/*
 * Copyright (C) 2010 Apple Inc. All rights reserved.
 * Copyright (C) 2010 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:
 *
 * 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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE 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 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 "InspectorProfilerAgent.h"

#if ENABLE(JAVASCRIPT_DEBUGGER) && ENABLE(INSPECTOR)

#include "Console.h"
#include "InspectorConsoleAgent.h"
#include "InspectorFrontend.h"
#include "InspectorState.h"
#include "InspectorValues.h"
#include "InstrumentingAgents.h"
#include "KURL.h"
#include "Page.h"
#include "PageScriptDebugServer.h"
#include "ScriptHeapSnapshot.h"
#include "ScriptProfile.h"
#include "ScriptProfiler.h"
#include <wtf/OwnPtr.h>
#include <wtf/text/StringConcatenate.h>

#if USE(JSC)
#include "JSDOMWindow.h"
#endif

namespace WebCore {

namespace ProfilerAgentState {
static const char userInitiatedProfiling[] = "userInitiatedProfiling";
static const char profilerEnabled[] = "profilerEnabled";
}

static const char* const UserInitiatedProfileName = "org.webkit.profiles.user-initiated";
static const char* const CPUProfileType = "CPU";
static const char* const HeapProfileType = "HEAP";

PassOwnPtr<InspectorProfilerAgent> InspectorProfilerAgent::create(InstrumentingAgents* instrumentingAgents, InspectorConsoleAgent* consoleAgent, Page* inspectedPage, InspectorState* inspectorState)
{
    return adoptPtr(new InspectorProfilerAgent(instrumentingAgents, consoleAgent, inspectedPage, inspectorState));
}

InspectorProfilerAgent::InspectorProfilerAgent(InstrumentingAgents* instrumentingAgents, InspectorConsoleAgent* consoleAgent, Page* inspectedPage, InspectorState* inspectorState)
    : m_instrumentingAgents(instrumentingAgents)
    , m_consoleAgent(consoleAgent)
    , m_inspectedPage(inspectedPage)
    , m_inspectorState(inspectorState)
    , m_frontend(0)
    , m_enabled(false)
    , m_recordingUserInitiatedProfile(false)
    , m_currentUserInitiatedProfileNumber(-1)
    , m_nextUserInitiatedProfileNumber(1)
    , m_nextUserInitiatedHeapSnapshotNumber(1)
{
    m_instrumentingAgents->setInspectorProfilerAgent(this);
}

InspectorProfilerAgent::~InspectorProfilerAgent()
{
    m_instrumentingAgents->setInspectorProfilerAgent(0);
}

void InspectorProfilerAgent::addProfile(PassRefPtr<ScriptProfile> prpProfile, unsigned lineNumber, const String& sourceURL)
{
    RefPtr<ScriptProfile> profile = prpProfile;
    m_profiles.add(profile->uid(), profile);
    if (m_frontend)
        m_frontend->addProfileHeader(createProfileHeader(*profile));
    addProfileFinishedMessageToConsole(profile, lineNumber, sourceURL);
}

void InspectorProfilerAgent::addProfileFinishedMessageToConsole(PassRefPtr<ScriptProfile> prpProfile, unsigned lineNumber, const String& sourceURL)
{
    if (!m_frontend)
        return;
    RefPtr<ScriptProfile> profile = prpProfile;
    String title = profile->title();
    String message = makeString("Profile \"webkit-profile://", CPUProfileType, '/', encodeWithURLEscapeSequences(title), '#', String::number(profile->uid()), "\" finished.");
    m_consoleAgent->addMessageToConsole(JSMessageSource, LogMessageType, LogMessageLevel, message, lineNumber, sourceURL);
}

void InspectorProfilerAgent::addStartProfilingMessageToConsole(const String& title, unsigned lineNumber, const String& sourceURL)
{
    if (!m_frontend)
        return;
    String message = makeString("Profile \"webkit-profile://", CPUProfileType, '/', encodeWithURLEscapeSequences(title), "#0\" started.");
    m_consoleAgent->addMessageToConsole(JSMessageSource, LogMessageType, LogMessageLevel, message, lineNumber, sourceURL);
}

void InspectorProfilerAgent::collectGarbage(WebCore::ErrorString*)
{
    ScriptProfiler::collectGarbage();
}

PassRefPtr<InspectorObject> InspectorProfilerAgent::createProfileHeader(const ScriptProfile& profile)
{
    RefPtr<InspectorObject> header = InspectorObject::create();
    header->setString("title", profile.title());
    header->setNumber("uid", profile.uid());
    header->setString("typeId", String(CPUProfileType));
    return header;
}

PassRefPtr<InspectorObject> InspectorProfilerAgent::createSnapshotHeader(const ScriptHeapSnapshot& snapshot)
{
    RefPtr<InspectorObject> header = InspectorObject::create();
    header->setString("title", snapshot.title());
    header->setNumber("uid", snapshot.uid());
    header->setString("typeId", String(HeapProfileType));
    return header;
}

void InspectorProfilerAgent::enable(ErrorString*)
{
    if (enabled())
        return;
    m_inspectorState->setBoolean(ProfilerAgentState::profilerEnabled, true);
    enable(false);
}

void InspectorProfilerAgent::disable(ErrorString*)
{
    m_inspectorState->setBoolean(ProfilerAgentState::profilerEnabled, false);
    disable();
}

void InspectorProfilerAgent::disable()
{
    if (!m_enabled)
        return;
    m_enabled = false;
    PageScriptDebugServer::shared().recompileAllJSFunctionsSoon();
    if (m_frontend)
        m_frontend->profilerWasDisabled();
}

void InspectorProfilerAgent::enable(bool skipRecompile)
{
    if (m_enabled)
        return;
    m_enabled = true;
    if (!skipRecompile)
        PageScriptDebugServer::shared().recompileAllJSFunctionsSoon();
    if (m_frontend)
        m_frontend->profilerWasEnabled();
}

String InspectorProfilerAgent::getCurrentUserInitiatedProfileName(bool incrementProfileNumber)
{
    if (incrementProfileNumber)
        m_currentUserInitiatedProfileNumber = m_nextUserInitiatedProfileNumber++;

    return makeString(UserInitiatedProfileName, '.', String::number(m_currentUserInitiatedProfileNumber));
}

void InspectorProfilerAgent::getProfileHeaders(ErrorString*, RefPtr<InspectorArray>* headers)
{
    ProfilesMap::iterator profilesEnd = m_profiles.end();
    for (ProfilesMap::iterator it = m_profiles.begin(); it != profilesEnd; ++it)
        (*headers)->pushObject(createProfileHeader(*it->second));
    HeapSnapshotsMap::iterator snapshotsEnd = m_snapshots.end();
    for (HeapSnapshotsMap::iterator it = m_snapshots.begin(); it != snapshotsEnd; ++it)
        (*headers)->pushObject(createSnapshotHeader(*it->second));
}

namespace {

class OutputStream : public ScriptHeapSnapshot::OutputStream {
public:
    OutputStream(InspectorFrontend::Profiler* frontend, unsigned uid)
        : m_frontend(frontend), m_uid(uid) { }
    void Write(const String& chunk) { m_frontend->addHeapSnapshotChunk(m_uid, chunk); }
    void Close() { m_frontend->finishHeapSnapshot(m_uid); }
private:
    InspectorFrontend::Profiler* m_frontend;
    int m_uid;
};

} // namespace

void InspectorProfilerAgent::getProfile(ErrorString*, const String& type, unsigned uid, RefPtr<InspectorObject>* profileObject)
{
    if (type == CPUProfileType) {
        ProfilesMap::iterator it = m_profiles.find(uid);
        if (it != m_profiles.end()) {
            *profileObject = createProfileHeader(*it->second);
            (*profileObject)->setObject("head", it->second->buildInspectorObjectForHead());
        }
    } else if (type == HeapProfileType) {
        HeapSnapshotsMap::iterator it = m_snapshots.find(uid);
        if (it != m_snapshots.end()) {
            RefPtr<ScriptHeapSnapshot> snapshot = it->second;
            *profileObject = createSnapshotHeader(*snapshot);
            if (m_frontend) {
                OutputStream stream(m_frontend, uid);
                snapshot->writeJSON(&stream);
            }
        }
    }
}

void InspectorProfilerAgent::removeProfile(ErrorString*, const String& type, unsigned uid)
{
    if (type == CPUProfileType) {
        if (m_profiles.contains(uid))
            m_profiles.remove(uid);
    } else if (type == HeapProfileType) {
        if (m_snapshots.contains(uid))
            m_snapshots.remove(uid);
    }
}

void InspectorProfilerAgent::resetState()
{
    stopUserInitiatedProfiling();
    m_profiles.clear();
    m_snapshots.clear();
    m_currentUserInitiatedProfileNumber = 1;
    m_nextUserInitiatedProfileNumber = 1;
    m_nextUserInitiatedHeapSnapshotNumber = 1;
    resetFrontendProfiles();
}

void InspectorProfilerAgent::resetFrontendProfiles()
{
    if (m_frontend
        && m_profiles.begin() == m_profiles.end()
        && m_snapshots.begin() == m_snapshots.end())
        m_frontend->resetProfiles();
}

void InspectorProfilerAgent::setFrontend(InspectorFrontend* frontend)
{
    m_frontend = frontend->profiler();
    restoreEnablement();
}

void InspectorProfilerAgent::clearFrontend()
{
    m_frontend = 0;
    stopUserInitiatedProfiling();
}

void InspectorProfilerAgent::restore()
{
    // Need to restore enablement state here as in setFrontend m_inspectorState wasn't loaded yet.
    restoreEnablement();

    // Revisit this.
    resetFrontendProfiles();
    if (m_inspectorState->getBoolean(ProfilerAgentState::userInitiatedProfiling))
        startUserInitiatedProfiling();
}

void InspectorProfilerAgent::restoreEnablement()
{
    if (m_inspectorState->getBoolean(ProfilerAgentState::profilerEnabled)) {
        ErrorString error;
        enable(&error);
    }
}

void InspectorProfilerAgent::startUserInitiatedProfiling()
{
    if (m_recordingUserInitiatedProfile)
        return;
    if (!enabled()) {
        enable(true);
        PageScriptDebugServer::shared().recompileAllJSFunctions(0);
    }
    m_recordingUserInitiatedProfile = true;
    String title = getCurrentUserInitiatedProfileName(true);
#if USE(JSC)
    JSC::ExecState* scriptState = toJSDOMWindow(m_inspectedPage->mainFrame(), debuggerWorld())->globalExec();
#else
    ScriptState* scriptState = 0;
#endif
    ScriptProfiler::start(scriptState, title);
    addStartProfilingMessageToConsole(title, 0, String());
    toggleRecordButton(true);
    m_inspectorState->setBoolean(ProfilerAgentState::userInitiatedProfiling, true);
}

void InspectorProfilerAgent::stopUserInitiatedProfiling(bool ignoreProfile)
{
    if (!m_recordingUserInitiatedProfile)
        return;
    m_recordingUserInitiatedProfile = false;
    String title = getCurrentUserInitiatedProfileName();
#if USE(JSC)
    JSC::ExecState* scriptState = toJSDOMWindow(m_inspectedPage->mainFrame(), debuggerWorld())->globalExec();
#else
    // Use null script state to avoid filtering by context security token.
    // All functions from all iframes should be visible from Inspector UI.
    ScriptState* scriptState = 0;
#endif
    RefPtr<ScriptProfile> profile = ScriptProfiler::stop(scriptState, title);
    if (profile) {
        if (!ignoreProfile)
            addProfile(profile, 0, String());
        else
            addProfileFinishedMessageToConsole(profile, 0, String());
    }
    toggleRecordButton(false);
    m_inspectorState->setBoolean(ProfilerAgentState::userInitiatedProfiling, false);
}

namespace {

class HeapSnapshotProgress: public ScriptProfiler::HeapSnapshotProgress {
public:
    explicit HeapSnapshotProgress(InspectorFrontend::Profiler* frontend)
        : m_frontend(frontend) { }
    void Start(int totalWork)
    {
        m_totalWork = totalWork;
    }
    void Worked(int workDone)
    {
        if (m_frontend)
            m_frontend->reportHeapSnapshotProgress(workDone, m_totalWork);
    }
    void Done() { }
    bool isCanceled() { return false; }
private:
    InspectorFrontend::Profiler* m_frontend;
    int m_totalWork;
};

};

void InspectorProfilerAgent::takeHeapSnapshot(ErrorString*, bool detailed)
{
    String title = makeString(UserInitiatedProfileName, '.', String::number(m_nextUserInitiatedHeapSnapshotNumber));
    ++m_nextUserInitiatedHeapSnapshotNumber;

    HeapSnapshotProgress progress(m_frontend);
    RefPtr<ScriptHeapSnapshot> snapshot = ScriptProfiler::takeHeapSnapshot(title, detailed ? &progress : 0);
    if (snapshot) {
        m_snapshots.add(snapshot->uid(), snapshot);
        if (m_frontend)
            m_frontend->addProfileHeader(createSnapshotHeader(*snapshot));
    }
}

void InspectorProfilerAgent::toggleRecordButton(bool isProfiling)
{
    if (m_frontend)
        m_frontend->setRecordingProfile(isProfiling);
}

} // namespace WebCore

#endif // ENABLE(JAVASCRIPT_DEBUGGER) && ENABLE(INSPECTOR)