/*
* MIT License
*
* Copyright (c) 2023 igozdev
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/

#include <type_traits>
#include <utility>

namespace pc
{
    namespace detail
    {
        template <class Tag, class T>
        struct storer
        {
            inline static T value;
        };

        template <class T>
        struct holder
        {
        };
    }

    template <class Tag, auto V>
    struct accessor
    {
        inline static const auto value = detail::storer<Tag, decltype(V)>::value = V;
    };

    enum class modifier
    {
        const_ = 1 << 0,
        volatile_ = 1 << 1,
        lvalue = 1 << 2,
        rvalue = 1 << 3,
    };
    constexpr modifier operator|(modifier lhs, modifier rhs)
    {
        return static_cast<modifier>(static_cast<std::underlying_type_t<modifier>>(lhs) | static_cast<std::underlying_type_t<modifier>>(rhs));
    }
    template <class T, modifier Mods>
    struct modified
    {
        using type = T;
        constexpr static modifier mods = Mods;
    };
    template <class T>
    concept Modified = std::is_same_v<T, modified<typename T::type, T::mods>>;

    template <class Tag, class T, class ClassT>
    auto public_cast(ClassT& t) requires std::is_function_v<T>
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                return
                    [&t](TArgs... args) {
                        return (t.*detail::storer<Tag, T ClassT::*>::value)(args...);
                    };
            }(detail::holder<T>{});
    }
    template <class Tag, class T, class ClassT>
    auto& public_cast(ClassT& t) requires (!std::is_function_v<T> && !Modified<T>)
    {
        return t.*(detail::storer<Tag, T ClassT::*>::value);
    }
    template <class Tag, class T, class ClassT>
    auto& public_cast()
    {
        return *detail::storer<Tag, T*>::value;
    }

    template <class Tag, class T, class ClassT>
    auto publicize() requires (!Modified<T>)
    {
        return detail::storer<Tag, T ClassT::*>::value;
    }
    template <class Tag, class T, class ClassT>
    auto publicize_static()
    {
        return detail::storer<Tag, T*>::value;
    }

    template <class Tag, Modified T, class ClassT>
    auto public_cast(const ClassT& t) requires (T::mods == modifier::const_)
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const;
                return
                    [&t](TArgs... args) {
                    return (t.*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(volatile ClassT& t) requires (T::mods == modifier::volatile_)
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) volatile;
                return
                    [&t](TArgs... args) {
                    return (t.*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(ClassT& t) requires (T::mods == modifier::lvalue)
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) &;
                return
                    [&t](TArgs... args) {
                    return (t.*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(ClassT&& t) requires (T::mods == modifier::rvalue)
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) &&;
                return
                    [&t](TArgs... args) {
                    return (std::move(t).*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(const volatile ClassT& t) requires (T::mods == (modifier::const_ | modifier::volatile_))
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const volatile;
                return
                    [&t](TArgs... args) {
                    return (t.*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(const ClassT& t) requires (T::mods == (modifier::const_ | modifier::lvalue))
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const &;
                return
                    [&t](TArgs... args) {
                    return (t.*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(const ClassT&& t) requires (T::mods == (modifier::const_ | modifier::rvalue))
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const &&;
                return
                    [&t](TArgs... args) {
                    return (std::move(t).*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(volatile ClassT& t) requires (T::mods == (modifier::volatile_ | modifier::lvalue))
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) volatile &;
                return
                    [&t](TArgs... args) {
                    return (t.*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(volatile ClassT&& t) requires (T::mods == (modifier::volatile_ | modifier::rvalue))
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) volatile &&;
                return
                    [&t](TArgs... args) {
                    return (std::move(t).*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(const volatile ClassT& t) requires (T::mods == (modifier::const_ | modifier::volatile_ | modifier::lvalue))
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const volatile &;
                return
                    [&t](TArgs... args) {
                    return (t.*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto public_cast(const volatile ClassT&& t) requires (T::mods == (modifier::const_ | modifier::volatile_ | modifier::rvalue))
    {
        return
            [&t]<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const volatile &&;
                return
                    [&t](TArgs... args) {
                    return (std::move(t).*detail::storer<Tag, ptr_type>::value)(args...);
            };
        }(detail::holder<typename T::type>{});
    }

    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == modifier::const_)
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == modifier::volatile_)
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) volatile;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == modifier::lvalue)
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) &;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == modifier::rvalue)
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) &&;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == (modifier::const_ | modifier::volatile_))
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const volatile;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == (modifier::const_ | modifier::lvalue))
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const &;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == (modifier::const_ | modifier::rvalue))
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const &&;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == (modifier::volatile_ | modifier::lvalue))
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) volatile &;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == (modifier::volatile_ | modifier::rvalue))
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) volatile &&;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == (modifier::const_ | modifier::volatile_ | modifier::lvalue))
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const volatile &;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
    template <class Tag, Modified T, class ClassT>
    auto publicize() requires (T::mods == (modifier::const_ | modifier::volatile_ | modifier::rvalue))
    {
        return
            []<class TR, class... TArgs>(detail::holder<TR(TArgs...)>) {
                using ptr_type = TR(ClassT::*)(TArgs...) const volatile &&;
                return detail::storer<Tag, ptr_type>::value;
            }(detail::holder<typename T::type>{});
    }
}