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import {  dirname,  extname,  fromFileUrl,  gte,  join,  toFileUrl,  walk,} from "./deps.ts";import { error } from "./error.ts";
const MIN_DENO_VERSION = "1.25.0";
export function ensureMinDenoVersion() {  // Check that the minimum supported Deno version is being used.  if (!gte(Deno.version.deno, MIN_DENO_VERSION)) {    let message =      `Deno version ${MIN_DENO_VERSION} or higher is required. Please update Deno.\n\n`;
    if (Deno.execPath().includes("homebrew")) {      message +=        "You seem to have installed Deno via homebrew. To update, run: `brew upgrade deno`\n";    } else {      message += "To update, run: `deno upgrade`\n";    }
    error(message);  }}
interface Manifest {  routes: string[];  islands: string[];}
export async function collect(directory: string): Promise<Manifest> {  const routesDir = join(directory, "./routes");  const islandsDir = join(directory, "./islands");
  const routes = [];  try {    const routesUrl = toFileUrl(routesDir);    // TODO(lucacasonato): remove the extranious Deno.readDir when    // https://github.com/denoland/deno_std/issues/1310 is fixed.    for await (const _ of Deno.readDir(routesDir)) {      // do nothing    }    const routesFolder = walk(routesDir, {      includeDirs: false,      includeFiles: true,      exts: ["tsx", "jsx", "ts", "js"],    });    for await (const entry of routesFolder) {      if (entry.isFile) {        const file = toFileUrl(entry.path).href.substring(          routesUrl.href.length,        );        routes.push(file);      }    }  } catch (err) {    if (err instanceof Deno.errors.NotFound) {      // Do nothing.    } else {      throw err;    }  }  routes.sort();
  const islands = [];  try {    const islandsUrl = toFileUrl(islandsDir);    for await (const entry of Deno.readDir(islandsDir)) {      if (entry.isDirectory) {        error(          `Found subdirectory '${entry.name}' in islands/. The islands/ folder must not contain any subdirectories.`,        );      }      if (entry.isFile) {        const ext = extname(entry.name);        if (![".tsx", ".jsx", ".ts", ".js"].includes(ext)) continue;        const path = join(islandsDir, entry.name);        const file = toFileUrl(path).href.substring(islandsUrl.href.length);        islands.push(file);      }    }  } catch (err) {    if (err instanceof Deno.errors.NotFound) {      // Do nothing.    } else {      throw err;    }  }  islands.sort();
  return { routes, islands };}
export async function generate(directory: string, manifest: Manifest) {  const { routes, islands } = manifest;
  const output = `// DO NOT EDIT. This file is generated by fresh.// This file SHOULD be checked into source version control.// This file is automatically updated during development when running \`dev.ts\`.
import config from "./deno.json" assert { type: "json" };${    routes.map((file, i) => `import * as $${i} from "./routes${file}";`).join(      "\n",    )  }${    islands.map((file, i) => `import * as $$${i} from "./islands${file}";`)      .join("\n")  }
const manifest = {  routes: {    ${    routes.map((file, i) => `${JSON.stringify(`./routes${file}`)}: $${i},`)      .join("\n    ")  }  },  islands: {    ${    islands.map((file, i) => `${JSON.stringify(`./islands${file}`)}: $$${i},`)      .join("\n    ")  }  },  baseUrl: import.meta.url,  config,};
export default manifest;`;
  const proc = Deno.run({    cmd: [Deno.execPath(), "fmt", "-"],    stdin: "piped",    stdout: "piped",    stderr: "null",  });  const raw = new ReadableStream({    start(controller) {      controller.enqueue(new TextEncoder().encode(output));      controller.close();    },  });  await raw.pipeTo(proc.stdin.writable);  const out = await proc.output();  await proc.status();  proc.close();
  const manifestStr = new TextDecoder().decode(out);  const manifestPath = join(directory, "./fresh.gen.ts");
  await Deno.writeTextFile(manifestPath, manifestStr);  console.log(    `%cThe manifest has been generated for ${routes.length} routes and ${islands.length} islands.`,    "color: blue; font-weight: bold",  );}
export async function dev(base: string, entrypoint: string) {  ensureMinDenoVersion();
  entrypoint = new URL(entrypoint, base).href;
  const dir = dirname(fromFileUrl(base));
  let currentManifest: Manifest;  const prevManifest = Deno.env.get("FRSH_DEV_PREVIOUS_MANIFEST");  if (prevManifest) {    currentManifest = JSON.parse(prevManifest);  } else {    currentManifest = { islands: [], routes: [] };  }  const newManifest = await collect(dir);  Deno.env.set("FRSH_DEV_PREVIOUS_MANIFEST", JSON.stringify(newManifest));
  const manifestChanged =    !arraysEqual(newManifest.routes, currentManifest.routes) ||    !arraysEqual(newManifest.islands, currentManifest.islands);
  if (manifestChanged) await generate(dir, newManifest);
  await import(entrypoint);}
function arraysEqual<T>(a: T[], b: T[]): boolean {  if (a.length !== b.length) return false;  for (let i = 0; i < a.length; ++i) {    if (a[i] !== b[i]) return false;  }  return true;}