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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import re


class Application(object):
    urls = {}
    charset = 'utf-8'

    def __call__(self, environ, start_response):
        path = environ.get('PATH_INFO', '').strip('/')
        headers = [('Content-Type', 'text/html; charset=%s' % self.charset)]
        status = '200 OK'
        for regex, handler in self.urls.iteritems():
            matchobj = regex.search(path)
            if not matchobj is None:
                response = handler(environ, *matchobj.groups())
                if isinstance(response, tuple):
                    if len(response) == 3:
                        response, headers, status = response
                    else:
                        response, headers = response
                if isinstance(response, unicode):
                    response = [response.decode(self.charset)]
                elif isinstance(response, str):
                    response = [response]
                start_response(status, headers)
                return iter(response)
        # error page
        start_response('404 NOT FOUND', headers)
        return ['Page Not Found']
    

def export(regex):
    def wrapped(f):
        Application.urls[re.compile(regex)] = f
        return f
    return wrapped


@export('^$')
def index(environ):
    return 'Hello from the Index'

@export('^downloads$')
def downloads(environ):
    return 'Hello from the Downloads'


app = Application()

if __name__ == '__main__':
    from paste.httpserver import serve
    serve(app)