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import { file } from "bun";
import * as esbuild from "esbuild";
import { readdir } from "node:fs/promises";

export interface ThirdPartyInfo {
  licenseText: string;

  thirdPartyCounts: number;
  includedLicenseFileCounts: number;
}

export async function buildThirdPartyLicense(
  meta: esbuild.Metafile,
): Promise<ThirdPartyInfo | null> {
  const nmPat = /^node_modules\/([^/]+)\/([^/]+)/;

  const libs = Object.values(meta.inputs)
    .flatMap((output) => output.imports)
    .map((mod) => {
      const match = mod.path.match(nmPat);
      if (!match) {
        return null;
      }

      const [, s1, s2] = match;

      if (s1.startsWith("@")) {
        return {
          scope: s1,
          name: s2,
        };
      }

      return {
        scope: null,
        name: s1,
      };
    })
    .filter(
      (mod, i, mods): mod is NonNullable<typeof mod> =>
        !!mod &&
        mods.findIndex((x) => x?.name === mod.name && x.scope === mod.scope) ===
          i,
    );

  const nmPath = new URL("../../node_modules/", import.meta.url);
  const licensePat = /^license(\.txt)?$/i;

  // TODO: Also check for NOTICE file
  const licenseFiles = await Promise.all(
    libs.map(async (pkg) => {
      const packagePath = new URL(
        pkg.scope ? `${pkg.scope}/${pkg.name}/` : pkg.name + "/",
        nmPath,
      );

      for (const entry of await readdir(packagePath, { withFileTypes: true })) {
        if (entry.isFile() && licensePat.test(entry.name)) {
          return file(new URL(entry.name, packagePath)).text();
        }
      }

      return null;
    }),
  );

  const deduped = licenseFiles.filter(
    (text, i, texts) => text && texts.indexOf(text) === i,
  );

  if (!deduped.length) {
    return null;
  }

  return {
    licenseText: deduped.join("\n\n===\n\n"),
    thirdPartyCounts: libs.length,
    includedLicenseFileCounts: deduped.length,
  };
}