#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
import argparse
import os
import shutil
import sys


class Command(object):
    settings_module_name = 'main'

    @staticmethod
    def _setup_argparser():
        kwargs = {
            'description': 'Setup and configure the django project.',
        }
        parser = argparse.ArgumentParser(**kwargs)

        parser.add_argument('--force',
                            action='store_true', dest='force',
                            help='Overwrite existing django settings')
        return parser

    def _parse_args(self, argv=None):
        if argv is None:
            argv = sys.argv[1:]

        return self._argparser.parse_args(argv)

    def _run(self, force=False):
        settings_module_name = self.settings_module_name
        settings_file = os.path.join(settings_module_name, 'settings.py')

        if os.path.exists(settings_file):
            if not force:
                sys.stderr.write('Django settings file detected. Abort!\n')
                return os.EX_NOPERM

        if os.path.exists('manage.py') or \
                os.path.exists(settings_module_name):
            sys.stdout.write('Replacing django files...\n')
            if os.path.exists('manage.py'):
                os.unlink('manage.py')
            if os.path.exists(settings_module_name):
                shutil.rmtree(settings_module_name)
        else:
            sys.stdout.write('Installing django files...\n')

        cmd = 'django-admin startproject {name} .'.format(name=settings_module_name)
        exitval = os.system(cmd)
        if exitval != os.EX_OK:
            return exitval

        sys.stdout.write('Configure django...\n')
        add_settings_file = os.path.join('etc', 'django', 'additional_settings.py')
        with open(settings_file, 'a') as f_out:
            with open(add_settings_file) as f_in:
                f_out.write(f_in.read())

        sys.stdout.write('Creating directories...\n')
        dirs = [
            os.path.join('var', 'db'),
            os.path.join('var', 'log'),
            os.path.join('var', 'www', 'static'),
        ]
        for d in dirs:
            sys.stdout.write('  - %s\n' % d)
            if not os.path.exists(d):
                os.makedirs(d)

        return os.EX_OK

    def __init__(self):
        self._argparser = self._setup_argparser()

    def __call__(self, argv=None):
        cmd_args = self._parse_args(argv)
        exitval = self._run(cmd_args.force)
        return exitval


def main():
    cmd = Command()
    exitval = cmd()
    sys.exit(exitval)


if __name__ == '__main__':
    main()