/*
 * Copyright (C) 2013 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER 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.
 */

#ifndef AsyncCallStackTracker_h
#define AsyncCallStackTracker_h

#include "bindings/v8/ScriptValue.h"
#include "wtf/Deque.h"
#include "wtf/HashMap.h"
#include "wtf/HashSet.h"
#include "wtf/Noncopyable.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"

namespace WebCore {

class ExecutionContext;

class AsyncCallStackTracker {
    WTF_MAKE_NONCOPYABLE(AsyncCallStackTracker);
public:
    class AsyncCallStack : public RefCounted<AsyncCallStack> {
    public:
        AsyncCallStack(const String&, const ScriptValue&);
        ~AsyncCallStack();
        String description() const { return m_description; }
        ScriptValue callFrames() const { return m_callFrames; }
    private:
        String m_description;
        ScriptValue m_callFrames;
    };

    typedef Deque<RefPtr<AsyncCallStack>, 4> AsyncCallStackVector;

    class AsyncCallChain : public RefCounted<AsyncCallChain> {
    public:
        AsyncCallChain() { }
        AsyncCallChain(const AsyncCallChain& t) : m_callStacks(t.m_callStacks) { }
        AsyncCallStackVector callStacks() const { return m_callStacks; }
    private:
        friend class AsyncCallStackTracker;
        AsyncCallStackVector m_callStacks;
    };

    AsyncCallStackTracker();

    bool isEnabled() const { return m_maxAsyncCallStackDepth; }
    void setAsyncCallStackDepth(int);
    const AsyncCallChain* currentAsyncCallChain() const;

    void didInstallTimer(ExecutionContext*, int timerId, bool singleShot, const ScriptValue& callFrames);
    void didRemoveTimer(ExecutionContext*, int timerId);
    void willFireTimer(ExecutionContext*, int timerId);

    void didRequestAnimationFrame(ExecutionContext*, int callbackId, const ScriptValue& callFrames);
    void didCancelAnimationFrame(ExecutionContext*, int callbackId);
    void willFireAnimationFrame(ExecutionContext*, int callbackId);

    void didFireAsyncCall();
    void clear();

private:
    PassRefPtr<AsyncCallChain> createAsyncCallChain(const String& description, const ScriptValue& callFrames);
    static void ensureMaxAsyncCallChainDepth(AsyncCallChain*, unsigned);
    static bool validateCallFrames(const ScriptValue& callFrames);

    class ExecutionContextData;
    void contextDestroyed(ExecutionContext*);
    ExecutionContextData* createContextDataIfNeeded(ExecutionContext*);

    unsigned m_maxAsyncCallStackDepth;
    RefPtr<AsyncCallChain> m_currentAsyncCallChain;
    HashMap<ExecutionContext*, ExecutionContextData*> m_executionContextDataMap;
};

} // namespace WebCore

#endif // !defined(AsyncCallStackTracker_h)