/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/


#ifndef QARRAY_TEST_SIMPLE_VECTOR_H
#define QARRAY_TEST_SIMPLE_VECTOR_H

#include <QtCore/qarraydata.h>
#include <QtCore/qarraydatapointer.h>

#include <algorithm>

template <class T>
struct SimpleVector
{
private:
    typedef QTypedArrayData<T> Data;

public:
    typedef T value_type;
    typedef typename Data::iterator iterator;
    typedef typename Data::const_iterator const_iterator;

    SimpleVector()
    {
    }

    explicit SimpleVector(size_t n)
        : d(Data::allocate(n))
    {
        if (n)
            d->appendInitialize(n);
    }

    SimpleVector(size_t n, const T &t)
        : d(Data::allocate(n))
    {
        if (n)
            d->copyAppend(n, t);
    }

    SimpleVector(const T *begin, const T *end)
        : d(Data::allocate(end - begin))
    {
        if (end - begin)
            d->copyAppend(begin, end);
    }

    SimpleVector(QArrayDataPointerRef<T> ptr)
        : d(ptr)
    {
    }

    explicit SimpleVector(Data *ptr)
        : d(ptr)
    {
    }

    bool empty() const { return d->size == 0; }
    bool isNull() const { return d.isNull(); }
    bool isEmpty() const { return this->empty(); }

    bool isStatic() const { return d->ref.isStatic(); }
    bool isShared() const { return d->ref.isShared(); }
    bool isSharedWith(const SimpleVector &other) const { return d == other.d; }
#if !defined(QT_NO_UNSHARABLE_CONTAINERS)
    bool isSharable() const { return d->ref.isSharable(); }
    void setSharable(bool sharable) { d.setSharable(sharable); }
#endif

    size_t size() const { return d->size; }
    size_t capacity() const { return d->alloc; }

    iterator begin() { detach(); return d->begin(); }
    iterator end() { detach(); return d->end(); }

    const_iterator begin() const { return d->constBegin(); }
    const_iterator end() const { return d->constEnd(); }

    const_iterator constBegin() const { return begin(); }
    const_iterator constEnd() const { return end(); }

    T &operator[](size_t i) { Q_ASSERT(i < size_t(d->size)); detach(); return begin()[i]; }
    T &at(size_t i) { Q_ASSERT(i < size_t(d->size)); detach(); return begin()[i]; }

    const T &operator[](size_t i) const { Q_ASSERT(i < size_t(d->size)); return begin()[i]; }
    const T &at(size_t i) const { Q_ASSERT(i < size_t(d->size)); return begin()[i]; }

    T &front()
    {
        Q_ASSERT(!isEmpty());
        detach();
        return *begin();
    }

    T &back()
    {
        Q_ASSERT(!isEmpty());
        detach();
        return *(end() - 1);
    }

    const T &front() const
    {
        Q_ASSERT(!isEmpty());
        return *begin();
    }

    const T &back() const
    {
        Q_ASSERT(!isEmpty());
        return *(end() - 1);
    }

    void reserve(size_t n)
    {
        if (n == 0)
            return;

        if (n <= capacity()) {
            if (d->capacityReserved)
                return;
            if (!d->ref.isShared()) {
                d->capacityReserved = 1;
                return;
            }
        }

        SimpleVector detached(Data::allocate(qMax(n, size()),
                    d->detachFlags() | Data::CapacityReserved));
        if (size())
            detached.d->copyAppend(constBegin(), constEnd());
        detached.swap(*this);
    }

    void resize(size_t newSize)
    {
        if (size() == newSize)
            return;

        if (d.needsDetach() || newSize > capacity()) {
            SimpleVector detached(Data::allocate(
                        d->detachCapacity(newSize), d->detachFlags()));
            if (newSize) {
                if (newSize < size()) {
                    const T *const begin = constBegin();
                    detached.d->copyAppend(begin, begin + newSize);
                } else {
                    if (size()) {
                        const T *const begin = constBegin();
                        detached.d->copyAppend(begin, begin + size());
                    }
                    detached.d->appendInitialize(newSize);
                }
            }
            detached.swap(*this);
            return;
        }

        if (newSize > size())
            d->appendInitialize(newSize);
        else
            d->truncate(newSize);
    }

    void prepend(const_iterator first, const_iterator last)
    {
        if (!d->size) {
            append(first, last);
            return;
        }

        if (first == last)
            return;

        T *const begin = d->begin();
        if (d.needsDetach()
                || capacity() - size() < size_t(last - first)) {
            SimpleVector detached(Data::allocate(
                        d->detachCapacity(size() + (last - first)),
                        d->detachFlags() | Data::Grow));

            detached.d->copyAppend(first, last);
            detached.d->copyAppend(begin, begin + d->size);
            detached.swap(*this);

            return;
        }

        d->insert(begin, first, last);
    }

    void append(const_iterator first, const_iterator last)
    {
        if (first == last)
            return;

        if (d.needsDetach()
                || capacity() - size() < size_t(last - first)) {
            SimpleVector detached(Data::allocate(
                        d->detachCapacity(size() + (last - first)),
                        d->detachFlags() | Data::Grow));

            if (d->size) {
                const T *const begin = constBegin();
                detached.d->copyAppend(begin, begin + d->size);
            }
            detached.d->copyAppend(first, last);
            detached.swap(*this);

            return;
        }

        d->copyAppend(first, last);
    }

    void insert(int position, const_iterator first, const_iterator last)
    {
        if (position < 0)
            position += d->size + 1;

        if (position <= 0) {
            prepend(first, last);
            return;
        }

        if (size_t(position) >= size()) {
            append(first, last);
            return;
        }

        if (first == last)
            return;

        const iterator begin = d->begin();
        const iterator where = begin + position;
        const iterator end = begin + d->size;
        if (d.needsDetach()
                || capacity() - size() < size_t(last - first)) {
            SimpleVector detached(Data::allocate(
                        d->detachCapacity(size() + (last - first)),
                        d->detachFlags() | Data::Grow));

            if (position)
                detached.d->copyAppend(begin, where);
            detached.d->copyAppend(first, last);
            detached.d->copyAppend(where, end);
            detached.swap(*this);

            return;
        }

        if ((first >= where && first < end)
                || (last > where && last <= end)) {
            // Copy overlapping data first and only then shuffle it into place
            iterator start = d->begin() + position;
            iterator middle = d->end();

            d->copyAppend(first, last);
            std::rotate(start, middle, d->end());

            return;
        }

        d->insert(where, first, last);
    }

    void erase(iterator first, iterator last)
    {
        if (first == last)
            return;

        const T *const begin = d->begin();
        const T *const end = begin + d->size;

        if (d.needsDetach()) {
            SimpleVector detached(Data::allocate(
                        d->detachCapacity(size() - (last - first)),
                        d->detachFlags()));
            if (first != begin)
                detached.d->copyAppend(begin, first);
            detached.d->copyAppend(last, end);
            detached.swap(*this);

            return;
        }

        if (last == end)
            d->truncate(end - first);
        else
            d->erase(first, last);
    }

    void swap(SimpleVector &other)
    {
        qSwap(d, other.d);
    }

    void clear()
    {
        d.clear();
    }

    void detach()
    {
        d.detach();
    }

    static SimpleVector fromRawData(const T *data, size_t size,
            QArrayData::AllocationOptions options = Data::Default)
    {
        return SimpleVector(Data::fromRawData(data, size, options));
    }

private:
    QArrayDataPointer<T> d;
};

template <class T>
bool operator==(const SimpleVector<T> &lhs, const SimpleVector<T> &rhs)
{
    if (lhs.isSharedWith(rhs))
        return true;
    if (lhs.size() != rhs.size())
        return false;
    return std::equal(lhs.begin(), lhs.end(), rhs.begin());
}

template <class T>
bool operator!=(const SimpleVector<T> &lhs, const SimpleVector<T> &rhs)
{
    return !(lhs == rhs);
}

template <class T>
bool operator<(const SimpleVector<T> &lhs, const SimpleVector<T> &rhs)
{
    return std::lexicographical_compare(lhs.begin(), lhs.end(), rhs.begin(), rhs.end());
}

template <class T>
bool operator>(const SimpleVector<T> &lhs, const SimpleVector<T> &rhs)
{
    return rhs < lhs;
}

template <class T>
bool operator<=(const SimpleVector<T> &lhs, const SimpleVector<T> &rhs)
{
    return !(rhs < lhs);
}

template <class T>
bool operator>=(const SimpleVector<T> &lhs, const SimpleVector<T> &rhs)
{
    return !(lhs < rhs);
}

namespace std {
    template <class T>
    void swap(SimpleVector<T> &v1, SimpleVector<T> &v2)
    {
        v1.swap(v2);
    }
}

#endif // include guard