/**
 *    Copyright (C) 2023-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/exec/document_value/document_value_test_util.h"
#include "mongo/db/pipeline/expression_context_for_test.h"
#include "mongo/db/pipeline/expression_function.h"
#include "mongo/dbtests/dbtests.h"
namespace mongo {

namespace {

/**
 * A default redaction strategy that generates easy to check results for testing purposes.
 */
std::string applyHmacForTest(StringData s) {
    return str::stream() << "HASH<" << s << ">";
}


TEST(ExpressionFunction, SerializeAndRedactArgs) {

    SerializationOptions options;
    std::string replacementChar = "?";
    options.literalPolicy = LiteralSerializationPolicy::kToDebugTypeString;
    options.replacementForLiteralArgs = replacementChar;
    options.applyHmacToIdentifiers = true;
    options.identifierHmacPolicy = applyHmacForTest;

    auto expCtx = ExpressionContextForTest();
    auto expr = BSON("$function" << BSON("body"
                                         << "function(age) {return age >= 21;}"
                                         << "args" << BSON_ARRAY("$age") << "lang"
                                         << "js"));
    VariablesParseState vps = expCtx.variablesParseState;
    auto exprFunc = ExpressionFunction::parse(&expCtx, expr.firstElement(), vps);
    ASSERT_DOCUMENT_EQ_AUTO(  // NOLINT
        R"({"$function":{"body":"?string","args":["$HASH<age>"],"lang":"js"}})",
        exprFunc->serialize(options).getDocument());
}
}  // namespace
}  // namespace mongo