/*
 * Copyright (c) 2024, NVIDIA CORPORATION.  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 "tensorrt_llm/runtime/iTensor.h"
#include "tensorrt_llm/runtime/speculativeDecodingModule.h"

#include <vector>

namespace tensorrt_llm::runtime
{

class MedusaModule : public SpeculativeDecodingModule
{
public:
    using TensorPtr = ITensor::SharedPtr;
    using MedusaChoices = std::vector<std::vector<SizeType32>>;

    explicit MedusaModule(SizeType32 maxAcceptedTokens, SizeType32 maxDraftTokens) noexcept
        : SpeculativeDecodingModule(maxAcceptedTokens, maxDraftTokens, maxDraftTokens)
    {
    }

    explicit MedusaModule() noexcept
        : MedusaModule(0, 0)
    {
    }

    [[nodiscard]] MedusaChoices const& getMedusaChoices() const noexcept
    {
        return mDefaultMedusaChoices;
    }

private:
    // We use mc_sim_7b_63 from official Medusa implementation, i.e. one of the best trees with 63 nodes found for 7B
    // Vicuna model.
    // We use it as default, if no other are trees are specified on the server level.
    MedusaChoices mDefaultMedusaChoices = {{0}, {0, 0}, {1}, {0, 1}, {2}, {0, 0, 0}, {1, 0}, {0, 2}, {3}, {0, 3}, {4},
        {0, 4}, {2, 0}, {0, 5}, {0, 0, 1}, {5}, {0, 6}, {6}, {0, 7}, {0, 1, 0}, {1, 1}, {7}, {0, 8}, {0, 0, 2}, {3, 0},
        {0, 9}, {8}, {9}, {1, 0, 0}, {0, 2, 0}, {1, 2}, {0, 0, 3}, {4, 0}, {2, 1}, {0, 0, 4}, {0, 0, 5}, {0, 0, 0, 0},
        {0, 1, 1}, {0, 0, 6}, {0, 3, 0}, {5, 0}, {1, 3}, {0, 0, 7}, {0, 0, 8}, {0, 0, 9}, {6, 0}, {0, 4, 0}, {1, 4},
        {7, 0}, {0, 1, 2}, {2, 0, 0}, {3, 1}, {2, 2}, {8, 0}, {0, 5, 0}, {1, 5}, {1, 0, 1}, {0, 2, 1}, {9, 0},
        {0, 6, 0}, {0, 0, 0, 1}, {1, 6}, {0, 7, 0}};
};
} // namespace tensorrt_llm::runtime