/*
  toolmanager.cpp

  This file is part of GammaRay, the Qt application inspection and manipulation tool.

  SPDX-FileCopyrightText: 2013 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
  Author: Anton Kreuzkamp <anton.kreuzkamp@kdab.com>

  SPDX-License-Identifier: GPL-2.0-or-later

  Contact KDAB at <info@kdab.com> for commercial licensing options.
*/

#include "toolmanager.h"

#include "metaobject.h"
#include "metaobjectrepository.h"
#include "probe.h"
#include "probesettings.h"
#include "proxytoolfactory.h"
#include "toolfactory.h"

#include "tools/metatypebrowser/metatypebrowser.h"
#include "tools/objectinspector/objectinspector.h"
#include "tools/problemreporter/problemreporter.h"
#include "tools/resourcebrowser/resourcebrowser.h"
#include "tools/messagehandler/messagehandler.h"
#include "tools/metaobjectbrowser/metaobjectbrowser.h"

#include <QDebug>
#include <QCoreApplication>
#include <QMutexLocker>
#include <QThread>

#include <algorithm>

using namespace GammaRay;

ToolManager::ToolManager(QObject *parent)
    : ToolManagerInterface(parent)
    , m_toolPluginManager(new ToolPluginManager(this))
{
    // built-in tools
    addToolFactory(new ObjectInspectorFactory(this));
    addToolFactory(new ResourceBrowserFactory(this));
    addToolFactory(new MetaObjectBrowserFactory(this));
    addToolFactory(new MetaTypeBrowserFactory(this));
    addToolFactory(new MessageHandlerFactory(this));
    addToolFactory(new ProblemReporterFactory(this));

    Q_FOREACH (ToolFactory *factory, m_toolPluginManager->plugins())
        addToolFactory(factory);
}

void ToolManager::selectObject(const ObjectId &id, const QString &toolId)
{
    switch (id.type()) {
    case ObjectId::Invalid:
        return;
    case ObjectId::QObjectType: {
        QMutexLocker lock(Probe::objectLock());
        if (!Probe::instance()->isValidObject(id.asQObject()))
            return;

        Probe::instance()->selectObject(id.asQObject(), toolId);
        break;
    }
    case ObjectId::VoidStarType:
        Probe::instance()->selectObject(id.asVoidStar(), id.typeName());
        break;
    }
}

void ToolManager::selectTool(const QString &toolId)
{
    emit toolSelected(toolId);
}

void ToolManager::requestToolsForObject(const ObjectId &id)
{
    QVector<QString> toolInfos;
    switch (id.type()) {
    case ObjectId::Invalid:
        return;
    case ObjectId::QObjectType: {
        QMutexLocker lock(Probe::objectLock());
        if (!Probe::instance()->isValidObject(id.asQObject()))
            return;

        toolInfos = toolsForObject(id.asQObject());
        break;
    }
    case ObjectId::VoidStarType:
        const auto asVoidStar = reinterpret_cast<void *>(id.id());
        toolInfos = toolsForObject(asVoidStar, id.typeName());
        break;
    }
    emit toolsForObjectResponse(id, toolInfos);
}

void ToolManager::requestAvailableTools()
{
    QVector<ToolData> toolInfos;
    toolInfos.reserve(m_tools.size());
    for (ToolFactory *factory : std::as_const(m_tools))
        toolInfos.push_back(toolInfoForFactory(factory));
    emit availableToolsResponse(toolInfos);
}

ToolData ToolManager::toolInfoForFactory(ToolFactory *factory) const
{
    ToolData info;
    info.id = factory->id();
    info.hasUi = !factory->isHidden();
    info.enabled = !m_disabledTools.contains(factory);
    return info;
}

bool ToolManager::hasTool(const QString &id) const
{
    for (ToolFactory *factory : m_tools) {
        if (factory->id() == id)
            return true;
    }
    return false;
}

QVector<QString> ToolManager::toolsForObject(QObject *object) const
{
    if (!object)
        return QVector<QString>();

    QVector<QString> ret;
    QSet<ToolFactory *> knownTools;
    const QMetaObject *metaObject = object->metaObject();
    while (metaObject) {
        for (auto factory : m_tools) {
            if (factory && !factory->isHidden() && factory->selectableTypes().contains(metaObject->className()) && !knownTools.contains(factory)) {
                knownTools << factory;
                ret.append(factory->id());
            }
        }
        metaObject = metaObject->superClass();
    }
    return ret;
}

QVector<QString> ToolManager::toolsForObject(const void *object, const QString &typeName) const
{
    if (!object)
        return QVector<QString>();

    QVector<QString> ret;
    const MetaObject *metaObject = MetaObjectRepository::instance()->metaObject(typeName);
    while (metaObject) {
        for (auto factory : m_tools) {
            if (factory && !factory->isHidden()
                && factory->selectableTypes().contains(metaObject->className().toUtf8()))
                ret.append(factory->id());
        }
        metaObject = metaObject->superClass();
    }
    return ret;
}

void ToolManager::objectAdded(QObject *obj)
{
    // note: hot path, don't do expensive operations here

    Q_ASSERT(QThread::currentThread() == thread());
    Q_ASSERT(Probe::instance()->isValidObject(obj));

    // m_knownMetaObjects allows us to skip the expensive recursive search for matching tools
    if (!m_knownMetaObjects.contains(obj->metaObject())) {
        objectAdded(obj->metaObject());
        m_knownMetaObjects.insert(obj->metaObject());
    }
}

void ToolManager::objectAdded(const QMetaObject *mo)
{
    // note: hot path, don't do expensive operations here

    Q_ASSERT(thread() == QThread::currentThread());
    // as plugins can depend on each other, start from the base classes
    if (mo->superClass())
        objectAdded(mo->superClass());

    // operate on copy to ensure potential recursion isn't invalidating the iterators
    const auto disabledToolsCopy = m_disabledTools;
    for (auto *factory : disabledToolsCopy) {
        const auto begin = factory->supportedTypes().constBegin();
        const auto end = factory->supportedTypes().constEnd();
        if (std::find(begin, end, mo->className()) != end && m_disabledTools.remove(factory)) {
            factory->init(Probe::instance());
            emit toolEnabled(factory->id());
        }
    }
}

void ToolManager::addToolFactory(ToolFactory *tool)
{
    const auto excludedTools = ProbeSettings::value(QStringLiteral("DisabledPlugins"), QString()).toString();
    if (excludedTools.split(QLatin1Char(';')).contains(tool->id())) {
        return;
    }

    m_tools.push_back(tool);
    m_disabledTools.insert(tool);
}

ToolPluginManager *ToolManager::toolPluginManager() const
{
    return m_toolPluginManager.data();
}