#!/usr/bin/env python

import gudhi
import argparse

""" This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
    Author(s):       Vincent Rouvreau

    Copyright (C) 2018 Inria

    Modification(s):
      - YYYY/MM Author: Description of the modification
"""

__author__ = "Vincent Rouvreau"
__copyright__ = "Copyright (C) 2018 Inria"
__license__ = "MIT"

parser = argparse.ArgumentParser(
    description="Nerve of a covering creation " "from points read in a OFF file.",
    epilog="Example: "
    "example/nerve_of_a_covering.py "
    "-f ../data/points/human.off -c 2 -r 10 -g 0.3"
    "- Constructs Nerve of a covering with the "
    "points from the given OFF file.",
)
parser.add_argument("-f", "--file", type=str, required=True)
parser.add_argument("-c", "--coordinate", type=int, default=0)
parser.add_argument("-r", "--resolution", type=int, default=10)
parser.add_argument("-g", "--gain", type=float, default=0.3)
parser.add_argument(
    "-v",
    "--verbose",
    default=False,
    action="store_true",
    help="Flag for program verbosity",
)

args = parser.parse_args()

nerve_complex = gudhi.CoverComplex()
nerve_complex.set_verbose(args.verbose)

if nerve_complex.read_point_cloud(args.file):
    nerve_complex.set_type("Nerve")
    nerve_complex.set_color_from_coordinate(args.coordinate)
    nerve_complex.set_function_from_coordinate(args.coordinate)
    nerve_complex.set_graph_from_OFF()
    nerve_complex.set_resolution_with_interval_number(args.resolution)
    nerve_complex.set_gain(args.gain)
    nerve_complex.set_cover_from_function()
    nerve_complex.find_simplices()
    nerve_complex.write_info()
    simplex_tree = nerve_complex.create_simplex_tree()
    nerve_complex.compute_PD()
    if args.verbose:
        print("Iterator on graph induced complex simplices")
        result_str = (
            "Nerve is of dimension "
            + repr(simplex_tree.dimension())
            + " - "
            + repr(simplex_tree.num_simplices())
            + " simplices - "
            + repr(simplex_tree.num_vertices())
            + " vertices."
        )
        print(result_str)
        for filtered_value in simplex_tree.get_filtration():
            print(filtered_value[0])