#!/usr/bin/env python
# -*- coding: utf-8 -*-
#######################################################################################
# The MIT License

# Copyright (c) 2014       Hannes Schulz, University of Bonn  <schulz@ais.uni-bonn.de>
# Copyright (c) 2013       Benedikt Waldvogel, University of Bonn <mail@bwaldvogel.de>
# Copyright (c) 2008-2009  Sebastian Nowozin                       <nowozin@gmail.com>

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#######################################################################################
#
# Helper script to convert the NYU Depth v2 dataset Matlab file into a set of
# PNG and JPEG images.
#
# See https://github.com/deeplearningais/curfil/wiki/Training-and-Prediction-with-the-NYU-Depth-v2-Dataset

from __future__ import print_function

import h5py
import numpy as np
import os
import scipy.io
import sys
import cv2


def convert_image(i, scene, depth, image, folder):
    img_depth = depth * 1000.0
    img_depth_uint16 = img_depth.astype(np.uint16)
    cv2.imwrite("%s/%05d_depth.png" % (folder, i), img_depth_uint16)

    image = image[:, :, ::-1]
    image_black_boundary = np.zeros((480, 640, 3), dtype=np.uint8)
    image_black_boundary[7:474, 7:632, :] = image[7:474, 7:632, :]
    cv2.imwrite("%s/%05d.jpg" % (folder, i), image_black_boundary)


if __name__ == "__main__":

    if len(sys.argv) < 4:
        print("usage: %s <h5_file> <train_test_split> <out_folder>" % sys.argv[0], file=sys.stderr)
        sys.exit(0)

    h5_file = h5py.File(sys.argv[1], "r")
    # h5py is not able to open that file. but scipy is
    train_test = scipy.io.loadmat(sys.argv[2])
    out_folder = sys.argv[3]

    test_images = set([int(x) for x in train_test["testNdxs"]])
    train_images = set([int(x) for x in train_test["trainNdxs"]])
    print("%d training images" % len(train_images))
    print("%d test images" % len(test_images))

    depth = h5_file['depths']

    print("reading", sys.argv[1])

    images = h5_file['images']
    scenes = [u''.join(chr(c) for c in h5_file[obj_ref]) for obj_ref in h5_file['sceneTypes'][0]]

    print("processing images")
    for i, image in enumerate(images):
        print("image", i + 1, "/", len(images))

        idx = int(i) + 1
        if idx in train_images:
            train_test = "train"
        else:
            assert idx in test_images, "index %d neither found in training set nor in test set" % idx
            train_test = "test"

        folder = "%s/%s/%s" % (out_folder, train_test, scenes[i])
        if not os.path.exists(folder):
            os.makedirs(folder)
        convert_image(i, scenes[i], depth[i, :, :].T, image.T, folder)

    print("Finished")