/*
 * Copyright 2024 iLogtail Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include "config/ConfigDiff.h"
#include "config/watcher/ConfigWatcher.h"

namespace logtail {

class InstanceConfigManager;

class InstanceConfigWatcher : public ConfigWatcher {
public:
    InstanceConfigWatcher(const InstanceConfigWatcher&) = delete;
    InstanceConfigWatcher& operator=(const InstanceConfigWatcher&) = delete;

    static InstanceConfigWatcher* GetInstance() {
        static InstanceConfigWatcher instance;
        return &instance;
    }

    InstanceConfigDiff CheckConfigDiff();

#ifdef APSARA_UNIT_TEST_MAIN
    void SetInstanceConfigManager(const InstanceConfigManager* m) { mInstanceConfigManager = m; }
#endif

private:
    InstanceConfigWatcher();
    ~InstanceConfigWatcher() = default;

    const InstanceConfigManager* mInstanceConfigManager = nullptr;
};

} // namespace logtail
