#ifndef _STD_VECTOR
#define _STD_VECTOR

#include <algorithm>
#include <cstddef>
#include <iterator>
#include <memory>
#include <stdexcept>

#include <compressed_pair.hpp>
#include <msl_unk.hpp>

#define TAG_UNK 0

// from key decomp

namespace std {
    template <bool> class __vector_common {
    public:
        static void throw_length_error();
    };

    template <typename T, class Allocator> class __vec_deleter_helper;

    template <typename T, class Allocator> class __vec_deleter {
    public:
        typedef typename Metrowerks::compressed_pair<size_t, Allocator>::second_param allocator_param;
        typedef T value_type;
        typedef Allocator allocator_type;
        typedef size_t size_type;
        typedef value_type &reference;
        typedef const value_type &const_reference;
        typedef T *iterator;
        typedef const T *const_iterator;
        typedef T *pointer;
        typedef const pointer const_pointer;

        __vec_deleter() :
            data_(nullptr),
            size_(0),
            capacity_(0) {}

        explicit __vec_deleter(allocator_param a) :
            data_(nullptr),
            size_(0),
            capacity_(0, a) {}

        ~__vec_deleter();

        reference operator[](size_t n) {
            return data_[n];
        }

        const_reference operator[](size_t n) const {
            return data_[n];
        }

        pointer data() {
            return data_;
        }

        iterator begin() {
            return data_;
        }

        iterator end() {
            return data_ + size_;
        }

        reference front() {
            return data_[0];
        }

        const_reference front() const {
            return data_[0];
        }

        reference back() {
            return data_[size_ - 1];
        }

        const_reference back() const {
            return data_[size_ - 1];
        }

        void throw_length_error();

#if DONT_INLINE_STD
        void clear() {
            bool _b[4];
            size_t size = size_;
            _b[0]       = false;
            erase_at_end(size, _b[0]);
        }
        void erase_at_end(size_t, bool &);
#else
        void erase_at_end(const size_t n) {
            // erase_at_end(n, Metrowerks::int2type<true>());
            size_ -= n;
        }
        void clear() {
            erase_at_end(size());
        }
#endif

        // void erase_at_end(size_t n, Metrowerks::int2type<true>) DONT_INLINE_CLASS {
        //     T* e = end();
        //     size_ -= n;

        //     while (n != 0) {
        //         e--;
        //         e->~T();
        //         n--;
        //     }
        // }

        size_t &cap() {
            return capacity_.first();
        }

        Allocator alloc() const {
            return capacity_.second();
        }

        iterator erase(iterator __first, iterator __last, UnkMSLStruct1);

        void sub_push_back(const_reference x, Metrowerks::int2type<false>);
        void sub_push_back(const_reference x, Metrowerks::int2type<true>);

        void sub_push_back(const_reference x) {
            sub_push_back(x, Metrowerks::int2type<Metrowerks::has_trivial_copy_ctor<T>::value &&
                                                  Metrowerks::has_trivial_assignment<T>::value>());
        }

        void push_back(const_reference x, Metrowerks::int2type<false>) {
            if (size_ < cap()) {
                alloc().construct(end(), x);
                size_++;
            } else {
                sub_push_back(x);
            }
        }

        void push_back(const_reference x, Metrowerks::int2type<true>) {
            if (size_ < cap()) {
                size_++;
                back() = x;
            } else {
                sub_push_back(x);
            }
        }

        void push_back(const_reference x) {
            push_back(x, Metrowerks::int2type<Metrowerks::has_trivial_copy_ctor<T>::value &&
                                              Metrowerks::has_trivial_assignment<T>::value>());
        }

        void allocate(size_t min, size_t max) {
            allocate(min, max, Metrowerks::int2type<true>());
        }

        void allocate(size_t min, size_t max, Metrowerks::int2type<true> t) {
            allocate(max, t);
        }

        void allocate(size_t n) {
            allocate(n, Metrowerks::int2type<true>());
        }

        void allocate(size_t n, Metrowerks::int2type<true> t);

        void optimize_after_moved_from() {
            optimize_after_moved_from(Metrowerks::int2type<true>());
        }

        void optimize_after_moved_from(Metrowerks::int2type<true>) {
            size_ = 0;
        }

        bool expand_by(size_t n) {
            size_t max_cap = 0;
            return expand_by(n, max_cap, Metrowerks::int2type<true>());
        }

        bool expand_by(size_t n, size_t &max_cap, Metrowerks::int2type<true>) {
            max_cap = grow_by(n);
            return false;
        }

        size_t grow_by(size_t n);

        void append_realloc(size_t n, const_reference x);

        size_t max_size() const {
            return alloc().max_size();
        }

        size_t capacity() const {
            return capacity_.first();
        }

        volatile size_t size() {
            return size_;
        }

        void resize(size_t n) {
            size_ = n;
        }

        void move_construct_to_end(iterator begin, iterator end);

        void reallocate_copy(size_t n) {
            __vec_deleter<T, Allocator> tmp(alloc());
            tmp.allocate(n);
            tmp.move_construct_to_end(begin(), end());
            optimize_after_moved_from();
            swap(cap(), tmp.cap());
            swap(data_, tmp.data_);
            swap(size_, tmp.size_);
        }

        void reserve(size_t n) {
            if (n > cap()) {
                reallocate_copy(n);
            }
        }

        bool empty() const {
            return size_ == 0;
        }

    public:
        T *data_;
        size_t size_;
        Metrowerks::compressed_pair<size_t, Allocator> capacity_;
    };

    template <typename T, typename Allocator> __vec_deleter<T, Allocator>::~__vec_deleter() {
        UnkMSLStruct1 unk = UnkMSLStruct1(); // somehow needed

        if (data_ != nullptr) {
            clear();
            alloc().deallocate(data_, cap());
        }
    }

    template <typename T, typename Allocator> size_t __vec_deleter<T, Allocator>::grow_by(size_t n) {
        size_t max = max_size();
        size_t c   = cap();

        if (n > max - c) {
            __vector_common<true>::throw_length_error();
        }

        size_t a = max / 3;

        if (c < a) {
            return c + std::max((c + 1) * 3 / 5, n);
        } else if (c < a * 2) {
            return c + std::max((c + 1) / 2, n);
        }

        return max;
    }

    template <typename T, typename Allocator>
    void __vec_deleter<T, Allocator>::allocate(size_t n, Metrowerks::int2type<true> t) {
        size_t max = max_size();

        if (max < n) {
            __vector_common<true>::throw_length_error();
        }

        data_ = alloc().allocate(n);
        cap() = n;
    }

    // https://decomp.me/scratch/Yw4fn
    template <typename T, typename Allocator> void __vec_deleter<T, Allocator>::append_realloc(size_t n, const_reference x) {
        __vec_deleter_helper<T, Allocator> tmp(alloc());

        size_t max = tmp.grow_by((size_ + n) - cap());
        tmp.allocate(size_ + n, max);
        tmp.start_ = size_;
        tmp.construct_at_end(n, x);
        tmp.move_construct_to_begin(begin(), end());
        optimize_after_moved_from();

        std::swap(cap(), tmp.cap());
        std::swap(data_, tmp.data_);
        std::swap(size_, tmp.size_);
    }

    template <typename T, typename Allocator>
    void __vec_deleter<T, Allocator>::sub_push_back(const_reference x, Metrowerks::int2type<TAG_UNK>) {
        if (expand_by(1)) {
            size_++;
            back() = x;
        } else {
            append_realloc(1, x);
        }
    }

    template <typename T, typename Allocator>
    void __vec_deleter<T, Allocator>::sub_push_back(const_reference x, Metrowerks::int2type<true>) {
        if (expand_by(1)) {
            size_++;
            back() = x;
        } else {
            append_realloc(1, x);
        }
    }

    template <typename T, typename Allocator>
    __vec_deleter<T, Allocator>::iterator __vec_deleter<T, Allocator>::erase(iterator __first, iterator __last,
                                                                             UnkMSLStruct1) {
        // adapted from https://github.com/matta/sgi-stl/blob/635eaeef4533214ec140fb17411558ad441d2996/stl/stl_vector.h#L420

        if (__first != __last) {
            std::memmove(__first, __last, (end() - __last) * sizeof(value_type));
            this->size_ -= __last - __first;
        }

        return __first;
    }

    template <typename T, class Allocator> class __vec_deleter_helper : public __vec_deleter<T, Allocator> {
    protected:
        typedef __vec_deleter<T, Allocator> _Base;
        typedef _Base::allocator_param allocator_param;
        typedef _Base::value_type value_type;
        typedef _Base::allocator_type allocator_type;
        typedef _Base::size_type size_type;
        typedef _Base::reference reference;
        typedef _Base::const_reference const_reference;
        typedef _Base::pointer pointer;
        typedef _Base::const_pointer const_pointer;
        typedef _Base::iterator iterator;
        typedef _Base::const_iterator const_iterator;

    public:
        __vec_deleter_helper(allocator_param a) :
            _Base(a),
            start_(0) {}

        ~__vec_deleter_helper();

        void construct_at_end(size_t n, const_reference x) {
            construct_at_end(n, x, Metrowerks::int2type<Metrowerks::has_trivial_copy_ctor<T>::value>());
        }

        void construct_at_end(size_t n, const_reference x, Metrowerks::int2type<TAG_UNK>) {
            for (pointer p = _Base::data_ + _Base::size_; n; n--, p++, _Base::size_++) {
                _Base::alloc().construct(p, x);
            }
        }

        void construct_at_end(size_t n, const_reference x, Metrowerks::int2type<true>) {
            std::fill_n(_Base::data_ + start_ + _Base::size_, n, x);
            _Base::size_ += n;
        }

        void move_construct_to_begin(pointer first, pointer last) {
            move_construct_to_begin(first, last, Metrowerks::int2type<Metrowerks::has_trivial_copy_ctor<T>::value ? 2 : 0>());
        }

        void move_construct_to_begin(pointer first, pointer last, Metrowerks::int2type<TAG_UNK>) {
            for (pointer ptr = _Base::data_ + start_; first < last; start_--, _Base::size_++) {
                _Base::alloc().construct(--ptr, std::move(*--last));
            }
        }

        void move_construct_to_begin(pointer first, pointer last, Metrowerks::int2type<2>) {
            size_t n = last - first;
            start_ -= n;
            memcpy(_Base::data_ + start_, first, n * sizeof(value_type));
            memset(first, 0, n * sizeof(value_type));
            _Base::size_ += n;
        }

        size_t start_;
    };

    template <typename T, class Allocator> __vec_deleter_helper<T, Allocator>::~__vec_deleter_helper() {
        T *start = _Base::data_ + start_;
        T *end   = start + _Base::size_;

        while (start < end) {
            _Base::alloc().destroy(end);
            end--;
        }

        _Base::size_ = 0;
    }

    template <typename T, class Allocator, bool I> class __vec_constructor : public __vec_deleter<T, Allocator> {
    protected:
        typedef __vec_deleter<T, Allocator> _Base;
        typedef _Base::allocator_param allocator_param;
        typedef _Base::value_type value_type;
        typedef _Base::allocator_type allocator_type;
        typedef _Base::size_type size_type;
        typedef _Base::reference reference;
        typedef _Base::const_reference const_reference;
        typedef _Base::pointer pointer;
        typedef _Base::const_pointer const_pointer;
        typedef _Base::iterator iterator;
        typedef _Base::const_iterator const_iterator;

    public:
        __vec_constructor() {}
        // ~__vec_constructor();
    };

    template <typename T, class Allocator>
    class __vec_constructor<T, Allocator, true> : public __vec_constructor<T, Allocator, false> {
    protected:
        typedef __vec_deleter<T, Allocator> _Deleter;
        typedef __vec_constructor<T, Allocator, false> _Constructor;
        typedef _Constructor::allocator_param allocator_param;
        typedef _Constructor::value_type value_type;
        typedef _Constructor::allocator_type allocator_type;
        typedef _Constructor::size_type size_type;
        typedef _Constructor::reference reference;
        typedef _Constructor::const_reference const_reference;
        typedef _Constructor::pointer pointer;
        typedef _Constructor::const_pointer const_pointer;
        typedef _Constructor::iterator iterator;
        typedef _Constructor::const_iterator const_iterator;

        __vec_constructor() {}
        // ~__vec_constructor() { }

    public:
        void push_back(const_reference x) {
            _Constructor::push_back(x);
        }

        reference operator[](size_t n) {
            return _Deleter::operator[](n);
        }

        const_reference operator[](size_t n) const {
            return _Deleter::operator[](n);
        }
    };

    // clang-format off
    template <typename T, typename Allocator = allocator<T> > class vector : public __vec_constructor<T, Allocator, true> {
        // clang-format on
    protected:
        typedef __vec_constructor<T, Allocator, true> _Constructor;
        typedef __vec_deleter<T, Allocator> _Deleter;
        typedef _Constructor::allocator_param allocator_param;
        typedef _Constructor::value_type value_type;
        typedef _Constructor::allocator_type allocator_type;
        typedef _Constructor::size_type size_type;
        typedef _Constructor::reference reference;
        typedef _Constructor::const_reference const_reference;
        typedef _Constructor::pointer pointer;
        typedef _Constructor::const_pointer const_pointer;

    public:
        typedef _Constructor::iterator iterator;
        typedef _Constructor::const_iterator const_iterator;

        vector() {}
        ~vector() { }

        void push_back(const_reference x) {
            _Constructor::push_back(x);
        }

        void clear() {
            _Deleter::clear();
        }

        reference operator[](size_t n) {
            return _Deleter::operator[](n);
        }

        const_reference operator[](size_t n) const {
            return _Deleter::operator[](n);
        }

        iterator erase(iterator __first, iterator __last) {
            return _Deleter::erase(__first, __last, UnkMSLStruct1());
        }
    };

} // namespace std

template <typename T> class CustomVector : public std::vector<T> {
public:
protected:
    typedef std::vector<T> _Vector;
    typedef _Vector::allocator_param allocator_param;
    typedef _Vector::value_type value_type;
    typedef _Vector::allocator_type allocator_type;
    typedef _Vector::size_type size_type;
    typedef _Vector::reference reference;
    typedef _Vector::const_reference const_reference;
    typedef _Vector::pointer pointer;
    typedef _Vector::const_pointer const_pointer;

public:
    typedef _Vector::iterator iterator;
    typedef _Vector::const_iterator const_iterator;

    ~CustomVector();

    iterator unk_action2(iterator begin, iterator end, UnkMSLStruct1) {
        iterator it = begin;

        while (it != end) {
            T *ptr = (T *) *it;

            if (ptr != NULL) {
                if (*((u8 *) ptr + 4)) {
                    ::operator delete(ptr);
                }

                *it = NULL;
            }

            it++;
            begin = this->begin();
            end   = this->end();
        }

        return std::remove(begin, end, (T) NULL);
    }

    void unk_action1() {
        this->erase(this->unk_action2(this->begin(), this->end(), UnkMSLStruct1()), this->end());
        this->clear();
    }
};

template <typename T> CustomVector<T>::~CustomVector() {
    UnkMSLStruct1 unk = UnkMSLStruct1(); // somehow needed

    if (_Vector::begin() != nullptr) {
        _Vector::clear();
        _Vector::alloc().deallocate(_Vector::begin(), _Vector::cap());
    }
}

#endif