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#import "LocationPredictor.h"
#import "Framework.h"
#include "../../../base/timer.hpp"
#include "../../../map/location_state.hpp"
namespace
{
NSTimeInterval const PREDICTION_INTERVAL = 0.2; // in seconds
int const MAX_PREDICTION_COUNT = 20;
}
@implementation LocationPredictor
{
NSObject<LocationObserver> * m_observer;
NSTimer * m_timer;
location::GpsInfo m_lastGpsInfo;
bool m_gpsInfoIsValid;
int m_connectionSlot;
bool m_generatePredictions;
int m_predictionCount;
}
-(id)initWithObserver:(NSObject<LocationObserver> *)observer
{
if ((self = [super init]))
{
m_observer = observer;
m_timer = nil;
m_gpsInfoIsValid = false;
m_generatePredictions = false;
m_connectionSlot = GetFramework().GetLocationState()->AddStateModeListener([self](location::State::Mode mode)
{
m_generatePredictions = (mode == location::State::RotateAndFollow);
if (mode < location::State::NotFollow)
m_gpsInfoIsValid = false;
[self resetTimer];
});
}
return self;
}
-(void)dealloc
{
GetFramework().GetLocationState()->RemoveStateModeListener(m_connectionSlot);
}
-(void)reset:(location::GpsInfo const &)info
{
if (info.HasSpeed() && info.HasBearing())
{
m_gpsInfoIsValid = true;
m_lastGpsInfo = info;
m_lastGpsInfo.m_timestamp = my::Timer::LocalTime();
m_lastGpsInfo.m_source = location::EPredictor;
}
else
m_gpsInfoIsValid = false;
[self resetTimer];
}
-(bool)isPredict
{
return m_gpsInfoIsValid && m_generatePredictions;
}
-(void)resetTimer
{
m_predictionCount = 0;
if (m_timer != nil)
{
[m_timer invalidate];
m_timer = nil;
}
if ([self isPredict])
{
m_timer = [NSTimer scheduledTimerWithTimeInterval:PREDICTION_INTERVAL
target:self
selector:@selector(timerFired)
userInfo:nil
repeats:YES];
}
}
-(void)timerFired
{
if (![self isPredict])
return;
if (m_predictionCount < MAX_PREDICTION_COUNT)
{
++m_predictionCount;
location::GpsInfo info = m_lastGpsInfo;
info.m_timestamp = my::Timer::LocalTime();
::Framework::PredictLocation(info.m_latitude, info.m_longitude, info.m_horizontalAccuracy, info.m_bearing,
info.m_speed, info.m_timestamp - m_lastGpsInfo.m_timestamp);
[m_observer onLocationUpdate:info];
}
}
@end
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