# Copyright 2011 GRNET S.A. All rights reserved.
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from django.conf.urls.defaults import patterns
from django.http import HttpResponse
from django.template.loader import render_to_string
from django.utils import simplejson as json

from synnefo.api import util
from synnefo.db.models import Flavor


urlpatterns = patterns('synnefo.api.flavors',
    (r'^(?:/|.json|.xml)?$', 'list_flavors'),
    (r'^/detail(?:.json|.xml)?$', 'list_flavors', {'detail': True}),
    (r'^/(\d+)(?:.json|.xml)?$', 'get_flavor_details'),
)


def flavor_to_dict(flavor, detail=True):
    d = {'id': flavor.id, 'name': flavor.name}
    if detail:
        d['ram'] = flavor.ram
        d['disk'] = flavor.disk
        d['cpu'] = flavor.cpu
    return d


@util.api_method('GET')
def list_flavors(request, detail=False):
    # Normal Response Codes: 200, 203
    # Error Response Codes: computeFault (400, 500),
    #                       serviceUnavailable (503),
    #                       unauthorized (401),
    #                       badRequest (400),
    #                       overLimit (413)

    all_flavors = Flavor.objects.all()
    flavors = [flavor_to_dict(flavor, detail) for flavor in all_flavors]

    if request.serialization == 'xml':
        data = render_to_string('list_flavors.xml', {
            'flavors': flavors,
            'detail': detail})
    else:
        data = json.dumps({'flavors': {'values': flavors}})

    return HttpResponse(data, status=200)

@util.api_method('GET')
def get_flavor_details(request, flavor_id):
    # Normal Response Codes: 200, 203
    # Error Response Codes: computeFault (400, 500),
    #                       serviceUnavailable (503),
    #                       unauthorized (401),
    #                       badRequest (400),
    #                       itemNotFound (404),
    #                       overLimit (413)

    flavor = util.get_flavor(flavor_id)
    flavordict = flavor_to_dict(flavor, detail=True)

    if request.serialization == 'xml':
        data = render_to_string('flavor.xml', {'flavor': flavordict})
    else:
        data = json.dumps({'flavor': flavordict})

    return HttpResponse(data, status=200)