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import { Exception } from "./errors.ts";
import type { Engine, Loader } from "../core.ts";
export interface Format {  /** The file loader used for this format */  pageLoader?: Loader;
  /** Loader for _data files in this format */  dataLoader?: Loader;
  /** Loader for _components files in this format */  componentLoader?: Loader;
  /**   * The template engine used to render this format   * Used to render the page and components   */  engine?: Engine;
  /**   * This is used to distinguish between pages that output html files (like index.njk -> index.html)   * and pages that output assets (like styles.css -> styles.css).   */  asset?: boolean;
  /** A custom path for includes */  includesPath?: string;
  /** Whether this file must be copied instead loaded */  copy?: boolean | ((path: string) => string);}
/** Class to store loaders, engines and other stuff related with different formats */export default class Formats {  entries = new Map<string, Format>();
  get size(): number {    return this.entries.size;  }
  /** Assign a value to a extension */  set(extension: string, format: Format): void {    const existing = this.entries.get(extension);
    if (existing) {      this.entries.set(extension, { ...existing, ...format });      return;    }
    // Simple extension (.ts, .js, .json)    if (extension.match(/^\.\w+$/)) {      this.entries.set(extension, format);      return;    }
    // Chained extension (.tmpl.js, .windi.css) goes first    if (extension.match(/^\.\w+\.\w+$/)) {      const entries = Array.from(this.entries.entries());      entries.unshift([extension, format]);      this.entries = new Map(entries);      return;    }
    throw new Exception(      "Invalid extension. It must start with '.'",      { extension },    );  }
  /** Returns a format by extension */  get(extension: string): Format | undefined {    return this.entries.get(extension);  }
  /** Delete a format */  delete(extension: string): void {    this.entries.delete(extension);  }
  /** Returns if a format exists */  has(extension: string): boolean {    return this.entries.has(extension);  }
  /** Search and return a [extension, format] pair for a path */  search(path: string): [string, Format] | undefined {    for (const [extension, value] of this.entries) {      if (path.endsWith(extension)) {        return [extension, value];      }    }  }
  /** Delete a cached template */  deleteCache(file: string): void {    for (const format of this.formats()) {      format.engine?.deleteCache(file);    }  }
  /** Return a iterator for the formats */  formats() {    return this.entries.values();  }
  /** Return a iterator for the extensions */  extensions() {    return this.entries.keys();  }}