/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <AK/StdLibExtras.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibGfx/Rect.h>
#include <LibIPC/Decoder.h>
#include <LibIPC/Encoder.h>

namespace Gfx {

template<typename T>
void Rect<T>::intersect(const Rect<T>& other)
{
    T l = max(left(), other.left());
    T r = min(right(), other.right());
    T t = max(top(), other.top());
    T b = min(bottom(), other.bottom());

    if (l > r || t > b) {
        m_location = {};
        m_size = {};
        return;
    }

    m_location.set_x(l);
    m_location.set_y(t);
    m_size.set_width((r - l) + 1);
    m_size.set_height((b - t) + 1);
}

template<typename T>
Rect<T> Rect<T>::united(const Rect<T>& other) const
{
    if (is_null())
        return other;
    if (other.is_null())
        return *this;
    Rect<T> rect;
    rect.set_left(min(left(), other.left()));
    rect.set_top(min(top(), other.top()));
    rect.set_right(max(right(), other.right()));
    rect.set_bottom(max(bottom(), other.bottom()));
    return rect;
}

template<typename T>
Vector<Rect<T>, 4> Rect<T>::shatter(const Rect<T>& hammer) const
{
    Vector<Rect<T>, 4> pieces;
    if (!intersects(hammer)) {
        pieces.unchecked_append(*this);
        return pieces;
    }
    Rect<T> top_shard {
        x(),
        y(),
        width(),
        hammer.y() - y()
    };
    Rect<T> bottom_shard {
        x(),
        hammer.y() + hammer.height(),
        width(),
        (y() + height()) - (hammer.y() + hammer.height())
    };
    Rect<T> left_shard {
        x(),
        max(hammer.y(), y()),
        hammer.x() - x(),
        min((hammer.y() + hammer.height()), (y() + height())) - max(hammer.y(), y())
    };
    Rect<T> right_shard {
        hammer.x() + hammer.width(),
        max(hammer.y(), y()),
        right() - hammer.right(),
        min((hammer.y() + hammer.height()), (y() + height())) - max(hammer.y(), y())
    };
    if (!top_shard.is_empty())
        pieces.unchecked_append(top_shard);
    if (!bottom_shard.is_empty())
        pieces.unchecked_append(bottom_shard);
    if (!left_shard.is_empty())
        pieces.unchecked_append(left_shard);
    if (!right_shard.is_empty())
        pieces.unchecked_append(right_shard);

    return pieces;
}

template<typename T>
void Rect<T>::align_within(const Rect<T>& other, TextAlignment alignment)
{
    switch (alignment) {
    case TextAlignment::Center:
        center_within(other);
        return;
    case TextAlignment::TopLeft:
        set_location(other.location());
        return;
    case TextAlignment::TopRight:
        set_x(other.x() + other.width() - width());
        set_y(other.y());
        return;
    case TextAlignment::CenterLeft:
        set_x(other.x());
        center_vertically_within(other);
        return;
    case TextAlignment::CenterRight:
        set_x(other.x() + other.width() - width());
        center_vertically_within(other);
        return;
    case TextAlignment::BottomLeft:
        set_x(other.x());
        set_y(other.y() + other.height() - height());
        return;
    case TextAlignment::BottomRight:
        set_x(other.x() + other.width() - width());
        set_y(other.y() + other.height() - height());
        return;
    }
}

template<typename T>
void Rect<T>::set_size_around(const Size<T>& new_size, const Point<T>& fixed_point)
{
    const T new_x = fixed_point.x() - (T)(new_size.width() * ((float)(fixed_point.x() - x()) / width()));
    const T new_y = fixed_point.y() - (T)(new_size.height() * ((float)(fixed_point.y() - y()) / height()));

    set_location({ new_x, new_y });
    set_size(new_size);
}

template<>
String IntRect::to_string() const
{
    return String::formatted("[{},{} {}x{}]", x(), y(), width(), height());
}

template<>
String FloatRect::to_string() const
{
    return String::formatted("[{},{} {}x{}]", x(), y(), width(), height());
}

}

namespace IPC {

bool encode(Encoder& encoder, const Gfx::IntRect& rect)
{
    encoder << rect.location() << rect.size();
    return true;
}

bool decode(Decoder& decoder, Gfx::IntRect& rect)
{
    Gfx::IntPoint point;
    Gfx::IntSize size;
    if (!decoder.decode(point))
        return false;
    if (!decoder.decode(size))
        return false;
    rect = { point, size };
    return true;
}

}

template class Gfx::Rect<int>;
template class Gfx::Rect<float>;