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import { existsSync } from "https://deno.land/std/fs/exists.ts";import * as log from "https://deno.land/std/log/mod.ts";import * as path from "https://deno.land/std/path/mod.ts";import { encode, Hash } from "https://deno.land/x/checksum@1.1.0/mod.ts";
const os = Deno.build.os;const md5 = new Hash("md5");
const PLUGIN_SUFFIX_MAP: { [os in Deno.OperatingSystem]: string } = {  mac: ".dylib",  win: ".dll",  linux: ".so"};
const pluginSuffix = PLUGIN_SUFFIX_MAP[os];
export interface PreprareOptions {  name: string;  printLog?: boolean;  checkCache?: boolean;  urls: {    mac?: string;    linux?: string;    win?: string;  };}
export async function prepare(options: PreprareOptions) {  const { name, urls, printLog = true, checkCache = true } = options;
  if (printLog) {    await log.setup({});  }
  const remoteUrl = urls[os];  const remoteHash = md5.digest(encode(remoteUrl + pluginSuffix)).hex();  const cacheFileName = `${name}_${remoteHash}${pluginSuffix}`;  const localPath = path.resolve(".deno_plugins", cacheFileName);
  Deno.mkdirSync(".deno_plugins", { recursive: true });
  if (!existsSync(localPath) || !checkCache) {    if (!remoteUrl) {      throw Error(        `"${name}" plugin does not provide binaries suitable for the current system`      );    }
    if (remoteUrl.startsWith("file://")) {      const fromPath = path.resolve(remoteUrl.slice(7));      await copyFromLocal(name, fromPath, localPath);    } else {      await downloadFromRemote(name, remoteUrl, localPath);    }  }
  log.info(`load deno plugin "${name}" from local "${localPath}"`);  return Deno.openPlugin(localPath);}
async function downloadFromRemote(  name: string,  remoteUrl: string,  savePath: string) {  log.info(`downloading deno plugin "${name}" from "${remoteUrl}"`);  const download = await fetch(remoteUrl);
  if (download.status !== 200) {    throw Error(`downloading plugin "${name}" from "${remoteUrl}" failed.`);  }
  const pluginFileData = await download.arrayBuffer();  await Deno.writeFile(savePath, new Uint8Array(pluginFileData));}
async function copyFromLocal(name: string, from: string, to: string) {  log.info(`copy deno plugin "${name}" from "${from}"`);
  if (!existsSync(from)) {    throw Error(      `copy plugin "${name}" from "${from}" failed, ${from} does not exist.`    );  }
  await Deno.copyFile(from, to);}