import os

from django.core.management.base import CommandError, AppCommand, _make_writeable

from optparse import make_option

class Command(AppCommand):

    option_list = AppCommand.option_list + (

        make_option('--name', '-n', action='store', dest='command_name', default='sample',

            help='The name to use for the management command'),

        make_option('--base', '-b', action='store', dest='base_command', default='Base',

            help='The base class used for implementation of this command. Should be one of Base, App, Label, or NoArgs'),

    )

    help = ("Creates a Django management command directory structure for the given app name"

            " in the current directory.")

    args = "[appname]"

    label = 'application name'

    requires_model_validation = False

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

    # necessarily been created.

    can_import_settings = True

    def handle_app(self, app, **options):

        directory = os.getcwd()

        app_name = app.__name__.split('.')[-2]

        project_dir = os.path.join(directory, app_name)

        if not os.path.exists(project_dir):

            try:

                os.mkdir(project_dir)

            except OSError, e:

                raise CommandError(e)

        copy_template('command_template', project_dir, options.get('command_name'), '%sCommand' % options.get('base_command'))

def copy_template(template_name, copy_to, command_name, base_command):

    """copies the specified template directory to the copy_to location"""

    import django_extensions

    import re

    import shutil

    template_dir = os.path.join(django_extensions.__path__[0], 'conf', template_name)

    handle_method = "handle(self, *args, **options)"

    if base_command == 'AppCommand':

        handle_method = "handle_app(self, app, **options)"

    elif base_command == 'LabelCommand':

        handle_method = "handle_label(self, label, **options)"

    elif base_command == 'NoArgsCommand':

        handle_method = "handle_noargs(self, **options)"

    # walks the template structure and copies it

    for d, subdirs, files in os.walk(template_dir):

        relative_dir = d[len(template_dir)+1:]

        if relative_dir and not os.path.exists(os.path.join(copy_to, relative_dir)):

            os.mkdir(os.path.join(copy_to, relative_dir))

        for i, subdir in enumerate(subdirs):

            if subdir.startswith('.'):

                del subdirs[i]

        for f in files:

            if f.endswith('.pyc') or f.startswith('.DS_Store'):

                continue

            path_old = os.path.join(d, f)

            path_new = os.path.join(copy_to, relative_dir, f.replace('sample', command_name))

            if os.path.exists(path_new):

                path_new = os.path.join(copy_to, relative_dir, f)

                if os.path.exists(path_new):

                    continue

            path_new = path_new.rstrip(".tmpl")

            fp_old = open(path_old, 'r')

            fp_new = open(path_new, 'w')

            fp_new.write(fp_old.read().replace('{{ command_name }}', command_name).replace('{{ base_command }}', base_command).replace('{{ handle_method }}', handle_method))

            fp_old.close()

            fp_new.close()

            try:

                shutil.copymode(path_old, path_new)

                _make_writeable(path_new)

            except OSError:

                sys.stderr.write(style.NOTICE("Notice: Couldn't set permission bits on %s. You're probably using an uncommon filesystem setup. No problem.\n" % path_new))