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import { Site } from "../core.ts";import { Eta } from "../deps/eta.ts";import { posix } from "../deps/path.ts";import loader from "../core/loaders/text.ts";import { merge } from "../core/utils.ts";
import type { Data, Engine, Helper, HelperOptions } from "../core.ts";import type { EtaConfig } from "../deps/eta.ts";
export interface Options {  /** The list of extensions this plugin applies to */  extensions: string[] | {    pages: string[];    components: string[];  };
  /** Custom includes path */  includes: string;
  /** Configuration to pass to Eta */  options: Partial<EtaConfig>;}
// Default optionsexport const defaults: Options = {  extensions: [".eta"],  includes: "",  options: {    useWith: true,  },};
/** Template engine to render Eta files */export class EtaEngine implements Engine {  engine: Eta;  filters: Record<string, Helper> = {};  basePath: string;
  constructor(engine: Eta, basePath: string) {    this.engine = engine;    this.basePath = basePath;  }
  deleteCache(file: string): void {    const path = posix.join(this.basePath, file);    this.engine.templatesSync.remove(path);    this.engine.templatesAsync.remove(path);  }
  render(content: string, data: Data, filename: string) {    const template = this.getTemplate(content, filename, true);
    data.filters = this.filters;    return this.engine.renderAsync(template, data, { filepath: filename });  }
  renderSync(content: string, data: Data, filename: string): string {    const template = this.getTemplate(content, filename, false);
    data.filters = this.filters;    return this.engine.render(template, data, { filepath: filename });  }
  getTemplate(content: string, filename: string, async?: boolean) {    filename = posix.join(this.basePath, filename);
    const templates = async      ? this.engine.templatesAsync      : this.engine.templatesSync;    if (!templates.get(filename)) {      templates.define(        filename,        this.engine.compile(          content,          { async },        ),      );    }    return templates.get(filename)!;  }
  addHelper(name: string, fn: Helper, options: HelperOptions) {    switch (options.type) {      case "filter":        this.filters[name] = fn;        return;    }  }}
/** Register the plugin to use Eta as a template engine */export default function (userOptions?: Partial<Options>) {  return (site: Site) => {    const options = merge(      { ...defaults, includes: site.options.includes },      userOptions,    );
    // Configure Eta    const eta = new Eta({      ...options.options,      views: site.src(options.includes),    });
    const extensions = Array.isArray(options.extensions)      ? { pages: options.extensions, components: options.extensions }      : options.extensions;
    const engine = new EtaEngine(eta, site.src());
    site.loadPages(extensions.pages, loader, engine);    site.includes(extensions.pages, options.includes);    site.includes(extensions.components, options.includes);    site.loadComponents(extensions.components, loader, engine);  };}