#!/usr/bin/env python

import argparse
import sys

import imgviz
import matplotlib.pyplot as plt

from labelme.label_file import LabelFile
from labelme import utils


PY2 = sys.version_info[0] == 2


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('json_file')
    args = parser.parse_args()

    label_file = LabelFile(args.json_file)
    img = utils.img_data_to_arr(label_file.imageData)

    label_name_to_value = {'_background_': 0}
    for shape in sorted(label_file.shapes, key=lambda x: x['label']):
        label_name = shape['label']
        if label_name in label_name_to_value:
            label_value = label_name_to_value[label_name]
        else:
            label_value = len(label_name_to_value)
            label_name_to_value[label_name] = label_value
    lbl, _ = utils.shapes_to_label(
        img.shape, label_file.shapes, label_name_to_value
    )

    label_names = [None] * (max(label_name_to_value.values()) + 1)
    for name, value in label_name_to_value.items():
        label_names[value] = name
    lbl_viz = imgviz.label2rgb(
        label=lbl,
        img=imgviz.asgray(img),
        label_names=label_names,
        font_size=30,
        loc='rb',
    )

    plt.subplot(121)
    plt.imshow(img)
    plt.subplot(122)
    plt.imshow(lbl_viz)
    plt.show()


if __name__ == '__main__':
    main()