/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_loader_WorkerModuleLoader_h
#define mozilla_loader_WorkerModuleLoader_h

#include "js/loader/ModuleLoaderBase.h"
#include "mozilla/dom/SerializedStackHolder.h"
#include "mozilla/UniquePtr.h"

namespace mozilla::dom::workerinternals::loader {
class WorkerScriptLoader;

// alias common classes
using ScriptFetchOptions = JS::loader::ScriptFetchOptions;
using ScriptKind = JS::loader::ScriptKind;
using ScriptLoadRequest = JS::loader::ScriptLoadRequest;
using ScriptLoadRequestList = JS::loader::ScriptLoadRequestList;
using ModuleLoadRequest = JS::loader::ModuleLoadRequest;

// WorkerModuleLoader
//
// The WorkerModuleLoader provides the methods that implement specification
// step 5 from "To fetch a worklet/module worker script graph", specifically for
// workers. In addition, this implements worker specific initialization for
// Static imports and Dynamic imports.
//
// The steps are outlined in "To fetch the descendants of and link a module
// script" and are common for all Modules. Thus we delegate to ModuleLoaderBase
// for those steps.
class WorkerModuleLoader : public JS::loader::ModuleLoaderBase {
 public:
  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(WorkerModuleLoader,
                                           JS::loader::ModuleLoaderBase)

  WorkerModuleLoader(WorkerScriptLoader* aScriptLoader,
                     nsIGlobalObject* aGlobalObject,
                     nsISerialEventTarget* aEventTarget);

 private:
  ~WorkerModuleLoader() = default;

  bool CreateDynamicImportLoader();
  void SetScriptLoader(JS::loader::ScriptLoaderInterface* aLoader) {
    mLoader = aLoader;
  }
  void SetEventTarget(nsISerialEventTarget* aEventTarget) {
    mEventTarget = aEventTarget;
  }

  WorkerScriptLoader* GetCurrentScriptLoader();

  WorkerScriptLoader* GetScriptLoaderFor(ModuleLoadRequest* aRequest);

  nsIURI* GetBaseURI() const override;

  already_AddRefed<ModuleLoadRequest> CreateStaticImport(
      nsIURI* aURI, ModuleLoadRequest* aParent) override;

  already_AddRefed<ModuleLoadRequest> CreateDynamicImport(
      JSContext* aCx, nsIURI* aURI, LoadedScript* aMaybeActiveScript,
      JS::Handle<JS::Value> aReferencingPrivate,
      JS::Handle<JSString*> aSpecifier,
      JS::Handle<JSObject*> aPromise) override;

  bool CanStartLoad(ModuleLoadRequest* aRequest, nsresult* aRvOut) override;

  // StartFetch is special for worker modules, as we need to move back to the
  // main thread to start a new load.
  nsresult StartFetch(ModuleLoadRequest* aRequest) override;

  nsresult CompileFetchedModule(
      JSContext* aCx, JS::Handle<JSObject*> aGlobal,
      JS::CompileOptions& aOptions, ModuleLoadRequest* aRequest,
      JS::MutableHandle<JSObject*> aModuleScript) override;

  void OnModuleLoadComplete(ModuleLoadRequest* aRequest) override;

  bool IsModuleEvaluationAborted(ModuleLoadRequest* aRequest) override;
};

}  // namespace mozilla::dom::workerinternals::loader
#endif  // mozilla_loader_WorkerModuleLoader_h
