package temperature

import (
	"fmt"
	"io"
	"path/filepath"
	"text/tabwriter"

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

// AddDS18B20 a new temperature sensor from type ds18b20
func AddDS18B20(sensorID, sensorName, configDir, wirePath string) error {

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

	// check if sensor exists
	if !sensor.Exists(wirePath, sensorID) {
		return fmt.Errorf("Can not find sensor: %v", filepath.Join(wirePath, sensorID))
	}

	// check if sensor is redundant
	if sensor.IsRedundant(sensorID, cnf.TemperatureSensors) {
		return fmt.Errorf("Sensor %v already exists as temperature sensor", sensorID)
	}

	temperatureSensor := &types.WireSensor{
		ID:       sensorID,
		Name:     sensorName,
		Typ:      types.SENSOR_DS18B20,
		WirePath: wirePath,
	}

	// append sensor to list
	cnf.TemperatureSensors = append(cnf.TemperatureSensors, temperatureSensor)

	// write cnf file
	if err := config.Write(cnf, configDir); err != nil {
		return err
	}

	return nil
}

// Print a list with the given writer w over all temperature sensors
func Print(w io.Writer, configDir string, quiet bool) error {

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

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

	// headline
	if !quiet {
		fmt.Fprint(tw, "id\tname\ttype\tpath\n")
	}

	for _, sensor := range cnf.TemperatureSensors {
		if quiet {
			fmt.Fprintf(tw, "%v\n", sensor.ID)
		} else {
			fmt.Fprintf(tw, "%v\t%v\t%v\t%v\n", sensor.ID, sensor.Name, sensor.Typ, sensor.WirePath)
		}
	}

	tw.Flush()

	return nil
}

// Remove a temperature sensor over the given sensor id
func Remove(sensorID, configDir string) error {

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

	// remove matching sensor ids
	var j int
	for _, sensor := range cnf.TemperatureSensors {
		if sensor.ID == sensorID {
			cnf.TemperatureSensors = append(cnf.TemperatureSensors[:j], cnf.TemperatureSensors[j+1:]...)
			if j > 0 {
				j = j - 1
			}
			continue
		}
		j++
	}

	// write cnf file
	if err := config.Write(cnf, configDir); err != nil {
		return err
	}

	return nil
}