package delinea

import (
	"fmt"
	"os"
)

type config struct {
	tld          string
	urlTemplate  string
	tenant       string
	clientID     string
	clientSecret string
}

func loadConfigFromEnv() (*config, error) {
	var cfg config
	var err error

	// Optional settings
	cfg.tld, _ = getEnv("DELINEA_TLD")
	cfg.urlTemplate, _ = getEnv("DELINEA_URL_TEMPLATE")

	// Required settings
	cfg.tenant, err = getEnv("DELINEA_TENANT")
	if err != nil {
		return nil, err
	}
	cfg.clientID, err = getEnv("DELINEA_CLIENT_ID")
	if err != nil {
		return nil, err
	}
	cfg.clientSecret, err = getEnv("DELINEA_CLIENT_SECRET")
	if err != nil {
		return nil, err
	}

	return &cfg, nil
}

func getEnv(name string) (string, error) {
	value, ok := os.LookupEnv(name)
	if !ok {
		return "", fmt.Errorf("environment variable %q is not set", name)
	}
	return value, nil
}