#ifndef ERIS_TASK_H
#define ERIS_TASK_H

#include <sigc++/trackable.h>
#include <sigc++/signal.h>

#include <Eris/Types.h>
#include <Atlas/Message/Element.h>

namespace WFMath { class TimeDiff; }

namespace Eris
{

class View;

class Task : public sigc::trackable
{
public:
    virtual ~Task();
    
    /**
    */
    const std::string& name() const
    { return m_name; }
    
    /**
    Return the current progress of the task. Value will always be in the
    range [0..1]
    */
    double progress() const
    { return m_progress; }
    
    /**
    */
    bool isComplete() const;
    
    sigc::signal<void> Completed;
    
    sigc::signal<void> Cancelled;
    
    sigc::signal<void> Progressed;

private:
    void progressChanged();
    
    friend class View; // so it can call updateProgress
    friend class Entity; // for constructor and updateFromAtlas
    
    /**
    Create a new task owned by the specified entity
    */
    Task(Entity* owner, const std::string& nm);
    
    void updateFromAtlas(const Atlas::Message::MapType& d);
    
    /**
    Advance the progress of a constant-rate task
    */
    void updatePredictedProgress(const WFMath::TimeDiff& dt);
        
    const std::string m_name;
    Entity* m_owner;
    double m_progress;
    
    /// progress per second, or 0.0 if progress is non-linear
    double m_progressRate; 
};

}

#endif