// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/ntp_snippets/pref_util.h"

#include <memory>
#include <ostream>
#include <utility>

#include "base/values.h"
#include "components/prefs/pref_service.h"

namespace ntp_snippets {
namespace prefs {

std::set<std::string> ReadDismissedIDsFromPrefs(const PrefService& pref_service,
                                                const std::string& pref_name) {
  std::set<std::string> dismissed_ids;
  const base::Value::List& list = pref_service.GetList(pref_name);
  for (const base::Value& value : list) {
    DCHECK(value.is_string())
        << "Failed to parse dismissed id from prefs param " << pref_name
        << " into string.";
    dismissed_ids.insert(value.GetString());
  }
  return dismissed_ids;
}

void StoreDismissedIDsToPrefs(PrefService* pref_service,
                              const std::string& pref_name,
                              const std::set<std::string>& dismissed_ids) {
  base::Value::List list;
  for (const std::string& dismissed_id : dismissed_ids) {
    list.Append(dismissed_id);
  }
  pref_service->SetList(pref_name, std::move(list));
}

}  // namespace prefs
}  // namespace ntp_snippets