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"""

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    Per-site stuff

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"""

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import imp

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from qmsk.web import handler

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class Site (handler.RequestHandler) :

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    """

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        A site is a website and its configuration

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        XXX: need to somehow communicate the site name to our downstream handler

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    """

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    def __init__ (self, name, handler) :

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        """

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            The given name must be like a valid hostname, e.g. 'www.qmsk.net'

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        """

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        # store

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        self.name = name

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        self.handler = handler

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    def handle_request (self, request) :

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        """

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            Map the request through our handler...

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        """

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        return self.handler.handle_request(request)

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class SiteModule (Site) :

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    """

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        A site, represented as python module/package, with the following module attributes:

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            handler     - the RequestHandler to use

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    """

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    def __init__ (self, name, module) :

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        """

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            Create the Site based on the given module

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        """

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        super(SiteModule, self).__init__(name,

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            module.handler

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        )

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class SiteModuleCollection (handler.RequestHandler) :

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    """

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        A collection of SiteModules, looking up the correct site to use based on the request hostname

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    """

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    def __init__ (self, path) :

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        """

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            Initialize to load site modules from the given path

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        """

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        self.path = path

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        self.site_cache = dict()

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    def handle_request (self, request) :

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        """

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            Lookup and return a Site object for the given request

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        """

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        # request hostnmae

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        name = request.env['HTTP_HOST']

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        # already loaded?

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        if name in self.site_cache :

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            site = self.site_cache[name]

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        else :

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            # first, we need to find it

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            file, pathname, description = imp.find_module(name, [self.path])

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            # then, we can load the module

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            module = imp.load_module(name, file, pathname, description)

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            # then build+cache the SiteModule

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            site = self.site_cache[name] = SiteModule(name, module)

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        # then execute the site's request handler

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        return site.handle_request(request)

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