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**
** This file is part of Qt Creator
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**
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**
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** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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**
** 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.
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#include "cpprefactoringchanges.h"

#include <TranslationUnit.h>
#include <AST.h>
#include <cpptools/cppcodeformatter.h>
#include <texteditor/texteditorsettings.h>
#include <texteditor/tabsettings.h>

#include <QtGui/QTextBlock>

using namespace CppEditor;
using namespace CPlusPlus;
using namespace Utils;

CppRefactoringChanges::CppRefactoringChanges(const Document::Ptr &thisDocument, const Snapshot &snapshot)
    : m_thisDocument(thisDocument)
    , m_snapshot(snapshot)
    , m_context(m_thisDocument, m_snapshot)
    , m_modelManager(CppTools::CppModelManagerInterface::instance())
{
    Q_ASSERT(m_modelManager);
    m_workingCopy = m_modelManager->workingCopy();
}

Document::Ptr CppRefactoringChanges::thisDocument() const
{
    return m_thisDocument;
}

const Snapshot &CppRefactoringChanges::snapshot() const
{
    return m_snapshot;
}

const LookupContext &CppRefactoringChanges::context() const
{
    return m_context;
}

CppRefactoringFile CppRefactoringChanges::file(const QString &fileName)
{
    return CppRefactoringFile(fileName, this);
}

void CppRefactoringChanges::indentSelection(const QTextCursor &selection) const
{
    // ### shares code with CPPEditor::indent()
    QTextDocument *doc = selection.document();

    QTextBlock block = doc->findBlock(selection.selectionStart());
    const QTextBlock end = doc->findBlock(selection.selectionEnd()).next();

    const TextEditor::TabSettings &tabSettings(TextEditor::TextEditorSettings::instance()->tabSettings());
    CppTools::QtStyleCodeFormatter codeFormatter(tabSettings);
    codeFormatter.updateStateUntil(block);

    do {
        tabSettings.indentLine(block, codeFormatter.indentFor(block));
        codeFormatter.updateLineStateChange(block);
        block = block.next();
    } while (block.isValid() && block != end);
}

void CppRefactoringChanges::fileChanged(const QString &fileName)
{
    m_modelManager->updateSourceFiles(QStringList(fileName));
}


CppRefactoringFile::CppRefactoringFile()
{ }

CppRefactoringFile::CppRefactoringFile(const QString &fileName, CppRefactoringChanges *refactoringChanges)
    : RefactoringFile(fileName, refactoringChanges)
{ }

Document::Ptr CppRefactoringFile::cppDocument() const
{
    if (!m_cppDocument) {
        const QString source = document()->toPlainText();
        const QString name = fileName();
        const Snapshot &snapshot = refactoringChanges()->snapshot();

        const QByteArray contents = snapshot.preprocessedCode(source, name);
        m_cppDocument = snapshot.documentFromSource(contents, name);
        m_cppDocument->check();
    }

    return m_cppDocument;
}

Scope *CppRefactoringFile::scopeAt(unsigned index) const
{
    unsigned line, column;
    cppDocument()->translationUnit()->getTokenStartPosition(index, &line, &column);
    return cppDocument()->scopeAt(line, column);
}

bool CppRefactoringFile::isCursorOn(unsigned tokenIndex) const
{
    QTextCursor tc = cursor();
    int cursorBegin = tc.selectionStart();

    int start = startOf(tokenIndex);
    int end = endOf(tokenIndex);

    if (cursorBegin >= start && cursorBegin <= end)
        return true;

    return false;
}

bool CppRefactoringFile::isCursorOn(const AST *ast) const
{
    QTextCursor tc = cursor();
    int cursorBegin = tc.selectionStart();

    int start = startOf(ast);
    int end = endOf(ast);

    if (cursorBegin >= start && cursorBegin <= end)
        return true;

    return false;
}

ChangeSet::Range CppRefactoringFile::range(unsigned tokenIndex) const
{
    const Token &token = tokenAt(tokenIndex);
    unsigned line, column;
    cppDocument()->translationUnit()->getPosition(token.begin(), &line, &column);
    const int start = document()->findBlockByNumber(line - 1).position() + column - 1;
    return ChangeSet::Range(start, start + token.length());
}

ChangeSet::Range CppRefactoringFile::range(AST *ast) const
{
    return ChangeSet::Range(startOf(ast), endOf(ast));
}

int CppRefactoringFile::startOf(unsigned index) const
{
    unsigned line, column;
    cppDocument()->translationUnit()->getPosition(tokenAt(index).begin(), &line, &column);
    return document()->findBlockByNumber(line - 1).position() + column - 1;
}

int CppRefactoringFile::startOf(const AST *ast) const
{
    return startOf(ast->firstToken());
}

int CppRefactoringFile::endOf(unsigned index) const
{
    unsigned line, column;
    cppDocument()->translationUnit()->getPosition(tokenAt(index).end(), &line, &column);
    return document()->findBlockByNumber(line - 1).position() + column - 1;
}

int CppRefactoringFile::endOf(const AST *ast) const
{
    if (unsigned end = ast->lastToken())
        return endOf(end - 1);
    else
        return 0;
}

void CppRefactoringFile::startAndEndOf(unsigned index, int *start, int *end) const
{
    unsigned line, column;
    Token token(tokenAt(index));
    cppDocument()->translationUnit()->getPosition(token.begin(), &line, &column);
    *start = document()->findBlockByNumber(line - 1).position() + column - 1;
    *end = *start + token.length();
}

QString CppRefactoringFile::textOf(const AST *ast) const
{
    return textOf(startOf(ast), endOf(ast));
}

const Token &CppRefactoringFile::tokenAt(unsigned index) const
{
    return cppDocument()->translationUnit()->tokenAt(index);
}

CppRefactoringChanges *CppRefactoringFile::refactoringChanges() const
{
    return static_cast<CppRefactoringChanges *>(m_refactoringChanges);
}