/* 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::bindings::codegen::Bindings::StyleSheetListBinding;
use crate::dom::bindings::codegen::Bindings::StyleSheetListBinding::StyleSheetListMethods;
use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::trace::JSTraceable;
use crate::dom::cssstylesheet::CSSStyleSheet;
use crate::dom::element::Element;
use crate::dom::stylesheet::StyleSheet;
use crate::dom::window::Window;
use dom_struct::dom_struct;
use servo_arc::Arc;
use style::stylesheets::Stylesheet;

pub trait StyleSheetListOwner: JSTraceable {
    fn stylesheet_count(&self) -> usize;
    fn stylesheet_at(&self, index: usize) -> Option<DomRoot<CSSStyleSheet>>;
    fn add_stylesheet(&self, owner: &Element, sheet: Arc<Stylesheet>);
    fn remove_stylesheet(&self, owner: &Element, s: &Arc<Stylesheet>);
    fn invalidate_stylesheets(&self);
}

#[dom_struct]
pub struct StyleSheetList {
    reflector_: Reflector,
    #[ignore_malloc_size_of = "trait object"]
    document_or_shadow_root: Box<StyleSheetListOwner>,
}

impl StyleSheetList {
    fn new_inherited(doc_or_sr: Box<StyleSheetListOwner>) -> StyleSheetList {
        StyleSheetList {
            reflector_: Reflector::new(),
            document_or_shadow_root: doc_or_sr,
        }
    }

    #[allow(unrooted_must_root)]
    pub fn new(window: &Window, doc_or_sr: Box<StyleSheetListOwner>) -> DomRoot<StyleSheetList> {
        reflect_dom_object(
            Box::new(StyleSheetList::new_inherited(doc_or_sr)),
            window,
            StyleSheetListBinding::Wrap,
        )
    }
}

impl StyleSheetListMethods for StyleSheetList {
    // https://drafts.csswg.org/cssom/#dom-stylesheetlist-length
    fn Length(&self) -> u32 {
        self.document_or_shadow_root.stylesheet_count() as u32
    }

    // https://drafts.csswg.org/cssom/#dom-stylesheetlist-item
    fn Item(&self, index: u32) -> Option<DomRoot<StyleSheet>> {
        // XXXManishearth this  doesn't handle the origin clean flag and is a
        // cors vulnerability
        self.document_or_shadow_root
            .stylesheet_at(index as usize)
            .map(DomRoot::upcast)
    }

    // check-tidy: no specs after this line
    fn IndexedGetter(&self, index: u32) -> Option<DomRoot<StyleSheet>> {
        self.Item(index)
    }
}