const assetRoot = '/static/piper-wasm-v1/onnx/';

export function createOnnxWasmPaths(origin) {
  const absoluteAssetRoot = new URL(assetRoot, origin).href;
  return absoluteAssetRoot;
}

export function configureOnnxRuntime(onnxRuntime) {
  if (!onnxRuntime?.env?.wasm) throw new TypeError('ONNX Runtime WebAssembly settings are unavailable.');
  // Piper 1.0.3 overwrites this value in TtsSession.init() with
  // navigator.hardwareConcurrency. Override that source as well, otherwise an
  // iPad may start a large WASM worker pool despite this setting.
  const navigatorObject = globalThis.navigator;
  if (navigatorObject && navigatorObject.hardwareConcurrency !== 1) {
    try {
      Object.defineProperty(navigatorObject, 'hardwareConcurrency', {
        configurable: true,
        value: 1,
      });
    } catch (_) {
      // The check below converts an unsupported override into a clear error.
    }
  }
  if (navigatorObject && navigatorObject.hardwareConcurrency !== 1) {
    throw new Error('Piper could not be restricted to one processor thread.');
  }
  // Piper already runs in a worker. Avoid a second worker pool on mobile Safari.
  onnxRuntime.env.wasm.numThreads = 1;
  onnxRuntime.env.wasm.initTimeout = 60000;
}