""" Backup files.
"""

import os.path
import shutil
import datetime

ROOT_DIR = os.path.abspath(os.path.join(os.sep, 'backup-from-folder'))
ERROR_LOG_FILE = os.path.join(os.sep, ROOT_DIR, 'logs', 'errorlog.txt')

CURRENT_DATE = str(datetime.datetime.now().date())

FILES_TO_BACKUP = [
    'file-1.txt',
    'file-2.txt'
]

def backup_data_entry_files():
    """ Backup files.
    """


    for filename in FILES_TO_BACKUP:

        if os.path.isfile(filename):
            # 1. Extract Directory name.
            dirname = os.path.dirname(filename)

            # 2. Extract filename and extension.
            fn, fe = os.path.splitext(filename)

            # 3. Append date to new filename.
            new_filename = os.path.basename(fn + '-' + CURRENT_DATE + fe)

            # 4. Construct the new destination.
            destination = os.path.join(dirname, 'backup-folder-name', new_filename)

            # 5. Attempt to copy.
            if not os.path.exists(destination):
                try:
                    shutil.copy(os.path.normpath(filename), destination)
                except IOError, e:
                    with open(ERROR_LOG_FILE, 'a') as f:
                        f.write('%s \nUnable to copy file. %s' % (CURRENT_DATE, e))

        else:
            with open(ERROR_LOG_FILE, 'a') as f:
                f.write('%s\nFile "%s" does not exist\n\n' % (CURRENT_DATE, filename))

if __name__ == '__main__':
    backup_data_entry_files()