/****************************************************************************
** Copyright (C) 2001-2010 Klaralvdalens Datakonsult AB.  All rights reserved.
**
** This file is part of the KD Tools library.
**
** Licensees holding valid commercial KD Tools licenses may use this file in
** accordance with the KD Tools Commercial License Agreement provided with
** the Software.
**
**
** This file may be distributed and/or modified under the terms of the
** GNU Lesser General Public License version 2 and version 3 as published by the
** Free Software Foundation and appearing in the file LICENSE.LGPL included.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Contact info@kdab.com if any conditions of this licensing are not
** clear to you.
**
**********************************************************************/

#include "kdrunoncechecker.h"
#include "kdlockfile.h"
#include "kdsysinfo.h"

#include <QtCore/QList>
#include <QtCore/QCoreApplication>
#include <QtCore/QDir>
#include <QtCore/QFileInfo>

#include <algorithm>

using namespace KDUpdater;

class KDRunOnceChecker::Private
{
public:
    Private(const QString &filename);

    KDLockFile m_lockfile;
    bool m_hasLock;
};

KDRunOnceChecker::Private::Private(const QString &filename)
    : m_lockfile(filename)
    , m_hasLock(false)
{}

KDRunOnceChecker::KDRunOnceChecker(const QString &filename)
    :d(new Private(filename))
{}

KDRunOnceChecker::~KDRunOnceChecker()
{
    delete d;
}

class ProcessnameEquals
{
public:
    ProcessnameEquals(const QString &name): m_name(name) {}

    bool operator()(const ProcessInfo &info)
    {
#ifndef Q_OS_WIN
        if (info.name == m_name)
            return true;
        const QFileInfo fi(info.name);
        if (fi.fileName() == m_name || fi.baseName() == m_name)
            return true;
        return false;
#else
        if (info.name.toLower() == m_name.toLower())
            return true;
        if (info.name.toLower() == QDir::toNativeSeparators(m_name.toLower()))
            return true;
        const QFileInfo fi(info.name);
        if (fi.fileName().toLower() == m_name.toLower() || fi.baseName().toLower() == m_name.toLower())
            return true;
        return info.name == m_name;
#endif
    }

private:
    QString m_name;
};

bool KDRunOnceChecker::isRunning(Dependencies depends)
{
    bool running = false;
    switch (depends) {
        case Lockfile: {
            const bool locked = d->m_hasLock || d->m_lockfile.lock();
            if (locked)
                d->m_hasLock = true;
            running = running || ! locked;
        }
        break;
        case ProcessList: {
            const QList<ProcessInfo> allProcesses = runningProcesses();
            const QString appName = qApp->applicationFilePath();
            //QList< ProcessInfo >::const_iterator it = std::find_if(allProcesses.constBegin(), allProcesses.constEnd(), ProcessnameEquals(appName));
            const int count = std::count_if(allProcesses.constBegin(), allProcesses.constEnd(), ProcessnameEquals(appName));
            running = running || /*it != allProcesses.constEnd()*/count > 1;
        }
        break;
        case Both: {
            const QList<ProcessInfo> allProcesses = runningProcesses();
            const QString appName = qApp->applicationFilePath();
            //QList<ProcessInfo>::const_iterator it = std::find_if(allProcesses.constBegin(), allProcesses.constEnd(), ProcessnameEquals(appName));
            const int count = std::count_if(allProcesses.constBegin(), allProcesses.constEnd(), ProcessnameEquals(appName));
            const bool locked = d->m_hasLock || d->m_lockfile.lock();
            if (locked)
                d->m_hasLock = true;
            running = running || ( /*it != allProcesses.constEnd()*/count > 1 && !locked);
        }
        break;
    }

    return running;
}