#pragma once

#include <memory>
#include <mutex>

#include "megbrain/comp_node.h"
#include "megbrain/opr/group_manager.h"
#include "megray.h"

namespace mgb {
namespace opr {

MegRay::DType get_megray_dtype(megdnn::DType);

MegRay::Backend get_megray_backend(const std::string& backend);

std::shared_ptr<MegRay::Context> get_megray_context(CompNode comp_node);

/*!
 * gather MegRay unique ids and build communicator, use hash for deduplication
 */
class MegRayCommBuilder {
private:
    bool find(uint64_t hash, std::shared_ptr<MegRay::Communicator>& comm);
    void emplace(uint64_t hash, std::shared_ptr<MegRay::Communicator> comm);
    void remove(uint64_t hash, std::shared_ptr<MegRay::Communicator> comm);

    std::unordered_map<uint64_t, std::shared_ptr<MegRay::Communicator>> m_megray_comms;
    std::mutex m_map_mtx;

    static MegRayCommBuilder* sm_instance;
    static std::mutex sm_instance_mtx;

public:
    static std::shared_ptr<MegRay::Communicator> get_megray_comm(
            uint64_t hash, std::string key, uint32_t size, uint32_t rank,
            MegRay::Backend backend,
            std::shared_ptr<mgb::opr::GroupClient> group_client);
};

}  // namespace opr
}  // namespace mgb

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