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import HandlebarsJS from "https://dev.jspm.io/handlebars@4.7.6";import { walk } from "https://deno.land/std@0.51.0/fs/mod.ts";import {  globToRegExp,  normalize,  join,} from "https://deno.land/std@0.51.0/path/mod.ts";const { readFile } = Deno;
interface HandlebarsConfig {  baseDir: string;  extname: string;  layoutsDir: string;  partialsDir: string;  defaultLayout: string;  helpers: any;  compilerOptions: any;}
const DEFAULT_HANDLEBARS_CONFIG: HandlebarsConfig = {  baseDir: "views",  extname: ".hbs",  layoutsDir: "layouts/",  partialsDir: "partials/",  defaultLayout: "main",  helpers: undefined,  compilerOptions: undefined,};
function getNormalizePath(path: string) {  return normalize(path).replace(/\\/g, "/");}
export class Handlebars {  constructor(private config: HandlebarsConfig = DEFAULT_HANDLEBARS_CONFIG) {    this.config = { ...DEFAULT_HANDLEBARS_CONFIG, ...config };
    console.log(this.config);  }
  /**     * Processes of rendering view     *     * @param view     * @param context     * @param layout     */  public async renderView(    view: string,    context?: Object,    layout?: string,  ): Promise<string> {    if (!view) {      console.warn("View is null");      return "";    }
    const config: HandlebarsConfig = this.config as HandlebarsConfig;
    const partialsPathes = await this.getTemplatesPath(      join(config.baseDir, config.partialsDir),    );    partialsPathes && (await this.registerPartials(partialsPathes));
    const path = join(config.baseDir, view + config.extname);    const body: string = await this.render(path, context);
    layout = (layout as string) || config.defaultLayout;
    if (layout) {      const layoutPath: string = join(        config.baseDir,        config.layoutsDir,        layout + config.extname,      );
      return this.render(layoutPath, { ...context, body });    }
    return body;  }
  /**     * Processes on render without partials and layouts     */  public async render(path: string, context?: Object): Promise<string> {    // TODO: use cashe    const source: string = new TextDecoder().decode(await readFile(path));    const template = HandlebarsJS.compile(source, this.config!.compilerOptions);
    return template(context);  }
  /**     * Processes on register partials     */  private async registerPartials(pathes: string[]) {    for (const path of pathes) {      const templateName: string = path        .replace(          getNormalizePath(this.config.baseDir) + "/" +            this.config!.partialsDir,          "",        )        .replace(new RegExp(this.config!.extname + "$"), "");      const source: string = new TextDecoder().decode(await readFile(path));
      HandlebarsJS.registerPartial(templateName, source);    }  }
  /**     * Gets template pathes with glob match     */  private async getTemplatesPath(path: string): Promise<string[]> {    const arr: string[] = [];
    for await (      const w of walk(        path,        { match: [globToRegExp("**/*" + this.config!.extname)] },      )    ) {      if (w.isFile) {        arr.push(getNormalizePath(w.path));      }    }
    return arr;  }}