import fs from 'fs';
import JoyCon from 'joycon';
import { parse } from 'jsonc-parser';

const joycon = new JoyCon();

joycon.addLoader({
  test: /\.json$/,
  loadSync: (file: any) => {
    const content = fs.readFileSync(file, 'utf8');
    return parse(content);
  },
});

export const getOptions = (
  cwd: string
): { jsxFactory?: string; jsxFragment?: string; target?: string } => {
  const { data, path } = joycon.loadSync(['tsconfig.json'], cwd);
  if (path && data) {
    return {
      jsxFactory: data.compilerOptions?.jsxFactory,
      jsxFragment: data.compilerOptions?.jsxFragmentFactory,
      target: data.compilerOptions?.target,
    };
  }
  return {};
};

export const inferPackageFormat = (
  cwd: string,
  filename: string
): 'esm' | 'cjs' => {
  if (filename.endsWith('.mjs')) {
    return 'esm';
  }
  if (filename.endsWith('.cjs')) {
    return 'cjs';
  }
  const { data } = joycon.loadSync(['package.json'], cwd);
  return data && data.type === 'module' ? 'esm' : 'cjs';
};