// Copyright (c) 2022 Microsoft, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "shell/services/node/node_service.h"

#include <sstream>
#include <utility>

#include "base/command_line.h"
#include "base/no_destructor.h"
#include "base/process/process.h"
#include "base/strings/utf_string_conversions.h"
#include "electron/fuses.h"
#include "electron/mas.h"
#include "net/base/network_change_notifier.h"
#include "services/network/public/cpp/wrapper_shared_url_loader_factory.h"
#include "services/network/public/mojom/host_resolver.mojom.h"
#include "services/network/public/mojom/network_context.mojom.h"
#include "shell/browser/javascript_environment.h"
#include "shell/common/api/electron_bindings.h"
#include "shell/common/gin_converters/file_path_converter.h"
#include "shell/common/gin_helper/dictionary.h"
#include "shell/common/node_bindings.h"
#include "shell/common/node_includes.h"
#include "shell/common/v8_util.h"
#include "shell/services/node/parent_port.h"

#if !IS_MAS_BUILD()
#include "shell/common/crash_keys.h"
#endif

namespace electron {

mojo::Remote<node::mojom::NodeServiceClient>& GetRemote() {
  static base::NoDestructor<mojo::Remote<node::mojom::NodeServiceClient>>
      instance;
  return *instance;
}

void V8FatalErrorCallback(const char* location, const char* message) {
  if (GetRemote().is_bound() && GetRemote().is_connected()) {
    auto* isolate = v8::Isolate::TryGetCurrent();
    std::ostringstream outstream;
    node::GetNodeReport(isolate, message, location,
                        v8::Local<v8::Object>() /* error */, outstream);
    GetRemote()->OnV8FatalError(location, outstream.str());
  }

#if !IS_MAS_BUILD()
  electron::crash_keys::SetCrashKey("electron.v8-fatal.message", message);
  electron::crash_keys::SetCrashKey("electron.v8-fatal.location", location);
#endif

  volatile int* zero = nullptr;
  *zero = 0;
}

URLLoaderBundle::URLLoaderBundle() = default;

URLLoaderBundle::~URLLoaderBundle() = default;

URLLoaderBundle* URLLoaderBundle::GetInstance() {
  static base::NoDestructor<URLLoaderBundle> instance;
  return instance.get();
}

void URLLoaderBundle::SetURLLoaderFactory(
    mojo::PendingRemote<network::mojom::URLLoaderFactory> pending_factory,
    mojo::Remote<network::mojom::HostResolver> host_resolver,
    bool use_network_observer_from_url_loader_factory) {
  factory_ = network::SharedURLLoaderFactory::Create(
      std::make_unique<network::WrapperPendingSharedURLLoaderFactory>(
          std::move(pending_factory)));
  host_resolver_ = std::move(host_resolver);
  should_use_network_observer_from_url_loader_factory_ =
      use_network_observer_from_url_loader_factory;
}

scoped_refptr<network::SharedURLLoaderFactory>
URLLoaderBundle::GetSharedURLLoaderFactory() {
  return factory_;
}

network::mojom::HostResolver* URLLoaderBundle::GetHostResolver() {
  DCHECK(host_resolver_);
  return host_resolver_.get();
}

bool URLLoaderBundle::ShouldUseNetworkObserverfromURLLoaderFactory() const {
  return should_use_network_observer_from_url_loader_factory_;
}

NodeService::NodeService(
    mojo::PendingReceiver<node::mojom::NodeService> receiver)
    : node_bindings_{NodeBindings::Create(
          NodeBindings::BrowserEnvironment::kUtility)},
      electron_bindings_{
          std::make_unique<ElectronBindings>(node_bindings_->uv_loop())} {
  if (receiver.is_valid())
    receiver_.Bind(std::move(receiver));
}

NodeService::~NodeService() {
  if (!node_env_stopped_) {
    node_env_->set_trace_sync_io(false);
    ParentPort::GetInstance()->Close();
    js_env_->DestroyMicrotasksRunner();
    node::Stop(node_env_.get(), node::StopFlags::kDoNotTerminateIsolate);
    GetRemote().reset();
  }
}

void NodeService::Initialize(
    node::mojom::NodeServiceParamsPtr params,
    mojo::PendingRemote<node::mojom::NodeServiceClient> client_pending_remote) {
  if (NodeBindings::IsInitialized())
    return;

  GetRemote().Bind(std::move(client_pending_remote));
  GetRemote().reset_on_disconnect();

  ParentPort::GetInstance()->Initialize(std::move(params->port));

  URLLoaderBundle::GetInstance()->SetURLLoaderFactory(
      std::move(params->url_loader_factory),
      mojo::Remote(std::move(params->host_resolver)),
      params->use_network_observer_from_url_loader_factory);

  js_env_ = std::make_unique<JavascriptEnvironment>(node_bindings_->uv_loop());

  v8::Isolate* const isolate = js_env_->isolate();
  v8::HandleScope scope{isolate};

  // Enable trap handlers before user script execution.
#if ((BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_WIN) || BUILDFLAG(IS_MAC)) && \
     defined(ARCH_CPU_X86_64)) ||                                       \
    ((BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC)) && defined(ARCH_CPU_ARM64))
  if (electron::fuses::IsWasmTrapHandlersEnabled()) {
    electron::SetUpWebAssemblyTrapHandler();
  }
#endif

  node_bindings_->Initialize(isolate, isolate->GetCurrentContext());

  network_change_notifier_ = net::NetworkChangeNotifier::CreateIfNeeded(
      net::NetworkChangeNotifier::CONNECTION_UNKNOWN,
      net::NetworkChangeNotifier::ConnectionSubtype::SUBTYPE_UNKNOWN);

  // Append program path for process.argv0
  auto program = base::CommandLine::ForCurrentProcess()->GetProgram();
#if defined(OS_WIN)
  params->args.insert(params->args.begin(), base::WideToUTF8(program.value()));
#else
  params->args.insert(params->args.begin(), program.value());
#endif

  // Create the global environment.
  node_env_ = node_bindings_->CreateEnvironment(
      isolate, isolate->GetCurrentContext(), js_env_->platform(),
      js_env_->max_young_generation_size_in_bytes(), params->args,
      params->exec_args);

  // Override the default handler set by NodeBindings.
  node_env_->isolate()->SetFatalErrorHandler(V8FatalErrorCallback);

  node::SetProcessExitHandler(
      node_env_.get(), [this](node::Environment* env, int exit_code) {
        // Destroy node platform.
        node_env_stopped_ = true;
        ParentPort::GetInstance()->Close();
        js_env_->DestroyMicrotasksRunner();
        GetRemote().reset();
        receiver_.ResetWithReason(exit_code, "process_exit_termination");
        node::DefaultProcessExitHandler(env, exit_code);
      });

  node_env_->set_trace_sync_io(node_env_->options()->trace_sync_io);

  // We do not want to crash the utility process on unhandled rejections.
  node_env_->options()->unhandled_rejections = "warn-with-error-code";

  // Add Electron extended APIs.
  electron_bindings_->BindTo(node_env_->isolate(), node_env_->process_object());

  // Add entry script to process object.
  gin_helper::Dictionary process(node_env_->isolate(),
                                 node_env_->process_object());
  process.SetHidden("_serviceStartupScript", params->script);

  // Setup microtask runner.
  js_env_->CreateMicrotasksRunner();

  // Wrap the uv loop with global env.
  node_bindings_->set_uv_env(node_env_.get());

  // LoadEnvironment should be called after setting up
  // JavaScriptEnvironment including the microtask runner
  // since this call will start compilation and execution
  // of the entry script. If there is an uncaught exception
  // the exit handler set above will be triggered and it expects
  // both Node Env and JavaScriptEnvironment are setup to perform
  // a clean shutdown of this process.
  node_bindings_->LoadEnvironment(node_env_.get());

  // Run entry script.
  node_bindings_->PrepareEmbedThread();
  node_bindings_->StartPolling();
}

}  // namespace electron
