// Copyright (c) 2012 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/views/controls/focusable_border.h"

#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkPath.h"
#include "ui/base/material_design/material_design_controller.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_palette.h"
#include "ui/gfx/color_utils.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/scoped_canvas.h"
#include "ui/gfx/skia_util.h"
#include "ui/native_theme/native_theme.h"
#include "ui/views/controls/textfield/textfield.h"

namespace {

const int kInsetSize = 1;

}  // namespace

namespace views {

FocusableBorder::FocusableBorder() : insets_(kInsetSize) {}

FocusableBorder::~FocusableBorder() {
}

void FocusableBorder::SetColorId(
    const base::Optional<ui::NativeTheme::ColorId>& color_id) {
  override_color_id_ = color_id;
}

void FocusableBorder::Paint(const View& view, gfx::Canvas* canvas) {
  // In harmony, the focus indicator is a FocusRing.
  if (ui::MaterialDesignController::IsSecondaryUiMaterial() && view.HasFocus())
    return;

  SkPaint paint;
  paint.setStyle(SkPaint::kStroke_Style);
  paint.setColor(GetCurrentColor(view));

  if (ui::MaterialDesignController::IsSecondaryUiMaterial()) {
    gfx::ScopedCanvas scoped(canvas);
    float dsf = canvas->UndoDeviceScaleFactor();
    // Scale the rect and snap to pixel boundaries.
    gfx::RectF rect(gfx::ScaleToEnclosingRect(view.GetLocalBounds(), dsf));
    rect.Inset(gfx::InsetsF(0.5f));
    SkPath path;
    float corner_radius_px = kCornerRadiusDp * dsf;
    path.addRoundRect(gfx::RectFToSkRect(rect), corner_radius_px,
                      corner_radius_px);
    const int kStrokeWidthPx = 1;
    paint.setStrokeWidth(SkIntToScalar(kStrokeWidthPx));
    paint.setAntiAlias(true);
    canvas->DrawPath(path, paint);
  } else {
    SkPath path;
    path.addRect(gfx::RectToSkRect(view.GetLocalBounds()),
                 SkPath::kCW_Direction);
    paint.setStrokeWidth(SkIntToScalar(2));
    canvas->DrawPath(path, paint);
  }
}

gfx::Insets FocusableBorder::GetInsets() const {
  return insets_;
}

gfx::Size FocusableBorder::GetMinimumSize() const {
  return gfx::Size();
}

void FocusableBorder::SetInsets(int top, int left, int bottom, int right) {
  insets_.Set(top, left, bottom, right);
}

SkColor FocusableBorder::GetCurrentColor(const View& view) const {
  ui::NativeTheme::ColorId color_id =
      ui::NativeTheme::kColorId_UnfocusedBorderColor;
  if (override_color_id_)
    color_id = *override_color_id_;
  else if (view.HasFocus())
    color_id = ui::NativeTheme::kColorId_FocusedBorderColor;

  SkColor color = view.GetNativeTheme()->GetSystemColor(color_id);
  if (ui::MaterialDesignController::IsSecondaryUiMaterial() &&
      !view.enabled()) {
    return color_utils::BlendTowardOppositeLuma(color,
                                                gfx::kDisabledControlAlpha);
  }
  return color;
}

}  // namespace views