/**
 * Copyright (C) 2017 MongoDB Inc.
 *
 * This program is free software: you can redistribute it and/or  modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, the copyright holders give permission to link the
 * code of portions of this program with the OpenSSL library under certain
 * conditions as described in each individual source file and distribute
 * linked combinations including the program with the OpenSSL library. You
 * must comply with the GNU Affero General Public License in all respects
 * for all of the code used other than as permitted herein. If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so. If you do not
 * wish to do so, delete this exception statement from your version. If you
 * delete this exception statement from all source files in the program,
 * then also delete it in the license file.
 */

#include "mongo/platform/basic.h"

#include "mongo/s/query/document_source_router_adapter.h"

#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/expression_context.h"

namespace mongo {

boost::intrusive_ptr<DocumentSourceRouterAdapter> DocumentSourceRouterAdapter::create(
    const boost::intrusive_ptr<ExpressionContext>& expCtx,
    std::unique_ptr<RouterExecStage> childStage) {
    return new DocumentSourceRouterAdapter(expCtx, std::move(childStage));
}

DocumentSource::GetNextResult DocumentSourceRouterAdapter::getNext() {
    auto next = uassertStatusOK(_child->next(_execContext));
    if (auto nextObj = next.getResult()) {
        return Document::fromBsonWithMetaData(*nextObj);
    }
    return GetNextResult::makeEOF();
}

void DocumentSourceRouterAdapter::doDispose() {
    _child->kill(pExpCtx->opCtx);
}

void DocumentSourceRouterAdapter::reattachToOperationContext(OperationContext* opCtx) {
    _child->reattachToOperationContext(opCtx);
}

void DocumentSourceRouterAdapter::detachFromOperationContext() {
    _child->detachFromOperationContext();
}

Value DocumentSourceRouterAdapter::serialize(
    boost::optional<ExplainOptions::Verbosity> explain) const {
    invariant(explain);  // We shouldn't need to serialize this stage to send it anywhere.
    return Value();      // Return the empty value to hide this stage from explain output.
}

std::size_t DocumentSourceRouterAdapter::getNumRemotes() const {
    return _child->getNumRemotes();
}

bool DocumentSourceRouterAdapter::remotesExhausted() {
    return _child->remotesExhausted();
}

DocumentSourceRouterAdapter::DocumentSourceRouterAdapter(
    const boost::intrusive_ptr<ExpressionContext>& expCtx,
    std::unique_ptr<RouterExecStage> childStage)
    : DocumentSource(expCtx), _child(std::move(childStage)) {}

}  // namespace mongo