package devices

import (
	"context"
	"strings"

	"xiaomihome/miot"
	"xiaomihome/xiaomi"
)

// valMapper maps between device raw values and semantic names. Built from SPEC ValueList.
// Different brands assign different raw values for the same mode name,
// so this must be per-device. Names are lowercased from SPEC description for consistency.
type valMapper struct {
	val2name map[int]string
	name2val map[string]int
	names    []string
}

func newValMapper(vl miot.MIoTSpecValueList) *valMapper {
	vm := &valMapper{
		val2name: make(map[int]string),
		name2val: make(map[string]int),
	}
	for _, item := range vl {
		v := toInt(item.Value)
		display := item.Desc
		if display == "" {
			display = item.Name
		}
		key := strings.ToLower(display)
		vm.val2name[v] = display     // 原始描述做展示
		vm.name2val[key] = v         // 小写 key 做匹配
		vm.names = append(vm.names, display)
	}
	return vm
}

func (vm *valMapper) name(v int) string {
	if vm == nil { return "" }
	return vm.val2name[v]
}

func (vm *valMapper) val(name string) (int, bool) {
	if vm == nil { return 0, false }
	v, ok := vm.name2val[strings.ToLower(name)]
	return v, ok
}

func (vm *valMapper) allNames() []string {
	if vm == nil { return nil }
	return vm.names
}

// ========== 空调模式/风速/摆风常量 ==========

const (
	ACModeCool = "cool"
	ACModeHeat = "heat"
	ACModeFan  = "fan"
	ACModeDry  = "dry"
	ACModeAuto = "auto"

	ACFanLow    = "low"
	ACFanMedium = "medium"
	ACFanHigh   = "high"
	ACFanAuto   = "auto"

	ACSwingOff        = "off"
	ACSwingVertical   = "vertical"
	ACSwingHorizontal = "horizontal"
	ACSwingBoth       = "both"
)

// ========== AirConditioner 接口 ==========

// AirConditioner 空调统一控制接口
type AirConditioner interface {
	Device
	TurnOn(ctx context.Context) error
	TurnOff(ctx context.Context) error
	IsOn(ctx context.Context) (bool, error)

	// 能力查询
	HasFanSpeed() bool
	HasSwing() bool
	HasHumidity() bool
	HasAuxHeat() bool
	HasEco() bool

	// 模式控制
	SetMode(ctx context.Context, mode string) error
	GetMode(ctx context.Context) (string, error)

	// 温度控制
	SetTargetTemp(ctx context.Context, celsius float64) error
	GetTargetTemp(ctx context.Context) (float64, error)
	GetCurrentTemp(ctx context.Context) (float64, error) // 室内温度

	// 风速控制
	SetFanSpeed(ctx context.Context, speed string) error
	GetFanSpeed(ctx context.Context) (string, error)

	// 摆风控制
	SetSwing(ctx context.Context, mode string) error
	GetSwing(ctx context.Context) (string, error)

	// 湿度
	SetTargetHumidity(ctx context.Context, pct int) error
	GetTargetHumidity(ctx context.Context) (int, error)
	GetCurrentHumidity(ctx context.Context) (int, error)

	// 电辅热
	SetAuxHeat(ctx context.Context, on bool) error
	GetAuxHeat(ctx context.Context) (bool, error)

	// 节能
	SetEco(ctx context.Context, on bool) error
	GetEco(ctx context.Context) (bool, error)

	// 功率
	HasPower() bool
	GetElectricPower(ctx context.Context) (float64, error) // 当前电功率（W）
	GetPowerConsumption(ctx context.Context) (float64, error) // 累计耗电量（kWh）

	// 订阅
	OnPropsChanged(handler func(props ACProps, changed string)) (string, error)
	GetProps() ACProps
	FetchProps(ctx context.Context) (ACProps, error)
}

// ACProps 空调完整状态（字段名对齐 SPEC type）
type ACProps struct {
	On               bool    `json:"on"`
	Mode             string  `json:"mode"`             // SPEC ValueList 解析后的名称：cool/heat/fan/dry/auto
	TargetTemperature float64 `json:"targetTemperature"`
	Temperature       float64 `json:"temperature"`
	TargetHumidity   int     `json:"targetHumidity"`
	CurrentHumidity  int     `json:"currentHumidity"`
	FanLevel         string  `json:"fanLevel"`         // SPEC ValueList 解析后的名称：low/medium/high/auto
	Swing            string  `json:"swing"`            // SPEC ValueList 解析后的名称：off/vertical/horizontal/both
	AuxHeat          bool    `json:"auxHeat"`
	Eco              bool    `json:"eco"`
	ElectricPower    float64 `json:"electricPower"`    // 当前电功率（W），来自 electric-power
	PowerConsumption float64 `json:"powerConsumption"` // 累计耗电量（kWh），来自 power-consumption
}

type acDevice struct {
	BaseDevice
	propOn              siidPiid // "on"
	propMode            siidPiid // "mode"
	propTargetTemp      siidPiid // "target-temperature"
	propCurrentTemp     siidPiid // "temperature"
	propFanSpeed        siidPiid // "fan-level"
	propSwing           siidPiid // "swing-mode" or "horizontal-swing" or "vertical-swing"
	propTargetHumidity  siidPiid // "target-humidity"
	propCurrentHumidity siidPiid // "relative-humidity"
	propAuxHeat         siidPiid // "aux-heat" or "heater"
	propEco             siidPiid // "eco"
	propElectricPower   siidPiid // "electric-power"
	propPowerConsumption siidPiid // "power-consumption"

	modeMap *valMapper // SPEC value→name for mode
	fanMap  *valMapper // SPEC value→name for fan-level
	swingMap *valMapper // SPEC value→name for swing

	propsCache ACProps // MQTT 推送维护的本地缓存
}

// NewAirConditioner creates an AirConditioner control for the given device.
func NewAirConditioner(client *xiaomi.Client, info *xiaomi.DeviceInfo) (AirConditioner, error) {
	d := &acDevice{
		BaseDevice: NewBaseDevice(client, info),
	}

	dev := d.getMIoTDevice()
	if dev == nil {
		return nil, xiaomi.ErrNoSPEC
	}
	spec := dev.SpecInstance()
	if spec == nil {
		return nil, xiaomi.ErrNoSPEC
	}

	resolver := d.getSpecResolver()
	if resolver == nil {
		return nil, xiaomi.ErrNoSPEC
	}

	// Helper: find property ValueList from spec by type name
	findValList := func(propType string) miot.MIoTSpecValueList {
		for _, svc := range spec.Services {
			for _, p := range svc.Properties {
				if propertyShortName(p.Type) == propType {
					return p.ValueList
				}
			}
		}
		return nil
	}

	// "on" is required
	siid, piid, ok := resolver.find("on")
	if !ok {
		return nil, xiaomi.ErrNotSupported
	}
	d.propOn = siidPiid{siid, piid, true}

	// Optional properties — each independently resolved
	if s, p, ok := resolver.find("mode"); ok {
		d.propMode = siidPiid{s, p, true}
		d.modeMap = newValMapper(findValList("mode"))
	}
	if s, p, ok := resolver.find("target-temperature"); ok {
		d.propTargetTemp = siidPiid{s, p, true}
	}
	if s, p, ok := resolver.find("temperature"); ok {
		d.propCurrentTemp = siidPiid{s, p, true}
	}
	if s, p, ok := resolver.find("fan-level"); ok {
		d.propFanSpeed = siidPiid{s, p, true}
		d.fanMap = newValMapper(findValList("fan-level"))
	}
	// Try multiple swing mode type names
	if s, p, ok := resolver.find("swing-mode"); ok {
		d.propSwing = siidPiid{s, p, true}
		d.swingMap = newValMapper(findValList("swing-mode"))
	} else if s, p, ok := resolver.find("horizontal-swing"); ok {
		d.propSwing = siidPiid{s, p, true}
		d.swingMap = newValMapper(findValList("horizontal-swing"))
	} else if s, p, ok := resolver.find("vertical-swing"); ok {
		d.propSwing = siidPiid{s, p, true}
		d.swingMap = newValMapper(findValList("vertical-swing"))
	}
	if s, p, ok := resolver.find("target-humidity"); ok {
		d.propTargetHumidity = siidPiid{s, p, true}
	}
	if s, p, ok := resolver.find("relative-humidity"); ok {
		d.propCurrentHumidity = siidPiid{s, p, true}
	}
	if s, p, ok := resolver.find("heater"); ok {
		d.propAuxHeat = siidPiid{s, p, true}
	} else if s, p, ok := resolver.find("aux-heat"); ok {
		d.propAuxHeat = siidPiid{s, p, true}
	}
	if s, p, ok := resolver.find("eco"); ok {
		d.propEco = siidPiid{s, p, true}
	}
	if s, p, ok := resolver.find("electric-power"); ok {
		d.propElectricPower = siidPiid{s, p, true}
	}
	if s, p, ok := resolver.find("power-consumption"); ok {
		d.propPowerConsumption = siidPiid{s, p, true}
	}

	return d, nil
}

func (d *acDevice) TurnOn(ctx context.Context) error {
	if !d.propOn.valid {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propOn.siid, d.propOn.piid, true)
}

func (d *acDevice) TurnOff(ctx context.Context) error {
	if !d.propOn.valid {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propOn.siid, d.propOn.piid, false)
}

func (d *acDevice) IsOn(ctx context.Context) (bool, error) {
	if !d.propOn.valid {
		return false, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propOn.siid, d.propOn.piid)
	if err != nil {
		return false, err
	}
	if b, ok := prop.Value.(bool); ok {
		return b, nil
	}
	return false, nil
}

func (d *acDevice) HasFanSpeed() bool { return d.propFanSpeed.valid }
func (d *acDevice) HasSwing() bool    { return d.propSwing.valid }
func (d *acDevice) HasHumidity() bool { return d.propTargetHumidity.valid }
func (d *acDevice) HasAuxHeat() bool  { return d.propAuxHeat.valid }
func (d *acDevice) HasEco() bool      { return d.propEco.valid }
func (d *acDevice) HasPower() bool    { return d.propElectricPower.valid || d.propPowerConsumption.valid }

func (d *acDevice) SetMode(ctx context.Context, mode string) error {
	if !d.propMode.valid {
		return xiaomi.ErrNotSupported
	}
	v, ok := d.modeMap.val(mode)
	if !ok {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propMode.siid, d.propMode.piid, v)
}

func (d *acDevice) GetMode(ctx context.Context) (string, error) {
	if !d.propMode.valid {
		return ACModeAuto, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propMode.siid, d.propMode.piid)
	if err != nil {
		return ACModeAuto, err
	}
	return d.modeMap.name(toInt(prop.Value)), nil
}

func (d *acDevice) SetTargetTemp(ctx context.Context, celsius float64) error {
	if !d.propTargetTemp.valid {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propTargetTemp.siid, d.propTargetTemp.piid, celsius)
}

func (d *acDevice) GetTargetTemp(ctx context.Context) (float64, error) {
	if !d.propTargetTemp.valid {
		return 0, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propTargetTemp.siid, d.propTargetTemp.piid)
	if err != nil {
		return 0, err
	}
	return toFloat(prop.Value), nil
}

func (d *acDevice) GetCurrentTemp(ctx context.Context) (float64, error) {
	if !d.propCurrentTemp.valid {
		return 0, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propCurrentTemp.siid, d.propCurrentTemp.piid)
	if err != nil {
		return 0, err
	}
	return toFloat(prop.Value), nil
}

func (d *acDevice) SetFanSpeed(ctx context.Context, speed string) error {
	if !d.propFanSpeed.valid {
		return xiaomi.ErrNotSupported
	}
	v, ok := d.fanMap.val(speed)
	if !ok {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propFanSpeed.siid, d.propFanSpeed.piid, v)
}

func (d *acDevice) GetFanSpeed(ctx context.Context) (string, error) {
	if !d.propFanSpeed.valid {
		return ACFanAuto, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propFanSpeed.siid, d.propFanSpeed.piid)
	if err != nil {
		return ACFanAuto, err
	}
	return d.fanMap.name(toInt(prop.Value)), nil
}

func (d *acDevice) SetSwing(ctx context.Context, mode string) error {
	if !d.propSwing.valid {
		return xiaomi.ErrNotSupported
	}
	v, ok := d.swingMap.val(mode)
	if !ok {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propSwing.siid, d.propSwing.piid, v)
}

func (d *acDevice) GetSwing(ctx context.Context) (string, error) {
	if !d.propSwing.valid {
		return ACSwingOff, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propSwing.siid, d.propSwing.piid)
	if err != nil {
		return ACSwingOff, err
	}
	return d.swingMap.name(toInt(prop.Value)), nil
}

func (d *acDevice) SetTargetHumidity(ctx context.Context, pct int) error {
	if !d.propTargetHumidity.valid {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propTargetHumidity.siid, d.propTargetHumidity.piid, pct)
}

func (d *acDevice) GetTargetHumidity(ctx context.Context) (int, error) {
	if !d.propTargetHumidity.valid {
		return 0, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propTargetHumidity.siid, d.propTargetHumidity.piid)
	if err != nil {
		return 0, err
	}
	return toInt(prop.Value), nil
}

func (d *acDevice) GetCurrentHumidity(ctx context.Context) (int, error) {
	if !d.propCurrentHumidity.valid {
		return 0, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propCurrentHumidity.siid, d.propCurrentHumidity.piid)
	if err != nil {
		return 0, err
	}
	return toInt(prop.Value), nil
}

func (d *acDevice) SetAuxHeat(ctx context.Context, on bool) error {
	if !d.propAuxHeat.valid {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propAuxHeat.siid, d.propAuxHeat.piid, on)
}

func (d *acDevice) GetAuxHeat(ctx context.Context) (bool, error) {
	if !d.propAuxHeat.valid {
		return false, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propAuxHeat.siid, d.propAuxHeat.piid)
	if err != nil {
		return false, err
	}
	if b, ok := prop.Value.(bool); ok {
		return b, nil
	}
	return false, nil
}

func (d *acDevice) SetEco(ctx context.Context, on bool) error {
	if !d.propEco.valid {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propEco.siid, d.propEco.piid, on)
}

func (d *acDevice) GetEco(ctx context.Context) (bool, error) {
	if !d.propEco.valid {
		return false, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propEco.siid, d.propEco.piid)
	if err != nil {
		return false, err
	}
	if b, ok := prop.Value.(bool); ok {
		return b, nil
	}
	return false, nil
}

func (d *acDevice) GetElectricPower(ctx context.Context) (float64, error) {
	if !d.propElectricPower.valid {
		return 0, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propElectricPower.siid, d.propElectricPower.piid)
	if err != nil {
		return 0, err
	}
	return toFloat(prop.Value), nil
}

func (d *acDevice) GetPowerConsumption(ctx context.Context) (float64, error) {
	if !d.propPowerConsumption.valid {
		return 0, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propPowerConsumption.siid, d.propPowerConsumption.piid)
	if err != nil {
		return 0, err
	}
	return toFloat(prop.Value), nil
}

// propField maps a SPEC short name to a siid/piid pair and a cache-update function.
type propField struct {
	siid, piid int
	name       string
	fill       func(*ACProps, interface{})
	valType    byte // 'b'=bool, 'i'=int, 'f'=float, 's'=string
}

func (d *acDevice) OnPropsChanged(handler func(props ACProps, changed string)) (string, error) {
	fields := d.propFields()
	if len(fields) == 0 {
		return "", xiaomi.ErrNotSupported
	}
	// 每个属性精确订阅 siid/piid，避免 lumi.acpartner.mcn02 等设备
	// siid/piid 冲突时把风速 int 路由到 on 槽位
	var firstID string
	for i, f := range fields {
		idx := i
		subID, err := d.SubProp(f.siid, f.piid, func(did string, prop *xiaomi.PropertyValue) {
			// lumi.acpartner.mcn02 固件 bug：on 通道会收到 int 值，静默丢弃
			switch f.valType {
			case 'b':
				if _, ok := prop.Value.(bool); !ok {
					return
				}
			case 's':
				if _, ok := prop.Value.(string); !ok {
					return
				}
			}
			fields[idx].fill(&d.propsCache, prop.Value)
			handler(d.propsCache, f.name)
		})
		if err != nil {
			return "", err
		}
		if firstID == "" {
			firstID = subID
		}
	}
	return firstID, nil
}

func (d *acDevice) propFields() []propField {
	r := d.getSpecResolver()
	var fields []propField
	add := func(sp siidPiid, name string, specType string, fill func(*ACProps, interface{})) {
		if sp.valid {
			vt := byte(0)
			switch specType {
			case "bool":
				vt = 'b'
			case "uint8", "uint16", "uint32", "int8", "int16", "int32":
				vt = 'i'
			case "float":
				vt = 'f'
			case "string":
				vt = 's'
			}
			fields = append(fields, propField{sp.siid, sp.piid, name, fill, vt})
		}
	}
	add(d.propOn, "on", specFormat(r, "on"), func(s *ACProps, v interface{}) { s.On, _ = v.(bool) })
	add(d.propMode, "mode", specFormat(r, "mode"), func(s *ACProps, v interface{}) {
		s.Mode = d.modeMap.name(toInt(v))
	})
	add(d.propTargetTemp, "target-temperature", specFormat(r, "target-temperature"), func(s *ACProps, v interface{}) { s.TargetTemperature = toFloat(v) })
	add(d.propCurrentTemp, "temperature", specFormat(r, "temperature"), func(s *ACProps, v interface{}) { s.Temperature = toFloat(v) })
	add(d.propFanSpeed, "fan-level", specFormat(r, "fan-level"), func(s *ACProps, v interface{}) {
		s.FanLevel = d.fanMap.name(toInt(v))
	})
	add(d.propSwing, "swing", specFormat(r, "swing-mode"), func(s *ACProps, v interface{}) {
		s.Swing = d.swingMap.name(toInt(v))
	})
	add(d.propTargetHumidity, "target-humidity", specFormat(r, "target-humidity"), func(s *ACProps, v interface{}) { s.TargetHumidity = int(toFloat(v)) })
	add(d.propCurrentHumidity, "relative-humidity", specFormat(r, "relative-humidity"), func(s *ACProps, v interface{}) { s.CurrentHumidity = int(toFloat(v)) })
	add(d.propAuxHeat, "heater", specFormat(r, "heater"), func(s *ACProps, v interface{}) { s.AuxHeat, _ = v.(bool) })
	add(d.propEco, "eco", specFormat(r, "eco"), func(s *ACProps, v interface{}) { s.Eco, _ = v.(bool) })
	add(d.propElectricPower, "electric-power", specFormat(r, "electric-power"), func(s *ACProps, v interface{}) { s.ElectricPower = toFloat(v) })
	add(d.propPowerConsumption, "power-consumption", specFormat(r, "power-consumption"), func(s *ACProps, v interface{}) { s.PowerConsumption = toFloat(v) })
	return fields
}

func specFormat(r *specResolver, propType string) string {
	if r == nil {
		return ""
	}
	return r.format(propType)
}

// toFloat converts an interface{} to float64.
func toFloat(v interface{}) float64 {
	switch n := v.(type) {
	case float64:
		return n
	case float32:
		return float64(n)
	case int:
		return float64(n)
	case int64:
		return float64(n)
	}
	return 0
}

// toBool converts an interface{} to bool. 支持 bool 及数值（0/1）类型。
func toBool(v interface{}) bool {
	switch n := v.(type) {
	case bool:
		return n
	case float64:
		return n != 0
	case float32:
		return n != 0
	case int:
		return n != 0
	case int64:
		return n != 0
	}
	return false
}

func (d *acDevice) GetProps() ACProps { return d.propsCache }

func (d *acDevice) FetchProps(ctx context.Context) (ACProps, error) {
	fields := d.propFields()
	keys := make([]xiaomi.PropKey, len(fields))
	for i, f := range fields {
		keys[i] = xiaomi.PropKey{DID: d.info.DID, SIID: f.siid, PIID: f.piid}
	}
	props, err := d.client.GetProps(ctx, keys)
	if err != nil {
		return d.propsCache, err
	}
	result := ACProps{}
	for _, p := range props {
		for _, f := range fields {
			if f.siid == p.SIID && f.piid == p.PIID {
				f.fill(&result, p.Value)
				break
			}
		}
	}
	d.propsCache = result
	return result, nil
}