// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
//
// 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 <memory>
#include <cstdio>
#include <vector>
#include "paddle/fluid/train/custom_trainer/feed/common/registerer.h"
#include "paddle/fluid/train/custom_trainer/feed/trainer_context.h"
#include <yaml-cpp/yaml.h>

namespace paddle {
namespace custom_trainer {
namespace feed {
    
class FileSystem {
public:
    FileSystem() {}
    virtual ~FileSystem() {}
    virtual int initialize(const YAML::Node& config, std::shared_ptr<TrainerContext> context) = 0;
    virtual std::shared_ptr<FILE> open_read(const std::string& path, const std::string& converter) = 0;
    virtual std::shared_ptr<FILE> open_write(const std::string& path, const std::string& converter) = 0;
    virtual int64_t file_size(const std::string& path) = 0;
    virtual void remove(const std::string& path) = 0;
    virtual std::vector<std::string> list(const std::string& path) = 0;
    virtual std::string tail(const std::string& path) = 0;
    virtual bool exists(const std::string& path) = 0;
    virtual void mkdir(const std::string& path) = 0;
    virtual std::string path_join(const std::string& dir, const std::string& path);
    virtual std::pair<std::string, std::string> path_split(const std::string& path);
    virtual int err_no() const {
        return _err_no;
    }
    inline operator bool() {
        return err_no() == 0;
    }
    virtual void reset_err_no() {
        _err_no = 0;
    }
protected:
    int _err_no = 0;
};
REGISTER_REGISTERER(FileSystem);

}  // namespace feed
}  // namespace custom_trainer
}  // namespace paddle