/*
    This file is part of the KDE libraries
    SPDX-FileCopyrightText: 2020 David Faure <faure@kde.org>

    SPDX-License-Identifier: LGPL-2.0-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
*/

#ifndef KIO_APPLICATIONLAUNCHERJOB_H
#define KIO_APPLICATIONLAUNCHERJOB_H

#include "kiogui_export.h"
#include <KJob>
#include <KService>
#include <QUrl>

class ApplicationLauncherJobTest;
class KDesktopFileAction;

namespace KIO
{
class ApplicationLauncherJobPrivate;

/**
 * @class ApplicationLauncherJob applicationlauncherjob.h <KIO/ApplicationLauncherJob>
 *
 * @brief ApplicationLauncherJob runs an application and watches it while running.
 *
 * It creates a startup notification and finishes it on success or on error (for the taskbar).
 * It also emits an error message if necessary (e.g. "program not found").
 *
 * When passing multiple URLs to an application that doesn't support opening
 * multiple files, the application will be launched once for each URL.
 *
 * The job finishes when the application is successfully started. At that point you can
 * query the PID(s).
 *
 * For error handling, either connect to the result() signal, or for a simple messagebox on error,
 * you can use:
 * @code
 *    // Since 5.98 use:
 *    job->setUiDelegate(KIO::createDefaultJobUiDelegate(KJobUiDelegate::AutoHandlingEnabled, this));
 *    // For older releases use:
 *    job->setUiDelegate(new KIO::JobUiDelegate(KJobUiDelegate::AutoHandlingEnabled, this));
 * @endcode
 * Using JobUiDelegate (which is widgets based) also enables the feature of asking the user
 * in case the executable or desktop file isn't marked as executable. Otherwise the job will
 * just refuse executing such files.
 *
 * To invoke the open-with dialog (from KIOWidgets), construct an ApplicationLauncherJob without
 * any arguments or with a null KService.
 *
 * @since 5.69
 */
class KIOGUI_EXPORT ApplicationLauncherJob : public KJob
{
public:
    /**
     * Creates an ApplicationLauncherJob.
     * @param service the service (application desktop file) to run
     * @param parent the parent QObject
     */
    explicit ApplicationLauncherJob(const KService::Ptr &service, QObject *parent = nullptr);

    /**
     * Creates an ApplicationLauncherJob.
     * @param serviceAction the service action to run
     * @param parent the parent QObject
     */
    explicit ApplicationLauncherJob(const KServiceAction &serviceAction, QObject *parent = nullptr);

    /**
     * @overload
     * @since 6.0
     */
    explicit ApplicationLauncherJob(const KDesktopFileAction &desktopFileAction, QObject *parent = nullptr);

    /**
     * Creates an ApplicationLauncherJob which will prompt the user for which application to use
     * (via the open-with dialog from KIOWidgets).
     * @param parent the parent QObject
     * @since 5.71
     */
    explicit ApplicationLauncherJob(QObject *parent = nullptr);

    /**
     * Destructor
     *
     * Note that jobs auto-delete themselves after emitting result.
     * Deleting/killing the job will not stop the started application.
     */
    ~ApplicationLauncherJob() override;

    /**
     * Specifies the URLs to be passed to the application.
     * @param urls list of files (local or remote) to open
     *
     * Note that when passing multiple URLs to an application that doesn't support opening
     * multiple files, the application will be launched once for each URL.
     */
    void setUrls(const QList<QUrl> &urls);

    /**
     * @see RunFlag
     */
    enum RunFlag {
        DeleteTemporaryFiles = 0x1, ///< the URLs passed to the service will be deleted when it exits (if the URLs are local files)
    };
    /**
     * Stores a combination of #RunFlag values.
     */
    Q_DECLARE_FLAGS(RunFlags, RunFlag)

    /**
     * Specifies various flags.
     * @param runFlags the flags to be set. For instance, whether the URLs are temporary files that should be deleted after execution.
     */
    void setRunFlags(RunFlags runFlags);

    /**
     * Sets the file name to use in the case of downloading the file to a tempfile
     * in order to give to a non-URL-aware application.
     * Some apps rely on the extension to determine the MIME type of the file.
     * Usually the file name comes from the URL, but in the case of the
     * HTTP Content-Disposition header, we need to override the file name.
     * @param suggestedFileName the file name
     */
    void setSuggestedFileName(const QString &suggestedFileName);

    /**
     * Sets the platform-specific startup id of the application launch.
     * @param startupId startup id, if any (otherwise "").
     * For X11, this would be the id for the Startup Notification protocol.
     * For Wayland, this would be the token for the XDG Activation protocol.
     */
    void setStartupId(const QByteArray &startupId);

    /**
     * Starts the job.
     * You must call this, after having done all the setters.
     * This is (potentially) a GUI job, never use exec(), it would block user interaction.
     */
    void start() override;

    /**
     * @return the PID of the application that was started
     *
     * Convenience method for pids().at(0). You should only use this when specifying zero or one URL,
     * or when you are sure that the application supports opening multiple files. Otherwise use pids().
     * Available after the job emits result().
     */
    qint64 pid() const;

    /**
     * @return the PIDs of the applications that were started
     *
     * Available after the job emits result().
     */
    QList<qint64> pids() const;

private:
    friend class ::ApplicationLauncherJobTest;
    /**
     * Blocks until the process has started.
     */
    bool waitForStarted();
    KIOGUI_NO_EXPORT void emitUnauthorizedError();
    KIOGUI_NO_EXPORT void proceedAfterSecurityChecks();

    friend class ApplicationLauncherJobPrivate;
    QScopedPointer<ApplicationLauncherJobPrivate> d;
};

} // namespace KIO

#endif