import os
from paste.request import path_info_pop
from paste.deploy import config
from wareweb import wsgiapp
from commentary import filter

def make_app_filter(
    application,
    global_conf,
    # Required configuration parameters (if any):
    storage,
    **kw):
    """
    Filters a WSGI application, adding commenting abilities.
    """
    kw['storage'] = storage
    comment_app = wsgiapp.make_wareweb_app(
        global_conf,
        package_name='commentary',
        root_path=os.path.dirname(__file__),
        **kw)
    filtered_app = filter.filter_app(application)
    full_app = AppDispatch(filtered_app, comment_app)
    conf = global_conf.copy()
    conf.update(kw)
    full_app = config.ConfigMiddleware(full_app, conf)
    return full_app

def make_app(
    global_conf, href, **kw):
    """
    Creates a commentary instance that proxies (with link rewriting)
    another site.  Can be used for local demos.
    """
    from commentary.lxmlproxy import LXMLProxy
    app = LXMLProxy(href)
    app = make_app_filter(global_conf, app, **kw)
    return app

class AppDispatch(object):

    def __init__(self, app, comment):
        self.app = app
        self.comment = comment

    def __call__(self, environ, start_response):
        environ['commentary.comment_root'] = environ['SCRIPT_NAME']
        environ['commentary.base_href'] = environ['SCRIPT_NAME'] + '/_comment'
        if environ.get('PATH_INFO', '').startswith('/_comment/'):
            path_info_pop(environ)
            return self.comment(environ, start_response)
        return self.app(environ, start_response)