import 'vendor/tinygo'

const go = new Go();

go.importObject.env['main.defineClass'] = function(namePtr, nameLen, cPtr, cGcPtr, pPtr/*, pGcPtr*/) {
  const mem = new DataView(go._inst.exports.memory.buffer)
  const decoder = new TextDecoder("utf-8");

  const name = decoder.decode(new DataView(go._inst.exports.memory.buffer, namePtr, nameLen));
  const constructorID = mem.getUint32(cPtr, true)
  const constructor = go._values[constructorID]

  const prototypeID = mem.getUint32(pPtr, true)
  const prototypes = go._values[prototypeID]

  window[name] = (new Function(
    'constructor', 'prototypes',
    `
      function ${name}() {
        if(!(this instanceof ${name})) {
          throw new TypeError("Cannot call a class as a function")
        }

        return constructor.apply(this, arguments)
      }

      prototypes.call(${name}.prototype)

      return ${name}
    `
  ))(constructor, prototypes);
}

WebAssembly
  .instantiateStreaming(
    fetch(require('./main.wasm')),
    go.importObject,
  )
  .then(result => {
    go.run(result.instance);
  });