/**************************************************************************
**
** This file is part of Qt Creator
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** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
**
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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 "qtscripteditor.h"
#include "qtscripteditorconstants.h"
#include "qtscripthighlighter.h"
#include "qtscripteditorplugin.h"

#include "parser/javascriptengine_p.h"
#include "parser/javascriptparser_p.h"
#include "parser/javascriptlexer_p.h"
#include "parser/javascriptnodepool_p.h"
#include "parser/javascriptastvisitor_p.h"
#include "parser/javascriptast_p.h"

#include <indenter.h>

#include <coreplugin/icore.h>
#include <coreplugin/actionmanager/actionmanager.h>
#include <texteditor/basetextdocument.h>
#include <texteditor/fontsettings.h>
#include <texteditor/textblockiterator.h>
#include <texteditor/texteditorconstants.h>

#include <QtGui/QMenu>
#include <QtCore/QTimer>

enum {
    UPDATE_DOCUMENT_DEFAULT_INTERVAL = 100
};

namespace QtScriptEditor {
namespace Internal {

ScriptEditorEditable::ScriptEditorEditable(ScriptEditor *editor, const QList<int>& context)
    : BaseTextEditorEditable(editor), m_context(context)
{
}

ScriptEditor::ScriptEditor(const Context &context,
                           TextEditor::TextEditorActionHandler *ah,
                           QWidget *parent) :
    TextEditor::BaseTextEditor(parent),
    m_context(context),
    m_ah(ah)
{
    setParenthesesMatchingEnabled(true);
    setMarksVisible(true);
    setCodeFoldingSupported(true);
    setCodeFoldingVisible(true);
    setMimeType(QtScriptEditor::Constants::C_QTSCRIPTEDITOR_MIMETYPE);

    m_updateDocumentTimer = new QTimer(this);
    m_updateDocumentTimer->setInterval(UPDATE_DOCUMENT_DEFAULT_INTERVAL);
    m_updateDocumentTimer->setSingleShot(true);

    connect(m_updateDocumentTimer, SIGNAL(timeout()), this, SLOT(updateDocumentNow()));

    connect(this, SIGNAL(textChanged()), this, SLOT(updateDocument()));

    baseTextDocument()->setSyntaxHighlighter(new QtScriptHighlighter);
}

ScriptEditor::~ScriptEditor()
{
}

Core::IEditor *ScriptEditorEditable::duplicate(QWidget *parent)
{
    return qobject_cast<ScriptEditor*>(editor())->duplicate(parent)->editableInterface();
}

ScriptEditor *ScriptEditor::duplicate(QWidget *parent)
{
    ScriptEditor *editor = new ScriptEditor(m_context, m_ah, parent);
    editor->duplicateFrom(this);
    QtScriptEditorPlugin::initializeEditor(editor);
    return editor;
}

const char *ScriptEditorEditable::kind() const
{
    return QtScriptEditor::Constants::C_QTSCRIPTEDITOR;
}

ScriptEditor::Context ScriptEditorEditable::context() const
{
    return m_context;
}

void ScriptEditor::updateDocument()
{
    m_updateDocumentTimer->start(UPDATE_DOCUMENT_DEFAULT_INTERVAL);
}

void ScriptEditor::updateDocumentNow()
{
    // ### move in the parser thread.

    m_updateDocumentTimer->stop();

    const QString fileName = file()->fileName();
    const QString code = toPlainText();

    JavaScriptParser parser;
    JavaScriptEnginePrivate driver;

    JavaScript::NodePool nodePool(fileName, &driver);
    driver.setNodePool(&nodePool);

    JavaScript::Lexer lexer(&driver);
    lexer.setCode(code, /*line = */ 1);
    driver.setLexer(&lexer);

    QList<QTextEdit::ExtraSelection> selections;

    if (parser.parse(&driver)) {
        // do something here
    } else {
        QTextEdit::ExtraSelection sel;
        sel.format.setUnderlineColor(Qt::red);
        sel.format.setUnderlineStyle(QTextCharFormat::WaveUnderline);

        const int line = parser.errorLineNumber();

        QTextCursor c(document()->findBlockByNumber(line - 1));
        sel.cursor = c;

        if (parser.errorColumnNumber() > 1)
            sel.cursor.setPosition(c.position() + parser.errorColumnNumber() - 1);

        sel.cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);

        selections.append(sel);
    }

    setExtraSelections(CodeWarningsSelection, selections);
}

void ScriptEditor::setFontSettings(const TextEditor::FontSettings &fs)
{
    TextEditor::BaseTextEditor::setFontSettings(fs);
    QtScriptHighlighter *highlighter = qobject_cast<QtScriptHighlighter*>(baseTextDocument()->syntaxHighlighter());
    if (!highlighter)
        return;

    static QVector<QString> categories;
    if (categories.isEmpty()) {
        categories << QLatin1String(TextEditor::Constants::C_NUMBER)
                   << QLatin1String(TextEditor::Constants::C_STRING)
                   << QLatin1String(TextEditor::Constants::C_TYPE)
                   << QLatin1String(TextEditor::Constants::C_KEYWORD)
                   << QLatin1String(TextEditor::Constants::C_PREPROCESSOR)
                   << QLatin1String(TextEditor::Constants::C_LABEL)
                   << QLatin1String(TextEditor::Constants::C_COMMENT);
    }

    highlighter->setFormats(fs.toTextCharFormats(categories));
    highlighter->rehighlight();
}

bool ScriptEditor::isElectricCharacter(const QChar &ch) const
{
    if (ch == QLatin1Char('{') || ch == QLatin1Char('}'))
        return true;
    return false;
}

    // Indent a code line based on previous
template <class Iterator>
static void indentScriptBlock(const TextEditor::TabSettings &ts,
                              const QTextBlock &block,
                              const Iterator &programBegin,
                              const Iterator &programEnd,
                              QChar typedChar)
{
    typedef typename SharedTools::Indenter<Iterator> Indenter ;
    Indenter &indenter = Indenter::instance();
    indenter.setIndentSize(ts.m_tabSize);
    const TextEditor::TextBlockIterator current(block);
    const int indent = indenter.indentForBottomLine(current, programBegin,
                                                    programEnd, typedChar);
    ts.indentLine(block, indent);
}

void ScriptEditor::indentBlock(QTextDocument *doc, QTextBlock block, QChar typedChar)
{
    const TextEditor::TextBlockIterator begin(doc->begin());
    const TextEditor::TextBlockIterator end(block.next());
    indentScriptBlock(tabSettings(), block, begin, end, typedChar);
}

void ScriptEditor::contextMenuEvent(QContextMenuEvent *e)
{
    QMenu *menu = createStandardContextMenu();

    if (Core::ActionContainer *mcontext = Core::ICore::instance()->actionManager()->actionContainer(QtScriptEditor::Constants::M_CONTEXT)) {
        QMenu *contextMenu = mcontext->menu();
        foreach (QAction *action, contextMenu->actions())
            menu->addAction(action);
    }

    menu->exec(e->globalPos());
    delete menu;
}

} // namespace Internal
} // namespace QtScriptEditor