/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_SERVICE_WORKER_SERVICE_WORKER_GLOBAL_SCOPE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_SERVICE_WORKER_SERVICE_WORKER_GLOBAL_SCOPE_H_

#include <memory>
#include "third_party/blink/public/mojom/cache_storage/cache_storage.mojom-blink.h"
#include "third_party/blink/public/mojom/service_worker/service_worker.mojom-blink.h"
#include "third_party/blink/renderer/bindings/core/v8/request_or_usv_string.h"
#include "third_party/blink/renderer/core/workers/worker_global_scope.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"

namespace blink {

class ExceptionState;
class RespondWithObserver;
class RequestInit;
class ScriptPromise;
class ScriptState;
class ServiceWorker;
class ServiceWorkerClients;
class ServiceWorkerRegistration;
class ServiceWorkerThread;
class StringOrTrustedScriptURL;
class WaitUntilObserver;
struct GlobalScopeCreationParams;
struct WebServiceWorkerObjectInfo;
struct WebServiceWorkerRegistrationObjectInfo;

typedef RequestOrUSVString RequestInfo;

class MODULES_EXPORT ServiceWorkerGlobalScope final : public WorkerGlobalScope {
  DEFINE_WRAPPERTYPEINFO();

 public:
  static ServiceWorkerGlobalScope* Create(
      ServiceWorkerThread*,
      std::unique_ptr<GlobalScopeCreationParams>,
      mojom::blink::CacheStoragePtrInfo,
      base::TimeTicks time_origin);

  ServiceWorkerGlobalScope(std::unique_ptr<GlobalScopeCreationParams>,
                           ServiceWorkerThread*,
                           mojom::blink::CacheStoragePtrInfo,
                           base::TimeTicks time_origin);
  ~ServiceWorkerGlobalScope() override;

  // ExecutionContext overrides:
  bool IsServiceWorkerGlobalScope() const override { return true; }
  bool ShouldInstallV8Extensions() const final;

  // Implements WorkerGlobalScope.
  void ImportModuleScript(
      const KURL& module_url_record,
      FetchClientSettingsObjectSnapshot* outside_settings_object,
      network::mojom::FetchCredentialsMode) override;
  void Dispose() override;

  // Counts an evaluated script and its size. Called for the main worker script.
  void CountWorkerScript(size_t script_size, size_t cached_metadata_size);

  // Counts an evaluated script and its size. Called for each of imported
  // scripts.
  void CountImportedScript(size_t script_size, size_t cached_metadata_size);

  // Called when the main worker script is evaluated.
  void DidEvaluateScript();

  // ServiceWorkerGlobalScope.idl
  ServiceWorkerClients* clients();
  ServiceWorkerRegistration* registration();

  ScriptPromise fetch(ScriptState*,
                      const RequestInfo&,
                      const RequestInit*,
                      ExceptionState&);

  ScriptPromise skipWaiting(ScriptState*);

  void BindServiceWorkerHost(mojom::blink::ServiceWorkerHostAssociatedPtrInfo);

  void SetRegistration(WebServiceWorkerRegistrationObjectInfo info);

  // Returns the ServiceWorker object described by the given info. Creates a new
  // object if needed, or else returns the existing one.
  ServiceWorker* GetOrCreateServiceWorker(WebServiceWorkerObjectInfo);

  // EventTarget
  const AtomicString& InterfaceName() const override;

  void DispatchExtendableEvent(Event*, WaitUntilObserver*);

  // For ExtendableEvents that also have a respondWith() function.
  void DispatchExtendableEventWithRespondWith(Event*,
                                              WaitUntilObserver*,
                                              RespondWithObserver*);

  bool IsInstalling() const { return is_installing_; }
  void SetIsInstalling(bool is_installing);

  // Script evaluation does not start until this function is called.
  void ReadyToEvaluateScript();

  void CountCacheStorageInstalledScript(uint64_t script_size,
                                        uint64_t script_metadata_size);

  mojom::blink::CacheStoragePtrInfo TakeCacheStorage();

  // See the functions of the same name in WebServiceWorkerContextClient.
  int WillStartTask();
  void DidEndTask(int task_id);

  DEFINE_ATTRIBUTE_EVENT_LISTENER(install, kInstall);
  DEFINE_ATTRIBUTE_EVENT_LISTENER(activate, kActivate);
  DEFINE_ATTRIBUTE_EVENT_LISTENER(fetch, kFetch);
  DEFINE_ATTRIBUTE_EVENT_LISTENER(message, kMessage);

  void Trace(blink::Visitor*) override;

 protected:
  // EventTarget
  bool AddEventListenerInternal(
      const AtomicString& event_type,
      EventListener*,
      const AddEventListenerOptionsResolved*) override;

  // WorkerGlobalScope
  void EvaluateClassicScriptInternal(
      const KURL& script_url,
      String source_code,
      std::unique_ptr<Vector<char>> cached_meta_data) override;

 private:
  void importScripts(const HeapVector<StringOrTrustedScriptURL>& urls,
                     ExceptionState&) override;
  SingleCachedMetadataHandler* CreateWorkerScriptCachedMetadataHandler(
      const KURL& script_url,
      const Vector<char>* meta_data) override;
  void ExceptionThrown(ErrorEvent*) override;

  // Counts the |script_size| and |cached_metadata_size| for UMA to measure the
  // number of scripts and the total bytes of scripts.
  void CountScriptInternal(size_t script_size, size_t cached_metadata_size);

  Member<ServiceWorkerClients> clients_;
  Member<ServiceWorkerRegistration> registration_;
  // Map from service worker version id to JavaScript ServiceWorker object in
  // current execution context.
  HeapHashMap<int64_t,
              WeakMember<ServiceWorker>,
              WTF::IntHash<int64_t>,
              WTF::UnsignedWithZeroKeyHashTraits<int64_t>>
      service_worker_objects_;
  bool did_evaluate_script_ = false;
  size_t script_count_ = 0;
  size_t script_total_size_ = 0;
  size_t script_cached_metadata_total_size_ = 0;
  bool is_installing_ = false;
  size_t cache_storage_installed_script_count_ = 0;
  uint64_t cache_storage_installed_script_total_size_ = 0;
  uint64_t cache_storage_installed_script_metadata_total_size_ = 0;

  bool evaluate_script_ready_ = false;
  base::OnceClosure evaluate_script_;

  // May be provided in the constructor as an optimization so InterfaceProvider
  // doesn't need to be used. Taken at the initial call to
  // ServiceWorkerGlobalScope#caches.
  mojom::blink::CacheStoragePtrInfo cache_storage_info_;
};

template <>
struct DowncastTraits<ServiceWorkerGlobalScope> {
  static bool AllowFrom(const ExecutionContext& context) {
    return context.IsServiceWorkerGlobalScope();
  }
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_SERVICE_WORKER_SERVICE_WORKER_GLOBAL_SCOPE_H_