import * as ESBuild from "https://deno.land/x/esbuild@v0.25.0/wasm.js";
import * as Mapper from "https://esm.sh/esbuild-plugin-importmaps@1.0.0"; // https://github.com/andstellar/esbuild-plugin-importmaps
import Introspect from "./introspect.ts";


const prefix = "/_dot_importer_/";
const resolvePlugin =(fullPathDir:string):ESBuild.Plugin=>({
  name: "resolve-plugin",
  setup(build) {

    build.onResolve({ /*path relative*/ filter: /^(\.\/|\.\.\/).*/ }, (args)=>
    {
      let resolveRoot = args.importer||fullPathDir;
      if(resolveRoot.startsWith(prefix))
      {
        resolveRoot = resolveRoot.substring(prefix.length);
      }

      const url = new URL(args.path, resolveRoot).href;
      const output:ESBuild.OnResolveResult = {
        path:prefix + url,
        namespace:"local",
      }
      console.log(`LOCAL RESOLVE`, {args, resolveRoot, output}, "\n");
      return output;
    });
    build.onLoad({ /*wildcard*/ filter: /.*/, namespace:"local" }, async(args)=> {

      const fetchPath = args.path.substring(prefix.length);

      console.log(`LOCAL LOADING`, {args, fetchPath}, "\n");

      const contents = await fetch(fetchPath).then(r=>r.text());

      return { contents, loader: `tsx` };
    });


    build.onResolve({/* path abs */ filter:/^\/.*/}, args=>{
      console.log(`ABS RESOLVE`, {args}, "\n");

      return {
        path:args.path,
        namespace:"ABS",
      }
    });
    build.onLoad({/*wildcard*/ filter: /.*/, namespace:"ABS"}, async(args)=>{
      console.log(`ABS LOADING`, {args}, "\n");
      return { contents:"export default 'IDK';", loader: `tsx` };
    });


    build.onResolve({ /* path HTTP */ filter: /^https?:\/\// }, args => {
      console.log(`REMOTE RESOLVE`, args);
      return { path: args.path, namespace:"REMOTE", pluginData:{origin:new URL(args.path).origin} };
    });
    build.onLoad({ /*wildcard*/ filter: /.*/, namespace:"REMOTE" }, async(args)=> {
      console.log(`REMOTE LOADING`, {args}, "\n");

      const contents = await fetch(args.path).then(r=>r.text());

      return { contents, loader: `tsx` };
    });


  },
});

await ESBuild.initialize({ worker: false });
export type ImportMap = Parameters<typeof Mapper.importmapPlugin>[0];
export type BuildOptions = ESBuild.BuildOptions;

/**
 * 
 * @param {string} directory Full file:// or http(s):// path to the directory containing assets you want to build (needed to resolve relative imports)
 * @param {ESBuild.BuildOptions} buildOptions ESBuild "build" options (will be merged with "reasonable defaults") for docs: https://esbuild.github.io/api/#general-options
 * @param {ImportMap|null} importMap An object to act as the import map ({imports:Record<string, string>}). If this is left blank, a configuration will be scanned for in the "directory"
 * @returns {Promise<ESBuild.BuildResult<ESBuild.BuildOptions>>} build result
 */
export default async function(directory, buildOptions={}, importMap)
{
  if(!importMap)
  {
    importMap = await Introspect(directory) as ImportMap
  }
  console.log("using import map", importMap);
  const configuration:ESBuild.BuildOptions = {
    entryPoints: ["entry"],
    bundle: true,
    minify: true,
    format: "esm",
    jsx: "automatic",
    jsxImportSource: "react",
    ...buildOptions,
    plugins: [
      resolvePlugin(directory),
      //Mapper.importmapPlugin(importMap) as ESBuild.Plugin,
      ...buildOptions.plugins||[]
    ]
  };

  const result = await ESBuild.build(configuration);
  return result;
}
export { ESBuild };