// Licensed to the LF AI & Data foundation 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 <string>
#include <optional>
#include <memory>

#include "common/Consts.h"
#include "boost/filesystem/path.hpp"
#include "log/Log.h"
#include "storage/ChunkManager.h"
#include "storage/Types.h"
#include "milvus-storage/filesystem/fs.h"
#include "filemanager/FileManager.h"

namespace milvus::storage {

struct FileManagerContext {
    FileManagerContext() : chunkManagerPtr(nullptr) {
    }
    explicit FileManagerContext(const ChunkManagerPtr& chunkManagerPtr)
        : chunkManagerPtr(chunkManagerPtr) {
    }
    FileManagerContext(const FieldDataMeta& fieldDataMeta,
                       const IndexMeta& indexMeta,
                       const ChunkManagerPtr& chunkManagerPtr,
                       milvus_storage::ArrowFileSystemPtr fs)
        : fieldDataMeta(fieldDataMeta),
          indexMeta(indexMeta),
          chunkManagerPtr(chunkManagerPtr),
          fs(std::move(fs)) {
    }

    bool
    Valid() const {
        return chunkManagerPtr != nullptr;
    }

    void
    set_for_loading_index(bool value) {
        for_loading_index = value;
    }

    void
    set_plugin_context(std::shared_ptr<CPluginContext> context) {
        plugin_context = context;
    }

    FieldDataMeta fieldDataMeta;
    IndexMeta indexMeta;
    ChunkManagerPtr chunkManagerPtr;
    milvus_storage::ArrowFileSystemPtr fs;
    bool for_loading_index{false};
    std::shared_ptr<CPluginContext> plugin_context;
};

#define FILEMANAGER_TRY try {
#define FILEMANAGER_CATCH                                                   \
    }                                                                       \
    catch (SegcoreError & e) {                                              \
        LOG_ERROR("SegcoreError:{} code {}", e.what(), e.get_error_code()); \
        return false;                                                       \
    }                                                                       \
    catch (std::exception & e) {                                            \
        LOG_ERROR("Exception:{}", e.what());                                \
        return false;
#define FILEMANAGER_END }

class FileManagerImpl : public milvus::FileManager {
 public:
    explicit FileManagerImpl(const FieldDataMeta& field_mata,
                             IndexMeta index_meta)
        : field_meta_(field_mata), index_meta_(std::move(index_meta)) {
    }

 public:
    /**
     * @brief Load a file to the local disk, so we can use stl lib to operate it.
     *
     * @param filename
     * @return false if any error, or return true.
     */
    virtual bool
    LoadFile(const std::string& filename) override = 0;

    /**
     * @brief Add file to FileManager to manipulate it.
     *
     * @param filename
     * @return false if any error, or return true.
     */
    virtual bool
    AddFile(const std::string& filename) override = 0;

    /**
     * @brief Check if a file exists.
     *
     * @param filename
     * @return std::nullopt if any error, or return if the file exists.
     */
    virtual std::optional<bool>
    IsExisted(const std::string& filename) override = 0;

    /**
     * @brief Delete a file from FileManager.
     *
     * @param filename
     * @return false if any error, or return true.
     */
    virtual bool
    RemoveFile(const std::string& filename) override = 0;

    virtual bool
    AddFileMeta(const FileMeta& file_meta) override = 0;

    virtual std::shared_ptr<InputStream>
    OpenInputStream(const std::string& filename) override = 0;

    virtual std::shared_ptr<OutputStream>
    OpenOutputStream(const std::string& filename) override = 0;

 public:
    virtual std::string
    GetName() const = 0;

    virtual FieldDataMeta
    GetFieldDataMeta() const {
        return field_meta_;
    }

    virtual IndexMeta
    GetIndexMeta() const {
        return index_meta_;
    }

    virtual ChunkManagerPtr
    GetChunkManager() const {
        return rcm_;
    }

    virtual std::string
    GetRemoteIndexObjectPrefix() const {
        boost::filesystem::path prefix = rcm_->GetRootPath();
        boost::filesystem::path path = std::string(INDEX_ROOT_PATH);
        boost::filesystem::path path1 =
            std::to_string(index_meta_.build_id) + "/" +
            std::to_string(index_meta_.index_version) + "/" +
            std::to_string(field_meta_.partition_id) + "/" +
            std::to_string(field_meta_.segment_id);
        return (prefix / path / path1).string();
    }

    virtual std::string
    GetRemoteIndexObjectPrefixV2() const {
        return std::string(INDEX_ROOT_PATH) + "/" +
               std::to_string(index_meta_.build_id) + "/" +
               std::to_string(index_meta_.index_version) + "/" +
               std::to_string(field_meta_.partition_id) + "/" +
               std::to_string(field_meta_.segment_id);
    }

    virtual std::string
    GetRemoteIndexFilePrefixV2() const {
        boost::filesystem::path bucket = rcm_->GetBucketName();
        std::string v1_prefix = GetRemoteIndexObjectPrefix();
        if (bucket.empty()) {
            return v1_prefix;
        } else {
            return (bucket / v1_prefix).string();
        }
    }

    virtual std::string
    GetRemoteTextLogPrefix() const {
        boost::filesystem::path prefix = rcm_->GetRootPath();
        boost::filesystem::path path = std::string(TEXT_LOG_ROOT_PATH);
        boost::filesystem::path path1 =
            std::to_string(index_meta_.build_id) + "/" +
            std::to_string(index_meta_.index_version) + "/" +
            std::to_string(field_meta_.collection_id) + "/" +
            std::to_string(field_meta_.partition_id) + "/" +
            std::to_string(field_meta_.segment_id) + "/" +
            std::to_string(field_meta_.field_id);
        return (prefix / path / path1).string();
    }

 protected:
    // collection meta
    FieldDataMeta field_meta_;

    // index meta
    IndexMeta index_meta_;
    ChunkManagerPtr rcm_;
    milvus_storage::ArrowFileSystemPtr fs_;
    std::shared_ptr<CPluginContext> plugin_context_;
};

using FileManagerImplPtr = std::shared_ptr<FileManagerImpl>;

}  // namespace milvus::storage