import functools
import os
import shutil

import torch


def logging(s, log_path, print_=True, log_=True):
    if print_:
        print(s)
    if log_:
        with open(log_path, 'a+') as f_log:
            f_log.write(s + '\n')


def get_logger(log_path, **kwargs):
    return functools.partial(logging, log_path=log_path, **kwargs)


def create_exp_dir(dir_path, scripts_to_save=None, debug=False):
    if debug:
        print('Debug Mode : no experiment dir created')
        return functools.partial(logging, log_path=None, log_=False)

    if not os.path.exists(dir_path):
        os.makedirs(dir_path)

    print('Experiment dir : {}'.format(dir_path))
    if scripts_to_save is not None:
        script_path = os.path.join(dir_path, 'scripts')
        if not os.path.exists(script_path):
            os.makedirs(script_path)
        for script in scripts_to_save:
            dst_file = os.path.join(
                dir_path, 'scripts', os.path.basename(script))
            shutil.copyfile(script, dst_file)

    return get_logger(log_path=os.path.join(dir_path, 'log.txt'))


def save_checkpoint(model, optimizer, path, epoch):
    torch.save(model, os.path.join(path, 'model_{}.pt'.format(epoch)))
    torch.save(optimizer.state_dict(),
               os.path.join(path, 'optimizer_{}.pt'.format(epoch)))
