Uuids.kt

package com.hexagonkt.core

import com.hexagonkt.core.text.decodeBase64
import com.hexagonkt.core.text.encodeToBase64
import java.nio.ByteBuffer
import java.util.*

// TODO UUIDv7: https://antonz.org/uuidv7/?ref=dailydev#kotlin
/*
    import java.security.SecureRandom
    import java.time.Instant

    object UUIDv7 {
        private val random = SecureRandom()

        fun generate(): ByteArray {
            // random bytes
            val value = ByteArray(16)
            random.nextBytes(value)

            // current timestamp in ms
            val timestamp = Instant.now().toEpochMilli()

            // timestamp
            value[0] = ((timestamp shr 40) and 0xFF).toByte()
            value[1] = ((timestamp shr 32) and 0xFF).toByte()
            value[2] = ((timestamp shr 24) and 0xFF).toByte()
            value[3] = ((timestamp shr 16) and 0xFF).toByte()
            value[4] = ((timestamp shr 8) and 0xFF).toByte()
            value[5] = (timestamp and 0xFF).toByte()

            // version and variant
            value[6] = (value[6].toInt() and 0x0F or 0x70).toByte()
            value[8] = (value[8].toInt() and 0x3F or 0x80).toByte()

            return value
        }

        @JvmStatic
        fun main(args: Array<String>) {
            val uuidVal = generate()
            uuidVal.forEach { b -> print("%02x".format(b)) }
            println()
        }
    }
 */
// TODO Rename to Ids.kt and support other algorithms (nanoid, ulid, snowflake, cuid)

/**
 * [TODO](https://github.com/hexagontk/hexagon/issues/271).
 *
 * @receiver .
 * @return .
 */
fun UUID.bytes(): ByteArray =
    ByteBuffer.wrap(ByteArray(16)).let {
        it.putLong(this.mostSignificantBits)
        it.putLong(this.leastSignificantBits)
        it.array()
    }

/**
 * [TODO](https://github.com/hexagontk/hexagon/issues/271).
 *
 * @receiver .
 * @return .
 */
fun UUID.toBase64(): String =
    bytes().encodeToBase64()

/**
 * [TODO](https://github.com/hexagontk/hexagon/issues/271).
 *
 * @param text .
 * @return .
 */
fun uuid(text: String): UUID =
    if (text[8] == '-') UUID.fromString(text)
    else uuid(text.decodeBase64())

/**
 * [TODO](https://github.com/hexagontk/hexagon/issues/271).
 *
 * @param bytes .
 * @return .
 */
fun uuid(bytes: ByteArray): UUID =
    ByteBuffer.wrap(bytes).let { UUID(it.long, it.long) }