/*
 * Copyright (C) 2012 Intel 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.
 */

#include "config.h"
#include "PerformanceUserTiming.h"

#if ENABLE(WEB_TIMING)

#include "Document.h"
#include "ExceptionCode.h"
#include "Performance.h"
#include "PerformanceTiming.h"
#include <array>
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/dtoa/utils.h>

namespace WebCore {

namespace {

typedef unsigned long long (PerformanceTiming::*NavigationTimingFunction)() const;

static NavigationTimingFunction restrictedMarkFunction(const String& markName)
{
    ASSERT(isMainThread());

    using MapPair = std::pair<ASCIILiteral, NavigationTimingFunction>;
    static const std::array<MapPair, 21> pairs = { {
        MapPair { ASCIILiteral("navigationStart"), &PerformanceTiming::navigationStart },
        MapPair { ASCIILiteral("unloadEventStart"), &PerformanceTiming::unloadEventStart },
        MapPair { ASCIILiteral("unloadEventEnd"), &PerformanceTiming::unloadEventEnd },
        MapPair { ASCIILiteral("redirectStart"), &PerformanceTiming::redirectStart },
        MapPair { ASCIILiteral("redirectEnd"), &PerformanceTiming::redirectEnd },
        MapPair { ASCIILiteral("fetchStart"), &PerformanceTiming::fetchStart },
        MapPair { ASCIILiteral("domainLookupStart"), &PerformanceTiming::domainLookupStart },
        MapPair { ASCIILiteral("domainLookupEnd"), &PerformanceTiming::domainLookupEnd },
        MapPair { ASCIILiteral("connectStart"), &PerformanceTiming::connectStart },
        MapPair { ASCIILiteral("connectEnd"), &PerformanceTiming::connectEnd },
        MapPair { ASCIILiteral("secureConnectionStart"), &PerformanceTiming::secureConnectionStart },
        MapPair { ASCIILiteral("requestStart"), &PerformanceTiming::requestStart },
        MapPair { ASCIILiteral("responseStart"), &PerformanceTiming::responseStart },
        MapPair { ASCIILiteral("responseEnd"), &PerformanceTiming::responseEnd },
        MapPair { ASCIILiteral("domLoading"), &PerformanceTiming::domLoading },
        MapPair { ASCIILiteral("domInteractive"), &PerformanceTiming::domInteractive },
        MapPair { ASCIILiteral("domContentLoadedEventStart"), &PerformanceTiming::domContentLoadedEventStart },
        MapPair { ASCIILiteral("domContentLoadedEventEnd"), &PerformanceTiming::domContentLoadedEventEnd },
        MapPair { ASCIILiteral("domComplete"), &PerformanceTiming::domComplete },
        MapPair { ASCIILiteral("loadEventStart"), &PerformanceTiming::loadEventStart },
        MapPair { ASCIILiteral("loadEventEnd"), &PerformanceTiming::loadEventEnd },
    } };

    static NeverDestroyed<HashMap<String, NavigationTimingFunction>> map;
    if (map.get().isEmpty()) {
        for (auto& pair : pairs)
            map.get().add(pair.first, pair.second);
    }

    return map.get().get(markName);
}

} // namespace anonymous

UserTiming::UserTiming(Performance& performance)
    : m_performance(performance)
{
}

static void clearPerformanceEntries(PerformanceEntryMap& performanceEntryMap, const String& name)
{
    if (name.isNull()) {
        performanceEntryMap.clear();
        return;
    }

    performanceEntryMap.remove(name);
}

ExceptionOr<Ref<PerformanceMark>> UserTiming::mark(const String& markName)
{
    if (is<Document>(m_performance.scriptExecutionContext())) {
        if (restrictedMarkFunction(markName))
            return Exception { SYNTAX_ERR };
    }

    auto& performanceEntryList = m_marksMap.ensure(markName, [] { return Vector<RefPtr<PerformanceEntry>>(); }).iterator->value;
    auto entry = PerformanceMark::create(markName, m_performance.now());
    performanceEntryList.append(entry.copyRef());
    return WTFMove(entry);
}

void UserTiming::clearMarks(const String& markName)
{
    clearPerformanceEntries(m_marksMap, markName);
}

ExceptionOr<double> UserTiming::findExistingMarkStartTime(const String& markName)
{
    if (m_marksMap.contains(markName))
        return m_marksMap.get(markName).last()->startTime();

    PerformanceTiming* timing = m_performance.timing();
    if (!timing)
        return Exception { SYNTAX_ERR, makeString("No mark named '", markName, "' exists") };

    if (auto function = restrictedMarkFunction(markName)) {
        double value = static_cast<double>(((*timing).*(function))());
        if (!value)
            return Exception { INVALID_ACCESS_ERR };
        return value - timing->navigationStart();
    }

    return Exception { SYNTAX_ERR };
}

ExceptionOr<Ref<PerformanceMeasure>> UserTiming::measure(const String& measureName, const String& startMark, const String& endMark)
{
    double startTime = 0.0;
    double endTime = 0.0;

    if (startMark.isNull())
        endTime = m_performance.now();
    else if (endMark.isNull()) {
        endTime = m_performance.now();
        auto startMarkResult = findExistingMarkStartTime(startMark);
        if (startMarkResult.hasException())
            return startMarkResult.releaseException();
        startTime = startMarkResult.releaseReturnValue();
    } else {
        auto endMarkResult = findExistingMarkStartTime(endMark);
        if (endMarkResult.hasException())
            return endMarkResult.releaseException();
        auto startMarkResult = findExistingMarkStartTime(startMark);
        if (startMarkResult.hasException())
            return startMarkResult.releaseException();
        startTime = startMarkResult.releaseReturnValue();
        endTime = endMarkResult.releaseReturnValue();
    }

    auto& performanceEntryList = m_measuresMap.ensure(measureName, [] { return Vector<RefPtr<PerformanceEntry>>(); }).iterator->value;
    auto entry = PerformanceMeasure::create(measureName, startTime, endTime);
    performanceEntryList.append(entry.copyRef());
    return WTFMove(entry);
}

void UserTiming::clearMeasures(const String& measureName)
{
    clearPerformanceEntries(m_measuresMap, measureName);
}

static Vector<RefPtr<PerformanceEntry>> convertToEntrySequence(const PerformanceEntryMap& performanceEntryMap)
{
    Vector<RefPtr<PerformanceEntry>> entries;
    for (auto& entry : performanceEntryMap.values())
        entries.appendVector(entry);
    return entries;
}

static Vector<RefPtr<PerformanceEntry>> getEntrySequenceByName(const PerformanceEntryMap& performanceEntryMap, const String& name)
{
    return performanceEntryMap.get(name);
}

Vector<RefPtr<PerformanceEntry>> UserTiming::getMarks() const
{
    return convertToEntrySequence(m_marksMap);
}

Vector<RefPtr<PerformanceEntry>> UserTiming::getMarks(const String& name) const
{
    return getEntrySequenceByName(m_marksMap, name);
}

Vector<RefPtr<PerformanceEntry>> UserTiming::getMeasures() const
{
    return convertToEntrySequence(m_measuresMap);
}

Vector<RefPtr<PerformanceEntry>> UserTiming::getMeasures(const String& name) const
{
    return getEntrySequenceByName(m_measuresMap, name);
}

} // namespace WebCore

#endif // ENABLE(WEB_TIMING)