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import { Cache, extname, green } from "./deps.ts";
export type ArchUrls = {  [arch in typeof Deno.build.arch]?: string;};
export interface CrossOptions {  name: string;  urls: { [os in typeof Deno.build.os]?: string | ArchUrls };  policy?: CachePolicy;  cache?: string;  log?: boolean;}
export interface UrlOptions {  url: string;  policy?: CachePolicy;  cache?: string;  log?: boolean;}
export interface SingleOptions {  name: string;  url: string;  policy?: CachePolicy;  cache?: string;  log?: boolean;}
export type Options = string | UrlOptions | CrossOptions | SingleOptions;
export type CachePolicy = "NONE" | "STORE";export const CachePolicy = {  NONE: "NONE",  STORE: "STORE",} as const;
export const os = Deno.build.os;export const arch = Deno.build.arch;export const extensions: { [os in typeof Deno.build.os]: string } = {  darwin: ".dylib",  linux: ".so",  windows: ".dll",};export const prefixes: { [os in typeof Deno.build.os]: string } = {  darwin: "lib",  linux: "lib",  windows: "",};
export class PlugError extends Error {  constructor(message: string) {    super(message);
    this.name = "PlugError";    this.stack = undefined;  }}
export class PlugImportError extends Error {  constructor(message: string) {    super(message);
    this.name = "PlugImportError";    this.stack = undefined;  }}
export async function download(options: Options): Promise<string> {  if (typeof options === "string") {    options = { url: options };  }
  const directory = options.cache ?? Cache.options.directory;  const policy = options.policy === CachePolicy.NONE    ? Cache.RELOAD_POLICY    : undefined;  Cache.configure({ directory });
  let url;  if ("urls" in options) {    url = options.urls[os];    if (url !== undefined && typeof url !== "string") {      url = url[arch];    }
    if (!url) {      throw new PlugImportError(        `URL for "${arch}-${os}" platform was not provided.`,      );    }  } else {    url = options.url;  }
  const pref = prefixes[os];  const ext = extensions[os];
  if ("name" in options && !Object.values(extensions).includes(extname(url))) {    url = `${url}${(url.endsWith("/") ? "" : "/")}${pref}${options.name}${ext}`;  }
  const plug = Cache.namespace("plug");  if ((options.log ?? true) && !(await plug.exists(url))) {    console.log(`${green("Download")} ${url}`);  }  const file = await plug.cache(url, policy);
  return file.path;}
export async function prepare<S extends Record<string, Deno.ForeignFunction>>(  options: Options,  symbols: S,): Promise<Deno.DynamicLibrary<S>> {  const file = await download(options);  return Deno.dlopen(file, symbols);}