/****************************************************************************
**
** Copyright (C) 1992-2005 Trolltech AS. All rights reserved.
**
** This file is part of the qt3to4 porting application of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include <QString>
#include <QFile>
#include <QFileInfo>
#include <QDir>
#include <QByteArray>
#include <QBuffer>
#include <QTextStream>
#include <QCoreApplication>
#include <QLibraryInfo>
#include <QDebug>

#include "projectporter.h"
#include "fileporter.h"
#include "logger.h"
#include "preprocessorcontrol.h"

QString rulesFilePath;
QString applicationDirPath;

QString findRulesFile(const QString &fileName)
{
    // Check QLibraryInfo::DataPath/filename
    QString filePath;
    filePath = QDir::cleanPath(QLibraryInfo::location(QLibraryInfo::DataPath) + "/" + fileName)  ;
    if (QFile::exists(filePath))
        return QFileInfo(filePath).canonicalFilePath();

    // Check QLibraryInfo::PrefixPath/tools/porting/src/filename
    filePath = QDir::cleanPath(QLibraryInfo::location(QLibraryInfo::PrefixPath) + "/tools/porting/src/" + fileName);
    if (QFile::exists(filePath))
        return QFileInfo(filePath).canonicalFilePath();

    //no luck
    return QString();
}

/*
    A option contains an argument and its help text.
*/
class Option
{
public:
    Option(const QString &argument, const QString &description)
    :argument(argument), description(description) {}

    /*
        Checks if candidateArgument matches the options argument.
    */
    bool checkArgument(const QString &candidateArgument) const
    {
        return (candidateArgument == argument) ||
               (candidateArgument.toLower() == argument.toLower());
    }

    QString argument;
    QString description;
};

typedef QList<Option> OptionList;

void usage(const OptionList &optionList)
{
    printf("Tool for porting Qt 3 applications to Qt 4, using the compatibility library\n");
    printf("and compatibility functions in the core library.\n");
    printf("Usage: qt3to4 [options] <Infile>, [Infile], ...\n");
    printf("\n");
    printf("Infile can be a source file or a project file.\n");
    printf("If you specify a project file, ending with .pro or .pri,\n");
    printf("qt3to4 will port all files specified in that project.\n");
    printf("\n");
    printf("Options:\n");

    // Find the length of the longest argument.
    int argumentMaxLenght = 0;
    foreach (const Option option, optionList) {
        if (option.argument.count() > argumentMaxLenght)
            argumentMaxLenght = option.argument.count();
    }

    // Print the options, pad with spaces between the argument and description where needed.
    const int extraSpaces = 5;
    foreach (const Option option, optionList) {
        printf(option.argument.toLocal8Bit().constData());
        for (int i = 0; i < argumentMaxLenght - option.argument.count() + extraSpaces; ++i)
            printf(" ");
        puts(option.description.toLocal8Bit().constData());
    }

    printf("\n");
    printf("The porting documentation contains more information on how\n");
    printf("to use qt3to4 as well as general porting information.\n");
}

int main(int argc, char**argv)
{
    QCoreApplication app(argc, argv);
    applicationDirPath = app.applicationDirPath();
    QString defaultRulesFileName = "q3porting.xml";
    QStringList inFileNames;
    QStringList includeSearchDirectories;
    bool enableCppParsing = true;
    bool useBuildtinQt3Headers = true;
    bool showMissingFilesWarnings = false;
    bool alwaysOverwrite = false;
    int currentArg = 1;

    const Option helpOption("-h", "Display this help.");
    const Option rulesFileOption("-rulesFile", "Specify the location for the rules file.");
    const Option includeDirectoryOption("-I", "Add directory to the list of directories to be searched for header files.");
    const Option disableCppParsingOption("-disableCppParsing", "Disable the C++ parsing component.");
    const Option disableBuiltinQt3HeadersOption("-disableBuiltinQt3Headers", "Do not use the built-in Qt 3 headers.");
    const Option missingFileWarningsOption("-missingFileWarnings", "Warn about files not found while searching for header files.");
    const Option alwaysOverwriteOption("-alwaysOverwrite", "Port all files without prompting.");

    const OptionList optionList = OptionList() << helpOption << alwaysOverwriteOption << rulesFileOption
                                               << includeDirectoryOption << disableCppParsingOption
                                               << disableBuiltinQt3HeadersOption << missingFileWarningsOption;

    if (argc == 1) {
        usage(optionList);
        return 0;
    }

    // Read arguments.
    while (currentArg < argc) {
        QString argText = argv[currentArg];
        if(argText.isEmpty()) {
            continue;
        } else if (argText == "--help" || argText == "/h" || argText == "-help"
            || argText == "-h"  || argText == "-?" || argText == "/?") {
            usage(optionList);
            return 0;
        } else if (rulesFileOption.checkArgument(argText)) {
            ++currentArg;
            if (currentArg >= argc) {
                printf("You must specify a file name along with %s \n", argText.toLocal8Bit().constData());
                return 0;
            }
            rulesFilePath = argv[currentArg];

            if (!QFile::exists(rulesFilePath)) {
                printf("File not found: %s\n", rulesFilePath.toLocal8Bit().constData());
                return 0;
            }
        } else if (includeDirectoryOption.checkArgument(argText)) {
            ++currentArg;
            if (currentArg >= argc) {
                printf("You must specify a directory name along with %s\n",
                     argText.toLocal8Bit().constData());
                return 0;
            }
            includeSearchDirectories += argv[currentArg];
        } else if (disableCppParsingOption.checkArgument(argText)) {
            enableCppParsing = false;
        } else if (disableBuiltinQt3HeadersOption.checkArgument(argText)) {
            useBuildtinQt3Headers = false;
        } else if (missingFileWarningsOption.checkArgument(argText)) {
            showMissingFilesWarnings = true;
        } else if (alwaysOverwriteOption.checkArgument(argText)) {
            alwaysOverwrite = true;
            FileWriter::instance()->setOverwriteFiles(FileWriter::AlwaysOverWrite);
        } else if (argText[0]  == '-') {
            printf("Unknown option %s\n", argText.toLocal8Bit().constData());
            return 0;
        } else {
            inFileNames.append(argText);
        }
        ++currentArg;
    }

    if (rulesFilePath.isEmpty())
        rulesFilePath = findRulesFile(defaultRulesFileName);

    // Check if we have a rule file.
    if (!QFile::exists(rulesFilePath)) {
        printf("Error: Could not find the %s rule file: ", defaultRulesFileName.toLocal8Bit().constData());
        printf("Please try specifying the location of the file with the %s option \n", 
            rulesFileOption.argument.toLocal8Bit().constData());
        return 0;
    }

    // Check if we have any infiles
    if (inFileNames.isEmpty()) {
        printf("You must specify a file name. \n");
        return 0;
    }

    // Read rule file and create PortingRules instance.
    printf("Using rules file: ");
    puts(QDir::convertSeparators(rulesFilePath).toLocal8Bit().constData());
    PortingRules::createInstance(rulesFilePath);


    // Construct a ProjectPorter object add pass it the options.
    QStringList builtinQtheaders;
    if (useBuildtinQt3Headers) {
        builtinQtheaders += ":qt3headers0.resource";
        builtinQtheaders += ":qt3headers1.resource";
        builtinQtheaders += ":qt3headers2.resource";
        builtinQtheaders += ":qt3headers3.resource";
    }

    ProjectPorter porter(QDir::currentPath(), includeSearchDirectories, builtinQtheaders);
    porter.enableCppParsing(enableCppParsing);
    porter.enableMissingFilesWarnings(showMissingFilesWarnings);

    // Determine mode based on file exstesions and port.
    // (The ProjectPorter class is also used for porting single files :)
    foreach (QString inFileName, inFileNames) {
        const QString canonicalFileName = QFileInfo(inFileName).canonicalFilePath();
        if (QFile::exists(canonicalFileName)) {
            if (canonicalFileName.endsWith(".pro") || canonicalFileName.endsWith(".pri"))
                porter.portProject(canonicalFileName);
            else
                porter.portFile(canonicalFileName);
        } else {
            printf("File not found: %s \n", QDir::convertSeparators(inFileName).toLocal8Bit().constData());
        }
    }

    // Write log
    if (Logger::instance()->numEntries() > 0) {
        QStringList report = Logger::instance()->fullReport();
        QString logFileName =  "portinglog.txt";
        printf("Writing log to %s \n", logFileName.toLocal8Bit().constData());
        QByteArray logContents;
        QBuffer logBuffer(&logContents);
        logBuffer.open(QIODevice::Text | QIODevice::WriteOnly);
        QTextStream logStream(&logBuffer);
        foreach (QString logLine, report) {
            logStream << logLine << endl;
        }
        FileWriter fileWriter(FileWriter::AskOnOverWrite, "Overwrite file ");
        if (alwaysOverwrite)
            fileWriter.setOverwriteFiles(FileWriter::AlwaysOverWrite);
        fileWriter.writeFile(logFileName, logContents);
    }
    Logger::deleteInstance();
    PortingRules::deleteInstance();
    return 0;
}
