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import { isUrl, normalizePath } from "../core/utils/path.ts";import { merge } from "../core/utils/object.ts";import { log } from "../core/utils/log.ts";import { read } from "../core/utils/read.ts";import { concurrent } from "../core/utils/concurrent.ts";import { encodeBase64 } from "../deps/base64.ts";import { Page } from "../core/file.ts";import { basename, join, toFileUrl } from "../deps/path.ts";
import type Site from "../core/site.ts";
export interface Options {  /** Set true to inline the source map in the output file */  inline?: boolean;
  /** Set true to include the content of the source files */  sourceContent?: boolean;}
export const defaults: Options = {  inline: false,  sourceContent: false,};
/** Generate the source map files of assets */export default function (userOptions?: Options) {  const options = merge(defaults, userOptions);
  return (site: Site) => {    site._data.enableSourceMap = true;
    site.process(      "*",      (pages, allPages) =>        concurrent(pages, (page) => processSourceMap(page, allPages)),    );
    async function processSourceMap(file: Page, files: Page[]) {      const sourceMap = file.data.sourceMap as SourceMap | undefined;      file.data.sourceMap = undefined;
      if (!sourceMap) {        return;      }
      // Add the content of the source files      try {        if (options.sourceContent) {          sourceMap.sourcesContent = await Promise.all(            sourceMap.sources.map((url: string) => {              const content = sourceMap[dynamicSourcesSymbol]?.[url];
              return content ? content : read(url, false);            }),          );        }      } catch (err) {        log.error(`${err.message}\n${sourceMap.sources.join("\n")}`);      }
      // Relative paths (eg. "../bar") look better in the dev-tools.      sourceMap.sourceRoot = toFileUrl(site.root()).href;      sourceMap.sources = sourceMap.sources.map((url: string) =>        url.replace(sourceMap.sourceRoot!, "")      );
      // Inline the source map in the output file      if (options.inline) {        const url = `data:application/json;charset=utf-8;base64,${          encodeBase64(JSON.stringify(sourceMap))        }`;        file.content += addSourceMap(file.outputPath, url);        return;      }
      // Create a source map file      const url = file.outputPath + ".map";      sourceMap.file = url;      file.content += addSourceMap(file.outputPath, `./${basename(url)}`);      files.push(Page.create({ url, content: JSON.stringify(sourceMap) }));    }  };}
/** Utilities to use by other plugins to manage source maps */export const dynamicSourcesSymbol = Symbol.for("dynamicSources");
/** SourceMap with a property to store dynamic sources */export interface SourceMap {  version: number;  file?: string;  sources: readonly string[];  sourceRoot?: string;  sourcesContent?: readonly (string | null)[];  names: readonly string[];  mappings: string;  [dynamicSourcesSymbol]?: Record<string, string>;}
export interface PrepareResult {  content: string;  sourceMap?: SourceMap;  filename: string;  enableSourceMap: boolean;}
/** Return the required info to process a file */export function prepareAsset(site: Site, page: Page): PrepareResult {  const enableSourceMap = !!site._data.enableSourceMap;  const content = page.content as string;  const sourceMap = enableSourceMap    ? page.data.sourceMap as SourceMap | undefined    : undefined;  const filename = page.src.path    ? site.src(page.src.path + page.src.ext)    : site.src(page.outputPath);  return { content, sourceMap, filename, enableSourceMap };}
/** Save the process result */export function saveAsset(  site: Site,  page: Page,  content: string,  sourceMap?: SourceMap | string,) {  if (!site._data.enableSourceMap) {    sourceMap = undefined;  }
  // There's no source map  if (!sourceMap) {    page.content = content;    return;  }
  const root = site.root();
  // Ensure the sourceMap is an object  if (typeof sourceMap === "string") {    sourceMap = JSON.parse(sourceMap) as SourceMap;  }
  // Normalize any source url  function normalizeSource(source: string): string {    if (source.startsWith("deno:")) { // esbuild      source = source.substring(5);    }    if (isUrl(source)) {      return source;    }
    source = normalizePath(source);
    return source.startsWith(root)      ? toFileUrl(decodeURIComponent(source)).href      : toFileUrl(decodeURIComponent(join(root, source))).href;  }
  sourceMap.sources = sourceMap.sources    .filter((source: string) => source !== "<no source>") // tailwindcss    .map(normalizeSource);
  // Inherit the dynamic sources from the previous source map  const previousSourceMap = page.data.sourceMap as SourceMap | undefined;  if (previousSourceMap) {    sourceMap[dynamicSourcesSymbol] = previousSourceMap[dynamicSourcesSymbol];  }
  // If it's a dynamic source (not from the file system), store it in the source map  if (!page.src.path) {    const sources = sourceMap[dynamicSourcesSymbol] || {};    const file = normalizeSource(site.src(page.outputPath));    sourceMap[dynamicSourcesSymbol] = sources;
    if (!sources[file]) {      sources[file] = page.content as string;    }  }
  // Store the new content and source map  page.data.sourceMap = sourceMap;  page.content = content;}
function addSourceMap(url: string, sourceMap: string): string {  if (url.endsWith(".js")) {    return `\n//# sourceMappingURL=${sourceMap}`;  }
  // It's CSS  return `\n/*# sourceMappingURL=${sourceMap} */`;}
/** Extends Data interface */declare global {  namespace Lume {    export interface Data {      /**       * The source map data (if it's an asset)       * @see https://lume.land/plugins/source_maps/       */      sourceMap?: SourceMap;    }  }}