/****************************************************************************
**
** Copyright (C) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the Qt Script Generator project on Qt Labs.
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** contained in the Technology Preview License Agreement accompanying
** this package.
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** 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
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****************************************************************************/

#include <algorithm> // for std::sort

#include "prigenerator.h"
#include "shellgenerator.h"
#include "reporthandler.h"
#include "fileout.h"

void PriGenerator::addHeader(const QString& folder, const QString& header)
{
  priHash[folder].headers << header;
}

void PriGenerator::addSource(const QString& folder, const QString& source)
{
  priHash[folder].sources << source;
}

static void collectAndRemoveFile(QTextStream& stream, const QString& file)
{
  QFile f(file);
  if (f.open(QIODevice::ReadOnly | QIODevice::Text)) {
    QString s = QString::fromLatin1(f.readAll());
    if (file.endsWith(".cpp")) {
      // remove first line include
      s = s.mid(s.indexOf('\n') + 1);
    }
    stream << s;
    f.close();
    QFile::remove(file);
  }
}

static QString combineIncludes(const QString& text)
{
  QStringList lines = text.split('\n');
  QSet<QString> includes;
  QString result;
  for (QString line : lines) {
    if (line.startsWith("#include")) {
      includes.insert(line);
    } else if (line.startsWith("#") && line.contains("PYTHONQTWRAPPER_")) {
      // skip preprocessor defines for single wrapped classes
    } else {
      result += line + "\n";
    }
  }
#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
  QStringList includeList = includes.toList();
#else
  QStringList includeList(includes.begin(), includes.end());
#endif
  std::sort(includeList.begin(), includeList.end());
  result = includeList.join("\n") + result;
  return result;
}

QStringList PriGenerator::compactFiles(const QStringList& list, const QString& ext, const QString& dir,
  const QString& prefix)
{
  QStringList outList;
  int count = list.count();
  int fileNum = 0;
  QString srcDir = dir;
  if (dir.endsWith("_builtin")) {
    srcDir = dir.left(dir.length() - strlen("_builtin"));
  }
  while (count > 0) {
    QString outFileName = prefix + QString::number(fileNum) + ext;
    FileOut file(dir + "/" + outFileName);
    if (ext == ".cpp") {
      file.stream << "#include \"" + prefix + QString::number(fileNum) + ".h\"\n";
    }
    outList << outFileName;
    QString allText;
    QTextStream ts(&allText);
    for (int i = 0; i < maxClassesPerFile && count > 0; i++) {
      collectAndRemoveFile(ts, srcDir + "/" + list.at(list.count() - count));
      count--;
    }
    allText = combineIncludes(allText);
    file.stream << allText;
    fileNum++;
  }
  return outList;
}

void PriGenerator::generate()
{
  QHashIterator<QString, Pri> pri(priHash);
  while (pri.hasNext()) {
    pri.next();
    QStringList list = pri.value().headers;
    if (list.isEmpty())
      continue;

    QString folder = pri.key();
    folder.replace('\\', '/');
    int idx = folder.indexOf('/');
    folder = folder.left(idx);

    std::sort(list.begin(), list.end());
    FileOut file(m_out_dir + "/generated_cpp/" + pri.key());

    // strange idea to do the file compacting so late, but it is the most effective way without patching the generator a lot
    bool compact = true;
    if (compact) {
      list = compactFiles(list, ".h", m_out_dir + "/generated_cpp/" + folder, folder);
    }

    file.stream << "HEADERS += \\\n";
    for (const QString& entry : list) {
      file.stream << "           $$PWD/" << entry << " \\\n";
    }

    file.stream << "\n";
    file.stream << "SOURCES += \\\n";
    list = pri.value().sources;
    std::sort(list.begin(), list.end());
    if (compact) {
      list = compactFiles(list, ".cpp", m_out_dir + "/generated_cpp/" + folder, folder);
    }
    for (const QString& entry : list) {
      file.stream << "           $$PWD/" << entry << " \\\n";
    }
    file.stream << "           $$PWD/" << folder << "_init.cpp\n";

    if (file.done())
      ++m_num_generated_written;
    ++m_num_generated;
  }
}
