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#include "symbolsfindfilter.h"

#include "cppmodelmanager.h"
#include "cpptoolsconstants.h"

#include <coreplugin/progressmanager/progressmanager.h>
#include <coreplugin/progressmanager/futureprogress.h>
#include <coreplugin/icore.h>
#include <find/textfindconstants.h>
#include <utils/runextensions.h>
#include <projectexplorer/projectexplorer.h>
#include <projectexplorer/session.h>
#include <projectexplorer/project.h>
#include <utils/qtcassert.h>

#include <QSet>
#include <QRegExp>
#include <QGridLayout>
#include <QLabel>
#include <QButtonGroup>

using namespace CppTools;
using namespace CppTools::Internal;

namespace {
    const char * const SETTINGS_GROUP = "CppSymbols";
    const char * const SETTINGS_SYMBOLTYPES = "SymbolsToSearchFor";
    const char * const SETTINGS_SEARCHSCOPE = "SearchScope";

    void runSearch(QFutureInterface<Find::SearchResultItem> &future,
              SymbolsFindParameters parameters, CPlusPlus::Snapshot snapshot,
              QSet<QString> fileNames)
    {
        future.setProgressRange(0, snapshot.size());
        future.setProgressValue(0);
        int progress = 0;

        SearchSymbols search;
        search.setSymbolsToSearchFor(parameters.types);
        search.setSeparateScope(true);
        CPlusPlus::Snapshot::const_iterator it = snapshot.begin();

        QString findString = (parameters.flags & Find::FindRegularExpression
                              ? parameters.text : QRegExp::escape(parameters.text));
        if (parameters.flags & Find::FindWholeWords)
            findString = QString::fromLatin1("\\b%1\\b").arg(findString);
        QRegExp matcher(findString, (parameters.flags & Find::FindCaseSensitively
                                     ? Qt::CaseSensitive : Qt::CaseInsensitive));
        while (it != snapshot.end()) {
            if (future.isPaused())
                future.waitForResume();
            if (future.isCanceled())
                break;
            if (fileNames.isEmpty() || fileNames.contains(it.value()->fileName())) {
                QVector<Find::SearchResultItem> resultItems;
                QList<ModelItemInfo> modelInfos = search(it.value());
                foreach (const ModelItemInfo &info, modelInfos) {
                    int index = matcher.indexIn(info.symbolName);
                    if (index != -1) {
                        QStringList path = info.fullyQualifiedName.mid(0,
                            info.fullyQualifiedName.size() - 1);
                        Find::SearchResultItem item;
                        item.path = path;
                        item.text = info.symbolName;
                        item.textMarkPos = -1;
                        item.textMarkLength = 0;
                        item.icon = info.icon;
                        item.lineNumber = -1;
                        item.userData = qVariantFromValue(info);
                        resultItems << item;
                    }
                }
                if (!resultItems.isEmpty())
                    future.reportResults(resultItems);
            }
            ++it;
            ++progress;
            future.setProgressValue(progress);
        }
        if (future.isPaused())
            future.waitForResume();
    }
} //namespace

SymbolsFindFilter::SymbolsFindFilter(CppModelManager *manager)
    : m_manager(manager),
      m_enabled(true),
      m_symbolsToSearch(SearchSymbols::AllTypes),
      m_scope(SearchProjectsOnly)
{
    // for disabling while parser is running
    connect(Core::ICore::progressManager(), SIGNAL(taskStarted(QString)),
            this, SLOT(onTaskStarted(QString)));
    connect(Core::ICore::progressManager(), SIGNAL(allTasksFinished(QString)),
            this, SLOT(onAllTasksFinished(QString)));
}

QString SymbolsFindFilter::id() const
{
    return QLatin1String("CppSymbols");
}

QString SymbolsFindFilter::displayName() const
{
    return tr("C++ Symbols");
}

bool SymbolsFindFilter::isEnabled() const
{
    return m_enabled;
}

void SymbolsFindFilter::cancel()
{
    Find::SearchResult *search = qobject_cast<Find::SearchResult *>(sender());
    QTC_ASSERT(search, return);
    QFutureWatcher<Find::SearchResultItem> *watcher = m_watchers.key(search);
    QTC_ASSERT(watcher, return);
    watcher->cancel();
}

void SymbolsFindFilter::setPaused(bool paused)
{
    Find::SearchResult *search = qobject_cast<Find::SearchResult *>(sender());
    QTC_ASSERT(search, return);
    QFutureWatcher<Find::SearchResultItem> *watcher = m_watchers.key(search);
    QTC_ASSERT(watcher, return);
    if (!paused || watcher->isRunning()) // guard against pausing when the search is finished
        watcher->setPaused(paused);
}

Find::FindFlags SymbolsFindFilter::supportedFindFlags() const
{
    return Find::FindCaseSensitively | Find::FindRegularExpression | Find::FindWholeWords;
}

void SymbolsFindFilter::findAll(const QString &txt, Find::FindFlags findFlags)
{
    Find::SearchResultWindow *window = Find::SearchResultWindow::instance();
    Find::SearchResult *search = window->startNewSearch(label(), toolTip(findFlags), txt);
    search->setSearchAgainSupported(true);
    connect(search, SIGNAL(activated(Find::SearchResultItem)),
            this, SLOT(openEditor(Find::SearchResultItem)));
    connect(search, SIGNAL(cancelled()), this, SLOT(cancel()));
    connect(search, SIGNAL(paused(bool)), this, SLOT(setPaused(bool)));
    connect(search, SIGNAL(searchAgainRequested()), this, SLOT(searchAgain()));
    connect(this, SIGNAL(enabledChanged(bool)), search, SLOT(setSearchAgainEnabled(bool)));
    window->popup(Core::IOutputPane::ModeSwitch | Core::IOutputPane::WithFocus);

    SymbolsFindParameters parameters;
    parameters.text = txt;
    parameters.flags = findFlags;
    parameters.types = m_symbolsToSearch;
    parameters.scope = m_scope;
    search->setUserData(qVariantFromValue(parameters));
    startSearch(search);
}

void SymbolsFindFilter::startSearch(Find::SearchResult *search)
{
    SymbolsFindParameters parameters = search->userData().value<SymbolsFindParameters>();
    QSet<QString> projectFileNames;
    if (parameters.scope == SymbolsFindFilter::SearchProjectsOnly) {
        foreach (ProjectExplorer::Project *project,
                 ProjectExplorer::ProjectExplorerPlugin::instance()->session()->projects()) {
            projectFileNames += project->files(ProjectExplorer::Project::AllFiles).toSet();
        }
    }

    QFutureWatcher<Find::SearchResultItem> *watcher = new QFutureWatcher<Find::SearchResultItem>();
    m_watchers.insert(watcher, search);
    connect(watcher, SIGNAL(finished()),
            this, SLOT(finish()));
    connect(watcher, SIGNAL(resultsReadyAt(int,int)),
            this, SLOT(addResults(int,int)));
    watcher->setFuture(QtConcurrent::run<Find::SearchResultItem, SymbolsFindParameters,
                       CPlusPlus::Snapshot, QSet<QString> >(runSearch, parameters,
                                                    m_manager->snapshot(), projectFileNames));
    Core::FutureProgress *progress = Core::ICore::progressManager()->addTask(watcher->future(),
                                                        tr("Searching"),
                                                        Find::Constants::TASK_SEARCH);
    connect(progress, SIGNAL(clicked()), search, SLOT(popup()));
}

void SymbolsFindFilter::addResults(int begin, int end)
{
    QFutureWatcher<Find::SearchResultItem> *watcher =
            static_cast<QFutureWatcher<Find::SearchResultItem> *>(sender());
    Find::SearchResult *search = m_watchers.value(watcher);
    if (!search) {
        // search was removed from search history while the search is running
        watcher->cancel();
        return;
    }
    QList<Find::SearchResultItem> items;
    for (int i = begin; i < end; ++i)
        items << watcher->resultAt(i);
    search->addResults(items, Find::SearchResult::AddSorted);
}

void SymbolsFindFilter::finish()
{
    QFutureWatcher<Find::SearchResultItem> *watcher =
            static_cast<QFutureWatcher<Find::SearchResultItem> *>(sender());
    Find::SearchResult *search = m_watchers.value(watcher);
    if (search)
        search->finishSearch(watcher->isCanceled());
    m_watchers.remove(watcher);
    watcher->deleteLater();
}

void SymbolsFindFilter::openEditor(const Find::SearchResultItem &item)
{
    if (!item.userData.canConvert<ModelItemInfo>())
        return;
    ModelItemInfo info = item.userData.value<ModelItemInfo>();
    TextEditor::BaseTextEditorWidget::openEditorAt(info.fileName,
                                             info.line,
                                             info.column);
}

QWidget *SymbolsFindFilter::createConfigWidget()
{
    return new SymbolsFindFilterConfigWidget(this);
}

void SymbolsFindFilter::writeSettings(QSettings *settings)
{
    settings->beginGroup(QLatin1String(SETTINGS_GROUP));
    settings->setValue(SETTINGS_SYMBOLTYPES, (int)m_symbolsToSearch);
    settings->setValue(SETTINGS_SEARCHSCOPE, (int)m_scope);
    settings->endGroup();
}

void SymbolsFindFilter::readSettings(QSettings *settings)
{
    settings->beginGroup(QLatin1String(SETTINGS_GROUP));
    m_symbolsToSearch = (SearchSymbols::SymbolTypes)settings->value(SETTINGS_SYMBOLTYPES,
                                        (int)SearchSymbols::AllTypes).toInt();
    m_scope = (SearchScope)settings->value(SETTINGS_SEARCHSCOPE,
                                           (int)SearchProjectsOnly).toInt();
    settings->endGroup();
    emit symbolsToSearchChanged();
}

void SymbolsFindFilter::onTaskStarted(const QString &type)
{
    if (type == CppTools::Constants::TASK_INDEX) {
        m_enabled = false;
        emit enabledChanged(m_enabled);
    }
}

void SymbolsFindFilter::onAllTasksFinished(const QString &type)
{
    if (type == CppTools::Constants::TASK_INDEX) {
        m_enabled = true;
        emit enabledChanged(m_enabled);
    }
}

void SymbolsFindFilter::searchAgain()
{
    Find::SearchResult *search = qobject_cast<Find::SearchResult *>(sender());
    QTC_ASSERT(search, return);
    search->restart();
    startSearch(search);
}

QString SymbolsFindFilter::label() const
{
    return tr("C++ Symbols:");
}

QString SymbolsFindFilter::toolTip(Find::FindFlags findFlags) const
{
    QStringList types;
    if (m_symbolsToSearch & SearchSymbols::Classes)
        types.append(tr("Classes"));
    if (m_symbolsToSearch & SearchSymbols::Functions)
        types.append(tr("Methods"));
    if (m_symbolsToSearch & SearchSymbols::Enums)
        types.append(tr("Enums"));
    if (m_symbolsToSearch & SearchSymbols::Declarations)
        types.append(tr("Declarations"));
    return tr("Scope: %1\nTypes: %2\nFlags: %3")
            .arg(searchScope() == SearchGlobal ? tr("All") : tr("Projects"))
            .arg(types.join(tr(", ")))
            .arg(Find::IFindFilter::descriptionForFindFlags(findFlags));
}

// #pragma mark -- SymbolsFindFilterConfigWidget

SymbolsFindFilterConfigWidget::SymbolsFindFilterConfigWidget(SymbolsFindFilter *filter)
    : m_filter(filter)
{
    connect(m_filter, SIGNAL(symbolsToSearchChanged()), this, SLOT(getState()));

    QGridLayout *layout = new QGridLayout(this);
    setLayout(layout);
    layout->setMargin(0);

    QLabel *typeLabel = new QLabel(tr("Types:"));
    layout->addWidget(typeLabel, 0, 0);

    m_typeClasses = new QCheckBox(tr("Classes"));
    layout->addWidget(m_typeClasses, 0, 1);

    m_typeMethods = new QCheckBox(tr("Methods"));
    layout->addWidget(m_typeMethods, 0, 2);

    m_typeEnums = new QCheckBox(tr("Enums"));
    layout->addWidget(m_typeEnums, 1, 1);

    m_typeDeclarations = new QCheckBox(tr("Declarations"));
    layout->addWidget(m_typeDeclarations, 1, 2);

    // hacks to fix layouting:
    typeLabel->setMinimumWidth(80);
    typeLabel->setAlignment(Qt::AlignRight);
    m_typeClasses->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
    m_typeMethods->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);

    connect(m_typeClasses, SIGNAL(clicked(bool)), this, SLOT(setState()));
    connect(m_typeMethods, SIGNAL(clicked(bool)), this, SLOT(setState()));
    connect(m_typeEnums, SIGNAL(clicked(bool)), this, SLOT(setState()));
    connect(m_typeDeclarations, SIGNAL(clicked(bool)), this, SLOT(setState()));

    m_searchProjectsOnly = new QRadioButton(tr("Projects only"));
    layout->addWidget(m_searchProjectsOnly, 2, 1);

    m_searchGlobal = new QRadioButton(tr("All files"));
    layout->addWidget(m_searchGlobal, 2, 2);

    m_searchGroup = new QButtonGroup(this);
    m_searchGroup->addButton(m_searchProjectsOnly);
    m_searchGroup->addButton(m_searchGlobal);

    connect(m_searchProjectsOnly, SIGNAL(clicked(bool)),
            this, SLOT(setState()));
    connect(m_searchGlobal, SIGNAL(clicked(bool)),
            this, SLOT(setState()));
}

void SymbolsFindFilterConfigWidget::getState()
{
    SearchSymbols::SymbolTypes symbols = m_filter->symbolsToSearch();
    m_typeClasses->setChecked(symbols & SearchSymbols::Classes);
    m_typeMethods->setChecked(symbols & SearchSymbols::Functions);
    m_typeEnums->setChecked(symbols & SearchSymbols::Enums);
    m_typeDeclarations->setChecked(symbols & SearchSymbols::Declarations);

    SymbolsFindFilter::SearchScope scope = m_filter->searchScope();
    m_searchProjectsOnly->setChecked(scope == SymbolsFindFilter::SearchProjectsOnly);
    m_searchGlobal->setChecked(scope == SymbolsFindFilter::SearchGlobal);
}

void SymbolsFindFilterConfigWidget::setState() const
{
    SearchSymbols::SymbolTypes symbols;
    if (m_typeClasses->isChecked())
        symbols |= SearchSymbols::Classes;
    if (m_typeMethods->isChecked())
        symbols |= SearchSymbols::Functions;
    if (m_typeEnums->isChecked())
        symbols |= SearchSymbols::Enums;
    if (m_typeDeclarations->isChecked())
        symbols |= SearchSymbols::Declarations;
    m_filter->setSymbolsToSearch(symbols);

    if (m_searchProjectsOnly->isChecked())
        m_filter->setSearchScope(SymbolsFindFilter::SearchProjectsOnly);
    else
        m_filter->setSearchScope(SymbolsFindFilter::SearchGlobal);
}