package cluster

// ClusterStats is used to gather stats for the entire cluster
type ClusterStats struct {
	CPU struct {
		Sockets   uint32
		Cores     uint32
		Threads   uint32
		Allocated uint32
	}
	Memory struct {
		Total     uint64
		Free      uint64
		Buffers   uint64
		Cached    uint64
		Allocated uint64
	}
	Storage struct {
		Total    uint64
		Used     uint64
		Free     uint64
		Active   uint32
		Inactive uint32
		Pools    uint32

		Volumes struct {
			Total    uint32
			Active   uint32
			Inactive uint32
		}
	}
	VM struct {
		Count   uint32
		Started uint32
		Stopped uint32
	}
	Host struct {
		Count     uint32
		Available uint32
	}
	Network struct {
		Count    uint32
		Active   uint32
		Inactive uint32
	}

	old *ClusterStats
	c   *Cluster
}

// ClusterStats is used to gather stats for the entire cluster
type StatDiff struct {
	CPU struct {
		Sockets   int
		Cores     int
		Threads   int
		Allocated int
	}
	Memory struct {
		Total     int
		Free      int
		Buffers   int
		Cached    int
		Allocated int
	}
	Storage struct {
		Total    int
		Used     int
		Free     int
		Active   int
		Inactive int
		Pools    int

		Volumes struct {
			Total    int
			Active   int
			Inactive int
		}
	}
	VM struct {
		Count   int
		Started int
		Stopped int
	}
	Host struct {
		Count     int
		Available int
	}
	Network struct {
		Count    int
		Active   int
		Inactive int
	}
}

// Init is given a cluster, which it then uses to load the initial statistics
// Does not close connections, but uses the host connections available to the
// cluster to add statistics together.
func Init(c *Cluster) *ClusterStats {
	cs := &ClusterStats{}

	return cs
}

// Update triggers the stats collector to refresh it's statistics
func (cs *ClusterStats) Update() {
	cs.old = cs.copy()

	cs.reset()
	// Start looping through each host in the cluster, adding to the total
	for _, h := range cs.c.hosts {
		cs.Host.Count++
		cs.Host.Available++

		cs.CPU.Sockets += h.HostInfo.Sockets
		cs.CPU.Cores += h.HostInfo.Cores
		cs.CPU.Threads += h.HostInfo.Threads

		cs.Memory.Total += h.NodeMemory.Total
		cs.Memory.Free += h.NodeMemory.Free
		cs.Memory.Buffers += h.NodeMemory.Buffers
		cs.Memory.Cached += h.NodeMemory.Cached

		// Storage Pool counting
		cs.Storage.Pools += uint32(len(h.StoragePoolList))
		countedSharedPools := map[string]struct{}{}
		// Loop through available storage pools
		for _, sp := range h.StoragePoolList {
			if _, ok := countedSharedPools[sp.Name]; ok {
				// Already counted this shared pool, move on
				continue
			}
			if sp.HAEnabled {
				countedSharedPools[sp.Name] = struct{}{}
			}
			if !sp.Active {
				cs.Storage.Inactive++
				continue
			}
			cs.Storage.Active++
			cs.Storage.Total += sp.Capacity
			cs.Storage.Used += sp.Allocation
			cs.Storage.Free += sp.Capacity - sp.Allocation
			// Volumes in the pool
			cs.Storage.Volumes.Total += uint32(len(sp.Volumes))
			for range sp.Volumes {
				cs.Storage.Volumes.Active++
			}
		}

		// VM Count
		cs.VM.Count += uint32(len(h.VMList))
		for _, vm := range h.VMList {
			cs.CPU.Allocated += uint32(vm.VCPUs)
			cs.Memory.Allocated += uint64(vm.Memory)
			if vm.Active {
				cs.VM.Started++
				continue
			}
			cs.VM.Stopped++
		}

		// Network count
		cs.Network.Count += uint32(len(h.NetworkList))
		for _, ni := range h.NetworkList {
			if ni.Active {
				cs.Network.Active++
				continue
			}
			cs.Network.Inactive++
		}
	}
}

// Diff returns a map of all the field and how they changed
func (cs *ClusterStats) Diff() StatDiff {
	return StatDiff{
		CPU: struct {
			Sockets   int
			Cores     int
			Threads   int
			Allocated int
		}{
			Sockets:   int(cs.old.CPU.Sockets - cs.CPU.Sockets),
			Cores:     int(cs.old.CPU.Cores - cs.CPU.Cores),
			Threads:   int(cs.old.CPU.Threads - cs.CPU.Threads),
			Allocated: int(cs.old.CPU.Allocated - cs.CPU.Allocated),
		},
		Memory: struct {
			Total     int
			Free      int
			Buffers   int
			Cached    int
			Allocated int
		}{
			Total:     int(cs.old.Memory.Total - cs.Memory.Total),
			Free:      int(cs.old.Memory.Free - cs.Memory.Free),
			Buffers:   int(cs.old.Memory.Buffers - cs.Memory.Buffers),
			Cached:    int(cs.old.Memory.Cached - cs.Memory.Cached),
			Allocated: int(cs.old.Memory.Allocated - cs.Memory.Allocated),
		},
		Storage: struct {
			Total    int
			Used     int
			Free     int
			Active   int
			Inactive int
			Pools    int
			Volumes  struct {
				Total    int
				Active   int
				Inactive int
			}
		}{
			Total:    int(cs.old.Storage.Total - cs.Storage.Total),
			Used:     int(cs.old.Storage.Used - cs.Storage.Used),
			Free:     int(cs.old.Storage.Free - cs.Storage.Free),
			Active:   int(cs.old.Storage.Active - cs.Storage.Active),
			Inactive: int(cs.old.Storage.Inactive - cs.Storage.Inactive),
			Pools:    int(cs.old.Storage.Pools - cs.Storage.Pools),
			Volumes: struct {
				Total    int
				Active   int
				Inactive int
			}{
				Total:    int(cs.old.Storage.Volumes.Total - cs.Storage.Volumes.Total),
				Active:   int(cs.old.Storage.Volumes.Active - cs.Storage.Volumes.Active),
				Inactive: int(cs.old.Storage.Volumes.Inactive - cs.Storage.Volumes.Inactive),
			},
		},
		VM: struct {
			Count   int
			Started int
			Stopped int
		}{
			Count:   int(cs.old.VM.Count - cs.VM.Count),
			Started: int(cs.old.VM.Started - cs.VM.Started),
			Stopped: int(cs.old.VM.Stopped - cs.VM.Stopped),
		},
		Host: struct {
			Count     int
			Available int
		}{
			Count:     int(cs.old.Host.Count - cs.Host.Count),
			Available: int(cs.old.Host.Available - cs.Host.Available),
		},
		Network: struct {
			Count    int
			Active   int
			Inactive int
		}{
			Count:    int(cs.old.Network.Count - cs.Network.Count),
			Active:   int(cs.old.Network.Active - cs.Network.Active),
			Inactive: int(cs.old.Network.Inactive - cs.Network.Inactive),
		},
	}
}

// copy the clusterstats into a new clusterstatus object for comparison purposes
func (cs *ClusterStats) copy() *ClusterStats {
	ncs := *cs
	return &ncs
}

// reset all values to zero value
func (cs *ClusterStats) reset() {
	cs.CPU.Sockets = 0
	cs.CPU.Cores = 0
	cs.CPU.Threads = 0
	cs.CPU.Allocated = 0

	cs.Memory.Total = 0
	cs.Memory.Free = 0
	cs.Memory.Buffers = 0
	cs.Memory.Cached = 0

	cs.Storage.Total = 0
	cs.Storage.Used = 0
	cs.Storage.Free = 0
	cs.Storage.Active = 0
	cs.Storage.Inactive = 0
	cs.Storage.Pools = 0

	cs.VM.Count = 0
	cs.VM.Started = 0
	cs.VM.Stopped = 0

	cs.Host.Count = 0
	cs.Host.Available = 0

	cs.Network.Count = 0
	cs.Network.Active = 0
	cs.Network.Inactive = 0
}