//
//  ShapePermute.cpp
//  MNN
//
//  Created by MNN on 2019/01/10.
//  Copyright © 2018, Alibaba Group Holding Limited
//

#include "shape/SizeComputer.hpp"
#include "core/Macro.h"

namespace MNN {
class PermuteComputer : public SizeComputer {
public:
    virtual bool onComputeSize(const MNN::Op* op, const std::vector<Tensor*>& inputs,
                               const std::vector<Tensor*>& outputs) const override {
        MNN_ASSERT(1 == inputs.size());
        MNN_ASSERT(1 == outputs.size());

        auto input  = inputs[0];
        auto output = outputs[0];
        int dimSize = input->dimensions();
        output->buffer().dimensions = dimSize;

        if (nullptr != op->main_as_Permute()->dims()) {
            auto shape  = op->main_as_Permute()->dims();
            MNN_ASSERT(shape->size() == input->buffer().dimensions);
            for (int i = 0; i < dimSize; ++i) {
                output->buffer().dim[i].extent = input->buffer().dim[shape->data()[i]].extent;
            }
        } else {
            for (int i = 0; i < dimSize; ++i) {
                output->buffer().dim[i].extent = input->buffer().dim[dimSize-i-1].extent;
            }
        }
        TensorUtils::getDescribe(outputs[0])->dimensionFormat = TensorUtils::getDescribe(inputs[0])->dimensionFormat;
        output->buffer().type = input->buffer().type;

        return true;
    }
};

REGISTER_SHAPE(PermuteComputer, OpType_Permute);
} // namespace MNN