package topology

import (
	"code.google.com/p/weed-fs/go/storage"
	"encoding/json"
	"fmt"
	"math/rand"
	"testing"
	"time"
)

var topologyLayout = `
{
	"dc1":{
		"rack1":{
			"server1":{
				"volumes":[
					{"id":1, "size":12312},
					{"id":2, "size":12312},
					{"id":3, "size":12312}
				],
				"limit":3
			},
			"server2":{
				"volumes":[
					{"id":4, "size":12312},
					{"id":5, "size":12312},
					{"id":6, "size":12312}
				],
				"limit":10
			}
		},
		"rack2":{
			"server1":{
				"volumes":[
					{"id":4, "size":12312},
					{"id":5, "size":12312},
					{"id":6, "size":12312}
				],
				"limit":4
			},
			"server2":{
				"volumes":[],
				"limit":4
			},
			"server3":{
				"volumes":[
					{"id":2, "size":12312},
					{"id":3, "size":12312},
					{"id":4, "size":12312}
				],
				"limit":2
			}
		}
	},
	"dc2":{
	},
	"dc3":{
		"rack2":{
			"server1":{
				"volumes":[
					{"id":1, "size":12312},
					{"id":3, "size":12312},
					{"id":5, "size":12312}
				],
				"limit":4
			}
		}
	}
}
`

func setup(topologyLayout string) *Topology {
	var data interface{}
	err := json.Unmarshal([]byte(topologyLayout), &data)
	if err != nil {
		fmt.Println("error:", err)
	}

	//need to connect all nodes first before server adding volumes
	topo, err := NewTopology("mynetwork", "/etc/weed.conf", "/tmp", "test", 234, 5)
	if err != nil {
		fmt.Println("error:", err)
	}
	mTopology := data.(map[string]interface{})
	for dcKey, dcValue := range mTopology {
		dc := NewDataCenter(dcKey)
		dcMap := dcValue.(map[string]interface{})
		topo.LinkChildNode(dc)
		for rackKey, rackValue := range dcMap {
			rack := NewRack(rackKey)
			rackMap := rackValue.(map[string]interface{})
			dc.LinkChildNode(rack)
			for serverKey, serverValue := range rackMap {
				server := NewDataNode(serverKey)
				serverMap := serverValue.(map[string]interface{})
				rack.LinkChildNode(server)
				for _, v := range serverMap["volumes"].([]interface{}) {
					m := v.(map[string]interface{})
					vi := storage.VolumeInfo{
						Id:      storage.VolumeId(int64(m["id"].(float64))),
						Size:    uint64(m["size"].(float64)),
						Version: storage.CurrentVersion}
					server.AddOrUpdateVolume(vi)
				}
				server.UpAdjustMaxVolumeCountDelta(int(serverMap["limit"].(float64)))
			}
		}
	}

	return topo
}

func TestRemoveDataCenter(t *testing.T) {
	topo := setup(topologyLayout)
	topo.UnlinkChildNode(NodeId("dc2"))
	if topo.GetActiveVolumeCount() != 15 {
		t.Fail()
	}
	topo.UnlinkChildNode(NodeId("dc3"))
	if topo.GetActiveVolumeCount() != 12 {
		t.Fail()
	}
}

func TestReserveOneVolume(t *testing.T) {
	topo := setup(topologyLayout)
	rand.Seed(time.Now().UnixNano())
	rand.Seed(1)
	ret, node, vid := topo.RandomlyReserveOneVolume()
	fmt.Println("assigned :", ret, ", node :", node, ", volume id:", vid)

}