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/**************************************************************************
**
** This file is part of Qt Creator
**
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** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
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**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you are unsure which license is appropriate for your use, please
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** contact the sales department at http://qt.nokia.com/contact.
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**
**************************************************************************/

#include "cppfindreferences.h"
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#include "cppmodelmanagerinterface.h"
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#include "cpptoolsconstants.h"

#include <texteditor/basetexteditor.h>
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#include <texteditor/basefilefind.h>
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#include <find/searchresultwindow.h>
#include <extensionsystem/pluginmanager.h>
#include <utils/filesearch.h>
#include <coreplugin/progressmanager/progressmanager.h>
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#include <coreplugin/progressmanager/futureprogress.h>
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#include <coreplugin/editormanager/editormanager.h>
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#include <coreplugin/icore.h>

#include <ASTVisitor.h>
#include <AST.h>
#include <Control.h>
#include <Literals.h>
#include <TranslationUnit.h>
#include <Symbols.h>
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#include <Names.h>
#include <Scope.h>
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#include <cplusplus/CppDocument.h>
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#include <cplusplus/Overview.h>
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#include <QtCore/QTime>
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#include <QtCore/QTimer>
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#include <QtCore/QtConcurrentRun>
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#include <QtCore/QtConcurrentMap>
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#include <QtCore/QDir>
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#include <QtGui/QApplication>
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#include <qtconcurrent/runextensions.h>

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#include <functional>

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using namespace CppTools::Internal;
using namespace CPlusPlus;

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static QString getSource(const QString &fileName,
                         const CppTools::CppModelManagerInterface::WorkingCopy &workingCopy)
{
    if (workingCopy.contains(fileName)) {
        return workingCopy.source(fileName);
    } else {
        QFile file(fileName);
        if (! file.open(QFile::ReadOnly))
            return QString();

        return QTextStream(&file).readAll(); // ### FIXME
    }
}

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namespace {
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class ProcessFile: public std::unary_function<QString, QList<Usage> >
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{
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    const CppTools::CppModelManagerInterface::WorkingCopy workingCopy;
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    const Snapshot snapshot;
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    Document::Ptr symbolDocument;
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    Symbol *symbol;

public:
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    ProcessFile(const CppTools::CppModelManagerInterface::WorkingCopy &workingCopy,
                const Snapshot snapshot,
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                Document::Ptr symbolDocument,
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                Symbol *symbol)
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        : workingCopy(workingCopy), snapshot(snapshot), symbolDocument(symbolDocument), symbol(symbol)
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    { }

    QList<Usage> operator()(const QString &fileName)
    {
        QList<Usage> usages;
        const Identifier *symbolId = symbol->identifier();

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        if (Document::Ptr previousDoc = snapshot.document(fileName)) {
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            Control *control = previousDoc->control();
            if (! control->findIdentifier(symbolId->chars(), symbolId->size()))
                return usages; // skip this document, it's not using symbolId.
        }

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        QByteArray source = snapshot.preprocessedCode(
                getSource(fileName, workingCopy), fileName);
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        Document::Ptr doc = snapshot.documentFromSource(source, fileName);
        doc->tokenize();

        Control *control = doc->control();
        if (control->findIdentifier(symbolId->chars(), symbolId->size()) != 0) {
            doc->check();

            FindUsages process(doc, snapshot);
            process(symbol);
            usages = process.usages();
        }

        return usages;
    }
};

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class UpdateUI: public std::binary_function<QList<Usage> &, QList<Usage>, void>
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{
    QFutureInterface<Usage> *future;

public:
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    UpdateUI(QFutureInterface<Usage> *future): future(future) {}
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    void operator()(QList<Usage> &, const QList<Usage> &usages)
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    {
        foreach (const Usage &u, usages)
            future->reportResult(u);

        future->setProgressValue(future->progressValue() + 1);
    }
};

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} // end of anonymous namespace

CppFindReferences::CppFindReferences(CppTools::CppModelManagerInterface *modelManager)
    : QObject(modelManager),
      _modelManager(modelManager),
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      _resultWindow(Find::SearchResultWindow::instance())
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{
    m_watcher.setPendingResultsLimit(1);
    connect(&m_watcher, SIGNAL(resultsReadyAt(int,int)), this, SLOT(displayResults(int,int)));
    connect(&m_watcher, SIGNAL(finished()), this, SLOT(searchFinished()));
}

CppFindReferences::~CppFindReferences()
{
}

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QList<int> CppFindReferences::references(Symbol *symbol, const LookupContext &context) const
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{
    QList<int> references;

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    FindUsages findUsages(context);
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    findUsages(symbol);
    references = findUsages.references();

    return references;
}

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static void find_helper(QFutureInterface<Usage> &future,
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                        const CppTools::CppModelManagerInterface::WorkingCopy workingCopy,
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                        const LookupContext context,
                        const DependencyTable dependencyTable,
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                        Symbol *symbol)
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{
    QTime tm;
    tm.start();
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    const Identifier *symbolId = symbol->identifier();
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    Q_ASSERT(symbolId != 0);

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    const QString sourceFile = QString::fromUtf8(symbol->fileName(), symbol->fileNameLength());
    QStringList files(sourceFile);
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    if (symbol->isClass() || symbol->isForwardClassDeclaration()) {
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        foreach (const Document::Ptr &doc, context.snapshot()) {
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            if (doc->fileName() == sourceFile)
                continue;

            Control *control = doc->control();

            if (control->findIdentifier(symbolId->chars(), symbolId->size()))
                files.append(doc->fileName());
        }
    } else {
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        files += dependencyTable.filesDependingOn(sourceFile);
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    }
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    files.removeDuplicates();
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    //qDebug() << "done in:" << tm.elapsed() << "number of files to parse:" << files.size();
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    future.setProgressRange(0, files.size());

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    ProcessFile process(workingCopy, context.snapshot(), context.thisDocument(), symbol);
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    UpdateUI reduce(&future);
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    QtConcurrent::blockingMappedReduced<QList<Usage> > (files, process, reduce);
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    future.setProgressValue(files.size());
}

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static CPlusPlus::DependencyTable dependencyTable(DependencyTable previous, CPlusPlus::Snapshot snapshot)
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{
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    if (previous.isValidFor(snapshot))
        return previous;

    DependencyTable table;
    table.build(snapshot);
    return table;
}

void CppFindReferences::updateDependencyTable()
{
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    m_deps = dependencyTable(m_deps, _modelManager->snapshot());
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}

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void CppFindReferences::findUsages(CPlusPlus::Symbol *symbol, const CPlusPlus::LookupContext &context)
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{
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    Find::SearchResult *search = _resultWindow->startNewSearch(Find::SearchResultWindow::SearchOnly);

    connect(search, SIGNAL(activated(Find::SearchResultItem)),
            this, SLOT(openEditor(Find::SearchResultItem)));

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    findAll_helper(symbol, context);
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}

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void CppFindReferences::renameUsages(CPlusPlus::Symbol *symbol, const CPlusPlus::LookupContext &context)
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{
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    if (const Identifier *id = symbol->identifier()) {
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        const QString textToReplace = QString::fromUtf8(id->chars(), id->size());
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        Find::SearchResult *search = _resultWindow->startNewSearch(Find::SearchResultWindow::SearchAndReplace);
        _resultWindow->setTextToReplace(textToReplace);
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        connect(search, SIGNAL(activated(Find::SearchResultItem)),
                this, SLOT(openEditor(Find::SearchResultItem)));
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        connect(search, SIGNAL(replaceButtonClicked(QString,QList<Find::SearchResultItem>)),
                SLOT(onReplaceButtonClicked(QString,QList<Find::SearchResultItem>)));

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        findAll_helper(symbol, context);
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    }
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}

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void CppFindReferences::findAll_helper(Symbol *symbol, const LookupContext &context)
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{
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    if (! (symbol && symbol->identifier()))
        return;

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    _resultWindow->popup(true);

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    const Snapshot snapshot = _modelManager->snapshot();
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    const CppTools::CppModelManagerInterface::WorkingCopy workingCopy = _modelManager->workingCopy();
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    Core::ProgressManager *progressManager = Core::ICore::instance()->progressManager();
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    updateDependencyTable(); // ensure the dependency table is updated
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    QFuture<Usage> result;

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    result = QtConcurrent::run(&find_helper, workingCopy, context, m_deps, symbol);
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    m_watcher.setFuture(result);

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    Core::FutureProgress *progress = progressManager->addTask(result, tr("Searching"),
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                                                              CppTools::Constants::TASK_SEARCH);
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    connect(progress, SIGNAL(clicked()), _resultWindow, SLOT(popup()));
}

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void CppFindReferences::onReplaceButtonClicked(const QString &text,
                                               const QList<Find::SearchResultItem> &items)
{
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    Core::EditorManager::instance()->hideEditorInfoBar(QLatin1String("CppEditor.Rename"));

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    const QStringList fileNames = TextEditor::BaseFileFind::replaceAll(text, items);
    if (!fileNames.isEmpty()) {
        _modelManager->updateSourceFiles(fileNames);
        _resultWindow->hide();
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    }
}

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void CppFindReferences::displayResults(int first, int last)
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{
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    for (int index = first; index != last; ++index) {
        Usage result = m_watcher.future().resultAt(index);
        _resultWindow->addResult(result.path,
                                 result.line,
                                 result.lineText,
                                 result.col,
                                 result.len);
    }
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}

void CppFindReferences::searchFinished()
{
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    _resultWindow->finishSearch();
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    emit changed();
}

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void CppFindReferences::openEditor(const Find::SearchResultItem &item)
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{
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    TextEditor::BaseTextEditor::openEditorAt(item.fileName, item.lineNumber, item.searchTermStart);
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}

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namespace {

class FindMacroUsesInFile: public std::unary_function<QString, QList<Usage> >
{
    const CppTools::CppModelManagerInterface::WorkingCopy workingCopy;
    const Snapshot snapshot;
    const Macro &macro;

public:
    FindMacroUsesInFile(const CppTools::CppModelManagerInterface::WorkingCopy &workingCopy,
                        const Snapshot snapshot,
                        const Macro &macro)
        : workingCopy(workingCopy), snapshot(snapshot), macro(macro)
    { }

    QList<Usage> operator()(const QString &fileName)
    {
        QList<Usage> usages;

        const Document::Ptr &doc = snapshot.document(fileName);
        QByteArray source;

        foreach (const Document::MacroUse &use, doc->macroUses()) {
            const Macro &useMacro = use.macro();
            if (useMacro.line() == macro.line()
                && useMacro.fileName() == macro.fileName())
                {
                if (source.isEmpty())
                    source = getSource(fileName, workingCopy).toLatin1(); // ### FIXME: Encoding?

                unsigned lineStart;
                const QString &lineSource = matchingLine(use.begin(), source, &lineStart);
                usages.append(Usage(fileName, lineSource, use.beginLine(),
                                    use.begin() - lineStart, use.length()));
            }
        }

        return usages;
    }

    // ### FIXME: Pretty close to FindUsages::matchingLine.
    static QString matchingLine(unsigned position, const QByteArray &source,
                                unsigned *lineStart = 0)
    {
        const char *beg = source.constData();
        const char *start = beg + position;
        for (; start != beg - 1; --start) {
            if (*start == '\n')
                break;
        }

        ++start;

        const char *end = start + 1;
        for (; *end; ++end) {
            if (*end == '\n')
                break;
        }

        if (lineStart)
            *lineStart = start - beg;

        // ### FIXME: Encoding?
        const QString matchingLine = QString::fromUtf8(start, end - start);
        return matchingLine;
    }
};

} // end of anonymous namespace

static void findMacroUses_helper(QFutureInterface<Usage> &future,
                        const CppTools::CppModelManagerInterface::WorkingCopy workingCopy,
                        const Snapshot snapshot,
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                        DependencyTable dependencyTable,
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                        const Macro macro)
{
    const QString& sourceFile = macro.fileName();
    QStringList files(sourceFile);
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    files += dependencyTable.filesDependingOn(sourceFile);
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    files.removeDuplicates();

    future.setProgressRange(0, files.size());

    FindMacroUsesInFile process(workingCopy, snapshot, macro);
    UpdateUI reduce(&future);
    QtConcurrent::blockingMappedReduced<QList<Usage> > (files, process, reduce);

    future.setProgressValue(files.size());
}

void CppFindReferences::findMacroUses(const Macro &macro)
{
    Find::SearchResult *search = _resultWindow->startNewSearch(Find::SearchResultWindow::SearchOnly);

    _resultWindow->popup(true);

    connect(search, SIGNAL(activated(Find::SearchResultItem)),
            this, SLOT(openEditor(Find::SearchResultItem)));

    const Snapshot snapshot = _modelManager->snapshot();
    const CppTools::CppModelManagerInterface::WorkingCopy workingCopy = _modelManager->workingCopy();

    // add the macro definition itself
    {
        // ### FIXME: Encoding?
        const QByteArray &source = getSource(macro.fileName(), workingCopy).toLatin1();
        _resultWindow->addResult(macro.fileName(), macro.line(),
                                 source.mid(macro.offset(), macro.length()), 0, macro.length());
    }

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    updateDependencyTable(); // ensure the dependency table is updated
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    QFuture<Usage> result;
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    result = QtConcurrent::run(&findMacroUses_helper, workingCopy, snapshot, m_deps, macro);
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    m_watcher.setFuture(result);

    Core::ProgressManager *progressManager = Core::ICore::instance()->progressManager();
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    Core::FutureProgress *progress = progressManager->addTask(result, tr("Searching"),
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                                                              CppTools::Constants::TASK_SEARCH);
    connect(progress, SIGNAL(clicked()), _resultWindow, SLOT(popup()));
}