/**
 *    Copyright (C) 2018-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    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
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    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 Server Side 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/db/matcher/schema/expression_internal_schema_match_array_index.h"

namespace mongo {
constexpr StringData InternalSchemaMatchArrayIndexMatchExpression::kName;

InternalSchemaMatchArrayIndexMatchExpression::InternalSchemaMatchArrayIndexMatchExpression(
    StringData path, long long index, std::unique_ptr<ExpressionWithPlaceholder> expression)
    : ArrayMatchingMatchExpression(MatchExpression::INTERNAL_SCHEMA_MATCH_ARRAY_INDEX, path),
      _index(index),
      _expression(std::move(expression)) {
    invariant(static_cast<bool>(_expression));
}

void InternalSchemaMatchArrayIndexMatchExpression::debugString(StringBuilder& debug,
                                                               int level) const {
    _debugAddSpace(debug, level);

    BSONObjBuilder builder;
    serialize(&builder);
    debug << builder.obj().toString() << "\n";

    const auto* tag = getTag();
    if (tag) {
        debug << " ";
        tag->debugString(&debug);
    }
    debug << "\n";
}

bool InternalSchemaMatchArrayIndexMatchExpression::equivalent(const MatchExpression* expr) const {
    if (matchType() != expr->matchType()) {
        return false;
    }

    const auto* other = static_cast<const InternalSchemaMatchArrayIndexMatchExpression*>(expr);
    return path() == other->path() && _index == other->_index &&
        _expression->equivalent(other->_expression.get());
}

void InternalSchemaMatchArrayIndexMatchExpression::serialize(BSONObjBuilder* builder) const {
    BSONObjBuilder pathSubobj(builder->subobjStart(path()));
    {
        BSONObjBuilder matchArrayElemSubobj(pathSubobj.subobjStart(kName));
        matchArrayElemSubobj.append("index", _index);
        matchArrayElemSubobj.append("namePlaceholder", _expression->getPlaceholder().value_or(""));
        {
            BSONObjBuilder subexprSubObj(matchArrayElemSubobj.subobjStart("expression"));
            _expression->getFilter()->serialize(&subexprSubObj);
            subexprSubObj.doneFast();
        }
        matchArrayElemSubobj.doneFast();
    }
    pathSubobj.doneFast();
}

std::unique_ptr<MatchExpression> InternalSchemaMatchArrayIndexMatchExpression::shallowClone()
    const {
    auto clone = stdx::make_unique<InternalSchemaMatchArrayIndexMatchExpression>(
        path(), _index, _expression->shallowClone());
    if (getTag()) {
        clone->setTag(getTag()->clone());
    }
    return std::move(clone);
}

MatchExpression::ExpressionOptimizerFunc
InternalSchemaMatchArrayIndexMatchExpression::getOptimizer() const {
    return [](std::unique_ptr<MatchExpression> expression) {
        static_cast<InternalSchemaMatchArrayIndexMatchExpression&>(*expression)
            ._expression->optimizeFilter();
        return expression;
    };
}
}  // namespace mongo