/*

 * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <LibWeb/Bindings/Intrinsics.h>

#include <LibWeb/Bindings/SVGCircleElementPrototype.h>

#include <LibWeb/CSS/Parser/Parser.h>

#include <LibWeb/Layout/Node.h>

#include <LibWeb/SVG/AttributeNames.h>

#include <LibWeb/SVG/AttributeParser.h>

#include <LibWeb/SVG/SVGCircleElement.h>

#include <LibWeb/SVG/SVGViewport.h>

namespace Web::SVG {

JS_DEFINE_ALLOCATOR(SVGCircleElement);

SVGCircleElement::SVGCircleElement(DOM::Document& document, DOM::QualifiedName qualified_name)

    : SVGGeometryElement(document, qualified_name)

{

}

void SVGCircleElement::initialize(JS::Realm& realm)

{

    Base::initialize(realm);

    WEB_SET_PROTOTYPE_FOR_INTERFACE(SVGCircleElement);

}

void SVGCircleElement::apply_presentational_hints(CSS::StyleProperties& style) const

{

    Base::apply_presentational_hints(style);

    auto parsing_context = CSS::Parser::ParsingContext { document(), CSS::Parser::ParsingContext::Mode::SVGPresentationAttribute };

    auto cx_attribute = attribute(SVG::AttributeNames::cx);

    if (auto cx_value = parse_css_value(parsing_context, cx_attribute.value_or(String {}), CSS::PropertyID::Cx))

        style.set_property(CSS::PropertyID::Cx, cx_value.release_nonnull());

    auto cy_attribute = attribute(SVG::AttributeNames::cy);

    if (auto cy_value = parse_css_value(parsing_context, cy_attribute.value_or(String {}), CSS::PropertyID::Cy))

        style.set_property(CSS::PropertyID::Cy, cy_value.release_nonnull());

    auto r_attribute = attribute(SVG::AttributeNames::r);

    if (auto r_value = parse_css_value(parsing_context, r_attribute.value_or(String {}), CSS::PropertyID::R))

        style.set_property(CSS::PropertyID::R, r_value.release_nonnull());

}

Gfx::Path SVGCircleElement::get_path(CSSPixelSize viewport_size)

{

    auto node = layout_node();

    auto cx = float(node->computed_values().cx().to_px(*node, viewport_size.width()));

    auto cy = float(node->computed_values().cy().to_px(*node, viewport_size.height()));

    // Percentages refer to the normalized diagonal of the current SVG viewport

    // (see Units: https://svgwg.org/svg2-draft/coords.html#Units)

    auto r = float(node->computed_values().r().to_px(*node, normalized_diagonal_length(viewport_size)));

    // A zero radius disables rendering.

    if (r == 0)

        return {};

    Gfx::Path path;

    bool large_arc = false;

    bool sweep = true;

    // 1. A move-to command to the point cx+r,cy;

    path.move_to({ cx + r, cy });

    // 2. arc to cx,cy+r;

    path.arc_to({ cx, cy + r }, r, large_arc, sweep);

    // 3. arc to cx-r,cy;

    path.arc_to({ cx - r, cy }, r, large_arc, sweep);

    // 4. arc to cx,cy-r;

    path.arc_to({ cx, cy - r }, r, large_arc, sweep);

    // 5. arc with a segment-completing close path operation.

    path.arc_to({ cx + r, cy }, r, large_arc, sweep);

    return path;

}

// https://www.w3.org/TR/SVG11/shapes.html#CircleElementCXAttribute

JS::NonnullGCPtr<SVGAnimatedLength> SVGCircleElement::cx() const

{

    return svg_animated_length_for_property(CSS::PropertyID::Cx);

}

// https://www.w3.org/TR/SVG11/shapes.html#CircleElementCYAttribute

JS::NonnullGCPtr<SVGAnimatedLength> SVGCircleElement::cy() const

{

    return svg_animated_length_for_property(CSS::PropertyID::Cy);

}

// https://www.w3.org/TR/SVG11/shapes.html#CircleElementRAttribute

JS::NonnullGCPtr<SVGAnimatedLength> SVGCircleElement::r() const

{

    return svg_animated_length_for_property(CSS::PropertyID::R);

}

}