package api

import (
	"fmt"
	"math"
	"strconv"
	"strings"
	"time"

	"github.com/mohae/deepcopy"
)

// Strings for VolumeSpec
const (
	Name                     = "name"
	SpecNodes                = "nodes"
	SpecParent               = "parent"
	SpecEphemeral            = "ephemeral"
	SpecShared               = "shared"
	SpecSticky               = "sticky"
	SpecSecure               = "secure"
	SpecCompressed           = "compressed"
	SpecSize                 = "size"
	SpecScale                = "scale"
	SpecFilesystem           = "fs"
	SpecBlockSize            = "block_size"
	SpecHaLevel              = "repl"
	SpecPriority             = "io_priority"
	SpecSnapshotInterval     = "snap_interval"
	SpecSnapshotSchedule     = "snap_schedule"
	SpecAggregationLevel     = "aggregation_level"
	SpecDedupe               = "dedupe"
	SpecPassphrase           = "secret_key"
	SpecAutoAggregationValue = "auto"
	SpecGroup                = "group"
	SpecGroupEnforce         = "fg"
	SpecZones                = "zones"
	SpecRacks                = "racks"
	SpecRegions              = "regions"
	SpecLabels               = "labels"
	SpecPriorityAlias        = "priority_io"
	SpecIoProfile            = "io_profile"
)

// OptionKey specifies a set of recognized query params.
const (
	// OptName query parameter used to lookup volume by name.
	OptName = "Name"
	// OptVolumeID query parameter used to lookup volume by ID.
	OptVolumeID = "VolumeID"
	// OptSnapID query parameter used to lookup snapshot by ID.
	OptSnapID = "SnapID"
	// OptLabel query parameter used to lookup volume by set of labels.
	OptLabel = "Label"
	// OptConfigLabel query parameter used to lookup volume by set of labels.
	OptConfigLabel = "ConfigLabel"
	// OptCumulative query parameter used to request cumulative stats.
	OptCumulative = "Cumulative"
)

// Api client-server Constants
const (
	OsdVolumePath   = "osd-volumes"
	OsdSnapshotPath = "osd-snapshot"
	TimeLayout      = "Jan 2 15:04:05 UTC 2006"
)

const (
	// AutoAggregation value indicates driver to select aggregation level.
	AutoAggregation = math.MaxUint32
)

// Node describes the state of a node.
// It includes the current physical state (CPU, memory, storage, network usage) as
// well as the containers running on the system.
type Node struct {
	Id        string
	Cpu       float64 // percentage.
	MemTotal  uint64
	MemUsed   uint64
	MemFree   uint64
	Avgload   int
	Status    Status
	GenNumber uint64
	Disks     map[string]StorageResource
	Pools     []StoragePool
	MgmtIp    string
	DataIp    string
	Timestamp time.Time
	StartTime time.Time
	Hostname  string
	NodeData  map[string]interface{}
	// User defined labels for node. Key Value pairs
	NodeLabels map[string]string
}

type FluentDConfig struct {
	IP   string `json:"ip"`
	Port string `json:"port"`
}

type TunnelConfig struct {
	Key      string `json:"key"`
	Cert     string `json:"cert"`
	Endpoint string `json:"tunnel_endpoint"`
}

// Cluster represents the state of the cluster.
type Cluster struct {
	Status Status

	// Id is the ID of the cluster.
	Id string

	// NodeId is the ID of the node on which this cluster object
	// is initialized
	NodeId string

	// Nodes is an array of all the nodes in the cluster.
	Nodes []Node

	// Logging url for the cluster.
	LoggingURL string

	// Management url for the cluster
	ManagementURL string

	// FluentD Host for the cluster
	FluentDConfig FluentDConfig

	// TunnelConfig for the cluster [key, cert, endpoint]
	TunnelConfig TunnelConfig
}

// StatPoint represents the basic structure of a single Stat reported
// TODO: This is the first step to introduce stats in openstorage.
//       Follow up task is to introduce an API for logging stats
type StatPoint struct {
	// Name of the Stat
	Name string
	// Tags for the Stat
	Tags map[string]string
	// Fields and values of the stat
	Fields map[string]interface{}
	// Timestamp in Unix format
	Timestamp int64
}

// DriverTypeSimpleValueOf returns the string format of DriverType
func DriverTypeSimpleValueOf(s string) (DriverType, error) {
	obj, err := simpleValueOf("driver_type", DriverType_value, s)
	return DriverType(obj), err
}

// SimpleString returns the string format of DriverType
func (x DriverType) SimpleString() string {
	return simpleString("driver_type", DriverType_name, int32(x))
}

// FSTypeSimpleValueOf returns the string format of FSType
func FSTypeSimpleValueOf(s string) (FSType, error) {
	obj, err := simpleValueOf("fs_type", FSType_value, s)
	return FSType(obj), err
}

// SimpleString returns the string format of DriverType
func (x FSType) SimpleString() string {
	return simpleString("fs_type", FSType_name, int32(x))
}

// CosTypeSimpleValueOf returns the string format of CosType
func CosTypeSimpleValueOf(s string) (CosType, error) {
	obj, exists := CosType_value[strings.ToUpper(s)]
	if !exists {
		return -1, fmt.Errorf("Invalid cos value: %s", s)
	}
	return CosType(obj), nil
}

// SimpleString returns the string format of CosType
func (x CosType) SimpleString() string {
	return simpleString("cos_type", CosType_name, int32(x))
}

// GraphDriverChangeTypeSimpleValueOf returns the string format of GraphDriverChangeType
func GraphDriverChangeTypeSimpleValueOf(s string) (GraphDriverChangeType, error) {
	obj, err := simpleValueOf("graph_driver_change_type", GraphDriverChangeType_value, s)
	return GraphDriverChangeType(obj), err
}

// SimpleString returns the string format of GraphDriverChangeType
func (x GraphDriverChangeType) SimpleString() string {
	return simpleString("graph_driver_change_type", GraphDriverChangeType_name, int32(x))
}

// VolumeActionParamSimpleValueOf returns the string format of VolumeAction
func VolumeActionParamSimpleValueOf(s string) (VolumeActionParam, error) {
	obj, err := simpleValueOf("volume_action_param", VolumeActionParam_value, s)
	return VolumeActionParam(obj), err
}

// SimpleString returns the string format of VolumeAction
func (x VolumeActionParam) SimpleString() string {
	return simpleString("volume_action_param", VolumeActionParam_name, int32(x))
}

// VolumeStateSimpleValueOf returns the string format of VolumeState
func VolumeStateSimpleValueOf(s string) (VolumeState, error) {
	obj, err := simpleValueOf("volume_state", VolumeState_value, s)
	return VolumeState(obj), err
}

// SimpleString returns the string format of VolumeState
func (x VolumeState) SimpleString() string {
	return simpleString("volume_state", VolumeState_name, int32(x))
}

// VolumeStatusSimpleValueOf returns the string format of VolumeStatus
func VolumeStatusSimpleValueOf(s string) (VolumeStatus, error) {
	obj, err := simpleValueOf("volume_status", VolumeStatus_value, s)
	return VolumeStatus(obj), err
}

// SimpleString returns the string format of VolumeStatus
func (x VolumeStatus) SimpleString() string {
	return simpleString("volume_status", VolumeStatus_name, int32(x))
}

// IoProfileSimpleValueOf returns the string format of IoProfile
func IoProfileSimpleValueOf(s string) (IoProfile, error) {
	obj, err := simpleValueOf("io_profile", IoProfile_value, s)
	return IoProfile(obj), err
}

// SimpleString returns the string format of IoProfile
func (x IoProfile) SimpleString() string {
	return simpleString("io_profile", IoProfile_name, int32(x))
}

func simpleValueOf(typeString string, valueMap map[string]int32, s string) (int32, error) {
	obj, ok := valueMap[strings.ToUpper(fmt.Sprintf("%s_%s", typeString, s))]
	if !ok {
		return 0, fmt.Errorf("no openstorage.%s for %s", strings.ToUpper(typeString), s)
	}
	return obj, nil
}

func simpleString(typeString string, nameMap map[int32]string, v int32) string {
	s, ok := nameMap[v]
	if !ok {
		return strconv.Itoa(int(v))
	}
	return strings.TrimPrefix(strings.ToLower(s), fmt.Sprintf("%s_", strings.ToLower(typeString)))
}

func toSec(ms uint64) uint64 {
	return ms / 1000
}

// WriteThroughput returns the write throughput
func (v *Stats) WriteThroughput() uint64 {
	if v.IntervalMs == 0 {
		return 0
	}
	return (v.WriteBytes) / toSec(v.IntervalMs)
}

// ReadThroughput returns the read throughput
func (v *Stats) ReadThroughput() uint64 {
	if v.IntervalMs == 0 {
		return 0
	}
	return (v.ReadBytes) / toSec(v.IntervalMs)
}

// Latency returns latency
func (v *Stats) Latency() uint64 {
	ops := v.Writes + v.Reads
	if ops == 0 {
		return 0
	}
	return (uint64)((v.IoMs * 1000) / ops)
}

// Read latency returns avg. time required for read operation to complete
func (v *Stats) ReadLatency() uint64 {
	if v.Reads == 0 {
		return 0
	}
	return (uint64)((v.ReadMs * 1000) / v.Reads)
}

// Write latency returns avg. time required for write operation to complete
func (v *Stats) WriteLatency() uint64 {
	if v.Writes == 0 {
		return 0
	}
	return (uint64)((v.WriteMs * 1000) / v.Writes)
}

// Iops returns iops
func (v *Stats) Iops() uint64 {
	if v.IntervalMs == 0 {
		return 0
	}
	return (v.Writes + v.Reads) / toSec(v.IntervalMs)
}

// Scaled returns true if the volume is scaled.
func (v *Volume) Scaled() bool {
	return v.Spec.Scale > 1
}

// Contains returns true if mid is a member of volume's replication set.
func (m *Volume) Contains(mid string) bool {
	rsets := m.GetReplicaSets()
	for _, rset := range rsets {
		for _, node := range rset.Nodes {
			if node == mid {
				return true
			}
		}
	}
	return false
}

// Copy makes a deep copy of VolumeSpec
func (s *VolumeSpec) Copy() *VolumeSpec {
	spec := *s
	if s.VolumeLabels != nil {
		spec.VolumeLabels = make(map[string]string)
		for k, v := range s.VolumeLabels {
			spec.VolumeLabels[k] = v
		}
	}
	if s.ReplicaSet != nil {
		spec.ReplicaSet = &ReplicaSet{Nodes: make([]string, len(s.ReplicaSet.Nodes))}
		copy(spec.ReplicaSet.Nodes, s.ReplicaSet.Nodes)
	}
	return &spec
}

// Copy makes a deep copy of Node
func (s *Node) Copy() *Node {
	localCopy := deepcopy.Copy(*s)
	nodeCopy := localCopy.(Node)
	return &nodeCopy
}

func (v Volume) IsClone() bool {
	return v.Source != nil && len(v.Source.Parent) != 0 && !v.Readonly
}

func (v Volume) IsSnapshot() bool {
	return v.Source != nil && len(v.Source.Parent) != 0 && v.Readonly
}

func (v Volume) DisplayId() string {
	if v.Locator != nil {
		return fmt.Sprintf("%s (%s)", v.Locator.Name, v.Id)
	} else {
		return v.Id
	}
	return ""
}