/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/

#import "RCTScrollEvent.h"
#import <React/RCTAssert.h>

@implementation RCTScrollEvent {
CGPoint _scrollViewContentOffset;
UIEdgeInsets _scrollViewContentInset;
CGSize _scrollViewContentSize;
CGRect _scrollViewFrame;
CGFloat _scrollViewZoomScale;
NSDictionary *_userData;
uint16_t _coalescingKey;
}

@synthesize viewTag = _viewTag;
@synthesize eventName = _eventName;

- (instancetype)initWithEventName:(NSString *)eventName
reactTag:(NSNumber *)reactTag
scrollViewContentOffset:(CGPoint)scrollViewContentOffset
scrollViewContentInset:(UIEdgeInsets)scrollViewContentInset
scrollViewContentSize:(CGSize)scrollViewContentSize
scrollViewFrame:(CGRect)scrollViewFrame
scrollViewZoomScale:(CGFloat)scrollViewZoomScale
userData:(NSDictionary *)userData
coalescingKey:(uint16_t)coalescingKey
{
RCTAssertParam(reactTag);

if ((self = [super init])) {
_eventName = [eventName copy];
_viewTag = reactTag;
_scrollViewContentOffset = scrollViewContentOffset;
_scrollViewContentInset = scrollViewContentInset;
_scrollViewContentSize = scrollViewContentSize;
_scrollViewFrame = scrollViewFrame;
_scrollViewZoomScale = scrollViewZoomScale;
_userData = userData;
_coalescingKey = coalescingKey;
}
return self;
}

RCT_NOT_IMPLEMENTED(-(instancetype)init)

- (uint16_t)coalescingKey
{
return _coalescingKey;
}

- (NSDictionary *)body
{
NSDictionary *body = @{
@"contentOffset" : @{@"x" : @(_scrollViewContentOffset.x), @"y" : @(_scrollViewContentOffset.y)},
@"contentInset" : @{
@"top" : @(_scrollViewContentInset.top),
@"left" : @(_scrollViewContentInset.left),
@"bottom" : @(_scrollViewContentInset.bottom),
@"right" : @(_scrollViewContentInset.right)
},
@"contentSize" : @{@"width" : @(_scrollViewContentSize.width), @"height" : @(_scrollViewContentSize.height)},
@"layoutMeasurement" : @{@"width" : @(_scrollViewFrame.size.width), @"height" : @(_scrollViewFrame.size.height)},
@"zoomScale" : @(_scrollViewZoomScale ?: 1),
};

if (_userData) {
NSMutableDictionary *mutableBody = [body mutableCopy];
[mutableBody addEntriesFromDictionary:_userData];
body = mutableBody;
}

return body;
}

- (BOOL)canCoalesce
{
return YES;
}

- (RCTScrollEvent *)coalesceWithEvent:(RCTScrollEvent *)newEvent
{
NSArray<NSDictionary *> *updatedChildFrames =
[_userData[@"updatedChildFrames"] arrayByAddingObjectsFromArray:newEvent->_userData[@"updatedChildFrames"]];
if (updatedChildFrames) {
NSMutableDictionary *userData = [newEvent->_userData mutableCopy];
userData[@"updatedChildFrames"] = updatedChildFrames;
newEvent->_userData = userData;
}

return newEvent;
}

+ (NSString *)moduleDotMethod
{
return @"RCTEventEmitter.receiveEvent";
}

- (NSArray *)arguments
{
return @[ self.viewTag, RCTNormalizeInputEventName(self.eventName), [self body] ];
}

@end