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#pragma once
#include "compressed_pair.h"
#include <memory>
#include <cstddef>
#include <iostream>
#include <string>

 // Primary template
template <typename T, typename Deleter = std::default_delete<T>>
class UniquePtr {
public:

    // Constructors

    explicit UniquePtr(T* ptr = nullptr) {
        uptr_ = CompressedPair<T*, Deleter>(ptr, Deleter());
    }

    template<typename Del>
    UniquePtr(T *ptr, Del&& deleter) : uptr_(CompressedPair<T*, Deleter>(ptr, std::forward<decltype(deleter)>(deleter))){
    }

    UniquePtr(const UniquePtr& other) = delete;

    UniquePtr(UniquePtr&& other) noexcept {
        if (uptr_.GetFirst() != other.uptr_.GetFirst()) {
            std::swap(uptr_, other.uptr_);
            other.uptr_.GetFirst() = nullptr;
        }
    }
    template <typename Tp>
    UniquePtr(UniquePtr<Tp>&& other) noexcept : uptr_(other.uptr_.GetFirst(), std::forward<Deleter>(other.uptr_.GetSecond())) {
         other.uptr_.GetFirst() = nullptr;
    }


    // `operator=`-s

    UniquePtr& operator=(const UniquePtr& other) = delete;

    UniquePtr& operator=(UniquePtr&& other) noexcept {
        if (uptr_.GetFirst() != other.uptr_.GetFirst()) {
            std::swap(uptr_.GetFirst(), other.uptr_.GetFirst());
            uptr_.GetSecond() = std::forward<Deleter>(other.uptr_.GetSecond());
            other.uptr_.GetSecond()(other.uptr_.GetFirst());
            other.uptr_.GetFirst() = nullptr;
        }
        return *this;
    }

    UniquePtr& operator=(std::nullptr_t) {
        uptr_.GetSecond()(uptr_.GetFirst());
        uptr_ = CompressedPair<T*, Deleter>(nullptr, Deleter());
        return *this;
    }


    // Destructor

    ~UniquePtr() {
        uptr_.GetSecond()(uptr_.GetFirst());
    }


     //Modifiers

    T* Release() noexcept {
        T* tmp = uptr_.GetFirst();
        uptr_.GetFirst() = nullptr;
        return tmp;
    }

    void Reset(T* ptr = nullptr) noexcept {
        T* old_ptr = uptr_.GetFirst();
        uptr_.GetFirst() = ptr;
        if (old_ptr) {
            uptr_.GetSecond()(old_ptr);
        }
    }

    void Swap(UniquePtr& other) noexcept {
        std::swap(uptr_, other.uptr_);
    }


     //Observers

    T* Get() const noexcept {
        return uptr_.GetFirst();
    }

    Deleter& GetDeleter() {
        return uptr_.GetSecond();
    }

    const Deleter& GetDeleter() const {
        return uptr_.GetSecond();
    }

    explicit operator bool() const {
        return uptr_.GetFirst() != nullptr;
    }


    // Single-object dereference operators

    typename std::add_lvalue_reference<T>::type
    operator*() const {
        return *Get();
    }

    T* operator->() const {
        return uptr_.GetFirst();
    }

private:
    CompressedPair<T*, Deleter> uptr_;
    template<class U, class D>
    friend class UniquePtr;
};

// Specialization for arrays
template <typename T, typename Deleter>
class UniquePtr<T[], Deleter> {
public:
     //Constructors

    explicit UniquePtr(T* ptr = nullptr) {
         uptr_ = CompressedPair<T*, Deleter>(ptr, Deleter());
    }

    UniquePtr(T *ptr, Deleter deleter) {
        uptr_ = CompressedPair<T*, Deleter>(ptr, deleter);
    }

    UniquePtr(const UniquePtr& other) = delete;

    UniquePtr(UniquePtr&& other) noexcept {
        if (uptr_.GetFirst() != other.uptr_.GetFirst()) {
            uptr_ = other.uptr_;
            other.uptr_.GetFirst() = nullptr;
        }
    }
    template <typename Tp>
    UniquePtr(UniquePtr<Tp>&& other) noexcept : uptr_(other.uptr_.GetFirst(), other.uptr_.GetSecond()) {
        other.uptr_.GetFirst() = nullptr;
    }


   //  `operator=`-s

    UniquePtr& operator=(const UniquePtr& other) = delete;

    UniquePtr& operator=(UniquePtr&& other) noexcept {
        if (uptr_.GetFirst() != other.uptr_.GetFirst()) {
            std::swap(uptr_, other.uptr_);
            other.uptr_.GetFirst() = nullptr;
        }
        return *this;
    }

    UniquePtr& operator=(std::nullptr_t) {
        uptr_.GetSecond()(uptr_.GetFirst());
        uptr_ = CompressedPair<T*, Deleter>(nullptr, Deleter());
        return *this;
    }


   //  Destructor

    ~UniquePtr() {
        uptr_.GetSecond()(uptr_.GetFirst());
    }


    // Modifiers

    T* Release() noexcept {
        T* tmp = uptr_.GetFirst();
        uptr_.GetFirst() = nullptr;
        return tmp;
    }

    void Reset(T* ptr = nullptr) noexcept {
        T* old_ptr = uptr_.GetFirst();
        uptr_.GetFirst() = ptr;
        if (old_ptr) {
            uptr_.GetSecond()(old_ptr);
        }
    }

    void Swap(UniquePtr& other) noexcept {
        std::swap(uptr_, other.uptr_);
    }

    T& operator[](size_t i) {
        return Get()[i];
    }


     //Observers

    T* Get() const noexcept {
        return uptr_.GetFirst();
    }

    Deleter& GetDeleter() {
        return uptr_.GetSecond();
    }

    const Deleter& GetDeleter() const {
        return uptr_.GetSecond();
    }

    explicit operator bool() const {
        return uptr_.GetFirst() != nullptr;
    }

    const T& operator[](size_t i) const {
        return Get()[i];
    }

private:
    CompressedPair<T*, Deleter> uptr_;
    template<class U, class D>
    friend class UniquePtr;
};