import FileHound from 'filehound';
import fs from 'fs';

const files = FileHound.create().paths('./lib').ext(['js', 'ts']).find();

files.then((filePaths) => {
  filePaths.forEach((filepath) => {
    fs.readFile(filepath, 'utf8', (err, text) => {
      if (!text.match(/import .* from/g)) {
        return;
      }
      text = text.replace(/(import .* from\s+['"])(.*)(?=['"])/g, '$1$2.js');
      if (text.match(/export .* from/g)) {
        text = text.replace(/(export .* from\s+['"])(.*)(?=['"])/g, '$1$2.js');
      }

      if (err) throw err;

      // stupid replacement back
      text = text.replace(
        "import * as Canvas from 'canvas.js';",
        "import * as Canvas from 'canvas';"
      );

      // Handle import("./x/y/z") syntax.
      text = text.replace(/(import\s*\(\s*['"])(.*)(?=['"])/g, '$1$2.js');

      fs.writeFile(filepath, text, function (err) {
        if (err) {
          throw err;
        }
      });
    });
  });
});

const indexFiles = ['lib/index.js', 'lib/index-node.js', 'lib/Core.js'];
indexFiles.forEach((filepath) => {
  fs.readFile(filepath, 'utf8', (err, text) => {
    text = text.replace('exports.default =', 'module.exports =');
    fs.writeFile(filepath, text, function (err) {
      if (err) {
        throw err;
      }
    });
  });
});