// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/loader/cached_navigation_url_loader.h"

#include "content/browser/loader/navigation_early_hints_manager.h"
#include "content/browser/loader/navigation_url_loader_delegate.h"
#include "content/browser/loader/navigation_url_loader_impl.h"
#include "content/browser/navigation_subresource_loader_params.h"
#include "content/browser/renderer_host/navigation_request_info.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/global_request_id.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/web_contents.h"
#include "services/network/public/mojom/parsed_headers.mojom.h"

namespace content {

CachedNavigationURLLoader::CachedNavigationURLLoader(
    LoaderType loader_type,
    std::unique_ptr<NavigationRequestInfo> request_info,
    NavigationURLLoaderDelegate* delegate,
    network::mojom::URLResponseHeadPtr cached_response_head)
    : loader_type_(loader_type),
      request_info_(std::move(request_info)),
      delegate_(delegate),
      cached_response_head_(std::move(cached_response_head)) {}

void CachedNavigationURLLoader::OnResponseStarted() {
  GlobalRequestID global_id = GlobalRequestID::MakeBrowserInitiated();

  DCHECK(cached_response_head_);
  delegate_->OnResponseStarted(
      /*url_loader_client_endpoints=*/nullptr, std::move(cached_response_head_),
      /*response_body=*/mojo::ScopedDataPipeConsumerHandle(), global_id,
      /*is_download=*/false,
      request_info_->isolation_info.network_anonymization_key(),
      SubresourceLoaderParams(),
      /*early_hints=*/{});
}
CachedNavigationURLLoader::~CachedNavigationURLLoader() {}

// static
std::unique_ptr<NavigationURLLoader> CachedNavigationURLLoader::Create(
    LoaderType loader_type,
    std::unique_ptr<NavigationRequestInfo> request_info,
    NavigationURLLoaderDelegate* delegate,
    network::mojom::URLResponseHeadPtr cached_response_head) {
  return std::make_unique<CachedNavigationURLLoader>(
      loader_type, std::move(request_info), delegate,
      std::move(cached_response_head));
}

void CachedNavigationURLLoader::Start() {
  // Respond with a fake response.
  switch (loader_type_) {
    case LoaderType::kRegular:
      NOTREACHED();
    case LoaderType::kNoopForBackForwardCache:
      // We use PostTask here to mimic the flow of a normal navigation.
      //
      // Normal navigations never call OnResponseStarted on the same message
      // loop iteration that the NavigationURLLoader is created, because they
      // have to make a network request.
      //
      // TODO(crbug.com/40188852): Remove this post task and
      // synchronously run the loader like kNoopForPrerender.
      GetUIThreadTaskRunner({})->PostTask(
          FROM_HERE,
          base::BindOnce(&CachedNavigationURLLoader::OnResponseStarted,
                         weak_factory_.GetWeakPtr()));
      break;
    case LoaderType::kNoopForPrerender:
      // Call OnResponseStarted() synchronously. Prerendered page activation
      // synchronously runs so that it doesn't have to worry about cases where
      // cancellation is requested during page activation.
      OnResponseStarted();
      break;
  }
}

void CachedNavigationURLLoader::FollowRedirect(
    std::vector<std::string> removed_headers,
    net::HttpRequestHeaders modified_headers,
    net::HttpRequestHeaders modified_cors_exempt_headers) {
  NOTREACHED();
}

bool CachedNavigationURLLoader::SetNavigationTimeout(base::TimeDelta timeout) {
  // `false` here means that no timeout was started.
  return false;
}

void CachedNavigationURLLoader::CancelNavigationTimeout() {
  NOTREACHED();
}

}  // namespace content