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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use crate::dom::attr::Attr;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::root::{DomRoot, LayoutDom};
use crate::dom::bindings::str::DOMString;
use crate::dom::document::Document;
use crate::dom::element::{AttributeMutation, Element, LayoutElementHelpers};
use crate::dom::node::Node;
use crate::dom::svggraphicselement::SVGGraphicsElement;
use crate::dom::virtualmethods::VirtualMethods;
use dom_struct::dom_struct;
use html5ever::{LocalName, Prefix};
use script_layout_interface::SVGSVGData;
use style::attr::AttrValue;

const DEFAULT_WIDTH: u32 = 300;
const DEFAULT_HEIGHT: u32 = 150;

#[dom_struct]
pub struct SVGSVGElement {
    svggraphicselement: SVGGraphicsElement,
}

impl SVGSVGElement {
    fn new_inherited(
        local_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
    ) -> SVGSVGElement {
        SVGSVGElement {
            svggraphicselement: SVGGraphicsElement::new_inherited(local_name, prefix, document),
        }
    }

    #[allow(unrooted_must_root)]
    pub fn new(
        local_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
    ) -> DomRoot<SVGSVGElement> {
        Node::reflect_node(
            Box::new(SVGSVGElement::new_inherited(local_name, prefix, document)),
            document,
        )
    }
}

pub trait LayoutSVGSVGElementHelpers {
    fn data(self) -> SVGSVGData;
}

impl LayoutSVGSVGElementHelpers for LayoutDom<'_, SVGSVGElement> {
    fn data(self) -> SVGSVGData {
        let width_attr = self
            .upcast::<Element>()
            .get_attr_for_layout(&ns!(), &local_name!("width"));
        let height_attr = self
            .upcast::<Element>()
            .get_attr_for_layout(&ns!(), &local_name!("height"));
        SVGSVGData {
            width: width_attr.map_or(DEFAULT_WIDTH, |val| val.as_uint()),
            height: height_attr.map_or(DEFAULT_HEIGHT, |val| val.as_uint()),
        }
    }
}

impl VirtualMethods for SVGSVGElement {
    fn super_type(&self) -> Option<&dyn VirtualMethods> {
        Some(self.upcast::<SVGGraphicsElement>() as &dyn VirtualMethods)
    }

    fn attribute_mutated(&self, attr: &Attr, mutation: AttributeMutation) {
        self.super_type().unwrap().attribute_mutated(attr, mutation);
    }

    fn parse_plain_attribute(&self, name: &LocalName, value: DOMString) -> AttrValue {
        match name {
            &local_name!("width") => AttrValue::from_u32(value.into(), DEFAULT_WIDTH),
            &local_name!("height") => AttrValue::from_u32(value.into(), DEFAULT_HEIGHT),
            _ => self
                .super_type()
                .unwrap()
                .parse_plain_attribute(name, value),
        }
    }
}