/********************************************************************************
 * Copyright (c) 2023 CEA-List
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 ********************************************************************************/

#include "aidge/operator/Pop.hpp"

#include <memory>
#include <string>

#include "aidge/data/Tensor.hpp"
#include "aidge/utils/ErrorHandling.hpp"
#include "aidge/utils/Registrar.hpp"
#include "aidge/utils/StaticAttributes.hpp"
#include "aidge/utils/Types.h"

Aidge::Elts_t Aidge::Pop_OpImpl::getNbRequiredData(const Aidge::IOIndex_t inputIdx) const {
    assert(mOp.getRawInput(inputIdx) && "requires valid input");

    const Pop_Op& op = dynamic_cast<const Pop_Op&>(mOp);
    return Elts_t::DataElts(op.getInput(inputIdx)->size()
        / op.getInput(inputIdx)->dims()[0]);
}

void Aidge::Pop_OpImpl::forward() {
    const Pop_Op& op = dynamic_cast<const Pop_Op&>(mOp);
    assert(op.getInput(0) && "missing input #0");
    const unsigned int forwardStep = op.template getAttr<PopAttr::ForwardStep>();
    *op.getOutput(0) = op.getInput(0)->extract({forwardStep});
}

const std::string Aidge::Pop_Op::Type = "Pop";

bool Aidge::Pop_Op::forwardDims(bool /*allowDataDependency*/) {
    // check inputs have been associated
    if (!getInput(0)) {
        AIDGE_THROW_OR_ABORT(std::runtime_error, "{}: input #0 should be associated with a Tensor", type());
    }
    if (!(getInput(0)->empty())) {
        auto inputDims = getInput(0)->dims();
        inputDims.erase(inputDims.begin());
        getOutput(0)->resize(inputDims);
        return true;
    }

    return false;
}

void Aidge::Pop_Op::updateConsummerProducer() {
    Operator::updateConsummerProducer();
    this->template getAttr<PopAttr::ForwardStep>() = 0;
}

void Aidge::Pop_Op::setBackend(const std::string& name, Aidge::DeviceIdx_t device) {
    if (Registrar<Pop_Op>::exists({name})){
        SET_IMPL_MACRO(Pop_Op, *this, name);
    }
    else {
        mImpl = std::make_shared<Pop_OpImpl>(*this);
    }
    mOutputs[0]->setBackend(name, device);
}

void Aidge::Pop_Op::forward() {
    Operator::forward();
    ++this->template getAttr<PopAttr::ForwardStep>();
}