/*
 * Copyright (c) 2025, Jelle Raaijmakers <jelle@ladybird.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibWeb/Bindings/SVGComponentTransferFunctionElementPrototype.h>
#include <LibWeb/SVG/AttributeNames.h>
#include <LibWeb/SVG/AttributeParser.h>
#include <LibWeb/SVG/SVGComponentTransferFunctionElement.h>
#include <LibWeb/SVG/SVGNumber.h>
#include <LibWeb/SVG/SVGNumberList.h>

namespace Web::SVG {

SVGComponentTransferFunctionElement::SVGComponentTransferFunctionElement(DOM::Document& document, DOM::QualifiedName qualified_name)
    : SVGElement(document, move(qualified_name))
{
}

// https://drafts.fxtf.org/filter-effects-1/#element-attrdef-fecomponenttransfer-type
static SVGComponentTransferFunctionElement::Type parse_type(Optional<String> const& value)
{
    if (value == "identity"sv)
        return SVGComponentTransferFunctionElement::Type::Identity;
    if (value == "table"sv)
        return SVGComponentTransferFunctionElement::Type::Table;
    if (value == "discrete"sv)
        return SVGComponentTransferFunctionElement::Type::Discrete;
    if (value == "linear"sv)
        return SVGComponentTransferFunctionElement::Type::Linear;
    if (value == "gamma"sv)
        return SVGComponentTransferFunctionElement::Type::Gamma;

    return SVGComponentTransferFunctionElement::Type::Unknown;
}

void SVGComponentTransferFunctionElement::attribute_changed(FlyString const& name, Optional<String> const& old_value,
    Optional<String> const& value, Optional<FlyString> const& namespace_)
{
    Base::attribute_changed(name, old_value, value, namespace_);

    // FIXME: Support reflection instead of invalidating the enumeration.
    if (name == AttributeNames::type)
        m_type = {};

    // FIXME: Support reflection instead of invalidating the list.
    if (name == AttributeNames::tableValues)
        m_table_values = {};
}

void SVGComponentTransferFunctionElement::initialize(JS::Realm& realm)
{
    WEB_SET_PROTOTYPE_FOR_INTERFACE(SVGComponentTransferFunctionElement);
    Base::initialize(realm);
}

void SVGComponentTransferFunctionElement::visit_edges(Visitor& visitor)
{
    Base::visit_edges(visitor);
    visitor.visit(m_type);
    visitor.visit(m_table_values);
    visitor.visit(m_slope);
    visitor.visit(m_intercept);
    visitor.visit(m_amplitude);
    visitor.visit(m_exponent);
    visitor.visit(m_offset);
}

// https://www.w3.org/TR/filter-effects-1/#dom-svgcomponenttransferfunctionelement-type
// https://drafts.fxtf.org/filter-effects-1/#element-attrdef-fecomponenttransfer-type
GC::Ref<SVGAnimatedEnumeration> SVGComponentTransferFunctionElement::type()
{
    if (!m_type)
        m_type = SVGAnimatedEnumeration::create(realm(), to_underlying(type_from_attribute()));
    return *m_type;
}

// https://www.w3.org/TR/filter-effects-1/#dom-svgcomponenttransferfunctionelement-tablevalues
// https://drafts.fxtf.org/filter-effects-1/#element-attrdef-fecomponenttransfer-tablevalues
GC::Ref<SVGAnimatedNumberList> SVGComponentTransferFunctionElement::table_values()
{
    if (!m_table_values) {
        auto numbers = AttributeParser::parse_table_values(get_attribute_value(AttributeNames::tableValues));

        Vector<GC::Ref<SVGNumber>> items;
        items.ensure_capacity(numbers.size());
        for (auto number : numbers)
            items.unchecked_append(SVGNumber::create(realm(), number, SVGNumber::ReadOnly::Yes));

        auto number_list = SVGNumberList::create(realm(), move(items), ReadOnlyList::Yes);
        m_table_values = SVGAnimatedNumberList::create(realm(), number_list);
    }
    return *m_table_values;
}

// https://www.w3.org/TR/filter-effects-1/#dom-svgcomponenttransferfunctionelement-slope
// https://drafts.fxtf.org/filter-effects-1/#element-attrdef-fecomponenttransfer-slope
GC::Ref<SVGAnimatedNumber> SVGComponentTransferFunctionElement::slope()
{
    if (!m_slope)
        m_slope = SVGAnimatedNumber::create(realm(), *this, DOM::QualifiedName { AttributeNames::slope, {}, {} }, 1.f);
    return *m_slope;
}

// https://www.w3.org/TR/filter-effects-1/#dom-svgcomponenttransferfunctionelement-intercept
// https://drafts.fxtf.org/filter-effects-1/#element-attrdef-fecomponenttransfer-intercept
GC::Ref<SVGAnimatedNumber> SVGComponentTransferFunctionElement::intercept()
{
    if (!m_intercept)
        m_intercept = SVGAnimatedNumber::create(realm(), *this, DOM::QualifiedName { AttributeNames::intercept, {}, {} }, 0.f);
    return *m_intercept;
}

// https://www.w3.org/TR/filter-effects-1/#dom-svgcomponenttransferfunctionelement-amplitude
// https://drafts.fxtf.org/filter-effects-1/#element-attrdef-fecomponenttransfer-amplitude
GC::Ref<SVGAnimatedNumber> SVGComponentTransferFunctionElement::amplitude()
{
    if (!m_amplitude)
        m_amplitude = SVGAnimatedNumber::create(realm(), *this, DOM::QualifiedName { AttributeNames::amplitude, {}, {} }, 1.f);
    return *m_amplitude;
}

// https://www.w3.org/TR/filter-effects-1/#dom-svgcomponenttransferfunctionelement-exponent
// https://drafts.fxtf.org/filter-effects-1/#element-attrdef-fecomponenttransfer-exponent
GC::Ref<SVGAnimatedNumber> SVGComponentTransferFunctionElement::exponent()
{
    if (!m_exponent)
        m_exponent = SVGAnimatedNumber::create(realm(), *this, DOM::QualifiedName { AttributeNames::exponent, {}, {} }, 1.f);
    return *m_exponent;
}

// https://www.w3.org/TR/filter-effects-1/#dom-svgcomponenttransferfunctionelement-offset
// https://drafts.fxtf.org/filter-effects-1/#element-attrdef-fecomponenttransfer-offset
GC::Ref<SVGAnimatedNumber> SVGComponentTransferFunctionElement::offset()
{
    if (!m_offset)
        m_offset = SVGAnimatedNumber::create(realm(), *this, DOM::QualifiedName { AttributeNames::offset, {}, {} }, 0.f);
    return *m_offset;
}

SVGComponentTransferFunctionElement::Type SVGComponentTransferFunctionElement::type_from_attribute() const
{
    return parse_type(get_attribute_value(AttributeNames::type));
}

}