/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 * Copyright (C) 2026 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:
 *
 *     * 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,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR 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 <WebCore/CSSPrimitiveNumericRange.h>
#include <WebCore/CSSPropertyNames.h>
#include <WebCore/Element.h>
#include <optional>
#include <wtf/Assertions.h>

namespace WebCore {

class Element;
class FloatSize;
class FontCascade;
class RenderView;

namespace Style {
class BuilderState;
class ComputedStyle;
}

class CSSToLengthConversionData {
public:
    CSSToLengthConversionData();
    CSSToLengthConversionData(const CSSToLengthConversionData&);
    CSSToLengthConversionData(CSSToLengthConversionData&&);

    // This is used during style building. The 'zoom' property is taken into account.
    CSSToLengthConversionData(const Style::ComputedStyle&, Style::BuilderState&);
    // This constructor ignores the `zoom` property.
    CSSToLengthConversionData(const Style::ComputedStyle&, const Style::ComputedStyle* rootStyle, const Style::ComputedStyle* parentStyle, const RenderView*, const Element* elementForContainerUnitResolution = nullptr, CSS::RangeZoomOptions = CSS::RangeZoomOptions::Default);

    // Used for resolutions that don't take place during normal style resolution.
    static std::optional<CSSToLengthConversionData> tryCreateForNonStyleBuildingResolution(Element&);
    static std::optional<CSSToLengthConversionData> tryCreateForNonStyleBuildingResolution(Element*);

    WEBCORE_EXPORT ~CSSToLengthConversionData();

    const Style::ComputedStyle* style() const { return m_style; }
    const Style::ComputedStyle* rootStyle() const { return m_rootStyle; }
    const Style::ComputedStyle* parentStyle() const { return m_parentStyle; }
    float NODELETE zoom() const;
    CSS::RangeZoomOptions rangeZoomOption() const { return m_rangeZoomOption; }
    bool computingFontSize() const { return m_propertyToCompute == CSSPropertyFontSize; }
    bool computingLineHeight() const { return m_propertyToCompute == CSSPropertyLineHeight; }
    CSSPropertyID propertyToCompute() const { return m_propertyToCompute.value_or(CSSPropertyInvalid); }
    bool NODELETE evaluationTimeZoomEnabled() const;
    const RenderView* renderView() const { return m_renderView; }
    const Element* elementForContainerUnitResolution() const { return m_elementForContainerUnitResolution.get(); }

    const FontCascade& NODELETE fontCascadeForFontUnits() const;

    FloatSize defaultViewportFactor() const;
    FloatSize smallViewportFactor() const;
    FloatSize largeViewportFactor() const;
    FloatSize dynamicViewportFactor() const;

    CSSToLengthConversionData copyForFontSize() const
    {
        CSSToLengthConversionData copy(*this);
        copy.m_zoom = 1.f;
        copy.m_propertyToCompute = CSSPropertyFontSize;
        return copy;
    };

    CSSToLengthConversionData copyWithAdjustedZoom(float zoom, CSS::RangeZoomOptions rangeZoomOption = CSS::RangeZoomOptions::Default) const
    {
        CSSToLengthConversionData copy(*this);
        copy.m_zoom = zoom;
        copy.m_rangeZoomOption = rangeZoomOption;
        return copy;
    }

    CSSToLengthConversionData copyForLineHeight(float zoom) const
    {
        CSSToLengthConversionData copy(*this);
        copy.m_zoom = zoom;
        copy.m_propertyToCompute = CSSPropertyLineHeight;
        copy.m_rangeZoomOption = CSS::RangeZoomOptions::Unzoomed;
        return copy;
    }

    void NODELETE setUsesContainerUnits() const;

    Style::BuilderState* styleBuilderState() const { return m_styleBuilderState.get(); }

private:
    const Style::ComputedStyle* m_style { nullptr };
    const Style::ComputedStyle* m_rootStyle { nullptr };
    const Style::ComputedStyle* m_parentStyle { nullptr };
    const RenderView* m_renderView { nullptr };
    RefPtr<const Element> m_elementForContainerUnitResolution;
    std::optional<float> m_zoom;
    std::optional<CSSPropertyID> m_propertyToCompute;
    CheckedPtr<Style::BuilderState> m_styleBuilderState;
    CSS::RangeZoomOptions m_rangeZoomOption { CSS::RangeZoomOptions::Default };
};

} // namespace WebCore
