// Copyright (C) 2018-2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
//

#include <vpu/frontend/frontend.hpp>

#include <vector>
#include <unordered_set>
#include <memory>
#include <set>
#include <string>

namespace vpu {

namespace {

class ReshapeStage final : public StageNode {
public:
    using StageNode::StageNode;

private:
    StagePtr cloneImpl() const override {
        return std::make_shared<ReshapeStage>(*this);
    }

    void propagateDataOrderImpl(StageDataInfo<DimsOrder>& orderInfo) override {
        auto input = inputEdge(0)->input();
        auto output = outputEdge(0)->output();

        // Only default order is supported
        orderInfo.setInput(inputEdge(0), DimsOrder::fromNumDims(input->desc().numDims()));
        orderInfo.setOutput(outputEdge(0), DimsOrder::fromNumDims(output->desc().numDims()));
    }

    void getDataStridesRequirementsImpl(StageDataInfo<StridesRequirement>& stridesInfo) override {
        stridesInfo.setInput(inputEdge(0), StridesRequirement::compact());
        stridesInfo.setOutput(outputEdge(0), StridesRequirement::compact());
    }

    void finalizeDataLayoutImpl() override {
    }

    void getBatchSupportInfoImpl(StageDataInfo<BatchSupport>& batchInfo) override {
    }

    void initialCheckImpl() const override {
        const auto& firstInputPrecision = input(0)->desc().type();
        assertInputsOutputsTypes(this, {{firstInputPrecision}}, {{firstInputPrecision}});
        IE_ASSERT(input(0)->desc().totalDimSize() == output(0)->desc().totalDimSize());
    }

    void serializeParamsImpl(BlobSerializer&) const override {
        VPU_THROW_EXCEPTION << "Must never be called";
    }

    void serializeDataImpl(BlobSerializer&) const override {
        VPU_THROW_EXCEPTION << "Must never be called";
    }
};

}  // namespace

void FrontEnd::parseReshape(const Model& model, const ie::CNNLayerPtr& layer, const DataVector& inputs, const DataVector& outputs) const {
    VPU_THROW_UNLESS(inputs.size() == 1 || (inputs.size() == 2 && inputs[1]->usage() == DataUsage::Const),
        "%v of type %v is not supported with dynamic shape", layer->name, layer->type);
    IE_ASSERT((inputs.size() == 1) || (inputs.size() == 2 && inputs[1]->usage() == DataUsage::Const));
    IE_ASSERT(outputs.size() == 1);
    _stageBuilder->addReshapeStage(model, layer->name, layer, inputs[0], outputs[0]);
}

Stage StageBuilder::addReshapeStage(
        const Model& model,
        const std::string& name,
        const ie::CNNLayerPtr& layer,
        const Data& input,
        const Data& output) {
    IE_ASSERT(input->desc().totalDimSize() == output->desc().totalDimSize());

    return model->addNewStage<ReshapeStage>(
        name,
        StageType::Reshape,
        layer,
        {input},
        {output});
}

}  // namespace vpu
