import os
from django.core.management.base import BaseCommand, CommandError
from django.template.loader import render_to_string


DEFAULT_FILE = "menu.py"


class Command(BaseCommand):
    help = (
        "Creates a template file containing the base code to get you "
        "started with your custom menu"
    )

    def add_arguments(self, parser):
        parser.add_argument("output_file", type=str)

    def handle(self, output_file=None, **options):
        project_name = os.path.basename(os.getcwd())
        dst = output_file is not None and output_file or DEFAULT_FILE
        if os.path.exists(dst):
            raise CommandError('Error: file "%s" already exists' % dst)

        with open(dst, "w") as f:
            f.write(
                render_to_string(
                    "admin_tools/menu/menu.txt",
                    {
                        "project": project_name,
                        "file": os.path.basename(dst).split(".")[0],
                    },
                )
            )
        self.stdout.write('"%s" written.' % os.path.join(dst))