package config

import (
	"errors"
	"os"
)

type TwitterConfig struct {
	ClientID, ClientSecret, CallbackURL, AuthorizeURL, TokenURL string
}
type Config struct {
	DatabaseURL string
	SessionKey  string
	ListenAddr  string
	Twitter     TwitterConfig
}

func NewFromEnv() (Config, error) {
	listenAddr := os.Getenv("ELON_LISTEN_ADDR")
	if listenAddr == "" {
		listenAddr = ":8000"
	}
	sessionKey := os.Getenv("ELON_SESSION_KEY")
	if sessionKey == "" {
		return Config{}, errors.New("missing ELON_SESSION_KEY")
	}
	return Config{
		DatabaseURL: os.Getenv("ELON_DATABASE_URL"),
		SessionKey:  sessionKey,
		ListenAddr:  listenAddr,
		Twitter: TwitterConfig{
			ClientID:     os.Getenv("ELON_TWITTER_CLIENT_ID"),
			ClientSecret: os.Getenv("ELON_TWITTER_CLIENT_SECRET"),
			CallbackURL:  os.Getenv("ELON_TWITTER_CALLBACK_URL"),
			AuthorizeURL: os.Getenv("ELON_TWITTER_AUTHORIZE_URL"),
			TokenURL:     os.Getenv("ELON_TWITTER_TOKEN_URL"),
		},
	}, nil
}