// Copyright 2012 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/public/common/content_client.h"

#include <algorithm>
#include <string_view>

#include "base/feature_list.h"
#include "base/memory/ref_counted_memory.h"
#include "base/metrics/histogram_functions.h"
#include "base/no_destructor.h"
#include "base/notimplemented.h"
#include "base/strings/string_split.h"
#include "base/strings/string_view_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/sequenced_task_runner.h"
#include "base/values.h"
#include "build/build_config.h"
#include "content/public/common/content_features.h"
#include "content/public/common/origin_util.h"
#include "ui/gfx/image/image.h"

namespace content {

static ContentClient* g_client;

static bool g_can_change_browser_client = true;

class InternalTestInitializer {
 public:
  static ContentBrowserClient* SetBrowser(ContentBrowserClient* b) {
    CHECK(g_can_change_browser_client)
        << "The wrong ContentBrowserClient subclass is being used. In "
           "content_browsertests, subclass "
           "ContentBrowserTestContentBrowserClient.";
    ContentBrowserClient* rv = g_client->browser_;
    g_client->browser_ = b;
    return rv;
  }

  static ContentRendererClient* SetRenderer(ContentRendererClient* r) {
    ContentRendererClient* rv = g_client->renderer_;
    g_client->renderer_ = r;
    return rv;
  }

  static ContentUtilityClient* SetUtility(ContentUtilityClient* u) {
    ContentUtilityClient* rv = g_client->utility_;
    g_client->utility_ = u;
    return rv;
  }
};

// static
void ContentClient::SetCanChangeContentBrowserClientForTesting(bool value) {
  g_can_change_browser_client = value;
}

// static
void ContentClient::SetBrowserClientAlwaysAllowForTesting(
    ContentBrowserClient* b) {
  bool old = g_can_change_browser_client;
  g_can_change_browser_client = true;
  SetBrowserClientForTesting(b);  // IN-TEST
  g_can_change_browser_client = old;
}

void SetContentClient(ContentClient* client) {
  g_client = client;
}

ContentClient* GetContentClient() {
  return g_client;
}

ContentClient* GetContentClientForTesting() {
  return g_client;
}

ContentBrowserClient* SetBrowserClientForTesting(ContentBrowserClient* b) {
  return InternalTestInitializer::SetBrowser(b);
}

ContentRendererClient* SetRendererClientForTesting(ContentRendererClient* r) {
  return InternalTestInitializer::SetRenderer(r);
}

ContentUtilityClient* SetUtilityClientForTesting(ContentUtilityClient* u) {
  return InternalTestInitializer::SetUtility(u);
}

ContentClient::Schemes::Schemes() = default;
ContentClient::Schemes::~Schemes() = default;

ContentClient::ContentClient()
    : browser_(nullptr), gpu_(nullptr), renderer_(nullptr), utility_(nullptr) {}

ContentClient::~ContentClient() {
}

std::u16string ContentClient::GetLocalizedString(int message_id) {
  return std::u16string();
}

std::u16string ContentClient::GetLocalizedString(
    int message_id,
    const std::u16string& replacement) {
  return std::u16string();
}

bool ContentClient::HasDataResource(int resource_id) const {
  return false;
}

std::string_view ContentClient::GetDataResource(
    int resource_id,
    ui::ResourceScaleFactor scale_factor) {
  return std::string_view();
}

scoped_refptr<base::RefCountedMemory> ContentClient::GetDataResourceBytes(
    int resource_id) {
  return nullptr;
}

std::string ContentClient::GetDataResourceString(int resource_id) {
  // Default implementation in terms of GetDataResourceBytes.
  scoped_refptr<base::RefCountedMemory> memory =
      GetDataResourceBytes(resource_id);
  if (!memory)
    return std::string();
  return std::string(base::as_string_view(*memory));
}

gfx::Image& ContentClient::GetNativeImageNamed(int resource_id) {
  static base::NoDestructor<gfx::Image> kEmptyImage;
  return *kEmptyImage;
}

std::string ContentClient::GetProcessTypeNameInEnglish(int type) {
  NOTIMPLEMENTED();
  return std::string();
}

blink::OriginTrialPolicy* ContentClient::GetOriginTrialPolicy() {
  return nullptr;
}

#if BUILDFLAG(IS_ANDROID)
bool ContentClient::UsingSynchronousCompositing() {
  return false;
}

media::MediaDrmBridgeClient* ContentClient::GetMediaDrmBridgeClient() {
  return nullptr;
}
#endif  // BUILDFLAG(IS_ANDROID)

void ContentClient::ExposeInterfacesToBrowser(
    scoped_refptr<base::SequencedTaskRunner> io_task_runner,
    mojo::BinderMap* binders) {}

bool ContentClient::ShouldAllowDefaultSiteInstanceGroup() {
  return true;
}

base::TimeDelta ContentClient::GetIgnoreDuplicateNavsThreshold() const {
  return features::kDuplicateNavThreshold.Get();
}

bool ContentClient::ShouldIgnoreDuplicateNavs(
    const GURL& url,
    bool is_renderer_initiated) const {
  if (!base::FeatureList::IsEnabled(features::kIgnoreDuplicateNavs)) {
    return false;
  }

  const std::string& origins_list_str =
      features::kIgnoreDuplicateNavsOrigins.Get();

  bool is_match = false;
  // Check if the origin matches the origins list if it is not empty.
  if (!origins_list_str.empty()) {
    is_match = IsUrlInIgnoreDuplicateNavsOrigins(url);
    base::UmaHistogramBoolean(
        is_renderer_initiated
            ? "Navigation.RendererInitiated.DuplicateNavOriginMatch"
            : "Navigation.BrowserInitiated.DuplicateNavOriginMatch",
        is_match);
  }

  // Browser-initiated navigations are ignored if the skip flag is off.
  if (!is_renderer_initiated) {
    return !features::kSkipIgnoreBrowserInitiatedNavs.Get();
  }
  // Renderer-initiated navigations are ignored if the origin matches and the
  // skip flag is off.
  return (origins_list_str.empty() || is_match) &&
         !features::kSkipIgnoreRendererInitiatedNavs.Get();
}

bool ContentClient::IsUrlInIgnoreDuplicateNavsOrigins(const GURL& url) const {
  const std::string& origins_list_str =
      features::kIgnoreDuplicateNavsOrigins.Get();
  if (origins_list_str.empty()) {
    return false;
  }
  static const base::NoDestructor<std::vector<url::Origin>>
      target_origin_ignorelist([&origins_list_str] {
        std::vector<url::Origin> origins;
        const auto& origin_strings =
            base::SplitString(origins_list_str, ",", base::TRIM_WHITESPACE,
                              base::SPLIT_WANT_NONEMPTY);
        origins.reserve(origin_strings.size());
        for (const auto& origin_str : origin_strings) {
          origins.push_back(url::Origin::Create(GURL(origin_str)));
        }
        return origins;
      }());

  return std::ranges::contains(*target_origin_ignorelist,
                               url::Origin::Create(url));
}

bool ContentClient::IsFilePickerAllowedForCrossOriginSubframe(
    const url::Origin& origin) {
  return false;
}

}  // namespace content