package sensors

import (
	"encoding/json"
	"log/slog"
	"math/rand"
	"nats-app/internal/broker"
	"time"
)

type Simulator struct {
	*broker.NATS
}

func Start(nats *broker.NATS) *Simulator {
	return &Simulator{
		NATS: nats,
	}
}

func (s *Simulator) SimulateSensor(sensor Sensor) {
	ticker := time.NewTicker(*sensor.SamplingInterval * time.Second)
	defer ticker.Stop()

	for range ticker.C {
		data := s.generateData(sensor)

		if data.SensorID == "" {
			slog.Warn("sensor data generation failed", "sensor_id", sensor.SensorID)
			continue
		}

		payload, err := json.Marshal(data)
		if err != nil {
			slog.Error("failed to marshal sensor data", "error", err, "sensor_id", sensor.SensorID)
			continue
		}

		subject := subjectSensorsData + sensor.SensorID
		if err := s.Publish(subject, payload); err != nil {
			slog.Error("failed to publish sensor data", "error", err, "subject", subject)
		} else {
			slog.Debug("sensor data published", "sensor_id", sensor.SensorID, "value", data.Value)
		}
	}

}

func (s *Simulator) generateData(sensor Sensor) SensorData {
	now := time.Now()
	data := SensorData{
		SensorID:  sensor.SensorID,
		Timestamp: &now,
	}

	if rand.Float64() < 0.05 {
		return SensorData{}
	}

	var value float64
	switch sensor.SensorType {
	case Temperature:
		value = -20 + rand.Float64()*100
	case Humidity:
		value = 10 + rand.Float64()*90
	case CarbonDioxide:
		value = 980 + rand.Float64()*60
	case Pressure:
		value = 950 + rand.Float64()*100
	case Proximity:
		value = rand.Float64() * 400
	case Light:
		value = rand.Float64() * 10000
	default:
		value = rand.Float64() * 100
	}
	data.Value = &value

	return data
}