// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/gfx/rect.h"

#if defined(OS_WIN)
#include <windows.h>
#elif defined(OS_MACOSX)
#include <CoreGraphics/CGGeometry.h>
#elif defined(TOOLKIT_USES_GTK)
#include <gdk/gdk.h>
#endif
#if defined(USE_WAYLAND)
#include <cairo.h>
#endif

#include "base/logging.h"
#include "base/stringprintf.h"
#include "ui/gfx/insets.h"

namespace {

void AdjustAlongAxis(int dst_origin, int dst_size, int* origin, int* size) {
  *size = std::min(dst_size, *size);
  if (*origin < dst_origin)
    *origin = dst_origin;
  else
    *origin = std::min(dst_origin + dst_size, *origin + *size) - *size;
}

} // namespace

namespace gfx {

Rect::Rect() {
}

Rect::Rect(int width, int height)
    : size_(width, height) {
}

Rect::Rect(int x, int y, int width, int height)
    : origin_(x, y), size_(width, height) {
}

Rect::Rect(const gfx::Size& size)
    : size_(size) {
}

Rect::Rect(const gfx::Point& origin, const gfx::Size& size)
    : origin_(origin), size_(size) {
}

Rect::~Rect() {}

#if defined(OS_WIN)
Rect::Rect(const RECT& r)
    : origin_(r.left, r.top) {
  set_width(std::abs(r.right - r.left));
  set_height(std::abs(r.bottom - r.top));
}

Rect& Rect::operator=(const RECT& r) {
  origin_.SetPoint(r.left, r.top);
  set_width(std::abs(r.right - r.left));
  set_height(std::abs(r.bottom - r.top));
  return *this;
}
#elif defined(OS_MACOSX)
Rect::Rect(const CGRect& r)
    : origin_(r.origin.x, r.origin.y) {
  set_width(r.size.width);
  set_height(r.size.height);
}

Rect& Rect::operator=(const CGRect& r) {
  origin_.SetPoint(r.origin.x, r.origin.y);
  set_width(r.size.width);
  set_height(r.size.height);
  return *this;
}
#elif defined(TOOLKIT_USES_GTK)
Rect::Rect(const GdkRectangle& r)
    : origin_(r.x, r.y) {
  set_width(r.width);
  set_height(r.height);
}

Rect& Rect::operator=(const GdkRectangle& r) {
  origin_.SetPoint(r.x, r.y);
  set_width(r.width);
  set_height(r.height);
  return *this;
}
#endif
#if defined(USE_WAYLAND)
Rect::Rect(const cairo_rectangle_int_t& r)
    : origin_(r.x, r.y) {
  set_width(r.width);
  set_height(r.height);
}

Rect& Rect::operator=(const cairo_rectangle_int_t& r) {
  origin_.SetPoint(r.x, r.y);
  set_width(r.width);
  set_height(r.height);
  return *this;
}
#endif

void Rect::SetRect(int x, int y, int width, int height) {
  origin_.SetPoint(x, y);
  set_width(width);
  set_height(height);
}

void Rect::Inset(const gfx::Insets& insets) {
  Inset(insets.left(), insets.top(), insets.right(), insets.bottom());
}

void Rect::Inset(int left, int top, int right, int bottom) {
  Offset(left, top);
  set_width(std::max(width() - left - right, 0));
  set_height(std::max(height() - top - bottom, 0));
}

void Rect::Offset(int horizontal, int vertical) {
  origin_.Offset(horizontal, vertical);
}

bool Rect::operator==(const Rect& other) const {
  return origin_ == other.origin_ && size_ == other.size_;
}

bool Rect::operator<(const Rect& other) const {
  if (origin_ == other.origin_) {
    if (width() == other.width()) {
      return height() < other.height();
    } else {
      return width() < other.width();
    }
  } else {
    return origin_ < other.origin_;
  }
}

#if defined(OS_WIN)
RECT Rect::ToRECT() const {
  RECT r;
  r.left = x();
  r.right = right();
  r.top = y();
  r.bottom = bottom();
  return r;
}
#elif defined(OS_MACOSX)
CGRect Rect::ToCGRect() const {
  return CGRectMake(x(), y(), width(), height());
}
#elif defined(TOOLKIT_USES_GTK)
GdkRectangle Rect::ToGdkRectangle() const {
  GdkRectangle r = {x(), y(), width(), height()};
  return r;
}
#endif
#if defined(USE_WAYLAND)
cairo_rectangle_int_t Rect::ToCairoRectangle() const {
  cairo_rectangle_int_t r = {x(), y(), width(), height()};
  return r;
}
#endif

bool Rect::Contains(int point_x, int point_y) const {
  return (point_x >= x()) && (point_x < right()) &&
         (point_y >= y()) && (point_y < bottom());
}

bool Rect::Contains(const Rect& rect) const {
  return (rect.x() >= x() && rect.right() <= right() &&
          rect.y() >= y() && rect.bottom() <= bottom());
}

bool Rect::Intersects(const Rect& rect) const {
  return !(rect.x() >= right() || rect.right() <= x() ||
           rect.y() >= bottom() || rect.bottom() <= y());
}

Rect Rect::Intersect(const Rect& rect) const {
  int rx = std::max(x(), rect.x());
  int ry = std::max(y(), rect.y());
  int rr = std::min(right(), rect.right());
  int rb = std::min(bottom(), rect.bottom());

  if (rx >= rr || ry >= rb)
    rx = ry = rr = rb = 0;  // non-intersecting

  return Rect(rx, ry, rr - rx, rb - ry);
}

Rect Rect::Union(const Rect& rect) const {
  // special case empty rects...
  if (IsEmpty())
    return rect;
  if (rect.IsEmpty())
    return *this;

  int rx = std::min(x(), rect.x());
  int ry = std::min(y(), rect.y());
  int rr = std::max(right(), rect.right());
  int rb = std::max(bottom(), rect.bottom());

  return Rect(rx, ry, rr - rx, rb - ry);
}

Rect Rect::Subtract(const Rect& rect) const {
  // boundary cases:
  if (!Intersects(rect))
    return *this;
  if (rect.Contains(*this))
    return Rect();

  int rx = x();
  int ry = y();
  int rr = right();
  int rb = bottom();

  if (rect.y() <= y() && rect.bottom() >= bottom()) {
    // complete intersection in the y-direction
    if (rect.x() <= x()) {
      rx = rect.right();
    } else {
      rr = rect.x();
    }
  } else if (rect.x() <= x() && rect.right() >= right()) {
    // complete intersection in the x-direction
    if (rect.y() <= y()) {
      ry = rect.bottom();
    } else {
      rb = rect.y();
    }
  }
  return Rect(rx, ry, rr - rx, rb - ry);
}

Rect Rect::AdjustToFit(const Rect& rect) const {
  int new_x = x();
  int new_y = y();
  int new_width = width();
  int new_height = height();
  AdjustAlongAxis(rect.x(), rect.width(), &new_x, &new_width);
  AdjustAlongAxis(rect.y(), rect.height(), &new_y, &new_height);
  return Rect(new_x, new_y, new_width, new_height);
}

Point Rect::CenterPoint() const {
  return Point(x() + (width() - 1) / 2, y() + (height() - 1) / 2);
}

Rect Rect::Center(const gfx::Size& size) const {
  int new_width = std::min(width(), size.width());
  int new_height = std::min(height(), size.height());
  int new_x = x() + (width() - new_width) / 2;
  int new_y = y() + (height() - new_height) / 2;
  return Rect(new_x, new_y, new_width, new_height);
}

void Rect::SplitVertically(gfx::Rect* left_half, gfx::Rect* right_half) const {
  DCHECK(left_half);
  DCHECK(right_half);

  left_half->SetRect(this->x(), this->y(), this->width() / 2, this->height());
  right_half->SetRect(left_half->right(),
                      this->y(),
                      this->width() - left_half->width(),
                      this->height());
}

bool Rect::SharesEdgeWith(const gfx::Rect& rect) const {
  return (y() == rect.y() && height() == rect.height() &&
             (x() == rect.right() || right() == rect.x())) ||
         (x() == rect.x() && width() == rect.width() &&
             (y() == rect.bottom() || bottom() == rect.y()));
}

std::string Rect::ToString() const {
  return base::StringPrintf("%s %s",
                            origin_.ToString().c_str(),
                            size_.ToString().c_str());
}

}  // namespace gfx