/***************************************************************************
   Copyright 2006 David Nolden <david.nolden.kdevelop@art-master.de>
***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef INCLUDEPATHRESOLVER_H
#define INCLUDEPATHRESOLVER_H

#include <QString>
#include <QStringList>
#include <language/editor/modificationrevisionset.h>

class KUrl;
class QDir;
class QFile;

namespace CppTools {

class FileModificationTimeWrapper;

struct PathResolutionResult
{
  PathResolutionResult(bool success = false, const QString& errorMessage = QString(), const QString& longErrorMessage = QString())
    : success(success)
    , errorMessage(errorMessage)
    , longErrorMessage(longErrorMessage)
  {
  }
  bool success;
  QString errorMessage;
  QString longErrorMessage;

  KDevelop::ModificationRevisionSet includePathDependency;

  QStringList paths;

  void addPathsUnique(const PathResolutionResult& rhs)
  {
    foreach(const QString& path, rhs.paths) {
      if(!paths.contains(path))
        paths.append(path);
    }
    includePathDependency += rhs.includePathDependency;
  }

  operator bool() const
  {
    return success;
  }
};

struct CustomIncludePathsSettings
{
  QString storagePath; //Directory the custom file is in
  QString sourceDir;
  QString buildDir;
  QStringList paths;

  QString storageFile() const;
  bool isValid() const ;

  static CustomIncludePathsSettings read(const QString& storagePath);
  ///Finds a valid storage file above the given start path that contains custom include paht settings
  ///If no valid storage file is found, returns an empty string
  static QString find(const QString& startPath);
  ///Finds a storage-path for the given start path, and reads the custom include path settings
  ///If none were found, returns an invalid item
  static CustomIncludePathsSettings findAndRead(const QString& startPath);
  ///Same as findAndRead, but also convert all relative paths into absolute ones from the
  ///storage path.
  static CustomIncludePathsSettings findAndReadAbsolute(const QString& startPath);

  //Stores these settings exclusively, overwriting any old ones for the storage path
  bool write();
  //Deletes these settings
  bool delete_();
};

class SourcePathInformation;

///One resolution-try can issue up to 4 make-calls in worst case
class IncludePathResolver
{
  public:
    IncludePathResolver();
    ///Same as below, but uses the directory of the file as working-directory. The argument must be absolute.
    PathResolutionResult resolveIncludePath( const QString& file );
    ///The include-path is only computed once for a whole directory, then it is cached using the modification-time of the Makefile.
    PathResolutionResult resolveIncludePath( const QString& file, const QString& workingDirectory, int maxStepsUp = 20 );
    ///source and build must be absolute paths
    void setOutOfSourceBuildSystem( const QString& source, const QString& build );
    ///resets to in-source build system
    void resetOutOfSourceBuild();

    static void clearCache();

    KDevelop::ModificationRevisionSet findIncludePathDependency(const QString& file);

    void enableMakeResolution(bool enable);

  private:
    bool m_isResolving;
    bool m_outOfSource;
    bool m_enableMakeResolution;

    KUrl mapToBuild(const KUrl& url);

    ///Executes the command using KProcess
    bool executeCommand( const QString& command, const QString& workingDirectory, QString& result ) const;
    ///file should be the name of the target, without extension(because that may be different)
    PathResolutionResult resolveIncludePathInternal( const QString& file, const QString& workingDirectory,
                                                      const QString& makeParameters, const SourcePathInformation& source, int maxDepth );
    QString m_source;
    QString m_build;
};

}

#endif