package variables

import (
	lucifer3 "git.aiterp.net/lucifer3/server"
	"git.aiterp.net/lucifer3/server/events"
	"git.aiterp.net/lucifer3/server/services"
)

func NewService(resolver *services.Resolver) lucifer3.Service {
	return &service{
		resolver:     resolver,
		temperatures: map[string]float64{},
		motions:      map[string]float64{},
	}
}

type service struct {
	resolver     *services.Resolver
	temperatures map[string]float64
	motions      map[string]float64
}

func (s *service) Active() bool {
	return true
}

func (s *service) HandleEvent(bus *lucifer3.EventBus, event lucifer3.Event) {
	var patchEvents []lucifer3.Event

	switch event := event.(type) {
	case events.MotionSensed:
		s.motions[event.ID] = event.SecondsSince
		patchEvents = s.updateDevice(event.ID)
	case events.TemperatureChanged:
		s.temperatures[event.ID] = event.Temperature
		patchEvents = s.updateDevice(event.ID)
	case events.AliasAdded:
		patchEvents = s.updateDevice(event.ID)
	case events.AliasRemoved:
		patchEvents = s.updateDevice(event.ID)
	}

	bus.RunEvents(patchEvents)
}

func (s *service) updateDevice(id string) []lucifer3.Event {
	ptr := s.resolver.GetByID(id)
	if ptr == nil {
		return nil
	}

	res := make([]lucifer3.Event, 0, len(ptr.Aliases)+1)

	for _, alias := range append([]string{ptr.ID}, ptr.Aliases...) {
		patch := PropertyPatch{Key: alias}
		motionSamples := 0.0
		motionTotal := 0.0
		temperatureSamples := 0.0
		temperatureTotal := 0.0

		for _, ptr := range s.resolver.Resolve(alias) {
			if temp, ok := s.temperatures[ptr.ID]; ok {
				if patch.Temperature == nil {
					patch.Temperature = &AvgMinMax{}
					if temp < patch.Temperature.Min || temperatureSamples == 0.0 {
						patch.Temperature.Min = temp
					}
					if temp > patch.Temperature.Max {
						patch.Temperature.Max = temp
					}

					temperatureSamples += 1.0
					temperatureTotal += temp
				}
			}
			if motion, ok := s.motions[ptr.ID]; ok {
				if patch.Motion == nil {
					patch.Motion = &AvgMinMax{}
					if motion < patch.Motion.Min || motionSamples == 0.0 {
						patch.Motion.Min = motion
					}
					if motion > patch.Motion.Max {
						patch.Motion.Max = motion
					}

					motionSamples += 1.0
					motionTotal += motion
				}
			}
		}

		if temperatureSamples > 0.5 {
			patch.Temperature.Avg = temperatureTotal / temperatureSamples
		}
		if motionSamples > 0.5 {
			patch.Motion.Avg = motionTotal / motionSamples
		}

		res = append(res, patch)
	}

	return res
}