/*
 * Copyright (C) 2008-2017 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. ``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
 * 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. 
 */

#pragma once

#include "WorkerGlobalScopeProxy.h"
#include "WorkerLoaderProxy.h"
#include "WorkerObjectProxy.h"
#include <wtf/ThreadSafeRefCounted.h>

namespace WebCore {

class DedicatedWorkerThread;
class WorkerInspectorProxy;

class WorkerMessagingProxy final : public ThreadSafeRefCounted<WorkerMessagingProxy>, public WorkerGlobalScopeProxy, public WorkerObjectProxy, public WorkerLoaderProxy {
    WTF_MAKE_FAST_ALLOCATED;
public:
    explicit WorkerMessagingProxy(Worker&);
    virtual ~WorkerMessagingProxy();

private:
    // Implementations of WorkerGlobalScopeProxy.
    // (Only use these functions in the worker object thread.)
    void startWorkerGlobalScope(const URL& scriptURL, const String& userAgent, const String& sourceCode, const ContentSecurityPolicyResponseHeaders&, bool shouldBypassMainWorldContentSecurityPolicy, MonotonicTime timeOrigin, JSC::RuntimeFlags) final;
    void terminateWorkerGlobalScope() final;
    void postMessageToWorkerGlobalScope(RefPtr<SerializedScriptValue>&&, std::unique_ptr<MessagePortChannelArray>) final;
    bool hasPendingActivity() const final;
    void workerObjectDestroyed() final;
    void notifyNetworkStateChange(bool isOnline) final;

    // Implementations of WorkerObjectProxy.
    // (Only use these functions in the worker context thread.)
    void postMessageToWorkerObject(RefPtr<SerializedScriptValue>&&, std::unique_ptr<MessagePortChannelArray>) final;
    void postExceptionToWorkerObject(const String& errorMessage, int lineNumber, int columnNumber, const String& sourceURL) final;
    void postMessageToPageInspector(const String&) final;
    void confirmMessageFromWorkerObject(bool hasPendingActivity) final;
    void reportPendingActivity(bool hasPendingActivity) final;
    void workerGlobalScopeClosed() final;
    void workerGlobalScopeDestroyed() final;

    // Implementation of WorkerLoaderProxy.
    // These functions are called on different threads to schedule loading
    // requests and to send callbacks back to WorkerGlobalScope.
    void postTaskToLoader(ScriptExecutionContext::Task&&) final;
    bool postTaskForModeToWorkerGlobalScope(ScriptExecutionContext::Task&&, const String& mode) final;

    void workerThreadCreated(DedicatedWorkerThread&);

    // Only use this method on the worker object thread.
    bool askedToTerminate() const { return m_askedToTerminate; }

    void workerGlobalScopeDestroyedInternal();
    void reportPendingActivityInternal(bool confirmingMessage, bool hasPendingActivity);
    Worker* workerObject() const { return m_workerObject; }

    RefPtr<ScriptExecutionContext> m_scriptExecutionContext;
    std::unique_ptr<WorkerInspectorProxy> m_inspectorProxy;
    Worker* m_workerObject;
    bool m_mayBeDestroyed { false };
    RefPtr<DedicatedWorkerThread> m_workerThread;

    unsigned m_unconfirmedMessageCount { 0 }; // Unconfirmed messages from worker object to worker thread.
    bool m_workerThreadHadPendingActivity { false }; // The latest confirmation from worker thread reported that it was still active.

    bool m_askedToTerminate { false };

    Vector<std::unique_ptr<ScriptExecutionContext::Task>> m_queuedEarlyTasks; // Tasks are queued here until there's a thread object created.
};

} // namespace WebCore
