// Copyright (C) 2025 Ada Logcis Ltd.

//

// This Source Code Form is subject to the terms of the Mozilla Public

// License, v. 2.0. If a copy of the MPL was not distributed with this

// file, You can obtain one at http://mozilla.org/MPL/2.0/.

////////////////////////////////////////////////////////////////////////////////

#include "config.h"

#include <fuzzer/FuzzedDataProvider.h>

#include <eval/eval_context.h>

#include <eval/evaluate.h>

#include <eval/dependency.h>

#include <dhcp/pkt6.h>

#include <dhcp/dhcp6.h>

#include <cstdlib>

#include <string>

using namespace isc;

using namespace isc::eval;

using namespace isc::dhcp;

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size) {

    FuzzedDataProvider fdp(Data, Size);

    EvalContext ctx(Option::V6);

    auto idx =  fdp.ConsumeIntegralInRange<uint8_t>(1, 18);

    const std::string payload = fdp.ConsumeRemainingBytesAsString();

    // Fuzz boolean parsing

    try {

        Pkt6 pkt(idx, 0);

        if (ctx.parseString(payload, EvalContext::PARSER_BOOL)) {

            ValueStack vs;

            Expression& exp_bool = ctx.expression_;

            ExpressionPtr exp_bool_ptr(new Expression(exp_bool));

            evaluateRaw(exp_bool, pkt, vs);

            evaluateBool(exp_bool, pkt);

            evaluateString(exp_bool, pkt);

            dependOnClass(exp_bool_ptr, payload);

        }

    } catch(const isc::Exception&) {}

    try {

        // Fuzz string parsing

        Pkt6 pkt(idx, 0);

        if (ctx.parseString(payload, EvalContext::PARSER_STRING)) {

            ValueStack vs;

            Expression& exp_str = ctx.expression_;

            ExpressionPtr exp_str_ptr(new Expression(exp_str));

            evaluateRaw(exp_str, pkt, vs);

            evaluateBool(exp_str, pkt);

            evaluateString(exp_str, pkt);

            dependOnClass(exp_str_ptr, payload);

        }

    } catch(const isc::Exception&) {}

    location loc;

    try {

        // Fuzz converter

        ctx.convertOptionCode(payload, loc);

    } catch(const isc::Exception&) {}

    try {

        ctx.convertOptionName(payload, loc);

    } catch(const isc::Exception&) {}

    try {

        ctx.convertNestLevelNumber(payload, loc);

    } catch(const isc::Exception&) {

        // Slient exceptions

    }

    return 0;

}