package settings

import (
	"crypto/rand"
	"encoding/base64"

	"git.kirsle.net/apps/gophertype/pkg/session"
)

// Current holds the current app settings. When the app settings have never
// been initialized, this struct holds the default values with a random secret
// key. The config is not saved to DB until you call Save() on it.
var Current = Load()

// Spec singleton holds the app configuration.
type Spec struct {
	// Sets to `true` when the site's initial setup has run and an admin created.
	Initialized bool

	// Site information
	Title       string
	Description string
	Email       string // primary email for notifications
	NSFW        bool
	BaseURL     string

	// Blog settings
	PostsPerPage int

	// Mail settings
	MailEnabled  bool
	MailSender   string
	MailHost     string
	MailPort     int
	MailUsername string
	MailPassword string

	// Security
	SecretKey string `json:"-"`
}

// Load gets or creates the App Settings.
func Load() Spec {
	var s = Spec{
		Title:       "Untitled Site",
		Description: "Just another web blog.",
		SecretKey:   MakeSecretKey(),
	}

	session.SetSecretKey([]byte(s.SecretKey))

	return s
}

// Save the settings to DB.
func (s Spec) Save() error {
	Current = s
	session.SetSecretKey([]byte(s.SecretKey))
	return nil
}

// MakeSecretKey generates a secret key for signing HTTP cookies.
func MakeSecretKey() string {
	keyLength := 32

	b := make([]byte, keyLength)
	rand.Read(b)
	return base64.URLEncoding.EncodeToString(b)
}