// Copyright (C) 2019 Marius Schellenberger

package db

import (
	"crypto/sha256"
	"time"
)

var reservedUsers = []string{
	"blacklist",
	"login",
	"logout",
	"new",
	"search",
	"sections",
	"user",
	"view",
	"wiki",
}

// Parts taken from strings.TrimPrefix
func hasTrimPrefix(s, prefix string) (string, bool) {
	if len(s) >= len(prefix) && s[0:len(prefix)] == prefix {
		return s[len(prefix):], true
	}
	return s, false
}

func reservedUser(username string) bool {
	for _, v := range reservedUsers {
		if username == v {
			return true
		}
	}
	return false
}

func validatePassword(pw string) (b []byte) {
	b = []byte(pw)
	if len(pw) <= 56 {
		return
	}
	hash := sha256.New()
	hash.Write(b)
	b = hash.Sum(nil)
	return
}

const timeFmt = "2006-01-02 15:04:05"

func now() string {
	return time.Now().Format(timeFmt)
}

func created(username string) string {
	return username + " " + now()
}