#pragma once 

#include <QRunnable>
#include <QVector>

/** Base class for an object that can be queued for execution in the background.
 * 
 * It is meaned for long running processes the end user might want to abort, pause and check progress on.
 */
class QueuedBackgroundTask: public QRunnable
{
    /** Task should exit it's run method but remember it's state, it might be resumed later.
     */
    void requestPause();
    
    /** Request to stop running and forget progress
     */
    void requestAbort();
    
    QString getProgressInfo();
};

class BackgroundTaskInfo {
public:   
};

/** Manages objects of type QueuedBackgroundTask
 * 
 * The basic operation of this queue is hand everything directly of to the default
 * threadpool and that will decide when to run each task. But extra functions are 
 * provided to control tasks to allow the program to have a UI for controlling the tasks
 */
class BackgroundTaskQueue {
    
public:
    
    /** Returns a list of tasks in the queue and their progress.
     * 
     * When building a UI to show realtime activity then make sure to first register the update events
     * then get the snapshot. After that you can use the events to update the contents of the UI.
     */
    QVector<BackgroundTaskInfo> getTaskInfoSnapshort();
    
    void pauseTask( );
    
    /** Resume a paused task
     */
    void resumeTask( );
    
    void abortTask( );
    
};