// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/ui/overscroll_pref_manager.h"

#include "base/feature_list.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/ui/browser_window/public/browser_window_interface.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/common/pref_names.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/content_features.h"

DEFINE_USER_DATA(OverscrollPrefManager);

// static
OverscrollPrefManager* OverscrollPrefManager::From(
    BrowserWindowInterface* browser_window) {
  return Get(browser_window->GetUnownedUserDataHost());
}

OverscrollPrefManager::OverscrollPrefManager(TabStripModel* tab_strip_model,
                                             bool is_type_devtools,
                                             ui::UnownedUserDataHost& host)
    : tab_strip_model_(tab_strip_model),
      scoped_unowned_user_data_(host, *this),
      is_type_devtools_(is_type_devtools) {
  PrefService* local_state = g_browser_process->local_state();
  if (local_state) {
    overscroll_history_navigation_enabled_ =
        local_state->GetBoolean(prefs::kOverscrollHistoryNavigationEnabled);
    local_state_pref_registrar_.Init(local_state);
    local_state_pref_registrar_.Add(
        prefs::kOverscrollHistoryNavigationEnabled,
        base::BindRepeating(
            &OverscrollPrefManager::OnOverscrollHistoryNavigationEnabledChanged,
            base::Unretained(this)));
  }
}

OverscrollPrefManager::~OverscrollPrefManager() = default;

void OverscrollPrefManager::OnOverscrollHistoryNavigationEnabledChanged() {
  overscroll_history_navigation_enabled_ =
      g_browser_process->local_state()->GetBoolean(
          prefs::kOverscrollHistoryNavigationEnabled);

  for (int tab_index = 0; tab_index < tab_strip_model_->count(); ++tab_index) {
    content::WebContents* web_contents =
        tab_strip_model_->GetWebContentsAt(tab_index);
    web_contents->SetOverscrollNavigationEnabled(
        overscroll_history_navigation_enabled_);
  }
}

bool OverscrollPrefManager::CanOverscrollContent() const {
  return !is_type_devtools_ && overscroll_history_navigation_enabled_ &&
         base::FeatureList::IsEnabled(features::kOverscrollHistoryNavigation);
}