/*
* 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 "RCTSafeAreaView.h"

#import <React/RCTBridge.h>
#import <React/RCTUIManager.h>

#import "RCTSafeAreaViewLocalData.h"

@implementation RCTSafeAreaView {
__weak RCTBridge *_bridge;
UIEdgeInsets _currentSafeAreaInsets;
}

- (instancetype)initWithBridge:(RCTBridge *)bridge
{
if (self = [super initWithFrame:CGRectZero]) {
_bridge = bridge;
}

return self;
}

RCT_NOT_IMPLEMENTED(-(instancetype)initWithCoder : (NSCoder *)decoder)
RCT_NOT_IMPLEMENTED(-(instancetype)initWithFrame : (CGRect)frame)

- (NSString *)description
{
NSString *superDescription = [super description];

// Cutting the last `>` character.
if (superDescription.length > 0 && [superDescription characterAtIndex:superDescription.length - 1] == '>') {
superDescription = [superDescription substringToIndex:superDescription.length - 1];
}

return [NSString stringWithFormat:@"%@; safeAreaInsets = %@; appliedSafeAreaInsets = %@>",
superDescription,
NSStringFromUIEdgeInsets(self.safeAreaInsets),
NSStringFromUIEdgeInsets(_currentSafeAreaInsets)];
}

static BOOL UIEdgeInsetsEqualToEdgeInsetsWithThreshold(UIEdgeInsets insets1, UIEdgeInsets insets2, CGFloat threshold)
{
return ABS(insets1.left - insets2.left) <= threshold && ABS(insets1.right - insets2.right) <= threshold &&
ABS(insets1.top - insets2.top) <= threshold && ABS(insets1.bottom - insets2.bottom) <= threshold;
}

- (void)safeAreaInsetsDidChange
{
[self setSafeAreaInsets:self.safeAreaInsets];
}

- (void)setSafeAreaInsets:(UIEdgeInsets)safeAreaInsets
{
// Relayout with different padding may result in a close but slightly different result, amplified by Yoga rounding to
// physical pixel grid. To avoid infinite relayout, allow one physical pixel of difference, along with small amount of
// extra tolerance for FP error.
CGFloat tolerance = 1.0 / RCTScreenScale() + 0.01;

if (UIEdgeInsetsEqualToEdgeInsetsWithThreshold(safeAreaInsets, _currentSafeAreaInsets, tolerance)) {
return;
}

_currentSafeAreaInsets = safeAreaInsets;

RCTSafeAreaViewLocalData *localData = [[RCTSafeAreaViewLocalData alloc] initWithInsets:safeAreaInsets];
[_bridge.uiManager setLocalData:localData forView:self];
}

@end