package main

import (
	"log"
	"os"
	"strconv"

	"github.com/joho/godotenv"
)

const (
	SECURE        = "SECURE"
	PASSWORD_HASH = "PASSWORD_HASH"
)

type EnvVars struct {
	PasswordHash []byte // hashed passwd of the admin/only user.
	Secure       bool   // whether or not the frontend is served via HTTPs.
}

func LoadEnv() EnvVars {
	var env EnvVars
	var err error
	godotenv.Load()

	env.PasswordHash = []byte(os.Getenv(PASSWORD_HASH))
	secureVar, found := os.LookupEnv(SECURE)
	if found {
		env.Secure, err = strconv.ParseBool(secureVar)
		if err != nil {
			panic("Invalid HTTPS value: Should be either 'true' or 'false'")
		}
	} else {
		env.Secure = false // assume false by default
	}

	return env
}

// reads and saves a single key to the .env
func SaveKeyToEnv(key string, value string) {
	env, err := godotenv.Read(".env")
	if err != nil && !os.IsNotExist(err) {
		log.Fatal("Failed to read .env: " + err.Error())
	}

	env[key] = value

	if err := godotenv.Write(env, ".env"); err != nil {
		log.Fatal(err)
	}
}