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#ifndef TIMER_HH

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#define TIMER_HH

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#include <ClanLib/core.h>

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/**

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 * A time interval, measured in real milliseconds

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 */

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typedef unsigned long TimeMS;

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/**

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 * Abstract tick count, defined as a number of Timer::interval's against real time

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 */

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typedef uint32_t TickCount;

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/**

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 * Used to implement Physics ticks and Graphics frames. This will attempt to trigger sig_tick every <interval> ms,

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 * but if we miss some ticks or something else, then the tick_length passed to sig_tick will be longer than interval...

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 */

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class Timer : public CL_KeepAlive {

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    protected:

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        // the target tick interval

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        TimeMS interval;

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        // number of ticks

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        TickCount ticks;

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        bool enabled;

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        // time of last tick

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        TimeMS last_tick;

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        CL_Signal_v1<TimeMS> _sig_tick;

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    public:

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        /*

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         * Interval is in milliseconds

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         */

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        Timer (TimeMS interval);

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        /*

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         * Returns the tick counter

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         */

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        TickCount get_ticks (void);

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        /*

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         * Start the timer, this should be called once keepalive starts getting called

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         */

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        void start (void);

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    private:

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        void keep_alive (void);

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    public:

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        CL_Signal_v1<TimeMS>& sig_tick (void) { return _sig_tick; }

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};

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#endif