#import "SDL_uikitappdelegate.h"

#import "SDL_mouse.h"

#import "CGPointUtils.h"

#pragma mark -

#pragma mark Custom SDL_UIView input handling

#define kMinimumPinchDelta      50

#define kMinimumGestureLength	10

#define kMaximumVariance        3

// we override default touch input to implement our own gestures

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

	NSArray *twoTouches;

	UITouch *touch = [touches anyObject];

	switch ([touches count]) {

		case 1:

			gestureStartPoint = [touch locationInView:self.view];

			initialDistanceForPinching = 0;

			switch ([touch tapCount]) {

				case 1:

					NSLog(@"X:%d Y:%d", (int)gestureStartPoint.x, (int)gestureStartPoint.y );

					SDL_WarpMouseInWindow([SDLUIKitDelegate sharedAppDelegate].window, 

							      (int)gestureStartPoint.y, 320 - (int)gestureStartPoint.x);

					HW_click();

					break;

				case 2:

					HW_ammoMenu();

					break;

				default:

					break;

			}

			break;

		case 2:

			if (2 == [touch tapCount]) {

				HW_zoomReset();

			}

			// pinching

			twoTouches = [touches allObjects];

			UITouch *first = [twoTouches objectAtIndex:0];

			UITouch *second = [twoTouches objectAtIndex:1];

			initialDistanceForPinching = distanceBetweenPoints([first locationInView:self.view], [second locationInView:self.view]);

			break;

		default:

			break;

	}

}

-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

	initialDistanceForPinching = 0;

	gestureStartPoint.x = 0;

	gestureStartPoint.y = 0;

	HW_allKeysUp();

}

-(void) touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {

	// this can happen if the user puts more than 5 touches on the screen at once, or perhaps in other circumstances.

	// Usually (it seems) all active touches are canceled.

	[self touchesEnded:touches withEvent:event];

}

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

	NSArray *twoTouches;

	CGPoint currentPosition;

	UITouch *touch = [touches anyObject];

	switch ([touches count]) {

		case 1:

			currentPosition = [touch locationInView:self.view];

			// panning

			SDL_WarpMouseInWindow([SDLUIKitDelegate sharedAppDelegate].window, 

							(int)gestureStartPoint.y, 320 - (int)gestureStartPoint.x);

			// remember that we have x and y inverted

			/* temporarily disabling hog movements for camera panning testing

			CGFloat vertDiff = gestureStartPoint.x - currentPosition.x;

			CGFloat horizDiff = gestureStartPoint.y - currentPosition.y;

			CGFloat deltaX = fabsf(vertDiff);

			CGFloat deltaY = fabsf(horizDiff);

			if (deltaY >= kMinimumGestureLength && deltaX <= kMaximumVariance) {

				NSLog(@"Horizontal swipe detected, begX:%f curX:%f", gestureStartPoint.x, currentPosition.x);

				if (horizDiff > 0) HW_walkLeft();

				else HW_walkRight();

			} else if (deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance){

				NSLog(@"Vertical swipe detected, begY:%f curY:%f", gestureStartPoint.y, currentPosition.y);

				if (vertDiff < 0) HW_aimUp();

				else HW_aimDown();

			}

			*/

			break;

		case 2:

			twoTouches = [touches allObjects];

			UITouch *first = [twoTouches objectAtIndex:0];

			UITouch *second = [twoTouches objectAtIndex:1];

			CGFloat currentDistanceOfPinching = distanceBetweenPoints([first locationInView:self.view], [second locationInView:self.view]);

			if (0 == initialDistanceForPinching) 

				initialDistanceForPinching = currentDistanceOfPinching;

			if (currentDistanceOfPinching < initialDistanceForPinching + kMinimumPinchDelta)

				HW_zoomOut();

			else if (currentDistanceOfPinching > initialDistanceForPinching + kMinimumPinchDelta)

				HW_zoomIn();

			currentDistanceOfPinching = initialDistanceForPinching;

			break;

		default:

			break;

	}

}