//*****************************************************************************
// Copyright 2017-2020 Intel Corporation
//
// 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 "ngraph/log.hpp"
#include "ngraph/pass/graph_rewrite.hpp"
#include "ngraph/runtime/aligned_buffer.hpp"
#include "ngraph/util.hpp"

namespace ngraph
{
    namespace pass
    {
        class ConstantFolding;
        bool revalidate_and_ensure_static(std::shared_ptr<ngraph::Node> n);
    }
}

class NGRAPH_API ngraph::pass::ConstantFolding : public ngraph::pass::GraphRewrite
{
public:
    enum class CFTransformations
    {
        RESHAPE,
        BROADCAST,
        PAD,
        DEQUANTIZE,
        UNARY,
        BINARY,
        QUANTIZE,
        CONVERT,
        SHAPE_OF,
        REVERSE,
        ARITHMETIC_REDUCTION,
        LOGICAL_REDUCTION,
        CONCAT,
        GATHER,
        SCATTER,
        SLICE,
        DYN_RESHAPE,
        TRANSPOSE,
        RANGE,
        SELECT,
        SQUEEZE,
        UNSQUEEZE,
        SPLIT,
        VARIADIC_SPLIT,
        ONE_HOT,
        TILE,
        NON_ZERO
    };

    ConstantFolding(const ngraph::BuildNodeExecutorMap& cfmap = ngraph::BuildNodeExecutorMap())
        : GraphRewrite()
    {
        m_cfmap = cfmap;
        m_enable_shape_inference = true;
        construct_constant_split();
        construct_constant_variadic_split();
        construct_constant_pad();
        construct_constant_quantize();
        construct_constant_dequantize();
        construct_constant_convert();
        construct_constant_reverse();
        construct_constant_arithmetic_reduction();
        construct_constant_logical_reduction();
        construct_constant_gather_with_subgraph();
        construct_constant_scatter_elements_update();
        construct_constant_slice();
        construct_constant_dyn_reshape();
        construct_constant_transpose();
        construct_constant_select();
        construct_constant_one_hot();
        construct_constant_tile();
        construct_constant_default();
    }

private:
    void construct_constant_pad();
    void construct_constant_quantize();
    void construct_constant_dequantize();
    void construct_constant_convert();
    void construct_constant_reverse();
    void construct_constant_arithmetic_reduction();
    void construct_constant_logical_reduction();
    void construct_constant_gather_with_subgraph();
    void construct_constant_scatter_elements_update();
    void construct_constant_slice();
    void construct_constant_dyn_reshape();
    void construct_constant_transpose();
    void construct_constant_select();
    void construct_constant_split();
    void construct_constant_variadic_split();
    void construct_constant_one_hot();
    void construct_constant_tile();
    void construct_constant_default();

    ngraph::BuildNodeExecutorMap m_cfmap;
};
