import { fileURLToPath } from 'url'

export function pathify(path: string): string {
  if (path.startsWith('file://')) {
    path = fileURLToPath(path)
  }
  return path
}

export function instantiateEmscriptenWasm<T extends EmscriptenWasm.Module>(
  factory: EmscriptenWasm.ModuleFactory<T>,
  path: string,
  workerJS: string = ''
): Promise<T> {
  return factory({
    locateFile(requestPath) {
      // The glue code generated by emscripten uses the original
      // file names of the worker file and the wasm binary.
      // These will have changed in the bundling process and
      // we need to inject them here.
      if (requestPath.endsWith('.wasm')) return pathify(path)
      if (requestPath.endsWith('.worker.js')) return pathify(workerJS)
      return requestPath
    },
  })
}