# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
''' Ref: https://github.com/ScanNet/ScanNet/blob/master/BenchmarkScripts '''
import csv
import os

import numpy as np
from plyfile import PlyData


def represents_int(s):
    ''' if string s represents an int. '''
    try:
        int(s)
        return True
    except ValueError:
        return False


def read_label_mapping(filename,
                       label_from='raw_category',
                       label_to='nyu40id'):
    assert os.path.isfile(filename)
    mapping = dict()
    with open(filename) as csvfile:
        reader = csv.DictReader(csvfile, delimiter='\t')
        for row in reader:
            mapping[row[label_from]] = int(row[label_to])
    if represents_int(list(mapping.keys())[0]):
        mapping = {int(k): v for k, v in mapping.items()}
    return mapping


def read_mesh_vertices(filename):
    """ read XYZ for each vertex.
    """
    assert os.path.isfile(filename)
    with open(filename, 'rb') as f:
        plydata = PlyData.read(f)
        num_verts = plydata['vertex'].count
        vertices = np.zeros(shape=[num_verts, 3], dtype=np.float32)
        vertices[:, 0] = plydata['vertex'].data['x']
        vertices[:, 1] = plydata['vertex'].data['y']
        vertices[:, 2] = plydata['vertex'].data['z']
    return vertices


def read_mesh_vertices_rgb(filename):
    """ read XYZ RGB for each vertex.
    Note: RGB values are in 0-255
    """
    assert os.path.isfile(filename)
    with open(filename, 'rb') as f:
        plydata = PlyData.read(f)
        num_verts = plydata['vertex'].count
        vertices = np.zeros(shape=[num_verts, 6], dtype=np.float32)
        vertices[:, 0] = plydata['vertex'].data['x']
        vertices[:, 1] = plydata['vertex'].data['y']
        vertices[:, 2] = plydata['vertex'].data['z']
        vertices[:, 3] = plydata['vertex'].data['red']
        vertices[:, 4] = plydata['vertex'].data['green']
        vertices[:, 5] = plydata['vertex'].data['blue']
    return vertices