// Copyright 2018 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/accessibility/captioning_controller.h"

#include "base/android/jni_string.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "third_party/blink/public/common/web_preferences/web_preferences.h"

// Must come after all headers that specialize FromJniType() / ToJniType().
#include "content/public/android/content_jni_headers/CaptioningController_jni.h"

using base::android::AttachCurrentThread;
using base::android::ConvertJavaStringToUTF8;
using base::android::JavaRef;
using base::android::ScopedJavaLocalRef;

namespace content {

namespace {

// Adds !important to all captions styles. They should always override any
// styles added by the video author or by a user stylesheet. This is because in
// Chrome, there is an option to turn off captions styles, so any time the
// captions are on, the styles should take priority.
std::string AddCSSImportant(std::string css_string) {
  return css_string + " !important";
}

}  // namespace

CaptioningController::CaptioningController(WebContents* web_contents)
    : WebContentsObserver(web_contents) {}

CaptioningController::~CaptioningController() = default;

void CaptioningController::Destroy(JNIEnv* env) {
  delete this;
}

void CaptioningController::PrimaryPageChanged(Page& page) {
  CaptioningController::RenderViewReady();
}

void CaptioningController::RenderViewReady() {
  JNIEnv* env = AttachCurrentThread();
  ScopedJavaLocalRef<jobject> obj = GetFromWebContents(env, web_contents());
  if (!obj.is_null()) {
    Java_CaptioningController_onRenderProcessChange(env, obj);
  }
}

void CaptioningController::SetTextTrackSettings(
    JNIEnv* env,
    bool textTracksEnabled,
    const JavaRef<jstring>& textTrackBackgroundColor,
    const JavaRef<jstring>& textTrackFontFamily,
    const JavaRef<jstring>& textTrackFontStyle,
    const JavaRef<jstring>& textTrackFontVariant,
    const JavaRef<jstring>& textTrackTextColor,
    const JavaRef<jstring>& textTrackTextShadow,
    const JavaRef<jstring>& textTrackTextSize) {
  auto web_prefs = web_contents()->GetOrCreateWebPreferences();
  web_prefs.text_tracks_enabled = textTracksEnabled;
  web_prefs.text_track_background_color =
      AddCSSImportant(ConvertJavaStringToUTF8(env, textTrackBackgroundColor));
  web_prefs.text_track_font_family =
      AddCSSImportant(ConvertJavaStringToUTF8(env, textTrackFontFamily));
  web_prefs.text_track_font_style =
      AddCSSImportant(ConvertJavaStringToUTF8(env, textTrackFontStyle));
  web_prefs.text_track_font_variant =
      AddCSSImportant(ConvertJavaStringToUTF8(env, textTrackFontVariant));
  web_prefs.text_track_text_color =
      AddCSSImportant(ConvertJavaStringToUTF8(env, textTrackTextColor));
  web_prefs.text_track_text_shadow =
      AddCSSImportant(ConvertJavaStringToUTF8(env, textTrackTextShadow));
  web_prefs.text_track_text_size =
      AddCSSImportant(ConvertJavaStringToUTF8(env, textTrackTextSize));
  web_contents()->SetWebPreferences(web_prefs);
}

ScopedJavaLocalRef<jobject> CaptioningController::GetFromWebContents(
    JNIEnv* env,
    WebContents* web_contents) {
  return Java_CaptioningController_getFromWebContents(env, web_contents);
}

static int64_t JNI_CaptioningController_Init(JNIEnv* env,
                                             WebContents* web_contents) {
  CHECK(web_contents);
  return reinterpret_cast<intptr_t>(new CaptioningController(web_contents));
}

}  // namespace content

DEFINE_JNI(CaptioningController)