#!/usr/bin/env python3

'''
Move a document to the correct documents folder
'''

import filecmp
import os
import re
import shutil
import sys

from datetime import date

_slugify_strip_re = re.compile(r'[^\w\s-]')
_slugify_hyphenate_re = re.compile(r'[-\s]+')
def slugify(value):
    '''
    Normalizes string, converts to lowercase, removes non-alpha characters,
    and converts spaces to hyphens.

    From Django's "django/template/defaultfilters.py".
    '''
    import unicodedata
    value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore')
    value = unicode(_slugify_strip_re.sub('', value).strip().lower())
    return _slugify_hyphenate_re.sub('-', value)

def usage():
    return 'Usage: mv-to-docs [SRC_DOC] [CATEGORY] [MESSAGE]'

def main(file_name='', dir_name='', message = ''):
    file_type = file_name.split('.')[-1]

    if not os.path.isfile(file_name):
        print('ERROR: Cannot find file: {}'.format(file_name))
        sys.exit(usage())

    file_date = date.fromtimestamp(os.path.getmtime(file_name))

    doc_path = os.path.expanduser('~/documents/records/{}'.format(dir_name))
    if not os.path.exists(doc_path):
        print('could not find path → creating directory: {}'.format(doc_path))
        os.mkdir(doc_path)

    path_with_year = "%s/%s".format((doc_path, file_date.strftime("%Y")))
    if not os.path.exists(path_with_year):
        os.mkdir(path_with_year)
        pass

    new_file_path = '%s/%s_%s.%s'.format(path_with_year,
                                         file_date.strftime("%Y-%m-%d"),
                                         message,
                                         file_type)

    if not os.path.isfile(new_file_path):
        print("Moving file '%s' to '%s'" % (file_name, new_file_path))
        shutil.copyfile(file_name, new_file_path)
        os.unlink(file_name)
    else:
        if filecmp.cmp(new_file_path, file_name):
            print('Two files already exist and are same: {} and {}'.format(file_name, new_file_path))
        else:
            print('destination file already exists {}'.format(new_file_path))

if __name__ == "__main__":
    try:
        file_name = sys.argv[1]
        dir_name = slugify(sys.argv[2])
    except IndexError:
        sys.exit(usage())

    try:
        message = slugify(sys.argv[3])
    except IndexError:
        message = ""

    main(file_name=file_name, dir_name=dir_name, message=message)