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

from optparse import make_option

import os

import sys

def null_technical_500_response(request, exc_type, exc_value, tb):

    raise exc_type, exc_value, tb

class Command(BaseCommand):

    option_list = BaseCommand.option_list + (

        make_option('--noreload', action='store_false', dest='use_reloader', default=True,

            help='Tells Django to NOT use the auto-reloader.'),

        make_option('--browser', action='store_true', dest='open_browser',

            help='Tells Django to open a browser.'),

        make_option('--adminmedia', dest='admin_media_path', default='',

            help='Specifies the directory from which to serve admin media.'),

    )

    help = "Starts a lightweight Web server for development."

    args = '[optional port number, or ipaddr:port]'

    # Validation is called explicitly each time the server is reloaded.

    requires_model_validation = False

    def handle(self, addrport='', *args, **options):

        import django

        from django.core.servers.basehttp import run, AdminMediaHandler, WSGIServerException

        from django.core.handlers.wsgi import WSGIHandler

        try:

            from werkzeug import run_simple, DebuggedApplication

        except:

            raise CommandError("Werkzeug is required to use runserver_plus.  Please visit http://werkzeug.pocoo.org/download")

        # usurp django's handler

        from django.views import debug

        debug.technical_500_response = null_technical_500_response

        if args:

            raise CommandError('Usage is runserver %s' % self.args)

        if not addrport:

            addr = ''

            port = '8000'

        else:

            try:

                addr, port = addrport.split(':')

            except ValueError:

                addr, port = '', addrport

        if not addr:

            addr = '127.0.0.1'

        if not port.isdigit():

            raise CommandError("%r is not a valid port number." % port)

        use_reloader = options.get('use_reloader', True)

        open_browser = options.get('open_browser', False)

        admin_media_path = options.get('admin_media_path', '')

        shutdown_message = options.get('shutdown_message', '')

        quit_command = (sys.platform == 'win32') and 'CTRL-BREAK' or 'CONTROL-C'

        def inner_run():

            from django.conf import settings

            print "Validating models..."

            self.validate(display_num_errors=True)

            print "\nDjango version %s, using settings %r" % (django.get_version(), settings.SETTINGS_MODULE)

            print "Development server is running at http://%s:%s/" % (addr, port)

            print "Using the Werkzeug debugger (http://werkzeug.pocoo.org/)"

            print "Quit the server with %s." % quit_command

            path = admin_media_path or django.__path__[0] + '/contrib/admin/media'

            handler = AdminMediaHandler(WSGIHandler(), path)

            if open_browser:

                import webbrowser

                url = "http://%s:%s/" % (addr, port)

                webbrowser.open(url)

            run_simple(addr, int(port), DebuggedApplication(handler, True), 

                       use_reloader=use_reloader, use_debugger=True)            

        inner_run()