# -*- coding: utf-8 -*-
"""
print_settings
==============

Django command similar to 'diffsettings' but shows all active Django settings.
"""

import fnmatch
import json

from django.conf import settings
from django.core.management.base import BaseCommand, CommandError

from django_extensions.management.utils import signalcommand


class Command(BaseCommand):
    help = "Print the active Django settings."

    def add_arguments(self, parser):
        super().add_arguments(parser)
        parser.add_argument(
            'setting',
            nargs='*',
            help='Specifies setting to be printed.'
        )
        parser.add_argument(
            '-f', '--fail',
            action='store_true',
            dest='fail',
            help='Fail if invalid setting name is given.'
        )
        parser.add_argument(
            '--format',
            default='simple',
            dest='format',
            help='Specifies output format.'
        )
        parser.add_argument(
            '--indent',
            default=4,
            dest='indent',
            type=int,
            help='Specifies indent level for JSON and YAML'
        )

    @signalcommand
    def handle(self, *args, **options):
        setting_names = options['setting']
        settings_dct = {k: getattr(settings, k) for k in dir(settings) if k.isupper()}

        if setting_names:
            settings_dct = {
                key: value for key, value in settings_dct.items()
                if any(fnmatch.fnmatchcase(key, setting_name) for setting_name in setting_names)
            }

        if options['fail']:
            for setting_name in setting_names:
                if not any(fnmatch.fnmatchcase(key, setting_name) for key in settings_dct.keys()):
                    raise CommandError('%s not found in settings.' % setting_name)

        output_format = options['format']
        indent = options['indent']

        if output_format == 'json':
            print(json.dumps(settings_dct, indent=indent))
        elif output_format == 'yaml':
            import yaml  # requires PyYAML
            print(yaml.dump(settings_dct, indent=indent))
        elif output_format == 'pprint':
            from pprint import pprint
            pprint(settings_dct)
        elif output_format == 'text':
            for key, value in settings_dct.items():
                print("%s = %s" % (key, value))
        elif output_format == 'value':
            for value in settings_dct.values():
                print(value)
        else:
            for key, value in settings_dct.items():
                print('%-40s = %r' % (key, value))