/*
 * Copyright (C) 2014 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "third_party/blink/renderer/core/svg/svg_number.h"

#include "third_party/blink/renderer/core/svg/animation/smil_animation_effect_parameters.h"
#include "third_party/blink/renderer/core/svg/svg_parser_utilities.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/wtf/text/character_visitor.h"
#include "third_party/blink/renderer/platform/wtf/text/parsing_utilities.h"

namespace blink {

SVGNumber::SVGNumber(float value) : value_(value) {}

SVGNumber* SVGNumber::Clone() const {
  return MakeGarbageCollected<SVGNumber>(value_);
}

String SVGNumber::ValueAsString() const {
  return String::Number(value_);
}

template <typename CharType>
SVGParsingError SVGNumber::Parse(base::span<const CharType> span) {
  const size_t start_size = span.size();
  float value = 0;
  if (!ParseNumber(span, value, kAllowLeadingAndTrailingWhitespace)) {
    return SVGParsingError(SVGParseStatus::kExpectedNumber,
                           start_size - span.size());
  }
  if (!span.empty()) {
    return SVGParsingError(SVGParseStatus::kTrailingGarbage,
                           start_size - span.size());
  }
  value_ = value;
  return SVGParseStatus::kNoError;
}

SVGParsingError SVGNumber::SetValueAsString(const String& string) {
  value_ = 0;

  if (string.empty())
    return SVGParseStatus::kNoError;

  return VisitCharacters(string, [&](auto chars) { return Parse(chars); });
}

bool SVGNumber::Add(const SVGPropertyBase* other, const SVGElement*) {
  SetValue(value_ + To<SVGNumber>(other)->Value());
  return true;
}

void SVGNumber::CalculateAnimatedValue(
    const SMILAnimationEffectParameters& parameters,
    float percentage,
    unsigned repeat_count,
    const SVGPropertyBase* from,
    const SVGPropertyBase* to,
    const SVGPropertyBase* to_at_end_of_duration,
    const SVGElement*) {
  auto* from_number = To<SVGNumber>(from);
  auto* to_number = To<SVGNumber>(to);
  auto* to_at_end_of_duration_number = To<SVGNumber>(to_at_end_of_duration);

  float result = ComputeAnimatedNumber(parameters, percentage, repeat_count,
                                       from_number->Value(), to_number->Value(),
                                       to_at_end_of_duration_number->Value());
  if (parameters.is_additive)
    result += value_;

  value_ = result;
}

float SVGNumber::CalculateDistance(const SVGPropertyBase* other,
                                   const SVGElement*) const {
  return fabsf(value_ - To<SVGNumber>(other)->Value());
}

SVGNumber* SVGNumberAcceptPercentage::Clone() const {
  return MakeGarbageCollected<SVGNumberAcceptPercentage>(value_);
}

template <typename CharType>
static SVGParsingError ParseNumberOrPercentage(base::span<const CharType> span,
                                               float& number) {
  const size_t start_size = span.size();
  if (!ParseNumber(span, number, kAllowLeadingWhitespace)) {
    return SVGParsingError(SVGParseStatus::kExpectedNumberOrPercentage,
                           start_size - span.size());
  }
  if (SkipExactly<CharType>(span, '%')) {
    number /= 100;
  }
  if (SkipOptionalSVGSpaces(span)) {
    return SVGParsingError(SVGParseStatus::kTrailingGarbage,
                           start_size - span.size());
  }
  return SVGParseStatus::kNoError;
}

SVGParsingError SVGNumberAcceptPercentage::SetValueAsString(
    const String& string) {
  value_ = 0;

  if (string.empty())
    return SVGParseStatus::kExpectedNumberOrPercentage;

  float number = 0;
  SVGParsingError error = VisitCharacters(string, [&](auto chars) {
    return ParseNumberOrPercentage(chars, number);
  });
  if (error == SVGParseStatus::kNoError)
    value_ = number;
  return error;
}

SVGNumberAcceptPercentage::SVGNumberAcceptPercentage(float value)
    : SVGNumber(value) {}

}  // namespace blink