/* This file is part of the KDE libraries
   Copyright (C) 1998 Sven Radej <sven@lisa.exp.univie.ac.at>
   Copyright (C) 2006 Dirk Mueller <mueller@kde.org>
   Copyright (C) 2007 Flavio Castelli <flavio.castelli@gmail.com>
   Copyright (C) 2008 Rafal Rzepecki <divided.mind@gmail.com>
   Copyright (C) 2010 David Faure <faure@kde.org>
   Copyright (C) 2019 Ivailo Monev <xakepa10@laimg.moc>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include "kdirwatch.h"
#include "kdirwatch_p.h"
#include "kde_file.h"

#include <kdebug.h>
#include <QStringList>
#include <QDir>

KDirWatchPrivate::KDirWatchPrivate()
    : watcher(new QFileSystemWatcher())
{
}

KDirWatchPrivate::~KDirWatchPrivate()
{
    watcher->deleteLater();
}

Q_GLOBAL_STATIC(KDirWatch, globalWatch)

KDirWatch* KDirWatch::self()
{
  return globalWatch();
}

KDirWatch::KDirWatch (QObject* parent)
  : QObject(parent), d(new KDirWatchPrivate())
{
    connect(d->watcher, SIGNAL(directoryChanged(QString)), this, SLOT(setDirty(QString)));
    connect(d->watcher, SIGNAL(fileChanged(QString)), this, SLOT(setDirty(QString)));
}

KDirWatch::~KDirWatch()
{
    disconnect(d->watcher, SIGNAL(directoryChanged(QString)), this, SLOT(setDirty(QString)));
    disconnect(d->watcher, SIGNAL(fileChanged(QString)), this, SLOT(setDirty(QString)));
    delete d;
}

void KDirWatch::addDir(const QString& path, WatchModes watchModes)
{
    if (path.isEmpty() || path.startsWith(QLatin1String("/dev"))) {
        return; // Don't even go there.
    }

    if (watchModes & WatchDirOnly || watchModes == WatchDirOnly) {
        d->watcher->addPath(path);
        return;
    }

    kDebug(7001) << "listing" << path << watchModes;
    QDir::Filters filters = QDir::NoDotAndDotDot;
    if (watchModes & WatchFiles) {
        filters |= QDir::Files;
    }
    if (watchModes & WatchSubDirs) {
        filters |= QDir::Dirs;
    }
    QDir dir(path);
    if (!dir.exists()) {
        // try to watch the parent directory
        dir.cdUp();
    }

    foreach(const QFileInfo info, dir.entryInfoList(filters)) {
        const QString fullpath = info.absoluteFilePath();
        if (info.isDir()) {
            addDir(fullpath, watchModes);
        } else {
            d->watcher->addPath(fullpath);
        }
    }
}

void KDirWatch::addFile(const QString& path)
{
    if (path.isEmpty() || path.startsWith(QLatin1String("/dev"))) {
        return; // Don't even go there.
    } else if (d->watcher->files().contains(path)) {
        return;
    }

    QFileInfo info(path);
    if (!info.exists() && !info.isDir()) {
        // try to watch the parent directory
        d->watcher->addPath(info.path());
        return;
    }
    d->watcher->addPath(path);
}

void KDirWatch::removeDir(const QString& path)
{
    d->watcher->removePath(path);
}

void KDirWatch::removeFile(const QString &path)
{
    d->watcher->removePath(path);
}

bool KDirWatch::contains(const QString &path) const
{
    return (d->watcher->files().contains(path) || d->watcher->directories().contains(path));
}

void KDirWatch::setCreated(const QString &file)
{
    kDebug(7001) << objectName() << "emitting created" << file;
    emit created(file);
}

void KDirWatch::setDirty(const QString &file)
{
    kDebug(7001) << objectName() << "emitting dirty" << file;
    emit dirty(file);
    // a simple solution for a complex problem - KConfig requires proper created/deleted events
    // notification because INI backend uses KSaveFile which moves (renames) backup to original
    // file but currently there is not. the proper solution is to watch exisiting configuration
    // directories for changes (and future creation of such) and emit signals for file events
    KDE_struct_stat statbuf;
    if (KDE::stat(file, &statbuf) == 0 && S_ISREG(statbuf.st_mode)) {
        addFile(file);
    }
}

void KDirWatch::setDeleted(const QString &file)
{
    kDebug(7001) << objectName() << "emitting deleted" << file;
    emit deleted(file);
}

#include "moc_kdirwatch.cpp"

//sven