package devices

import (
	"context"
	"git.zeroonesoft.cn/golib/xiaomihome/xiaomi"
)

// Vacuum 扫地机统一控制接口
type Vacuum interface {
	Device
	Start(ctx context.Context) error
	Stop(ctx context.Context) error
	ReturnToDock(ctx context.Context) error
	SetFanLevel(ctx context.Context, level int) error
	GetFanLevel(ctx context.Context) (int, error)
	GetStatus(ctx context.Context) (VacuumProps, error)

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

// VacuumProps 扫地机运行状态（字段名对齐 SPEC type）
type VacuumProps struct {
	On       bool `json:"on"`
	Mode     int  `json:"mode"`
	FanLevel int  `json:"fanLevel"`
	Battery  int  `json:"battery"`
}

type vacuumDevice struct {
	BaseDevice
	propOn       siidPiid
	propMode     siidPiid
	propFanLevel siidPiid
	propBattery  siidPiid
	propsCache   VacuumProps
}

func NewVacuum(client *xiaomi.Client, info *xiaomi.DeviceInfo) (Vacuum, error) {
	d := &vacuumDevice{BaseDevice: NewBaseDevice(client, info)}
	resolver := d.getSpecResolver()
	if resolver == nil {
		return nil, xiaomi.ErrNoSPEC
	}
	siid, piid, ok := resolver.find("on")
	if !ok {
		return nil, xiaomi.ErrNotSupported
	}
	d.propOn = siidPiid{siid, piid, true}
	if s, p, ok := resolver.find("mode"); ok {
		d.propMode = siidPiid{s, p, true}
	}
	if s, p, ok := resolver.find("fan-level"); ok {
		d.propFanLevel = siidPiid{s, p, true}
	}
	if s, p, ok := resolver.find("battery-level"); ok {
		d.propBattery = siidPiid{s, p, true}
	}
	return d, nil
}

func (d *vacuumDevice) Start(ctx context.Context) error {
	_, err := d.Action(ctx, d.propOn.siid, 1, nil)
	return err
}
func (d *vacuumDevice) Stop(ctx context.Context) error {
	_, err := d.Action(ctx, d.propOn.siid, 0, nil)
	return err
}
func (d *vacuumDevice) ReturnToDock(ctx context.Context) error {
	_, err := d.Action(ctx, d.propOn.siid, 2, nil)
	return err
}
func (d *vacuumDevice) SetFanLevel(ctx context.Context, level int) error {
	if !d.propFanLevel.valid {
		return xiaomi.ErrNotSupported
	}
	return d.SetProp(ctx, d.propFanLevel.siid, d.propFanLevel.piid, level)
}
func (d *vacuumDevice) GetFanLevel(ctx context.Context) (int, error) {
	if !d.propFanLevel.valid {
		return 0, xiaomi.ErrNotSupported
	}
	prop, err := d.GetProp(ctx, d.propFanLevel.siid, d.propFanLevel.piid)
	if err != nil {
		return 0, err
	}
	return toInt(prop.Value), nil
}
func (d *vacuumDevice) GetStatus(ctx context.Context) (VacuumProps, error) {
	// 云端实时查询
	keys := []xiaomi.PropKey{}
	add := func(sp siidPiid) {
		if sp.valid {
			keys = append(keys, xiaomi.PropKey{DID: d.info.DID, SIID: sp.siid, PIID: sp.piid})
		}
	}
	add(d.propOn)
	add(d.propMode)
	add(d.propFanLevel)
	add(d.propBattery)
	props, err := d.client.GetProps(ctx, keys)
	if err != nil {
		return VacuumProps{}, err
	}
	status := VacuumProps{}
	for _, p := range props {
		switch {
		case d.propOn.valid && p.SIID == d.propOn.siid && p.PIID == d.propOn.piid:
			status.On, _ = p.Value.(bool)
		case d.propMode.valid && p.SIID == d.propMode.siid && p.PIID == d.propMode.piid:
			status.Mode = toInt(p.Value)
		case d.propFanLevel.valid && p.SIID == d.propFanLevel.siid && p.PIID == d.propFanLevel.piid:
			status.FanLevel = toInt(p.Value)
		case d.propBattery.valid && p.SIID == d.propBattery.siid && p.PIID == d.propBattery.piid:
			status.Battery = toInt(p.Value)
		}
	}
	return status, nil
}

func (d *vacuumDevice) OnPropsChanged(handler func(props VacuumProps, changed string)) (string, error) {
	type field struct {
		siid, piid int
		name       string
		fill       func(*VacuumProps, interface{})
	}
	var fields []field
	if d.propOn.valid {
		fields = append(fields, field{d.propOn.siid, d.propOn.piid, "on", func(s *VacuumProps, v interface{}) { s.On, _ = v.(bool) }})
	}
	if d.propMode.valid {
		fields = append(fields, field{d.propMode.siid, d.propMode.piid, "mode", func(s *VacuumProps, v interface{}) { s.Mode = toInt(v) }})
	}
	if d.propFanLevel.valid {
		fields = append(fields, field{d.propFanLevel.siid, d.propFanLevel.piid, "fan-level", func(s *VacuumProps, v interface{}) { s.FanLevel = toInt(v) }})
	}
	if d.propBattery.valid {
		fields = append(fields, field{d.propBattery.siid, d.propBattery.piid, "battery", func(s *VacuumProps, v interface{}) { s.Battery = toInt(v) }})
	}
	if len(fields) == 0 {
		return "", xiaomi.ErrNotSupported
	}
	return d.SubProp(0, 0, func(did string, prop *xiaomi.PropertyValue) {
		for _, f := range fields {
			if f.siid == prop.SIID && f.piid == prop.PIID {
				f.fill(&d.propsCache, prop.Value)
				handler(d.propsCache, f.name)
				return
			}
		}
	})
}

func (d *vacuumDevice) GetProps() VacuumProps { return d.propsCache }
func (d *vacuumDevice) FetchProps(ctx context.Context) (VacuumProps, error) {
	status, err := d.GetStatus(ctx)
	if err != nil {
		return d.propsCache, err
	}
	d.propsCache = status
	return status, nil
}