// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 <yaml-cpp/yaml.h>
#include <string>

#include "ConfigMgr.h"
#include "utils/Status.h"

namespace milvus {
namespace server {

class YamlConfigMgr : public ConfigMgr {
 public:
    static ConfigMgr*
    GetInstance() {
        static YamlConfigMgr mgr;
        return &mgr;
    }

    virtual Status
    LoadConfigFile(const std::string& filename);

    virtual void
    Print() const;

    virtual std::string
    DumpString() const;

    virtual const ConfigNode&
    GetRootNode() const;

    virtual ConfigNode&
    GetRootNode();

 private:
    bool
    SetConfigValue(const YAML::Node& node, const std::string& key, ConfigNode& config);

    bool
    SetChildConfig(const YAML::Node& node, const std::string& child_name, ConfigNode& config);

    bool
    SetSequence(const YAML::Node& node, const std::string& child_name, ConfigNode& config);

    void
    LoadConfigNode(const YAML::Node& node, ConfigNode& config);

 private:
    YAML::Node node_;
    ConfigNode config_;
};

}  // namespace server
}  // namespace milvus
