from django.core.management.base import copy_helper, CommandError, LabelCommand

import os

import re

from random import choice

INVALID_PROJECT_NAMES = ('django', 'site', 'test')

class Command(LabelCommand):

    help = "Creates a Django project directory structure for the given project name in the current directory."

    args = "[projectname]"

    label = 'project name'

    requires_model_validation = False

    # Can't import settings during this command, because they haven't

    # necessarily been created.

    can_import_settings = False

    def handle_label(self, project_name, **options):

        # Determine the project_name a bit naively -- by looking at the name of

        # the parent directory.

        directory = os.getcwd()

        try:

            proj_name = __import__(project_name)

            if proj_name:

                raise CommandError("%r conflicts with the name of an existing Python module and cannot be used as a project name. Please try another name." % project_name)

        except ImportError:

            if project_name in INVALID_PROJECT_NAMES:

                raise CommandError("%r contains an invalid project name. Please try another name." % project_name)

        copy_helper(self.style, 'project', project_name, directory)

        # Create a random SECRET_KEY hash, and put it in the main settings.

        main_settings_file = os.path.join(directory, project_name, 'settings.py')

        settings_contents = open(main_settings_file, 'r').read()

        fp = open(main_settings_file, 'w')

        secret_key = ''.join([choice('abcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*(-_=+)') for i in range(50)])

        settings_contents = re.sub(r"(?<=SECRET_KEY = ')'", secret_key + "'", settings_contents)

        fp.write(settings_contents)

        fp.close()