#!/usr/bin/env python

from __future__ import print_function

import argparse
import glob
import json
import os
import os.path as osp
import sys

import numpy as np
import PIL.Image

import labelme


def main():
    parser = argparse.ArgumentParser(
        formatter_class=argparse.ArgumentDefaultsHelpFormatter
    )
    parser.add_argument('label_dir', help='input annotated directory')
    parser.add_argument('output_dir', help='output dataset directory')
    args = parser.parse_args()

    if osp.exists(args.output_dir):
        print('Output directory already exists:', args.output_dir)
        sys.exit(1)

    os.makedirs(args.output_dir)
    os.makedirs(osp.join(args.output_dir, 'JPEGImages'))
    os.makedirs(osp.join(args.output_dir, 'SegmentationClassPNG'))
    print('Creating dataset:', args.output_dir)

    # get the all class names for the given dataset
    class_names = ['_background_']
    for label_file in glob.glob(osp.join(args.label_dir, '*.json')):
        with open(label_file) as f:
            data = json.load(f)
            if data['outputs']:
                for output in data['outputs']['object']:
                    name = output['name']
                    cls_name = name
                    if not cls_name in class_names:
                        class_names.append(cls_name)

    class_name_to_id = {}
    for i, class_name in enumerate(class_names):
        class_id = i  # starts with 0
        class_name_to_id[class_name] = class_id
        if class_id == 0:
            assert class_name == '_background_'
    class_names = tuple(class_names)
    print('class_names:', class_names)

    out_class_names_file = osp.join(args.output_dir, 'class_names.txt')
    with open(out_class_names_file, 'w') as f:
        f.writelines('\n'.join(class_names))
    print('Saved class_names:', out_class_names_file)

    for label_file in glob.glob(osp.join(args.label_dir, '*.json')):
        print('Generating dataset from:', label_file)
        with open(label_file) as f:
            base = osp.splitext(osp.basename(label_file))[0]
            out_img_file = osp.join(
                args.output_dir, 'JPEGImages', base + '.jpg')
            out_png_file = osp.join(
                args.output_dir, 'SegmentationClassPNG', base + '.png')

            data = json.load(f)

            data_shapes = []
            if data['outputs']:
                for output in data['outputs']['object']:
                    if 'polygon' in output.keys():
                        polygon = output['polygon']
                        name = output['name']

                        # convert jingling format to labelme format
                        points = []
                        for i in range(1, int(len(polygon) / 2) + 1):
                            points.append([polygon['x' + str(i)], polygon['y' + str(i)]])
                        shape = {'label': name, 'points': points, 'shape_type': 'polygon'}
                        data_shapes.append(shape)

            img_file = osp.join(osp.dirname(label_file), data['path'])
            img = np.asarray(PIL.Image.open(img_file))
            PIL.Image.fromarray(img).save(out_img_file)

            lbl = labelme.utils.shapes_to_label(
                img_shape=img.shape,
                shapes=data_shapes,
                label_name_to_value=class_name_to_id,
            )

            if osp.splitext(out_png_file)[1] != '.png':
                out_png_file += '.png'
            # Assume label ranses [0, 255] for uint8,
            if lbl.min() >= 0 and lbl.max() <= 255:
                lbl_pil = PIL.Image.fromarray(lbl.astype(np.uint8), mode='L')
                lbl_pil.save(out_png_file)
            else:
                raise ValueError(
                    '[%s] Cannot save the pixel-wise class label as PNG. '
                    'Please consider using the .npy format.' % out_png_file
                )


if __name__ == '__main__':
    main()