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# Copyright 2011 GRNET S.A. All rights reserved.
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# 
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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# 
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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# 
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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# 
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# 
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from datetime import datetime
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from logging import getLogger
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from django.conf import settings
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from django.http import HttpResponse
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from django.template.loader import render_to_string
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from django.utils import simplejson as json
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from synnefo.api.util import api_method, isoformat
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log = getLogger('synnefo.api')
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VERSION_1_1 = {
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    'id': 'v1.1',
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    'status': 'CURRENT',
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    'updated': '2011-04-01',
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    'links': [
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        {
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            'rel': 'self',
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            'href': settings.API_ROOT_URL,
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        }
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    ]
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}
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VERSIONS = [VERSION_1_1]
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MEDIA_TYPES = [
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    {'base': 'application/xml', 'type': 'application/vnd.openstack.compute-v1.1+xml'},
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    {'base': 'application/json', 'type': 'application/vnd.openstack.compute-v1.1+json'}
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]
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DESCRIBED_BY = [
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    {
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        'rel' : 'describedby',
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        'type' : 'application/pdf',
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        'href' : 'http://docs.rackspacecloud.com/servers/api/v1.1/cs-devguide-20110125.pdf'
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    },
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    {
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        'rel' : 'describedby',
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        'type' : 'application/vnd.sun.wadl+xml',
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        'href' : 'http://docs.rackspacecloud.com/servers/api/v1.1/application.wadl'
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    }
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]
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@api_method('GET', atom_allowed=True)
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def versions_list(request):
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    # Normal Response Codes: 200, 203
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    # Error Response Codes: 400, 413, 500, 503
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    if request.serialization == 'xml':
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        data = render_to_string('versions_list.xml', {'versions': VERSIONS})
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    elif request.serialization == 'atom':
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        now = isoformat(datetime.now())
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        data = render_to_string('versions_list.atom', {'now': now,'versions': VERSIONS})
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    else:
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        data = json.dumps({'versions': {'values': VERSIONS}})
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    return HttpResponse(data)
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@api_method('GET', atom_allowed=True)
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def version_details(request, api_version):
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    # Normal Response Codes: 200, 203
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    # Error Response Codes: computeFault (400, 500),
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    #                       serviceUnavailable (503),
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    #                       unauthorized (401),
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    #                       badRequest (400),
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    #                       overLimit(413)
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    log.debug('version_details %s', api_version)
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    # We hardcode to v1.1 since it is the only one we support
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    version = VERSION_1_1.copy()
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    version['links'] = version['links'] + DESCRIBED_BY
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    if request.serialization == 'xml':
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        version['media_types'] = MEDIA_TYPES
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        data = render_to_string('version_details.xml', {'version': version})
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    elif request.serialization == 'atom':
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        version['media_types'] = MEDIA_TYPES
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        now = isoformat(datetime.now())
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        data = render_to_string('version_details.atom', {'now': now,'version': version})
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    else:
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        version['media-types'] = MEDIA_TYPES
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        data = json.dumps({'version': version})
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    return HttpResponse(data)