package config

import (
	"fmt"
	"io"
	"os"
	"regexp"

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

var validUUID = regexp.MustCompile("^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$")

type Config interface {
	AddSensor(sensor *types.Sensor) error
	AddRemote(remote *Remote) error
	DisableRemote(nameOrUUID string) error
	DisableSensor(nameOrUUID string) error
	EnableRemote(nameOrUUID string) error
	EnableSensor(nameOrUUID string) error
	GetDevice() *Device
	GetRemotes() []*Remote
	GetSensors() []*types.Sensor
	JSONDecoder(r io.Reader) error
	JSONWriter(w io.Writer) error
	RemoveSensor(nameOrUUID string) error
	RemoveRemote(nameOrUUID string) error
	SetDevice(device *Device)
	ToJSON() (string, error)
}

// Read the configuration file
func Read(configFile string) (*FluckyConfig, error) {

	fc := &FluckyConfig{}

	f, err := os.Open(configFile)
	if err != nil {
		return nil, fmt.Errorf("Can not open file %v: %v", configFile, err)
	}
	defer f.Close()

	err = fc.JSONDecoder(f)
	if err != nil {
		return nil, fmt.Errorf("Can not decode json file %v: %v", configFile, err)
	}

	return fc, nil

}

// Write the configuration into a file, specified by the configuration filepath
func Write(cfg Config, configFile string) error {

	f, err := os.Create(configFile)
	if err != nil {
		return err
	}
	defer f.Close()

	err = cfg.JSONWriter(f)
	if err != nil {
		return err
	}

	return nil

}