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import { decode, encode } from "./deps.ts";import { importUrls } from "./search.ts";import { versioned, Versioned } from "./versioned.ts";
// FIXME we should catch ctrl-c etc. and write back the original deps.ts
export async function update(  filename: string,  test: () => Promise<boolean>): Promise<void> {  const u = new Update(filename, test);  await u.update();}
export class Update {  private filename: string;  private test: () => Promise<boolean>;
  constructor(filename: string, test: () => Promise<boolean>) {    this.filename = filename;    this.test = test;  }
  async update(): Promise<void> {    // first we test the thunk works prior to updatng...    if (await this.test()) {      console.error("Tests failed prior to update");      Deno.exit(1);    }
    const content: string = await this.content(); // decode(await Deno.readFile(filename));
    const urls: string[] = importUrls(content);
    // from a url we need to extract the current version    for (const u of urls) {      const v = versioned(u);      if (v !== undefined) {        await this.updateOne(v!);      }    }    // TODO count the imports that were updated  }
  async updateOne(    url: Versioned  ): Promise<void> {    // now we look up the available versions    const versions = await url.all();    console.log("current version:", url.current());    console.log("available versions:", versions);
    // TODO: options: try latest, semver compat, or input    // pick a new version (should be in for loop?)    // i.e. rety or skip if fails
    // for now, let's pick the most recent!    const newVersion = versions[0];    if (url.current() === newVersion) {      return;    }    const fails: boolean = await this.updateIfTestPasses(url, newVersion);  }
  async updateIfTestPasses(    url: Versioned,    newVersion: string  ): Promise<boolean> {    const newUrl = url.at(newVersion);    console.log("Updating to", newUrl.url);    await this.replace(url, newUrl);
    console.log("Running tests...");    if (await this.test()) {      console.log("Test failed, reverting.");      await this.replace(newUrl, url);      return true;    } else {      console.log("Test passed.");      return false;    }  }
  async content(): Promise<string> {    return decode(await Deno.readFile(this.filename));  }
  async replace(url: Versioned, newUrl: Versioned) {    const content = await this.content();    const newContent = content.split(url.url).join(newUrl.url);    await Deno.writeFile(this.filename, encode(newContent));  }}