import path from 'path';
import { Plugin } from 'esbuild';

// Copied from https://github.com/evanw/esbuild/issues/1051#issuecomment-806325487
export const nativeNodeModulesPlugin = (): Plugin => {
  return {
    name: 'native-node-modules',
    setup(build) {
      // If a ".node" file is imported within a module in the "file" namespace, resolve
      // it to an absolute path and put it into the "node-file" virtual namespace.
      build.onResolve({ filter: /\.node$/, namespace: 'file' }, (args) => {
        const resolvedId = require.resolve(args.path, {
          paths: [args.resolveDir],
        });
        if (resolvedId.endsWith('.node')) {
          return {
            path: resolvedId,
            namespace: 'node-file',
          };
        }
        return {
          path: resolvedId,
        };
      });

      // Files in the "node-file" virtual namespace call "require()" on the
      // path from esbuild of the ".node" file in the output directory.
      build.onLoad({ filter: /.*/, namespace: 'node-file' }, (args) => {
        return {
          contents: `
            import path from ${JSON.stringify(args.path)}
            try { module.exports = require(path) }
            catch {}
          `,
          resolveDir: path.dirname(args.path),
        };
      });

      // If a ".node" file is imported within a module in the "node-file" namespace, put
      // it in the "file" namespace where esbuild's default loading behavior will handle
      // it. It is already an absolute path since we resolved it to one above.
      build.onResolve(
        { filter: /\.node$/, namespace: 'node-file' },
        (args) => ({
          path: args.path,
          namespace: 'file',
        }),
      );

      // Tell esbuild's default loading behavior to use the "file" loader for
      // these ".node" files.
      const opts = build.initialOptions;
      opts.loader = opts.loader || {};
      opts.loader['.node'] = 'file';
    },
  };
};