import json
import os.path as osp

from labelme.utils import image as image_module
from labelme.utils import shape as shape_module


here = osp.dirname(osp.abspath(__file__))
data_dir = osp.join(here, '../data')


def get_img_and_data():
    json_file = osp.join(data_dir, 'apc2016_obj3.json')
    data = json.load(open(json_file))
    img_b64 = data['imageData']
    img = image_module.img_b64_to_arr(img_b64)
    return img, data


def get_img_and_lbl():
    img, data = get_img_and_data()

    label_name_to_value = {'__background__': 0}
    for shape in data['shapes']:
        label_name = shape['label']
        label_value = len(label_name_to_value)
        label_name_to_value[label_name] = label_value

    n_labels = max(label_name_to_value.values()) + 1
    label_names = [None] * n_labels
    for label_name, label_value in label_name_to_value.items():
        label_names[label_value] = label_name

    lbl = shape_module.shapes_to_label(
        img.shape, data['shapes'], label_name_to_value
    )
    return img, lbl, label_names