/*
 * 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,
 * 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/StylePrimitiveNumericTypes.h>

namespace WebCore {

namespace CSS {
struct MaskBorderOutset;
}

namespace Style {

// <mask-border-outset-value> = <length [0,∞]> | <number [0,∞]>
struct MaskBorderOutsetValue {
    using Length = Style::Length<CSS::Nonnegative, float>;
    using Number = Style::Number<CSS::Nonnegative, float>;

    constexpr MaskBorderOutsetValue(Length length)
        : m_value { length }
    {
    }
    constexpr MaskBorderOutsetValue(CSS::ValueLiteral<CSS::LengthUnit::Px> literal)
        : m_value { Length { literal } }
    {
    }
    constexpr MaskBorderOutsetValue(Number number)
        : m_value { number }
    {
    }
    constexpr MaskBorderOutsetValue(CSS::ValueLiteral<CSS::NumberUnit::Number> literal)
        : m_value { Number { literal } }
    {
    }

    constexpr bool isLength() const { return WTF::holdsAlternative<Length>(m_value); }
    constexpr bool isNumber() const { return WTF::holdsAlternative<Number>(m_value); }

    template<typename... F> constexpr decltype(auto) switchOn(F&&... f) const
    {
        return WTF::switchOn(m_value, std::forward<F>(f)...);
    }

    constexpr bool isZero() const
    {
        return switchOn([&](auto& value) { return value == 0; });
    }

    constexpr bool operator==(const MaskBorderOutsetValue&) const = default;

    constexpr bool hasSameType(const MaskBorderOutsetValue& other) const { return m_value.index() == other.m_value.index(); }

private:
    friend struct Blending<MaskBorderOutsetValue>;

    Variant<Length, Number> m_value { Number { 0 } };
};

// <'mask-border-outset'> = [ <length [0,∞]> | <number [0,∞]> ]{1,4}
// https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-outset
struct MaskBorderOutset {
    using Value = MaskBorderOutsetValue;
    using Edges = MinimallySerializingSpaceSeparatedRectEdges<Value>;

    Edges values { Value { Value::Number { 0 } } };

    MaskBorderOutset(Edges values)
        : values { WTF::move(values) }
    {
    }
    MaskBorderOutset(Value top, Value right, Value bottom, Value left)
        : values { top, right, bottom, left }
    {
    }
    MaskBorderOutset(Value value)
        : values { WTF::move(value) }
    {
    }
    MaskBorderOutset(Value::Length length)
        : values { length }
    {
    }
    MaskBorderOutset(CSS::ValueLiteral<CSS::LengthUnit::Px> literal)
        : values { Value::Length { literal } }
    {
    }
    MaskBorderOutset(Value::Number number)
        : values { number }
    {
    }
    MaskBorderOutset(CSS::ValueLiteral<CSS::NumberUnit::Number> literal)
        : values { Value::Number { literal } }
    {
    }

    bool isZero() const
    {
        return values.allOf([](auto& edge) { return edge.isZero(); });
    }

    bool operator==(const MaskBorderOutset&) const = default;
};
DEFINE_TYPE_WRAPPER_GET(MaskBorderOutset, values);

// MARK: - Conversion

template<> struct ToCSS<MaskBorderOutset> { auto operator()(const MaskBorderOutset&, const Style::ComputedStyle&) -> CSS::MaskBorderOutset; };
template<> struct ToStyle<CSS::MaskBorderOutset> { auto operator()(const CSS::MaskBorderOutset&, const BuilderState&) -> MaskBorderOutset; };

template<> struct CSSValueConversion<MaskBorderOutset> { auto operator()(BuilderState&, const CSSValue&) -> MaskBorderOutset; };
template<> struct CSSValueCreation<MaskBorderOutset> { auto operator()(CSSValuePool&, const Style::ComputedStyle&, const MaskBorderOutset&) -> Ref<CSSValue>; };

// MARK: - Blending

template<> struct Blending<MaskBorderOutsetValue> {
    bool NODELETE canBlend(const MaskBorderOutsetValue&, const MaskBorderOutsetValue&);
    bool NODELETE requiresInterpolationForAccumulativeIteration(const MaskBorderOutsetValue&, const MaskBorderOutsetValue&);
    auto blend(const MaskBorderOutsetValue&, const MaskBorderOutsetValue&, const BlendingContext&) -> MaskBorderOutsetValue;
};

template<> struct Blending<MaskBorderOutset> {
    auto canBlend(const MaskBorderOutset&, const MaskBorderOutset&) -> bool;
    auto requiresInterpolationForAccumulativeIteration(const MaskBorderOutset&, const MaskBorderOutset&) -> bool;
    auto blend(const MaskBorderOutset&, const MaskBorderOutset&, const BlendingContext&) -> MaskBorderOutset;
};

} // namespace Style
} // namespace WebCore

DEFINE_TUPLE_LIKE_CONFORMANCE_FOR_TYPE_WRAPPER(WebCore::Style::MaskBorderOutset)
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::MaskBorderOutsetValue)
