package temperature

import (
	"fmt"
	"io"
	"log"
	"os"
	"os/signal"
	"syscall"
	"text/tabwriter"
	"time"

	stypes "git.cryptic.systems/fh-trier/go-flucky-server/pkg/types"
	"git.cryptic.systems/fh-trier/go-flucky/pkg/remote"
	"git.cryptic.systems/fh-trier/go-flucky/pkg/types"

	"git.cryptic.systems/fh-trier/go-flucky/pkg/config"

	uuid "github.com/satori/go.uuid"
	"github.com/yryz/ds18b20"
)

// Get ...
func Get(w io.Writer, sensorName string, configDir string) error {

	temperature, err := getTemperature(sensorName, configDir)
	if err != nil {
		return err
	}

	fmt.Fprintf(w, "%3.3f\n", temperature.TemperatureValue)
	return nil

}

// Logs ...
func Logs(w io.Writer, configDir string) error {

	// get cnf
	cnf, err := config.Read(configDir)
	if err != nil {
		return err
	}

	// declar tabwriter
	tw := tabwriter.NewWriter(w, 0, 0, 5, ' ', 0)

	// headlines
	for _, sensor := range cnf.TemperatureSensors {
		if sensor.Name != "" {
			fmt.Fprintf(tw, "%v\t", sensor.Name)
		} else {
			fmt.Fprintf(tw, "%v\t", sensor.ID)
		}

	}
	fmt.Fprint(tw, "\n")

	// body
	ticker := time.NewTicker(1 * time.Second)

	go func() {
		for {
			select {
			case _, more := <-ticker.C:
				if !more {
					return
				}

				for _, sensor := range cnf.TemperatureSensors {
					temperature, err := ds18b20.Temperature(sensor.ID)
					if err != nil {
						return
					}
					fmt.Fprintf(tw, "%3.3f°\t", temperature)
				}

				fmt.Fprint(tw, "\n")

				tw.Flush()

			}
		}
	}()

	signalChannel := make(chan os.Signal)
	signal.Notify(signalChannel, syscall.SIGINT, syscall.SIGTERM)

	sig := <-signalChannel
	log.Printf("Got signal %s, initiating shutdown\n", sig)
	ticker.Stop()

	return nil
}

// Push ...
func Push(sensorName, configDir string) error {

	temperature, err := getTemperature(sensorName, configDir)
	if err != nil {
		return err
	}

	if err := remote.SendTemperature(&temperature, configDir); err != nil {
		return err
	}

	return nil

}

func getTemperature(sensorName, configDir string) (stypes.Temperature, error) {
	cnf, err := config.Read(configDir)
	if err != nil {
		return stypes.Temperature{}, err
	}

	var foundSensor types.WireSensor
	var sensorFound bool
	for _, sensor := range cnf.TemperatureSensors {
		if sensor.ID == sensorName || sensor.Name == sensorName {
			foundSensor = *sensor
			sensorFound = true
			break
		}
	}

	if !sensorFound {
		return stypes.Temperature{}, fmt.Errorf("Sensor not found sensor %v in config", sensorName)
	}

	t, err := ds18b20.Temperature(foundSensor.ID)
	if err != nil {
		return stypes.Temperature{}, fmt.Errorf("Can not read temperature from sensor %v: %v", foundSensor.ID, err)
	}

	temperature := stypes.Temperature{
		TemperatureID:    uuid.NewV4().String(),
		TemperatureValue: t,
		SensorID:         foundSensor.ID,
		TemperatureDate:  time.Now(),
		DeviceID:         cnf.DeviceID,
	}

	return temperature, nil
}