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import { basename, extname } from "../deps/path.ts";import { Exception } from "./errors.ts";import AssetLoader from "./asset_loader.ts";
import type { Data, Dest, Page, Src } from "../core.ts";
/** * Class to load page files that generate HTML documents. * It's very similar to the AssetLoader, but it removes the extension * and ensure there's a `date` property in the data. */export default class PageLoader extends AssetLoader {  /** Prepare the data and the page */  prepare(page: Page, data: Data): void {    super.prepare(page, data);
    const datePath = this.#handleDatePath(page.src, page.dest);
    // Ensure the data prop is defined    if (!data.date) {      data.date = datePath ?? page.src.created ?? page.src.lastModified;    } else if (!(data.date instanceof Date)) {      throw new Exception(        'Invalid date. Use "yyyy-mm-dd" or "yyy-mm-dd hh:mm:ss" formats',        { page },      );    }
    // Handle subextensions, like styles.css.njk    const subext = extname(page.dest.path);
    if (subext) {      page.dest.path = page.dest.path.slice(0, -subext.length);      page.dest.ext = subext;    } else {      page.dest.ext = "";    }  }
  /**   * Detect the date of the page in the filename   * and remove it in dest.path   * Example: 2019-01-01_hello-world.md   */  #handleDatePath(src: Src, dest: Dest): Date | undefined {    const fileName = basename(src.path);
    const dateInPath = fileName.match(      /^(\d{4})-(\d\d)-(\d\d)(?:-(\d\d)-(\d\d)(?:-(\d\d))?)?_/,    );
    if (dateInPath) {      const [found, year, month, day, hour, minute, second] = dateInPath;      dest.path = dest.path.replace(found, "");
      return new Date(Date.UTC(        parseInt(year),        parseInt(month) - 1,        parseInt(day),        hour ? parseInt(hour) : 0,        minute ? parseInt(minute) : 0,        second ? parseInt(second) : 0,      ));    }
    const orderInPath = fileName.match(/^(\d+)_/);
    if (orderInPath) {      const [found, timestamp] = orderInPath;      dest.path = dest.path.replace(found, "");      return new Date(parseInt(timestamp));    }  }}