#include "path-search.hpp"
#include "path-search-result.hpp"
#include "compat/assert.hpp"
#include <Corrade/Containers/ArrayView.h>
#include <utility>

namespace floormat {

std::unique_ptr<path_search_result::node> path_search_result::_pool; // NOLINT

path_search_result::path_search_result()
{
    if (_pool)
    {
        auto ptr = std::move(_pool);
        fm_debug_assert(ptr->vec.empty());
        auto next = std::move(ptr->_next);
        _node = std::move(ptr);
        _pool = std::move(next);
    }
    else
    {
        _node = std::make_unique<node>();
        _node->vec.reserve(min_length);
    }
}

path_search_result::~path_search_result() noexcept
{
    if (_node) [[likely]]
    {
        _node->vec.clear();
        _node->_next = std::move(_pool);
        _pool = std::move(_node);
    }
}

path_search_result::path_search_result(const path_search_result& x) noexcept
{
    fm_debug_assert(x._node);
    auto self = path_search_result{};
    self._node->vec = x._node->vec;
    _node = std::move(self._node);
}

path_search_result& path_search_result::operator=(const path_search_result& x) noexcept
{
    fm_debug_assert(_node);
    fm_debug_assert(!_node->_next);
    if (&x != this)
        _node->vec = x._node->vec;
    return *this;
}

path_search_result::node::node() noexcept = default;
size_t path_search_result::size() const { return _node->vec.size(); }
auto path_search_result::data() const -> const pair* { return _node->vec.data(); }
path_search_result::operator bool() const { return !_node->vec.empty(); }

path_search_result::operator ArrayView<const path_search_result::pair>() const
{
    fm_debug_assert(_node);
    return {_node->vec.data(), _node->vec.size()};
}

auto path_search_result::operator[](size_t index) const -> const pair&
{
    fm_debug_assert(_node);
    fm_debug_assert(index < _node->vec.size());
    return data()[index];
}

} // namespace floormat