/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "StyleInfo.h"

#include "mozilla/dom/Element.h"
#include "nsComputedDOMStyle.h"
#include "nsCSSProps.h"
#include "nsIFrame.h"

using namespace mozilla;
using namespace mozilla::a11y;

StyleInfo::StyleInfo(dom::Element* aElement) : mElement(aElement) {
  mComputedStyle =
      nsComputedDOMStyle::GetComputedStyleNoFlush(aElement, nullptr);
}

void StyleInfo::Display(nsAString& aValue) {
  aValue.Truncate();
  Servo_GetPropertyValue(mComputedStyle, eCSSProperty_display, &aValue);
}

void StyleInfo::TextAlign(nsAString& aValue) {
  aValue.Truncate();
  AppendASCIItoUTF16(
      nsCSSProps::ValueToKeyword(mComputedStyle->StyleText()->mTextAlign,
                                 nsCSSProps::kTextAlignKTable),
      aValue);
}

void StyleInfo::TextIndent(nsAString& aValue) {
  aValue.Truncate();

  const auto& textIndent = mComputedStyle->StyleText()->mTextIndent;
  if (textIndent.ConvertsToLength()) {
    aValue.AppendFloat(textIndent.LengthInCSSPixels());
    aValue.AppendLiteral("px");
    return;
  }
  if (textIndent.ConvertsToPercentage()) {
    aValue.AppendFloat(textIndent.ToPercentage() * 100);
    aValue.AppendLiteral("%");
    return;
  }
  // FIXME: This doesn't handle calc in any meaningful way?
  aValue.AppendLiteral("0px");
}

void StyleInfo::Margin(Side aSide, nsAString& aValue) {
  MOZ_ASSERT(mElement->GetPrimaryFrame(),
             " mElement->GetPrimaryFrame() needs to be valid pointer");
  aValue.Truncate();

  nscoord coordVal = mElement->GetPrimaryFrame()->GetUsedMargin().Side(aSide);
  aValue.AppendFloat(nsPresContext::AppUnitsToFloatCSSPixels(coordVal));
  aValue.AppendLiteral("px");
}

void StyleInfo::FormatColor(const nscolor& aValue, nsString& aFormattedValue) {
  // Combine the string like rgb(R, G, B) from nscolor.
  aFormattedValue.AppendLiteral("rgb(");
  aFormattedValue.AppendInt(NS_GET_R(aValue));
  aFormattedValue.AppendLiteral(", ");
  aFormattedValue.AppendInt(NS_GET_G(aValue));
  aFormattedValue.AppendLiteral(", ");
  aFormattedValue.AppendInt(NS_GET_B(aValue));
  aFormattedValue.Append(')');
}

void StyleInfo::FormatTextDecorationStyle(uint8_t aValue,
                                          nsAString& aFormattedValue) {
  nsCSSKeyword keyword = nsCSSProps::ValueToKeywordEnum(
      aValue, nsCSSProps::kTextDecorationStyleKTable);
  AppendUTF8toUTF16(nsCSSKeywords::GetStringValue(keyword), aFormattedValue);
}