/*
 * Copyright (c) 2021, Andreas Kling <andreas@ladybird.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/Optional.h>
#include <AK/Types.h>
#include <LibJS/Forward.h>

namespace JS {

struct EnvironmentCoordinate {
    u32 hops { invalid_marker };
    u32 index { invalid_marker };

    bool is_valid() const { return hops != invalid_marker && index != invalid_marker; }

    static constexpr u32 invalid_marker = 0xfffffffe;
};

}

namespace AK {

template<>
struct SentinelOptionalTraits<JS::EnvironmentCoordinate> {
    static constexpr JS::EnvironmentCoordinate sentinel_value() { return {}; }
    static constexpr bool is_sentinel(JS::EnvironmentCoordinate const& value) { return !value.is_valid(); }
};

template<>
class Optional<JS::EnvironmentCoordinate> : public SentinelOptional<JS::EnvironmentCoordinate> {
public:
    using SentinelOptional::SentinelOptional;
};

}