draw the predicted heatmaps.')
    parser.add_argument(
        '--bbox-thr',
        type=float,
        default=0.3,
        help='Bounding box score threshold')
    parser.add_argument(
        '--nms-thr',
        type=float,
        default=0.3,
        help='IoU threshold for bounding box NMS')
    parser.add_argument(
        '--kpt-thr', type=float, default=0.3, help='Keypoint score threshold')
    parser.add_argument(
        '--radius',
        type=int,
        default=3,
        help='Keypoint radius for visualization.')
    parser.add_argument(
        '--thickness',
        type=int,
        default=1,
        help='Link thickness for visualization.')
    parser.add_argument(
        '--vis-out-dir',
        type=str,
        default='',
        help='Directory for saving visualized results.')
    parser.add_argument(
        '--pred-out-dir',
        type=str,
        default='',
        help='Directory for saving inference results.')
    parser.add_argument(
        '--show-alias',
        action='store_true',
        help='Display all the available model aliases.')

    call_args = vars(parser.parse_args())

    init_kws = [
        'pose2d', 'pose2d_weights', 'scope', 'device', 'det_model',
        'det_weights', 'det_cat_ids'
    ]
    init_args = {}
    init_args['output_heatmaps'] = call_args.pop('draw_heatmap')
    for init_kw in init_kws:
        init_args[init_kw] = call_args.pop(init_kw)

    diaplay_alias = call_args.pop('show_alias')

    return init_args, call_args, diaplay_alias


def display_model_aliases(model_aliases: Dict[str, str]) -> None:
    """Display the available model aliases and their corresponding model
    names."""
    aliases = list(model_aliases.keys())
    max_alias_length = max(map(len, aliases))
    print(f'{"ALIAS".ljust(max_alias_length+2)}MODEL_NAME')
    for alias in sorted(aliases):
        print(f'{alias.ljust(max_alias_length+2)}{model_aliases[alias]}')


def main():
    init_args, call_args, diaplay_alias = parse_args()
    if diaplay_alias:
        model_alises = get_model_aliases(init_args['scope'])
        display_model_aliases(model_alises)
    else:
        inferencer = MMPoseInferencer(**init_args)
        for _ in inferencer(**call_args):
            pass


if __name__ == '__main__':
    main()