# MIT License

# Copyright (c) 2022 Tung Nguyen

# 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.

import os
from importlib.machinery import SourceFileLoader
import math
import torch

def gen_load_func(parser, func):
    def load(args, cmdline):
        sub_args, cmdline = parser.parse_known_args(cmdline)
        for k, v in sub_args.__dict__.items():
            args.__dict__[k] = v
        return func(**sub_args.__dict__), cmdline
    return load


def load_module(filename):
    module_name = os.path.splitext(os.path.basename(filename))[0]
    return SourceFileLoader(module_name, filename).load_module()
    # <module "module_name" from "filename">
    #
    # ex.
    # <module "cnp" from "models/cnp.py">


def logmeanexp(x, dim=0):
    return x.logsumexp(dim) - math.log(x.shape[dim])


def stack(x, num_samples=None, dim=0):
    return x if num_samples is None \
            else torch.stack([x]*num_samples, dim=dim)


def hrminsec(duration):
    hours, left = duration // 3600, duration % 3600
    mins, secs = left // 60, left % 60
    return f"{hours}hrs {mins}mins {secs}secs"