import { v1, v4, v7 } from "uuid"

export const uuid = {
    v1: v1,
    v4: v4,
    v7: v7,

    toArrayBuffer: uuidToArrayBuffer,
    fromArrayBuffer: uuidFromArrayBuffer,
    toUnit8Array: uuidToUnit8Array,
    fromUnit8Array: uuidFromUnit8Array,
}

const UUID = uuid
export { UUID }

function uuidToUnit8Array(uuid: string): Uint8Array {
    // 移除 UUID 中的破折号
    const hex = uuid.replace(/-/g, "")

    // 创建一个 Uint8Array 来存储字节
    const buffer = new Uint8Array(hex.length / 2)

    // 将每两个十六进制字符转换为一个字节
    for (let i = 0; i < hex.length; i += 2) {
        buffer[i / 2] = parseInt(hex.substring(i, i + 2), 16)
    }
    return buffer
}

function uuidFromUnit8Array(buffer: Uint8Array): string {
    // 将 Uint8Array 转换为十六进制字符串
    const hex = Array.from(buffer)
        .map((byte) => byte.toString(16).padStart(2, "0"))
        .join("")

    // 插入破折号以形成标准 UUID 格式
    return `${hex.substring(0, 8)}-${hex.substring(8, 12)}-${hex.substring(12, 16)}-${hex.substring(
        16,
        20
    )}-${hex.substring(20)}`
}

/** 把 UUID 字符串形式转换为 ArrayBuffer */
function uuidToArrayBuffer(uuid: string): ArrayBuffer {
    let uuid_u8 = uuidToUnit8Array(uuid)
    return <ArrayBuffer>uuid_u8.buffer
}

/** 把 ArrayBuffer 形式的 UUID 转换为 UUID 字符串形式 */
function uuidFromArrayBuffer(buffer: ArrayBuffer): string {
    const uint8Array = new Uint8Array(buffer)
    return uuidFromUnit8Array(uint8Array)
}