/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2010 Daniel Marjamäki and Cppcheck team.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <QObject>
#include <QString>
#include <QXmlStreamReader>
#include <QXmlStreamWriter>
#include <QFile>
#include "projectfile.h"

static const char ProjectElementName[] = "project";
static const char ProjectVersionAttrib[] = "version";
static const char ProjectFileVersion[] = "1";
static const char IncludDirElementName[] = "includedir";
static const char DirElementName[] = "dir";
static const char DirNameAttrib[] = "name";
static const char DefinesElementName[] = "defines";
static const char DefineName[] = "define";
static const char DefineNameAttrib[] = "name";

ProjectFile::ProjectFile(QObject *parent) :
    QObject(parent)
{
}

ProjectFile::ProjectFile(const QString &filename, QObject *parent) :
    QObject(parent),
    mFilename(filename)
{
}

bool ProjectFile::Read(const QString &filename)
{
    if (!filename.isEmpty())
        mFilename = filename;

    QFile file(mFilename);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
        return false;

    QXmlStreamReader xmlReader(&file);
    bool insideProject = false;
    bool projectTagFound = false;
    while (!xmlReader.atEnd())
    {
        switch (xmlReader.readNext())
        {
        case QXmlStreamReader::StartElement:
            if (xmlReader.name() == ProjectElementName)
            {
                insideProject = true;
                projectTagFound = true;
            }

            // Find include directory from inside project element
            if (insideProject && xmlReader.name() == IncludDirElementName)
                ReadIncludeDirs(xmlReader);

            // Find preprocessor define from inside project element
            if (insideProject && xmlReader.name() == DefinesElementName)
                ReadDefines(xmlReader);

            break;

        case QXmlStreamReader::EndElement:
            if (xmlReader.name() == ProjectElementName)
                insideProject = false;
            break;

            // Not handled
        case QXmlStreamReader::NoToken:
        case QXmlStreamReader::Invalid:
        case QXmlStreamReader::StartDocument:
        case QXmlStreamReader::EndDocument:
        case QXmlStreamReader::Characters:
        case QXmlStreamReader::Comment:
        case QXmlStreamReader::DTD:
        case QXmlStreamReader::EntityReference:
        case QXmlStreamReader::ProcessingInstruction:
            break;
        }
    }

    file.close();
    if (projectTagFound)
        return true;
    else
        return false;
}

QStringList ProjectFile::GetIncludeDirs() const
{
    return mIncludeDirs;
}

QStringList ProjectFile::GetDefines() const
{
    return mDefines;
}

void ProjectFile::ReadIncludeDirs(QXmlStreamReader &reader)
{
    QXmlStreamReader::TokenType type;
    bool allRead = false;
    do
    {
        type = reader.readNext();
        switch (type)
        {
        case QXmlStreamReader::StartElement:

            // Read dir-elements
            if (reader.name().toString() == DirElementName)
            {
                QXmlStreamAttributes attribs = reader.attributes();
                QString name = attribs.value("", DirNameAttrib).toString();
                if (!name.isEmpty())
                    mIncludeDirs << name;
            }
            break;

        case QXmlStreamReader::EndElement:
            if (reader.name().toString() == IncludDirElementName)
                allRead = true;
            break;

            // Not handled
        case QXmlStreamReader::NoToken:
        case QXmlStreamReader::Invalid:
        case QXmlStreamReader::StartDocument:
        case QXmlStreamReader::EndDocument:
        case QXmlStreamReader::Characters:
        case QXmlStreamReader::Comment:
        case QXmlStreamReader::DTD:
        case QXmlStreamReader::EntityReference:
        case QXmlStreamReader::ProcessingInstruction:
            break;
        }
    }
    while (!allRead);
}

void ProjectFile::ReadDefines(QXmlStreamReader &reader)
{
    QXmlStreamReader::TokenType type;
    bool allRead = false;
    do
    {
        type = reader.readNext();
        switch (type)
        {
        case QXmlStreamReader::StartElement:
            // Read define-elements
            if (reader.name().toString() == DefineName)
            {
                QXmlStreamAttributes attribs = reader.attributes();
                QString name = attribs.value("", DefineNameAttrib).toString();
                if (!name.isEmpty())
                    mDefines << name;
            }
            break;

        case QXmlStreamReader::EndElement:
            if (reader.name().toString() == DefinesElementName)
                allRead = true;
            break;

            // Not handled
        case QXmlStreamReader::NoToken:
        case QXmlStreamReader::Invalid:
        case QXmlStreamReader::StartDocument:
        case QXmlStreamReader::EndDocument:
        case QXmlStreamReader::Characters:
        case QXmlStreamReader::Comment:
        case QXmlStreamReader::DTD:
        case QXmlStreamReader::EntityReference:
        case QXmlStreamReader::ProcessingInstruction:
            break;
        }
    }
    while (!allRead);
}

void ProjectFile::SetIncludes(QStringList includes)
{
    mIncludeDirs = includes;
}

void ProjectFile::SetDefines(QStringList defines)
{
    mDefines = defines;
}

bool ProjectFile::Write(const QString &filename)
{
    if (!filename.isEmpty())
        mFilename = filename;

    QFile file(mFilename);
    if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
        return false;

    QXmlStreamWriter xmlWriter(&file);
    xmlWriter.setAutoFormatting(true);
    xmlWriter.writeStartDocument("1.0");
    xmlWriter.writeStartElement(ProjectElementName);
    xmlWriter.writeAttribute(ProjectVersionAttrib, ProjectFileVersion);

    if (!mIncludeDirs.isEmpty())
    {
        xmlWriter.writeStartElement(IncludDirElementName);
        QString incdir;
        foreach(incdir, mIncludeDirs)
        {
            xmlWriter.writeStartElement(DirElementName);
            xmlWriter.writeAttribute(DirNameAttrib, incdir);
            xmlWriter.writeEndElement();
        }
        xmlWriter.writeEndElement();
    }

    if (!mDefines.isEmpty())
    {
        xmlWriter.writeStartElement(DefinesElementName);
        QString define;
        foreach(define, mDefines)
        {
            xmlWriter.writeStartElement(DefineName);
            xmlWriter.writeAttribute(DefineNameAttrib, define);
            xmlWriter.writeEndElement();
        }
        xmlWriter.writeEndElement();
    }
    xmlWriter.writeEndDocument();
    file.close();
    return true;
}