package types

import (
	"fmt"
	"time"
)

// Sensor represents a sensor with all his settings. The struct does not
// contains any read method.
type Sensor struct {
	ID           string     `json:"id" xml:"id"`
	Name         string     `json:"name" xml:"name"`
	Location     string     `json:"location" xml:"location"`
	WireID       *string    `json:"wire_id" xml:"wire_id"`
	I2CBus       *int       `json:"i2c_bus" xml:"i2c_bus"`
	I2CAddress   *uint8     `json:"i2c_address" xml:"i2c_address"`
	GPIONumber   string     `json:"gpio_number" xml:"gpio_number"`
	Model        string     `json:"model" xml:"model"`
	Enabled      bool       `json:"enabled" xml:"enabled"`
	TickDuration string     `json:"tick_duration" xml:"tick_duration"`
	DeviceID     string     `json:"device_id" xml:"device_id"`
	CreationDate time.Time  `json:"creation_date" xml:"creation_date"`
	UpdateDate   *time.Time `json:"update_date" xml:"update_date"`
}

// GetTicker returns a new ticker, which tick every when the sensor should be
// read
func (s *Sensor) GetTicker() *time.Ticker {
	duration, err := time.ParseDuration(s.TickDuration)
	if err != nil {
		duration = time.Minute
	}
	return time.NewTicker(duration)
}

// FilterSensorByMeasuredValueTypes filters sensors by the measured values types
// which they measure
func FilterSensorByMeasuredValueTypes(sensors []*Sensor, measuredValueTypes ...MeasuredValueType) ([]*Sensor, error) {
	cachedSensors := make([]*Sensor, 0)

	mapping := map[MeasuredValueType][]string{
		Humidity:    {"BME280", "DHT11", "DHT22"},
		Pressure:    {"BME280"},
		Temperature: {"BME280", "DHT11", "DHT22", "DS18B20"},
	}

	for i := range measuredValueTypes {
		mappedSensors, ok := mapping[measuredValueTypes[i]]
		if !ok {
			return nil, fmt.Errorf("No mapping for measured values type %v available", measuredValueTypes[i])
		}

	LOOP:
		for j := range sensors {
			for k := range mappedSensors {
				if sensors[j].Model == mappedSensors[k] {
					cachedSensors = append(cachedSensors, sensors[j])
					continue LOOP
				}
			}
		}
	}

	return cachedSensors, nil
}