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import {  basename,  dirname,  extname,  fromFileUrl,  join,  resolve,} from "../deps.ts";
/** * Return a stat, maybe. * * @param {string} path * @return {Promise<Deno.FileInfo>} * @private */async function tryStat(path: string) {  try {    return await Deno.stat(path);  } catch {    return undefined;  }}
function toPath(pathLike: string) {  return pathLike.startsWith("file:") ? fromFileUrl(pathLike) : pathLike;}
export class View {  defaultEngine!: any;  ext!: any;  name!: any;  root!: any;  engine!: any;  pathPromise!: any;
  /**   * Initialize a new `View` with the given `name`.   *   * Options:   *   *   - `defaultEngine` the default template engine name   *   - `engines` template engine require() cache   *   - `root` root path for view lookup   *   * @param {string} name   * @param {object} options   */  constructor(fileName: string, options: any = {}) {    this.defaultEngine = options.defaultEngine;    this.ext = extname(fileName);    this.name = fileName;
    if (Array.isArray(options.root)) {      this.root = options.root.map(toPath);    } else {      this.root = toPath(options.root);    }
    if (!this.ext && !this.defaultEngine) {      throw new Error(        "No default engine was specified and no extension was provided.",      );    }
    if (!this.ext) {      // get extension from default engine name      this.ext = this.defaultEngine[0] !== "."        ? `.${this.defaultEngine}`        : this.defaultEngine;
      fileName += this.ext;    }
    if (!options.engines[this.ext]) {      throw new Error(        `Could not find a view engine for extension "${this.ext}"`,      );    }
    // store loaded engine    this.engine = options.engines[this.ext];
    // lookup path    this.pathPromise = this.lookup(fileName);  }
  /**   * Resolve the file within the given directory.   *   * @param {string} dir   * @param {string} file   * @private   */  async resolve(dir: string, file: string) {    let path = join(dir, file);    let stat = await tryStat(path);
    if (stat && stat.isFile) {      return path;    }
    // <path>/index.<ext>    const ext = this.ext;    path = join(dir, basename(file, ext), `index${ext}`);    stat = await tryStat(path);
    if (stat && stat.isFile) {      return path;    }  }
  /**   * Lookup view by the given `name`   *   * @param {string} name   * @private   */  async lookup(name: string) {    const roots = [].concat(this.root);    let path;
    for (let i = 0; i < roots.length && !path; i++) {      const root = roots[i];      const loc = resolve(root, name);      const dir = dirname(loc);      const file = basename(loc);      path = await this.resolve(dir, file);    }
    return path;  }
  /**   * Render with the given options.   *   * @param {object} options   * @param {Function} callback   * @private   */  async render(options: object, callback: Function) {    const path = await this.pathPromise;    const out = await this.engine(path, options);    callback(undefined, out);  }}