package models

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

	"github.com/jinzhu/gorm"
)

// AppSetting singleton holds the app configuration.
type AppSetting struct {
	gorm.Model

	// 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:"-"`
}

// GetSettings gets or creates the App Settings.
func GetSettings() AppSetting {
	var s AppSetting
	r := DB.First(&s)
	if r.Error != nil {
		s = AppSetting{
			Title:       "Untitled Site",
			Description: "Just another web blog.",
			SecretKey:   MakeSecretKey(),
		}
	}

	if s.SecretKey == "" {
		s.SecretKey = MakeSecretKey()
	}

	return s
}

// Save the settings to DB.
func (s AppSetting) Save() error {
	if DB.NewRecord(s) {
		r := DB.Create(&s)
		return r.Error
	}
	r := DB.Save(&s)
	return r.Error
}

// 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)
}