/* 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 http://mozilla.org/MPL/2.0/. */

use dom::bindings::codegen::Bindings::MutationObserverBinding;
use dom::bindings::codegen::Bindings::MutationObserverBinding::MutationCallback;
use dom::bindings::error::Fallible;
use dom::bindings::js::Root;
use dom::bindings::reflector::{Reflector, reflect_dom_object};
use dom::window::Window;
use dom_struct::dom_struct;
use script_thread::ScriptThread;
use std::rc::Rc;

#[dom_struct]
pub struct MutationObserver {
    reflector_: Reflector,
    #[ignore_heap_size_of = "can't measure Rc values"]
    callback: Rc<MutationCallback>,
}

impl MutationObserver {
    fn new(global: &Window, callback: Rc<MutationCallback>) -> Root<MutationObserver> {
        let boxed_observer = box MutationObserver::new_inherited(callback);
        reflect_dom_object(boxed_observer, global, MutationObserverBinding::Wrap)
    }

    fn new_inherited(callback: Rc<MutationCallback>) -> MutationObserver {
        MutationObserver {
            reflector_: Reflector::new(),
            callback: callback,
        }
    }

    pub fn Constructor(global: &Window, callback: Rc<MutationCallback>) -> Fallible<Root<MutationObserver>> {
        let observer = MutationObserver::new(global, callback);
        ScriptThread::add_mutation_observer(&*observer);
        Ok(observer)
    }
}