// Copyright (c) 2012 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 "components/navigation_interception/intercept_navigation_delegate.h"

#include "base/android/jni_android.h"
#include "base/android/jni_string.h"
#include "base/callback.h"
#include "components/navigation_interception/intercept_navigation_throttle.h"
#include "components/navigation_interception/navigation_params_android.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/navigation_throttle.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/resource_request_info.h"
#include "content/public/browser/web_contents.h"
#include "jni/InterceptNavigationDelegate_jni.h"
#include "net/url_request/url_request.h"
#include "url/gurl.h"

using base::android::ConvertUTF8ToJavaString;
using base::android::ScopedJavaLocalRef;
using content::BrowserThread;
using ui::PageTransition;
using content::RenderViewHost;
using content::WebContents;

namespace navigation_interception {

namespace {

const int kMaxValidityOfUserGestureCarryoverInSeconds = 10;

const void* const kInterceptNavigationDelegateUserDataKey =
    &kInterceptNavigationDelegateUserDataKey;

bool CheckIfShouldIgnoreNavigationOnUIThread(WebContents* source,
                                             const NavigationParams& params) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  DCHECK(source);

  InterceptNavigationDelegate* intercept_navigation_delegate =
      InterceptNavigationDelegate::Get(source);
  if (!intercept_navigation_delegate)
    return false;

  return intercept_navigation_delegate->ShouldIgnoreNavigation(params);
}

void UpdateUserGestureCarryoverInfoOnUIThread(int render_process_id,
                                              int render_frame_id) {
  content::RenderFrameHost* render_frame_host =
      content::RenderFrameHost::FromID(render_process_id, render_frame_id);
  if (!render_frame_host)
    return;

  content::WebContents* web_contents =
      content::WebContents::FromRenderFrameHost(render_frame_host);

  InterceptNavigationDelegate* intercept_navigation_delegate =
      InterceptNavigationDelegate::Get(web_contents);

  if (intercept_navigation_delegate) {
    intercept_navigation_delegate->UpdateLastUserGestureCarryoverTimestamp();
  }
}

}  // namespace

// static
void InterceptNavigationDelegate::Associate(
    WebContents* web_contents,
    scoped_ptr<InterceptNavigationDelegate> delegate) {
  web_contents->SetUserData(kInterceptNavigationDelegateUserDataKey,
                            delegate.release());
}

// static
InterceptNavigationDelegate* InterceptNavigationDelegate::Get(
    WebContents* web_contents) {
  return static_cast<InterceptNavigationDelegate*>(
      web_contents->GetUserData(kInterceptNavigationDelegateUserDataKey));
}

// static
scoped_ptr<content::NavigationThrottle>
InterceptNavigationDelegate::CreateThrottleFor(
    content::NavigationHandle* handle) {
  return scoped_ptr<content::NavigationThrottle>(
      new InterceptNavigationThrottle(
          handle, base::Bind(&CheckIfShouldIgnoreNavigationOnUIThread), false));
}

// static
void InterceptNavigationDelegate::UpdateUserGestureCarryoverInfo(
    net::URLRequest* request) {
  const content::ResourceRequestInfo* info =
      content::ResourceRequestInfo::ForRequest(request);
  if (!info || !info->HasUserGesture())
    return;

  int render_process_id, render_frame_id;
  if (!info->GetAssociatedRenderFrame(&render_process_id, &render_frame_id))
    return;

  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                          base::Bind(&UpdateUserGestureCarryoverInfoOnUIThread,
                                     render_process_id, render_frame_id));
}

InterceptNavigationDelegate::InterceptNavigationDelegate(
    JNIEnv* env, jobject jdelegate)
    : weak_jdelegate_(env, jdelegate) {
}

InterceptNavigationDelegate::~InterceptNavigationDelegate() {
}

bool InterceptNavigationDelegate::ShouldIgnoreNavigation(
    const NavigationParams& navigation_params) {
  if (!navigation_params.url().is_valid())
    return false;

  JNIEnv* env = base::android::AttachCurrentThread();
  ScopedJavaLocalRef<jobject> jdelegate = weak_jdelegate_.get(env);

  if (jdelegate.is_null())
    return false;

  bool has_user_gesture_carryover =
      !navigation_params.has_user_gesture() &&
      base::TimeTicks::Now() - last_user_gesture_carryover_timestamp_ <=
          base::TimeDelta::FromSeconds(
              kMaxValidityOfUserGestureCarryoverInSeconds);

  ScopedJavaLocalRef<jobject> jobject_params = CreateJavaNavigationParams(
      env, navigation_params, has_user_gesture_carryover);

  return Java_InterceptNavigationDelegate_shouldIgnoreNavigation(
      env,
      jdelegate.obj(),
      jobject_params.obj());
}

void InterceptNavigationDelegate::UpdateLastUserGestureCarryoverTimestamp() {
  last_user_gesture_carryover_timestamp_ = base::TimeTicks::Now();
}

// Register native methods.

bool RegisterInterceptNavigationDelegate(JNIEnv* env) {
  return RegisterNativesImpl(env);
}

}  // namespace navigation_interception