// Copyright (c) 2006-2008 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 "base/gfx/rect.h"

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

#include "base/logging.h"

namespace {

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

} // namespace

namespace gfx {

Rect::Rect() {
}

Rect::Rect(int width, int height) {
  set_width(width);
  set_height(height);
}

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

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

Rect& Rect::operator=(const RECT& r) {
  origin_.SetPoint(r.left, r.top);
  set_width(r.right - r.left);
  set_height(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;
}
#endif

void Rect::set_width(int width) {
  if (width < 0) {
    NOTREACHED();
    width = 0;
  }

  size_.set_width(width);
}
void Rect::set_height(int height) {
  if (height < 0) {
    NOTREACHED();
    height = 0;
  }

  size_.set_height(height);
}

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

void Rect::Inset(int horizontal, int vertical) {
  set_x(x() + horizontal);
  set_y(y() + vertical);
  set_width(std::max(width() - (horizontal * 2), 0));
  set_height(std::max(height() - (vertical * 2), 0));
}

void Rect::Offset(int horizontal, int vertical) {
  set_x(x() + horizontal);
  set_y(y() + vertical);
}

bool Rect::IsEmpty() const {
  return width() == 0 || height() == 0;
}

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

#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());
}
#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);
}

}  // namespace gfx