/**
 * Copyright (c) 2025, Timothy Stack
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * * Neither the name of Timothy Stack nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef lnav_guard_util_hh
#define lnav_guard_util_hh

namespace lnav {

struct guard_helper {
    guard_helper() = default;
    guard_helper(const guard_helper&) = delete;
    guard_helper(guard_helper&& other) noexcept { other.gh_enabled = false; }
    guard_helper& operator=(guard_helper&& other) noexcept
    {
        other.gh_enabled = false;

        return *this;
    }

    operator bool() const { return this->gh_enabled; }

    bool gh_enabled{true};
};

struct recursion_preventer : guard_helper {
    explicit recursion_preventer(size_t* depth) : rp_depth(depth)
    {
        *rp_depth += 1;
    }

    recursion_preventer(const recursion_preventer&) = delete;
    recursion_preventer& operator=(const recursion_preventer&) = delete;
    recursion_preventer& operator=(recursion_preventer&&) = default;
    recursion_preventer(recursion_preventer&&) = default;

    ~recursion_preventer()
    {
        if (this->gh_enabled) {
            *rp_depth -= 1;
        }
    }

    size_t* rp_depth{nullptr};
};

}  // namespace lnav

#endif
