// Copyright 2015 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 "chrome/browser/extensions/api/declarative_content/declarative_content_is_bookmarked_condition_tracker.h"

#include "base/bind.h"
#include "base/memory/ptr_util.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "base/values.h"
#include "chrome/browser/bookmarks/bookmark_model_factory.h"
#include "chrome/browser/extensions/api/declarative_content/content_constants.h"
#include "components/bookmarks/browser/bookmark_model.h"
#include "content/public/browser/web_contents.h"
#include "extensions/common/permissions/permissions_data.h"

namespace extensions {

namespace {

const char kInvalidTypeOfParameter[] = "Attribute '%s' has an invalid type";
const char kIsBookmarkedRequiresBookmarkPermission[] =
    "Property 'isBookmarked' requires 'bookmarks' permission";

bool HasBookmarkAPIPermission(const Extension* extension) {
  return extension->permissions_data()->HasAPIPermission(
      APIPermission::kBookmark);
}

}  // namespace

//
// DeclarativeContentIsBookmarkedPredicate
//

DeclarativeContentIsBookmarkedPredicate::
~DeclarativeContentIsBookmarkedPredicate() {
}

bool DeclarativeContentIsBookmarkedPredicate::IsIgnored() const {
  return !HasBookmarkAPIPermission(extension_.get());
}

// static
std::unique_ptr<DeclarativeContentIsBookmarkedPredicate>
DeclarativeContentIsBookmarkedPredicate::Create(
    ContentPredicateEvaluator* evaluator,
    const Extension* extension,
    const base::Value& value,
    std::string* error) {
  bool is_bookmarked = false;
  if (value.GetAsBoolean(&is_bookmarked)) {
    if (!HasBookmarkAPIPermission(extension)) {
      *error = kIsBookmarkedRequiresBookmarkPermission;
      return std::unique_ptr<DeclarativeContentIsBookmarkedPredicate>();
    } else {
      return base::WrapUnique(new DeclarativeContentIsBookmarkedPredicate(
          evaluator, extension, is_bookmarked));
    }
  } else {
    *error = base::StringPrintf(kInvalidTypeOfParameter,
                                declarative_content_constants::kIsBookmarked);
    return std::unique_ptr<DeclarativeContentIsBookmarkedPredicate>();
  }
}

ContentPredicateEvaluator*
DeclarativeContentIsBookmarkedPredicate::GetEvaluator() const {
  return evaluator_;
}

DeclarativeContentIsBookmarkedPredicate::
DeclarativeContentIsBookmarkedPredicate(
    ContentPredicateEvaluator* evaluator,
    scoped_refptr<const Extension> extension,
    bool is_bookmarked)
    : evaluator_(evaluator),
      extension_(extension),
      is_bookmarked_(is_bookmarked) {
}

//
// PerWebContentsTracker
//

DeclarativeContentIsBookmarkedConditionTracker::PerWebContentsTracker::
PerWebContentsTracker(
    content::WebContents* contents,
    const RequestEvaluationCallback& request_evaluation,
    const WebContentsDestroyedCallback& web_contents_destroyed)
    : WebContentsObserver(contents),
      request_evaluation_(request_evaluation),
      web_contents_destroyed_(web_contents_destroyed) {
  is_url_bookmarked_ = IsCurrentUrlBookmarked();
  request_evaluation_.Run(web_contents());
}

DeclarativeContentIsBookmarkedConditionTracker::PerWebContentsTracker::
~PerWebContentsTracker() {
}

void DeclarativeContentIsBookmarkedConditionTracker::PerWebContentsTracker::
BookmarkAddedForUrl(const GURL& url) {
  if (web_contents()->GetVisibleURL() == url) {
    is_url_bookmarked_ = true;
    request_evaluation_.Run(web_contents());
  }
}

void DeclarativeContentIsBookmarkedConditionTracker::PerWebContentsTracker::
BookmarkRemovedForUrls(const std::set<GURL>& urls) {
  if (base::ContainsKey(urls, web_contents()->GetVisibleURL())) {
    is_url_bookmarked_ = false;
    request_evaluation_.Run(web_contents());
  }
}

void DeclarativeContentIsBookmarkedConditionTracker::PerWebContentsTracker::
UpdateState(bool request_evaluation_if_unchanged) {
  bool state_changed =
      IsCurrentUrlBookmarked() != is_url_bookmarked_;
  if (state_changed)
    is_url_bookmarked_ = !is_url_bookmarked_;
  if (state_changed || request_evaluation_if_unchanged)
    request_evaluation_.Run(web_contents());
}

bool DeclarativeContentIsBookmarkedConditionTracker::PerWebContentsTracker::
IsCurrentUrlBookmarked() {
  bookmarks::BookmarkModel* bookmark_model =
      BookmarkModelFactory::GetForBrowserContext(
          web_contents()->GetBrowserContext());
  // BookmarkModel can be null during unit test execution.
  return bookmark_model &&
      bookmark_model->IsBookmarked(web_contents()->GetVisibleURL());
}

void DeclarativeContentIsBookmarkedConditionTracker::PerWebContentsTracker::
WebContentsDestroyed() {
  web_contents_destroyed_.Run(web_contents());
}

//
// DeclarativeContentIsBookmarkedConditionTracker
//

DeclarativeContentIsBookmarkedConditionTracker::
DeclarativeContentIsBookmarkedConditionTracker(content::BrowserContext* context,
                                               Delegate* delegate)
    : delegate_(delegate),
      extensive_bookmark_changes_in_progress_(0),
      scoped_bookmarks_observer_(this) {
  bookmarks::BookmarkModel* bookmark_model =
      BookmarkModelFactory::GetForBrowserContext(context);
  // Can be null during unit test execution.
  if (bookmark_model)
    scoped_bookmarks_observer_.Add(bookmark_model);
}

DeclarativeContentIsBookmarkedConditionTracker::
~DeclarativeContentIsBookmarkedConditionTracker() {
}

std::string DeclarativeContentIsBookmarkedConditionTracker::
GetPredicateApiAttributeName() const {
  return declarative_content_constants::kIsBookmarked;
}

std::unique_ptr<const ContentPredicate>
DeclarativeContentIsBookmarkedConditionTracker::CreatePredicate(
    const Extension* extension,
    const base::Value& value,
    std::string* error) {
  return DeclarativeContentIsBookmarkedPredicate::Create(this, extension, value,
                                                         error);
}

// We don't have any centralized state to update for new predicates, so we don't
// need to take any action here or in StopTrackingPredicates().
void DeclarativeContentIsBookmarkedConditionTracker::TrackPredicates(
    const std::map<const void*, std::vector<const ContentPredicate*>>&
        predicates) {
}

void DeclarativeContentIsBookmarkedConditionTracker::StopTrackingPredicates(
    const std::vector<const void*>& predicate_groups) {
}

void DeclarativeContentIsBookmarkedConditionTracker::TrackForWebContents(
    content::WebContents* contents) {
  per_web_contents_tracker_[contents] =
      make_linked_ptr(new PerWebContentsTracker(
          contents,
          base::Bind(&Delegate::RequestEvaluation, base::Unretained(delegate_)),
          base::Bind(&DeclarativeContentIsBookmarkedConditionTracker::
                     DeletePerWebContentsTracker,
                     base::Unretained(this))));
}

void DeclarativeContentIsBookmarkedConditionTracker::OnWebContentsNavigation(
    content::WebContents* contents,
    const content::LoadCommittedDetails& details,
    const content::FrameNavigateParams& params) {
  DCHECK(base::ContainsKey(per_web_contents_tracker_, contents));
  per_web_contents_tracker_[contents]->UpdateState(true);
}

bool DeclarativeContentIsBookmarkedConditionTracker::EvaluatePredicate(
    const ContentPredicate* predicate,
    content::WebContents* tab) const {
  DCHECK_EQ(this, predicate->GetEvaluator());
  const DeclarativeContentIsBookmarkedPredicate* typed_predicate =
      static_cast<const DeclarativeContentIsBookmarkedPredicate*>(predicate);
  auto loc = per_web_contents_tracker_.find(tab);
  DCHECK(loc != per_web_contents_tracker_.end());
  return loc->second->is_url_bookmarked() == typed_predicate->is_bookmarked();
}

void DeclarativeContentIsBookmarkedConditionTracker::BookmarkModelChanged() {}

void DeclarativeContentIsBookmarkedConditionTracker::BookmarkNodeAdded(
    bookmarks::BookmarkModel* model,
    const bookmarks::BookmarkNode* parent,
    int index) {
  if (!extensive_bookmark_changes_in_progress_) {
    for (const auto& web_contents_tracker_pair : per_web_contents_tracker_) {
      web_contents_tracker_pair.second->BookmarkAddedForUrl(
          parent->GetChild(index)->url());
    }
  }
}

void DeclarativeContentIsBookmarkedConditionTracker::BookmarkNodeRemoved(
    bookmarks::BookmarkModel* model,
    const bookmarks::BookmarkNode* parent,
    int old_index,
    const bookmarks::BookmarkNode* node,
    const std::set<GURL>& no_longer_bookmarked) {
  if (!extensive_bookmark_changes_in_progress_) {
    for (const auto& web_contents_tracker_pair : per_web_contents_tracker_) {
      web_contents_tracker_pair.second->BookmarkRemovedForUrls(
          no_longer_bookmarked);
    }
  }
}

void DeclarativeContentIsBookmarkedConditionTracker::
ExtensiveBookmarkChangesBeginning(
    bookmarks::BookmarkModel* model) {
  ++extensive_bookmark_changes_in_progress_;
}

void
DeclarativeContentIsBookmarkedConditionTracker::ExtensiveBookmarkChangesEnded(
    bookmarks::BookmarkModel* model) {
  if (--extensive_bookmark_changes_in_progress_ == 0)
    UpdateAllPerWebContentsTrackers();
}

void
DeclarativeContentIsBookmarkedConditionTracker::GroupedBookmarkChangesBeginning(
    bookmarks::BookmarkModel* model) {
  ++extensive_bookmark_changes_in_progress_;
}

void
DeclarativeContentIsBookmarkedConditionTracker::GroupedBookmarkChangesEnded(
    bookmarks::BookmarkModel* model) {
  if (--extensive_bookmark_changes_in_progress_ == 0)
    UpdateAllPerWebContentsTrackers();
}

void
DeclarativeContentIsBookmarkedConditionTracker::DeletePerWebContentsTracker(
    content::WebContents* contents) {
  DCHECK(base::ContainsKey(per_web_contents_tracker_, contents));
  per_web_contents_tracker_.erase(contents);
}

void DeclarativeContentIsBookmarkedConditionTracker::
UpdateAllPerWebContentsTrackers() {
  for (const auto& web_contents_tracker_pair : per_web_contents_tracker_)
    web_contents_tracker_pair.second->UpdateState(false);
}

}  // namespace extensions
