/*
 * Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "Element.h"
#include "StyleLengthWrapper+CSSValueConversion.h"

namespace WebCore {
namespace Style {

// MARK: - Deprecated Conversions

std::optional<CSSToLengthConversionData> deprecatedLengthConversionCreateCSSToLengthConversionData(RefPtr<Element>);

template<LengthWrapperBaseDerived T> struct DeprecatedCSSValueConversion<T> {
    auto operator()(const RefPtr<Element>& element, const CSSPrimitiveValue& primitiveValue) -> std::optional<T>
    {
        using namespace CSS::Literals;

        auto conversionData = deprecatedLengthConversionCreateCSSToLengthConversionData(element);
        if (!conversionData) {
            if (primitiveValue.isCalculated())
                return std::nullopt;

            if (primitiveValue.isPx()) {
                return T {
                    typename T::Fixed {
                        CSS::clampToRange<T::Fixed::range, float>(primitiveValue.resolveAsLengthNoConversionDataRequired(), minValueForCssLength, maxValueForCssLength),
                    },
                    primitiveValue.primitiveType() == CSSUnitType::CSS_QUIRKY_EM
                };
            }

            if (primitiveValue.isPercentage()) {
                return T {
                    typename T::Percentage {
                        CSS::clampToRange<T::Percentage::range, float>(primitiveValue.resolveAsPercentageNoConversionDataRequired()),
                    }
                };
            }

            return std::nullopt;
        }

        if (primitiveValue.isLength()) {
            return T {
                typename T::Fixed {
                    CSS::clampToRange<T::Fixed::range, float>(primitiveValue.resolveAsLength(*conversionData), minValueForCssLength, maxValueForCssLength),
                },
                primitiveValue.primitiveType() == CSSUnitType::CSS_QUIRKY_EM
            };
        }

        if (primitiveValue.isPercentage()) {
            return T {
                typename T::Percentage {
                    CSS::clampToRange<T::Percentage::range, float>(primitiveValue.resolveAsPercentage(*conversionData)),
                }
            };
        }

        if (primitiveValue.isCalculatedPercentageWithLength()) {
            return T {
                typename T::Calc {
                    protect(primitiveValue.cssCalcValue())->createCalculationValue(*conversionData, CSSCalcSymbolTable { })
                }
            };
        }

        return std::nullopt;
    }

    auto operator()(const RefPtr<Element>&, const CSSKeywordValue& keywordValue) -> std::optional<T>
    {
        auto valueID = keywordValue.valueID();

        constexpr auto keywordsTuple = T::Keywords::tuple;

        auto result = std::apply([&](const auto& ...keyword) {
            std::optional<T> result;
            (CSSValueConversion<T>::processKeyword(keyword, valueID, result) || ...);
            return result;
        }, keywordsTuple);

        return result;
    }

    auto operator()(const RefPtr<Element>& element, const CSSValue& value) -> std::optional<T>
    {
        using namespace CSS::Literals;

        if constexpr (!T::Keywords::count) {
            RefPtr primitiveValue = dynamicDowncast<CSSPrimitiveValue>(value);
            if (!primitiveValue)
                return std::nullopt;
            return this->operator()(element, *primitiveValue);
        } else {
            if (RefPtr primitiveValue = dynamicDowncast<CSSPrimitiveValue>(value))
                return this->operator()(element, *primitiveValue);

            RefPtr keywordValue = dynamicDowncast<CSSKeywordValue>(value);
            if (!keywordValue)
                return std::nullopt;
            return this->operator()(element, *keywordValue);
        }
    }
};

} // namespace Style
} // namespace WebCore
