/**
 * MIT License
 *
 * Copyright (c) 2025 Huawei Technologies Co., Ltd. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * */
#ifndef UNIFIEDCACHE_POSIX_STORE_CC_SPACE_MANAGER_H
#define UNIFIEDCACHE_POSIX_STORE_CC_SPACE_MANAGER_H

#include "global_config.h"
#include "space_layout.h"
#include "thread/latch.h"
#include "thread/thread_pool.h"

namespace UC::PosixStore {

class SpaceManager {
    struct PrefixLookupContext {
        const Detail::BlockId* blocks;
        size_t begin;
        size_t end;
        size_t nWorker;
        std::shared_ptr<std::atomic<ssize_t>> firstFail;
        std::shared_ptr<std::atomic<int32_t>> status;
        std::shared_ptr<Latch> waiter;
    };

private:
    SpaceLayout layout_;
    ThreadPool<PrefixLookupContext> prefixLookupSrv_;

public:
    Status Setup(const Config& config);
    Expected<std::vector<uint8_t>> Lookup(const Detail::BlockId* blocks, size_t num);
    Expected<ssize_t> LookupOnPrefix(const Detail::BlockId* blocks, size_t num);
    const SpaceLayout* GetLayout() const { return &layout_; }

private:
    uint8_t Lookup(const Detail::BlockId* block);
    void OnLookupPrefix(PrefixLookupContext& ctx);
    void OnLookupPrefixTimeout(PrefixLookupContext& ctx);
};

}  // namespace UC::PosixStore

#endif
