#import <CSS/FontFace.idl>
#import <DOM/EventTarget.idl>

dictionary FontFaceSetLoadEventInit : EventInit {
    sequence<FontFace> fontfaces = [];
};

// FIXME
// [Exposed=(Window,Worker)]
//interface FontFaceSetLoadEvent : Event {
//    constructor(CSSOMString type, optional FontFaceSetLoadEventInit eventInitDict = {});
//    [SameObject] readonly attribute FrozenArray<FontFace> fontfaces;
//};

enum FontFaceSetLoadStatus { "loading", "loaded" };

// https://drafts.csswg.org/css-font-loading/#fontfaceset
[Exposed=(Window,Worker)]
interface FontFaceSet : EventTarget {
    constructor(sequence<FontFace> initialFaces);

    setlike<FontFace>;
    FontFaceSet add(FontFace font);
    boolean delete(FontFace font);
    undefined clear();

    // events for when loading state changes
    attribute EventHandler onloading;
    attribute EventHandler onloadingdone;
    attribute EventHandler onloadingerror;

    // check and start loads if appropriate
    // and fulfill promise when all loads complete
    // FIXME: Promise<sequence<FontFace>> load(CSSOMString font, optional CSSOMString text = " ");
    Promise<sequence<FontFace>> load(CSSOMString font, optional CSSOMString text = "");

    // return whether all fonts in the fontlist are loaded
    // (does not initiate load if not available)
    // FIXME: boolean check(CSSOMString font, optional CSSOMString text = " ");
    [FIXME] boolean check(CSSOMString font, optional CSSOMString text = "");

    // async notification that font loading and layout operations are done
    readonly attribute Promise<FontFaceSet> ready;

    // loading state, "loading" while one or more fonts loading, "loaded" otherwise
    readonly attribute FontFaceSetLoadStatus status;
};

interface mixin FontFaceSource {
    readonly attribute FontFaceSet fonts;
};