/*******************************************************************************
 * Copyright (c) 2015-2018 Skymind, Inc.
 * Copyright (c) 2019-2020 Konduit K.K.
 * 
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://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.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

//
//  @author raver119@gmail.com
//  @author AbdelRauf 

#ifndef DEV_TESTS_SHAPEDESCRIPTOR_H
#define DEV_TESTS_SHAPEDESCRIPTOR_H

#include <unordered_map>
#include <vector>
#include <system/dll.h>
#include <system/pointercast.h>
#include <array/ArrayOptions.h>
#include <array/DataType.h>
#include <initializer_list>

namespace sd {


#define SHAPE_DESC_OK 0
#define SHAPE_DESC_INCORRECT_STRIDES 1 //strides does not match shapes
#define SHAPE_DESC_INCORRECT_EWS 2 //ews neither matches stride nor continuity
#define SHAPE_DESC_INCORRECT_RANK 4 //rank > 32 or shape size and rank does not match

class ND4J_EXPORT ShapeDescriptor {

    private:
        int _rank = 0;
        std::vector<Nd4jLong> _shape;
        std::vector<Nd4jLong> _strides;
        Nd4jLong _ews = 1;
        char _order = 'c';
        DataType _dataType;
        Nd4jLong _extraProperties = 0;
        Nd4jLong _paddedAllocSize = 0;

    public:
        ShapeDescriptor(const ShapeDescriptor &other);
        ShapeDescriptor(const Nd4jLong *shapeInfo, bool inheritDtype = true);
        explicit ShapeDescriptor(const Nd4jLong *shapeInfo, const sd::DataType dtypeOverride);
        explicit ShapeDescriptor(const Nd4jLong *shapeInfo, const Nd4jLong *dtypeOverride);
        explicit ShapeDescriptor(const Nd4jLong *shapeInfo, const Nd4jLong *dtypeOverride, const Nd4jLong *orderOverride);
        explicit ShapeDescriptor(const DataType type, const Nd4jLong length);
        explicit ShapeDescriptor(const DataType type, const char order, const Nd4jLong *shape, const int rank);
        explicit ShapeDescriptor(const DataType type, const char order, const std::initializer_list<Nd4jLong> &shape);
        explicit ShapeDescriptor(const DataType type, const char order, const std::vector<Nd4jLong> &shape);
        explicit ShapeDescriptor(const DataType type, const char order, const std::vector<Nd4jLong> &shape, const std::vector<Nd4jLong> &strides);
        explicit ShapeDescriptor(const DataType type, const char order, const std::vector<Nd4jLong> &shape, const std::vector<Nd4jLong> &strides, const Nd4jLong ews);
        explicit ShapeDescriptor(const DataType type, const char order, const Nd4jLong *shape, const Nd4jLong *strides, const int rank, Nd4jLong ews, Nd4jLong extras);

        ShapeDescriptor() = default;
        ~ShapeDescriptor() = default;

        int rank() const;
        Nd4jLong ews() const;
        Nd4jLong arrLength() const;
        char order() const;
        DataType dataType() const;
        bool isEmpty() const;
        std::vector<Nd4jLong>& shape();
        std::vector<Nd4jLong>& strides();

        //returns minimal allocation length
        Nd4jLong allocLength() const;

        //returns Status for the correctness
        Nd4jLong validate() const;

        // we use default copy assignment operator
        ShapeDescriptor& operator=(const ShapeDescriptor& other) = default;

        // we use default move assignment operator
        ShapeDescriptor& operator=(ShapeDescriptor&& other) noexcept = default;

        // equal to operator
        bool operator==(const ShapeDescriptor &other) const;

        // less than operator
        bool operator<(const ShapeDescriptor &other) const;

        Nd4jLong* toShapeInfo() const;



        static ShapeDescriptor emptyDescriptor(const DataType type);
        static ShapeDescriptor scalarDescriptor(const DataType type);
        static ShapeDescriptor vectorDescriptor(const Nd4jLong length, const DataType type);

        //create Descriptor with padded buffer.
        static ShapeDescriptor paddedBufferDescriptor(const DataType type, const char order, const std::vector<Nd4jLong>& shape, const std::vector<Nd4jLong>& paddings);
    };
}

#ifndef __JAVACPP_HACK__

namespace std {
    template<>
    class ND4J_EXPORT hash<sd::ShapeDescriptor> {
    public:
        size_t operator()(const sd::ShapeDescriptor &k) const;
    };
}

#endif


#endif //DEV_TESTS_SHAPEDESCRIPTOR_H