// Copyright (c) 2019 The Chromium Embedded Framework Authors. Portions
// Copyright (c) 2018 The Chromium Authors. All rights reserved. Use of this
// source code is governed by a BSD-style license that can be found in the
// LICENSE file.

#include "cef/libcef/browser/net_service/url_loader_factory_getter.h"

#include "base/task/single_thread_task_runner.h"
#include "cef/libcef/browser/thread_util.h"
#include "cef/libcef/common/app_manager.h"
#include "content/browser/devtools/devtools_instrumentation.h"
#include "content/browser/renderer_host/render_frame_host_impl.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/common/content_client.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/cpp/wrapper_shared_url_loader_factory.h"

namespace net_service {

// Based on CreatePendingSharedURLLoaderFactory from
// content/browser/download/download_manager_impl.cc.
// static
scoped_refptr<URLLoaderFactoryGetter> URLLoaderFactoryGetter::Create(
    content::RenderFrameHost* render_frame_host,
    content::BrowserContext* browser_context) {
  CEF_REQUIRE_UIT();
  DCHECK(browser_context);

  // Call this early because newly created BrowserContexts may need to
  // initialize additional state, and that should be done on the UI thread
  // instead of potentially racing with the WillCreateURLLoaderFactory
  // implementation.
  auto loader_factory = browser_context->GetDefaultStoragePartition()
                            ->GetURLLoaderFactoryForBrowserProcess();

  network::URLLoaderFactoryBuilder factory_builder;

  int render_process_id = -1;

  if (render_frame_host) {
    render_process_id = render_frame_host->GetProcess()->GetID();

    // Allow DevTools to potentially inject itself into the proxy pipe.
    content::devtools_instrumentation::WillCreateURLLoaderFactoryParams::
        ForFrame(static_cast<content::RenderFrameHostImpl*>(render_frame_host))
            .Run(/*is_navigation=*/false, /*is_download=*/false,
                 factory_builder, /*factory_override=*/nullptr);
  }

  auto browser_client = CefAppManager::Get()->GetContentClient()->browser();

  // Allow the Content embedder to inject itself if it wants to.
  browser_client->WillCreateURLLoaderFactory(
      browser_context, render_frame_host, render_process_id,
      content::ContentBrowserClient::URLLoaderFactoryType::kDocumentSubResource,
      url::Origin(), net::IsolationInfo(), /*navigation_id=*/std::nullopt,
      ukm::SourceIdObj(), factory_builder, /*header_client=*/nullptr,
      /*bypass_redirect_checks=*/nullptr, /*disable_secure_dns=*/nullptr,
      /*factory_override=*/nullptr,
      /*navigation_response_task_runner=*/nullptr);

  return base::WrapRefCounted(new URLLoaderFactoryGetter(
      loader_factory->Clone(), std::move(factory_builder)));
}

// Based on CreateFactory from
// content/browser/download/network_download_pending_url_loader_factory.cc.
scoped_refptr<network::SharedURLLoaderFactory>
URLLoaderFactoryGetter::GetURLLoaderFactory() {
  // On first call we associate with the current thread.
  if (!task_runner_) {
    task_runner_ = base::SingleThreadTaskRunner::GetCurrentDefault();
  } else {
    DCHECK(task_runner_->RunsTasksInCurrentSequence());
  }

  if (lazy_factory_) {
    return lazy_factory_;
  }

  // Bind on the current thread.
  auto loader_factory =
      network::SharedURLLoaderFactory::Create(std::move(loader_factory_info_));

  lazy_factory_ = std::move(factory_builder_).Finish(loader_factory);
  return lazy_factory_;
}

URLLoaderFactoryGetter::URLLoaderFactoryGetter(
    std::unique_ptr<network::PendingSharedURLLoaderFactory> loader_factory_info,
    network::URLLoaderFactoryBuilder factory_builder)
    : loader_factory_info_(std::move(loader_factory_info)),
      factory_builder_(std::move(factory_builder)) {}

URLLoaderFactoryGetter::~URLLoaderFactoryGetter() = default;

void URLLoaderFactoryGetter::DeleteOnCorrectThread() const {
  if (task_runner_ && !task_runner_->RunsTasksInCurrentSequence()) {
    task_runner_->DeleteSoon(FROM_HERE, this);
    return;
  }
  delete this;
}

}  // namespace net_service