// 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 <vector>
#include <string>


namespace zilliz {
namespace milvus {
namespace scheduler {

class Path {
 public:
    Path() = default;

    Path(std::vector<std::string>& path, uint64_t index) : path_(path), index_(index) {}

    void
    push_back(const std::string &str) {
        path_.push_back(str);
    }

    std::vector<std::string>
    Dump() {
        return path_;
    }

    std::string
    Next() {
        if (index_ > 0 && !path_.empty()) {
            --index_;
            return path_[index_];
        } else {
            return nullptr;
        }

    }

    std::string
    Last() {
        if (!path_.empty()) {
            return path_[0];
        } else {
            return nullptr;
        }
    }

 public:
    std::string &
    operator[](uint64_t index) {
        return path_[index];
    }

    std::vector<std::string>::iterator begin() { return path_.begin(); }
    std::vector<std::string>::iterator end() { return path_.end(); }

 public:
    std::vector<std::string> path_;
    uint64_t index_ = 0;
};

}
}
}