//    Copyright (C) 2020-2021 Jakub Melka
//
//    This file is part of PDF4QT.
//
//    PDF4QT is free software: you can redistribute it and/or modify
//    it under the terms of the GNU Lesser General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    with the written consent of the copyright owner, any later version.
//
//    PDF4QT is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU Lesser General Public License for more details.
//
//    You should have received a copy of the GNU Lesser General Public License
//    along with PDF4QT.  If not, see <https://www.gnu.org/licenses/>.

#include "pdftoolinfojavascript.h"
#include "pdfjavascriptscanner.h"

namespace pdftool
{

static PDFToolInfoJavaScriptApplication s_infoJavaScriptApplication;

QString PDFToolInfoJavaScriptApplication::getStandardString(StandardString standardString) const
{
    switch (standardString)
    {
        case Command:
            return "info-javascript";

        case Name:
            return PDFToolTranslationContext::tr("Info (JavaScript code)");

        case Description:
            return PDFToolTranslationContext::tr("Retrieve informations about JavaScript usage in a document.");

        default:
            Q_ASSERT(false);
            break;
    }

    return QString();
}

int PDFToolInfoJavaScriptApplication::execute(const PDFToolOptions& options)
{
    pdf::PDFDocument document;
    QByteArray sourceData;
    if (!readDocument(options, document, &sourceData, false))
    {
        return ErrorDocumentReading;
    }

    QString parseError;
    std::vector<pdf::PDFInteger> pages = options.getPageRange(document.getCatalog()->getPageCount(), parseError, true);

    if (!parseError.isEmpty())
    {
        PDFConsole::writeError(parseError, options.outputCodec);
        return ErrorInvalidArguments;
    }

    pdf::PDFJavaScriptScanner scanner(&document);
    pdf::PDFJavaScriptScanner::Entries javascripts = scanner.scan(pages, pdf::PDFJavaScriptScanner::ScanMask | pdf::PDFJavaScriptScanner::Optimize);

    QLocale locale;

    PDFOutputFormatter formatter(options.outputStyle);
    formatter.beginDocument("info-javascripts", PDFToolTranslationContext::tr("JavaScript used in document %1").arg(options.document));
    formatter.endl();

    formatter.beginTable("overview", PDFToolTranslationContext::tr("JavaScript Usage Overview"));

    formatter.beginTableHeaderRow("header");
    formatter.writeTableHeaderColumn("no", PDFToolTranslationContext::tr("No."), Qt::AlignLeft);
    formatter.writeTableHeaderColumn("context", PDFToolTranslationContext::tr("Context"), Qt::AlignLeft);
    formatter.writeTableHeaderColumn("page-number", PDFToolTranslationContext::tr("Page Number"), Qt::AlignLeft);
    formatter.writeTableHeaderColumn("code-size", PDFToolTranslationContext::tr("Code Size"), Qt::AlignLeft);
    formatter.writeTableHeaderColumn("code-snippet", PDFToolTranslationContext::tr("Code Snippet"), Qt::AlignLeft);
    formatter.endTableHeaderRow();

    int ref = 1;
    for (const pdf::PDFJavaScriptEntry& entry : javascripts)
    {
        formatter.beginTableRow("javascript", ref);

        QString contextText;
        switch (entry.type)
        {
            case pdf::PDFJavaScriptEntry::Type::Document:
                contextText = PDFToolTranslationContext::tr("Document");
                break;

            case pdf::PDFJavaScriptEntry::Type::Named:
                contextText = PDFToolTranslationContext::tr("Named");
                break;

            case pdf::PDFJavaScriptEntry::Type::Form:
                contextText = PDFToolTranslationContext::tr("Form");
                break;

            case pdf::PDFJavaScriptEntry::Type::Page:
                contextText = PDFToolTranslationContext::tr("Page");
                break;

            case pdf::PDFJavaScriptEntry::Type::Annotation:
                contextText = PDFToolTranslationContext::tr("Annotation");
                break;

            default:
                Q_ASSERT(false);
                break;
        }

        formatter.writeTableColumn("no", locale.toString(ref), Qt::AlignRight);
        formatter.writeTableColumn("context", contextText);
        formatter.writeTableColumn("page-number", (entry.pageIndex != -1) ? locale.toString(entry.pageIndex + 1) : QString(), Qt::AlignRight);
        formatter.writeTableColumn("code-size", locale.toString(entry.javaScript.size()), Qt::AlignRight);
        formatter.writeTableColumn("code-snippet", entry.javaScript.left(64));

        formatter.endTableRow();
        ++ref;
    }

    formatter.endTable();

    formatter.endl();

    formatter.beginHeader("details", PDFToolTranslationContext::tr("Details"));

    ref = 1;
    for (const pdf::PDFJavaScriptEntry& entry : javascripts)
    {
        formatter.endl();
        formatter.beginHeader("javascript", PDFToolTranslationContext::tr("JavaScript #%1").arg(ref), ref);
        formatter.writeText("code", entry.javaScript);
        formatter.endHeader();
        ++ref;
    }

    formatter.endHeader();

    formatter.endDocument();
    PDFConsole::writeText(formatter.getString(), options.outputCodec);

    return ExitSuccess;
}

PDFToolAbstractApplication::Options PDFToolInfoJavaScriptApplication::getOptionsFlags() const
{
    return ConsoleFormat | OpenDocument | PageSelector;
}

}   // namespace pdftool