package global

import (
	crand "crypto/rand" // Probably better than math/rand for this
	"log"
	"math/rand"
)

type SnowcloakConfigurationBase struct {
	Jwt string
}

func GenerateRandomString(length int) string {
	// C# had optional parameters that allowed lowercase for chardata and gpose lobbies, Go doesn't.
	// We can probably get away with just uppercase.
	allowedArray := []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
	random := make([]byte, length)
	_, err := crand.Read(random)
	if err != nil {
		log.Fatalf("Couldn't generate secure slice: %s", err)
	}
	allowedLength := len(allowedArray)
	i := 0
	charArray := make([]rune, length)
	for i < length {
		charArray[i] = allowedArray[int(random[i])%allowedLength] // Casting random[i] due to type mismatch
		i++
	}
	return string(charArray)
}

func PhasedStartupString() string {
	// Redis is used for a lot of stuff, which means the Postgres DB gets HAMMERED on a fresh startup. Use
	// this to generate a shuffled string that can be used to only allow e.g. UIDs starting with [x] to connect
	// for the first however many seconds and incrementally expand access so that data doesn't need to be loaded all at
	// once
	chars := []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
	rand.Shuffle(len(chars), func(i, j int) {
		chars[i], chars[j] = chars[j], chars[i]
	})
	return string(chars)
}