/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "ExtendableEvent.h"

#include "EventLoop.h"
#include "ExceptionOr.h"
#include "JSDOMGlobalObject.h"
#include "JSDOMPromise.h"
#include "ScriptExecutionContextInlines.h"
#include <JavaScriptCore/Microtask.h>
#include <wtf/TZoneMallocInlines.h>

namespace WebCore {

WTF_MAKE_TZONE_ALLOCATED_IMPL(ExtendableEvent);

ExtendableEvent::ExtendableEvent(enum EventInterfaceType eventInterface, const AtomString& type, const ExtendableEventInit& initializer, IsTrusted isTrusted)
    : Event(eventInterface, type, initializer, isTrusted)
{
}

ExtendableEvent::ExtendableEvent(enum EventInterfaceType eventInterface, const AtomString& type, CanBubble canBubble, IsCancelable cancelable)
    : Event(eventInterface, type, canBubble, cancelable)
{
}

ExtendableEvent::~ExtendableEvent() = default;

// https://w3c.github.io/ServiceWorker/#dom-extendableevent-waituntil
ExceptionOr<void> ExtendableEvent::waitUntil(Ref<DOMPromise>&& promise)
{
    if (!isTrusted())
        return Exception { ExceptionCode::InvalidStateError, "Event is not trusted"_s };

    // If the pending promises count is zero and the dispatch flag is unset, throw an "InvalidStateError" DOMException.
    if (!m_pendingPromiseCount && !isBeingDispatched())
        return Exception { ExceptionCode::InvalidStateError, "Event is no longer being dispatched and has no pending promises"_s };

    addExtendLifetimePromise(WTF::move(promise));
    return { };
}

void ExtendableEvent::addExtendLifetimePromise(Ref<DOMPromise>&& promise)
{
    promise->whenSettledWithResult([this, protectedThis = Ref { *this }](auto* globalObject, auto, auto) mutable {
        RefPtr context = globalObject ? globalObject->scriptExecutionContext() : nullptr;
        if (!context)
            return;
        protect(context->eventLoop())->queueMicrotask(context->vm(), [this, protectedThis = WTF::move(protectedThis), weakContext = WeakPtr { *context }]() mutable {
            --m_pendingPromiseCount;

            // FIXME: Let registration be the context object's relevant global object's associated service worker's containing service worker registration.
            // FIXME: If registration's uninstalling flag is set, invoke Try Clear Registration with registration.
            // FIXME: If registration is not null, invoke Try Activate with registration.

            RefPtr context = weakContext.get();
            if (!context)
                return;
            context->postTask([this, protectedThis = WTF::move(protectedThis)] (ScriptExecutionContext&) mutable {
                if (m_pendingPromiseCount)
                    return;

                m_isWaiting = false;
                auto settledPromises = WTF::move(m_extendLifetimePromises);
                if (auto handler = WTF::move(m_whenAllExtendLifetimePromisesAreSettledHandler))
                    handler(WTF::move(settledPromises));
            });
        });
    });

    m_extendLifetimePromises.add(WTF::move(promise));
    ++m_pendingPromiseCount;
}

void ExtendableEvent::whenAllExtendLifetimePromisesAreSettled(Function<void(HashSet<Ref<DOMPromise>>&&)>&& handler)
{
    ASSERT_WITH_MESSAGE(target(), "Event has not been dispatched yet");
    ASSERT(!m_whenAllExtendLifetimePromisesAreSettledHandler);

    if (!m_pendingPromiseCount) {
        m_isWaiting = false;
        handler(WTF::move(m_extendLifetimePromises));
        return;
    }

    m_whenAllExtendLifetimePromisesAreSettledHandler = WTF::move(handler);
}

} // namespace WebCore
