from view_common import *
import functools

BLESSED_SITES = ["Stanford", "Washington", "Princeton", "GeorgiaTech", "MaxPlanck"]

class TenantCreateSlice(View):
    def post(self, request, *args, **kwargs):
        if request.user.isReadOnlyUser():
            return HttpResponseForbidden("User is in read-only mode")

        sliceName = request.POST.get("sliceName", "0")
        serviceClass = request.POST.get("serviceClass", "0")
        imageName = request.POST.get("imageName", "0")
        actionToDo = request.POST.get("actionToDo", "0")
        networkPorts = request.POST.get("network","0")
        mountDataSets = request.POST.get("mountDataSets","0")
        privateVolume = request.POST.get("privateVolume","0")
        if (actionToDo == "add"):
           serviceClass = ServiceClass.objects.get(name=serviceClass)
           site = request.user.site
           image = Image.objects.get(name=imageName)
           newSlice = Slice(name=sliceName,serviceClass=serviceClass,site=site,imagePreference=image,mountDataSets=mountDataSets)
           newSlice.save()
	   privateTemplate="Private"
	   publicTemplate="Public shared IPv4"
	   privateNetworkName = sliceName+"-"+privateTemplate
	   publicNetworkName = sliceName+"-"+publicTemplate
	   slice=Slice.objects.get(name=sliceName)
	   addNetwork(privateNetworkName,privateTemplate,slice)
	   addNetwork(publicNetworkName,publicTemplate,slice)
	   addOrModifyPorts(networkPorts,sliceName)
	   if privateVolume=="true":
	   	privateVolForSlice(request.user,sliceName)
        return HttpResponse("Slice created")

def privateVolForSlice(user,sliceName):
	if not hasPrivateVolume(sliceName):
	   volumeName=createPrivateVolume(user,sliceName)
	   readWrite="true"
	   mountVolume(sliceName,volumeName,readWrite)

class TenantUpdateSlice(View):
    def post(self, request, *args, **kwargs):
        if request.user.isReadOnlyUser():
            return HttpResponseForbidden("User is in read-only mode")

        sliceName = request.POST.get("sliceName", "0")
        serviceClass = request.POST.get("serviceClass", "0")
        imageName = request.POST.get("imageName", "0")
        actionToDo = request.POST.get("actionToDo", "0")
        networkPorts = request.POST.get("networkPorts","0")
        dataSet = request.POST.get("dataSet","0")
        privateVolume = request.POST.get("privateVolume","0")
        slice = Slice.objects.all()
        for entry in slice:
                serviceClass = ServiceClass.objects.get(name=serviceClass)
                if(entry.name==sliceName):
                         if (actionToDo == "update"):
                                setattr(entry,'serviceClass',serviceClass)
                                setattr(entry,'imagePreference',imageName)
                                setattr(entry,'mountDataSets',dataSet)
                                entry.save()
                                break
	addOrModifyPorts(networkPorts,sliceName)
	if privateVolume=="true":
                privateVolForSlice(request.user,sliceName)
        return HttpResponse("Slice updated")

def addNetwork(name,template,sliceName):
	networkTemplate=NetworkTemplate.objects.get(name=template)
	newNetwork = Network(name = name,
                              template = networkTemplate,
                              owner = sliceName)
        newNetwork.save()
	addNetworkSlice(newNetwork,sliceName)

def addNetworkSlice(networkSlice,sliceName):
	newNetworkSlice=NetworkSlice(network =networkSlice,
				     slice=sliceName)
	newNetworkSlice.save()

def addOrModifyPorts(networkPorts,sliceName):
	networkList = Network.objects.all()
        networkInfo = []
        if networkPorts:
           for networkEntry in networkList:
               networkSlices = networkEntry.slices.all()
               for slice in networkSlices:
                   if slice.name==sliceName:
                          if networkEntry.template.name=="Public shared IPv4":
                             setattr(networkEntry,'ports',networkPorts)
                             networkEntry.save()

def getTenantSliceInfo(user, tableFormat = False):
    tenantSliceDetails = {}
    tenantSliceData = getTenantInfo(user)
    tenantServiceClassData = getServiceClassInfo(user)
    if (tableFormat):
       tenantSliceDetails['userSliceInfo'] = userSliceTableFormatter(tenantSliceData)
       tenantSliceDetails['sliceServiceClass']=userSliceTableFormatter(tenantServiceClassData)
    else:
       tenantSliceDetails['userSliceInfo'] = tenantSliceData
    tenantSliceDetails['sliceServiceClass']=userSliceTableFormatter(tenantServiceClassData)
    tenantSliceDetails['image']=userSliceTableFormatter(getImageInfo(user))
    tenantSliceDetails['deploymentSites']=userSliceTableFormatter(getDeploymentSites())
    tenantSliceDetails['sites'] = userSliceTableFormatter(getTenantSitesInfo())
    tenantSliceDetails['mountDataSets'] = userSliceTableFormatter(getMountDataSets())
    tenantSliceDetails['publicKey'] = getPublicKey(user)
    return tenantSliceDetails

def getTenantInfo(user):
    slices =Slice.objects.all()
    userSliceInfo = []
    for entry in slices:
       sliceName = Slice.objects.get(id=entry.id).name
       slice = Slice.objects.get(name=Slice.objects.get(id=entry.id).name)
       sliceServiceClass = entry.serviceClass.name
       preferredImage =  entry.imagePreference
       #sliceDataSet = entry.mountDataSets
       sliceNetwork = {}
       numSliver = 0
       sliceImage=""
       sliceSite = {}
       sliceNode = {}
       sliceInstance= {}
       #createPrivateVolume(user,sliceName)
       for sliver in slice.slivers.all():
	    if sliver.node.site.name in BLESSED_SITES:
                sliceSite[sliver.node.site.name] = sliceSite.get(sliver.node.site.name,0) + 1
                sliceImage = sliver.image.name
                sliceNode[str(sliver)] = sliver.node.name
       numSliver = sum(sliceSite.values())
       numSites = len(sliceSite)
       userSliceInfo.append({'sliceName': sliceName,'sliceServiceClass': sliceServiceClass,'preferredImage':preferredImage,'numOfSites':numSites, 'sliceSite':sliceSite,'sliceImage':sliceImage,'numOfSlivers':numSliver,'instanceNodePair':sliceNode})
    return userSliceInfo

def getTenantSitesInfo():
	tenantSiteInfo=[]
        for entry in Site.objects.all():
            if entry.name in BLESSED_SITES:
		 tenantSiteInfo.append({'siteName':entry.name})
	return tenantSiteInfo

def getPublicKey(user):
	users=User.objects.all()
        for key in users:
        	if (str(key.email)==str(user)):
                    	sshKey = key.public_key
        return sshKey

def getServiceClassInfo(user):
    serviceClassList = ServiceClass.objects.all()
    sliceInfo = []
    for entry in serviceClassList:
          sliceInfo.append({'serviceClass':entry.name})
    return sliceInfo

def getImageInfo(user):
    imageList = Image.objects.all()
    #imageList = ['Fedora 16 LXC rev 1.3','Hadoop','MPI']
    imageInfo = []
    for imageEntry in imageList:
          imageInfo.append({'Image':imageEntry.name})
          #imageInfo.append({'Image':imageEntry})
    return imageInfo

def createPrivateVolume(user, sliceName):
    caps = Volume.CAP_READ_DATA | Volume.CAP_WRITE_DATA | Volume.CAP_HOST_DATA
    getattr(Volume.default_gateway_caps,"read data") | \
           getattr(Volume.default_gateway_caps,"write data") | \
           getattr(Volume.default_gateway_caps,"host files")
    v = Volume(name="private_" + sliceName, owner_id=user, description="private volume for %s" % sliceName, blocksize=61440, private=True, archive=False, default_gateway_caps = caps)
    v.save()
    return v

SYNDICATE_REPLICATE_PORTNUM = 1025

def get_free_port():
    inuse={}
    inuse[SYNDICATE_REPLICATE_PORTNUM] = True
    for vs in VolumeSlice.objects.all():
        inuse[vs.peer_portnum]=True
        inuse[vs.replicate_portnum]=True
    for network in Network.objects.all():
        if not network.ports:
            continue
        network_ports = [x.strip() for x in network.ports.split(",")]
        for network_port in network_ports:
            try:
                inuse[int(network_port)] = True
            except:
                # in case someone has put a malformed port number in the list
                pass
    for i in range(1025, 65535):
        if not inuse.get(i,False):
            return i
    return False

def mountVolume(sliceName, volumeName, readWrite):
    slice = Slice.objects.get(name=sliceName)
    volume = Volume.objects.get(name=volumeName)
    # choose some unused port numbers
    flags = Volume.CAP_READ_DATA
    if readWrite:
        flags = flags | Volume.CAP_WRITE_DATA
    vs = VolumeSlice(volume_id = volume, slice_id = slice, gateway_caps=flags, peer_portnum = get_free_port(), replicate_portnum = SYNDICATE_REPLICATE_PORTNUM)
    vs.save()

def hasPrivateVolume(sliceName):
     slice = Slice.objects.get(name=sliceName)
     for vs in VolumeSlice.objects.filter(slice_id=slice):
         if vs.volume_id.private:
             return True
     return False

def getMountDataSets():
        dataSetInfo=[]
        for volume in Volume.objects.all():
            if not volume.private:
                dataSetInfo.append({'DataSet': volume.name})

        return dataSetInfo

def getDeploymentSites():
    deploymentList = Deployment.objects.all()
    deploymentInfo = []
    for entry in deploymentList:
        deploymentInfo.append({'DeploymentSite':entry.name})
    return deploymentInfo

class TenantDeleteSliceView(View):
        def post(self,request):
                if request.user.isReadOnlyUser():
                    return HttpResponseForbidden("User is in read-only mode")
                sliceName = request.POST.get("sliceName",None)
                slice = Slice.objects.get(name=sliceName)
                #print slice, slice.id
                sliceToDel=Slice(name=sliceName, id=slice.id)
                sliceToDel.delete()
                return HttpResponse("Slice deleted")

class TenantAddOrRemoveSliverView(View):
    """ Add or remove slivers from a Slice

        Arguments:
            siteName - name of site. If not specified, PlanetStack will pick the
                       best site.,
            actionToDo - [add | rem]
            count - number of slivers to add or remove
            sliceName - name of slice
            noAct - if set, no changes will be made to db, but result will still
                    show which sites would have been modified.

        Returns:
            Dictionary of sites that were modified, and the count of nodes
            that were added or removed at each site.
    """
    def post(self, request, *args, **kwargs):
        siteName = request.POST.get("siteName", None)
        actionToDo = request.POST.get("actionToDo", None)
        count = int(request.POST.get("count","0"))
	sliceName = request.POST.get("slice", None)
        noAct = request.POST.get("noAct", False)

        if not sliceName:
            return HttpResponseServerError("No slice name given")

        slice = Slice.objects.get(name=sliceName)

        if siteName:
            siteList = [Site.objects.get(name=siteName)]
        else:
            siteList = None

        if (actionToDo == "add"):
            user_ip = request.GET.get("ip", get_ip(request))
            if (siteList is None):
                siteList = tenant_pick_sites(user, user_ip, slice, count)

            sitesChanged = slice_increase_slivers(request.user, user_ip, siteList, slice, count, noAct)
        elif (actionToDo == "rem"):
            sitesChanged = slice_decrease_slivers(request.user, siteList, slice, count, noAct)
        else:
            return HttpResponseServerError("Unknown actionToDo %s" % actionToDo)

        return HttpResponse(json.dumps(sitesChanged), mimetype='application/javascript')

    def get(self, request, *args, **kwargs):
        request.POST = request.GET
        return self.post(request, *args, **kwargs)  # for testing REST in browser
        #return HttpResponseServerError("GET is not supported")

class TenantPickSitesView(View):
    """ primarily just for testing purposes """
    def get(self, request, *args, **kwargs):
        count = request.GET.get("count","0")
	slice = request.GET.get("slice",None)
        if slice:
            slice = Slice.objects.get(name=slice)
        ip = request.GET.get("ip", get_ip(request))
        sites = tenant_pick_sites(request.user, user_ip=ip, count=0, slice=slice)
        sites = [x.name for x in sites]
        return HttpResponse(json.dumps(sites), mimetype='application/javascript')

def siteSortKey(site, slice=None, count=None, lat=None, lon=None):
    # try to pick a site we're already using
    has_slivers_here=False
    if slice:
        for sliver in slice.slivers.all():
            if sliver.node.site.name == site.name:
                has_slivers_here=True

    # Haversine method
    d = haversine(site.location.latitude, site.location.longitude, lat, lon)

    return (-has_slivers_here, d)

def tenant_pick_sites(user, user_ip=None, slice=None, count=None):
    """ Returns list of sites, sorted from most favorable to least favorable """
    lat=None
    lon=None
    try:
        client_geo = GeoIP().city(user_ip)
        if client_geo:
            lat=float(client_geo["latitude"])
            lon=float(client_geo["longitude"])
    except:
        print "exception in geo code"
        traceback.print_exc()

    sites = Site.objects.all()
    sites = [x for x in sites if x.name in BLESSED_SITES]
    sites = sorted(sites, key=functools.partial(siteSortKey, slice=slice, count=count, lat=lat, lon=lon))

    return sites

class TenantViewData(View):
    def get(self, request, **kwargs):
        return HttpResponse(json.dumps(getTenantSliceInfo(request.user, True)), mimetype='application/javascript')