# scopes.server.browser

import json
from zope.interface import implementer
from scopes.interfaces import IContainer, IView

views = {} # registry for all views: {name: {prefix: viewClass, ...}, ...}

def register(name, *contextClasses):
    """Use as decorator: `@register(name, class, ...). 
       class `None` means default view for all classes."""
    def doRegister(viewClass):
        nameEntry = views.setdefault(name, {})
        for cl in contextClasses:
            key = cl and cl.prefix or ''
            nameEntry[key] = viewClass
        return viewClass
    return doRegister

def getView(request, ob, name):
    nameEntry = views.get(name)
    if nameEntry is None:
        return None
    viewClass = nameEntry.get(ob.__class__.prefix)
    if viewClass is None:
        viewClass = nameEntry.get('')
    if viewClass is None:
        return None
    return viewClass(ob, request)


@register('index.html', None)
@register('index.json', None)
@implementer(IView)
class DefaultView:

    def __init__(self, context, request):
        self.context = context
        self.request = request

    def __call__(self):
        ob = self.context
        result = dict(head=ob.head, data=ob.data)
        if IContainer.providedBy(ob):
            result['items'] = [v.asDict() for v in ob.values()]
        return json.dumps(result)