/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** No Commercial Usage
**
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU Lesser
** 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
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
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**************************************************************************/

#include "qmlobservertool.h"

#include "qt4project.h"
#include "qt4projectmanagerconstants.h"
#include <coreplugin/icore.h>
#include <utils/qtcassert.h>

#include <projectexplorer/project.h>
#include <QDesktopServices>
#include <QCoreApplication>
#include <QDir>
#include <QDebug>

namespace Qt4ProjectManager {

static inline QStringList validBinaryFilenames()
{
    return QStringList()
            << QLatin1String("debug/qmlobserver.exe")
            << QLatin1String("qmlobserver.exe")
            << QLatin1String("qmlobserver")
            << QLatin1String("QMLObserver.app/Contents/MacOS/QMLObserver");
}

bool QmlObserverTool::canBuild(const QtVersion *qtVersion)
{
    return (qtVersion->supportsTargetId(Constants::DESKTOP_TARGET_ID)
            || qtVersion->supportsTargetId(Constants::QT_SIMULATOR_TARGET_ID))
            && checkMinimumQtVersion(qtVersion->qtVersionString(), 4, 7, 1);
}

QString QmlObserverTool::toolForProject(ProjectExplorer::Project *project)
{
    if (project->id() == Qt4ProjectManager::Constants::QT4PROJECT_ID) {
        Qt4Project *qt4Project = static_cast<Qt4Project*>(project);
        if (qt4Project && qt4Project->activeTarget()
         && qt4Project->activeTarget()->activeBuildConfiguration()) {
            QtVersion *version = qt4Project->activeTarget()->activeBuildConfiguration()->qtVersion();
            if (version->isValid()) {
                QString qtInstallData = version->versionInfo().value("QT_INSTALL_DATA");
                QString toolPath = toolByInstallData(qtInstallData);
                return toolPath;
            }
        }
    }
    return QString();
}

QString QmlObserverTool::toolByInstallData(const QString &qtInstallData)
{
    if (!Core::ICore::instance())
        return QString();

    const QString mainFilename = Core::ICore::instance()->resourcePath()
            + QLatin1String("/qml/qmlobserver/main.cpp");
    const QStringList directories = installDirectories(qtInstallData);
    const QStringList binFilenames = validBinaryFilenames();

    return byInstallDataHelper(mainFilename, directories, binFilenames);
}

QStringList QmlObserverTool::locationsByInstallData(const QString &qtInstallData)
{
    QStringList result;
    QFileInfo fileInfo;
    const QStringList binFilenames = validBinaryFilenames();
    foreach(const QString &directory, installDirectories(qtInstallData)) {
        if (getHelperFileInfoFor(binFilenames, directory, &fileInfo))
            result << fileInfo.filePath();
    }
    return result;
}

bool  QmlObserverTool::build(const QString &directory, const QString &makeCommand,
                             const QString &qmakeCommand, const QString &mkspec,
                             const Utils::Environment &env, const QString &targetMode,
                             QString *output,  QString *errorMessage)
{
    return buildHelper(QCoreApplication::translate("Qt4ProjectManager::QmlObserverTool", "QMLObserver"),
                       QLatin1String("qmlobserver.pro"),
                       directory, makeCommand, qmakeCommand, mkspec, env, targetMode,
                       output, errorMessage);
}

static inline bool mkpath(const QString &targetDirectory, QString *errorMessage)
{
    if (!QDir().mkpath(targetDirectory)) {
        *errorMessage = QCoreApplication::translate("ProjectExplorer::QmlObserverTool", "The target directory %1 could not be created.").arg(targetDirectory);
        return false;
    }
    return true;
}

QString QmlObserverTool::copy(const QString &qtInstallData, QString *errorMessage)
{
    const QStringList directories = QmlObserverTool::installDirectories(qtInstallData);

    QString sourcePath = Core::ICore::instance()->resourcePath() + QLatin1String("/qml/qmlobserver/");
    QString libSourcePath = Core::ICore::instance()->resourcePath() + QLatin1String("/qml/qmljsdebugger/");

    QStringList observerFiles = recursiveFileList(QDir(sourcePath));
    QStringList qmljsDebuggerFiles = recursiveFileList(QDir(libSourcePath));

    // Try to find a writeable directory.
    foreach(const QString &directory, directories) {
        if (!mkpath(directory, errorMessage)) {
            continue;
        } else {
            errorMessage->clear();
        }

        if (copyFiles(sourcePath, observerFiles, directory, errorMessage)
                && copyFiles(libSourcePath, qmljsDebuggerFiles,
                             directory + QLatin1String("/qmljsdebugger/"), errorMessage))
        {
            errorMessage->clear();
            return directory;
        }
    }
    *errorMessage = QCoreApplication::translate("ProjectExplorer::QmlObserverTool",
                                                "QMLObserver could not be built in any of the directories:\n- %1\n\nReason: %2")
                    .arg(directories.join(QLatin1String("\n- ")), *errorMessage);
    return QString();
}

QStringList QmlObserverTool::recursiveFileList(const QDir &dir, const QString &prefix)
{
    QStringList files;

    QString _prefix = prefix;
    if (!_prefix.isEmpty() && !_prefix.endsWith('/')) {
        _prefix = _prefix + '/';
    }
    foreach (const QString &fileName, dir.entryList(QDir::Files)) {
        files << _prefix + fileName;
    }

    foreach (const QString &subDir, dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot)) {
        files += recursiveFileList(QDir(dir.absoluteFilePath(subDir)), _prefix + subDir);
    }
    return files;
}

QStringList QmlObserverTool::installDirectories(const QString &qtInstallData)
{
    const QChar slash = QLatin1Char('/');
    const uint hash = qHash(qtInstallData);
    QStringList directories;
    directories
            << (qtInstallData + QLatin1String("/qtc-qmlobserver/"))
            << QDir::cleanPath((QCoreApplication::applicationDirPath() + QLatin1String("/../qtc-qmlobserver/") + QString::number(hash))) + slash
            << (QDesktopServices::storageLocation(QDesktopServices::DataLocation) + QLatin1String("/qtc-qmlobserver/") + QString::number(hash)) + slash;
    return directories;
}

} // namespace