package env

import (
	"log"
	"net/url"
	"os"
)

func GuaranteeEnv(key string) string {
	variable, ok := os.LookupEnv(key)
	if !ok || variable == "" {
		log.Fatalln("Missing environment variable:", key)
	}
	return variable
}

type Config struct {
	DatabaseFile  string
	SessionSecret string
	HostRootUrl   string
	HostPort      string
	ServePort     string
	InDev         bool
	HostUrl       string
}

var Configuration Config

func init() {
	Configuration.DatabaseFile = GuaranteeEnv("LISHWIST_DATABASE_FILE")
	Configuration.SessionSecret = GuaranteeEnv("LISHWIST_SESSION_SECRET")
	Configuration.HostRootUrl = GuaranteeEnv("LISHWIST_HOST_ROOT_URL")
	Configuration.HostPort = os.Getenv("LISHWIST_HOST_PORT")
	Configuration.ServePort = GuaranteeEnv("LISHWIST_SERVE_PORT")
	Configuration.InDev = os.Getenv("LISHWIST_IN_DEV") != ""
	Configuration.HostUrl = func() string {
		rawUrl := Configuration.HostRootUrl
		if Configuration.HostPort != "" {
			rawUrl += ":" + Configuration.HostPort
		}
		u, err := url.Parse(rawUrl)
		if err != nil {
			log.Fatalln("Couldn't parse host url:", err)
		}
		return u.String()
	}()
}