VoidLink/Limelight/ViewControllers/HostCollectionViewController.m

//
//  HostCollectionViewController.m
//  Voidex
//
//  Created by True砖家 on 2025/5/28.
//  Copyright 2025 True砖家 @ Bilibili. All rights reserved.
//

#import "HostCollectionViewController.h"
#import "HostCardView.h"
#import "TemporaryHost.h"
#import "ThemeManager.h"

static const CGFloat cellOffsetY = 20;

@implementation HostCell {
    UIViewController* parentVC;
}

- (void)prepareForReuse {
    [super prepareForReuse];
    [self.cardView removeFromSuperview];
    self.cardView = nil;
}

- (CGFloat)getHostCardSizeFactor{
    TemporaryHost* dummyHost = [[TemporaryHost alloc] init];
    HostCardView* dummyCard = [[HostCardView alloc] initWithHost:dummyHost];
    return self.contentView.bounds.size.height/dummyCard.size.height;
}

- (UIViewController *)viewController {
    UIResponder *responder = self;
    while (responder) {
        if ([responder isKindOfClass:[UIViewController class]]) {
            return (UIViewController *)responder;
        }
        responder = responder.nextResponder;
    }
    return nil;
}

- (void)assignDelegateForHostCard{
    parentVC = [self viewController].parentViewController;
    if(parentVC != nil){
        if([parentVC conformsToProtocol:@protocol(HostCardActionDelegate)]) self.cardView.delegate = (id<HostCardActionDelegate>) parentVC;
    }
}

- (void)didMoveToWindow {
    [super didMoveToWindow];
    [self assignDelegateForHostCard];
}

- (void)configureWithHost:(TemporaryHost *)host {
    if (!self.cardView) {
        self.cardView = [[HostCardView alloc] initWithHost:host andSizeFactor:[self getHostCardSizeFactor]];
        [self assignDelegateForHostCard];
        [self.contentView addSubview:self.cardView];
        [NSLayoutConstraint activateConstraints:@[
            [self.cardView.leadingAnchor constraintEqualToAnchor:self.contentView.leadingAnchor],
            [self.cardView.topAnchor constraintEqualToAnchor:self.contentView.topAnchor constant:0],
        ]];
    }
}

@end

@interface HostCollectionViewController () <UICollectionViewDelegateFlowLayout>
@property (nonatomic, strong, readwrite) NSMutableArray<TemporaryHost *> *items;
@property (nonatomic, strong) NSLayoutConstraint *collectionViewHeightConstraint;
@end

@implementation HostCollectionViewController{
    UICollectionViewFlowLayout *layout;
    CGFloat _horizontalPadding;
}

- (instancetype)init {
    layout = [[UICollectionViewFlowLayout alloc] init];
    switch ([UIDevice currentDevice].userInterfaceIdiom) {
        case UIUserInterfaceIdiomPhone:
            _horizontalPadding = 5;
            break;
        case UIUserInterfaceIdiomPad:
        default:
            _horizontalPadding = 75;
            break;
    }
    layout.sectionInset = UIEdgeInsetsMake(7, _horizontalPadding, 0, _horizontalPadding); // 上、左、下、右的间距
    if (self = [super initWithCollectionViewLayout:layout]) {
        _interItemMinimumSpacing = 10;
        _minimumLineSpacing = 10;
        // _cellSize = CGSizeMake(100, 100);
        _items = [NSMutableArray array];

        _collectionViewHeightConstraint = [self.collectionView.heightAnchor constraintEqualToConstant:50];
        _collectionViewHeightConstraint.active = YES;
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.collectionView registerClass:[HostCell class] forCellWithReuseIdentifier:@"HostCell"];
    self.collectionView.alwaysBounceVertical = NO;
    self.collectionView.showsVerticalScrollIndicator = NO;
    self.collectionView.backgroundColor = [ThemeManager appBackgroundColor];

}


#pragma mark - Data control

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    NSLog(@"View did appear");
}

- (void)didMoveToParentViewController:(UIViewController *)parent {
    [super didMoveToParentViewController:parent];
    NSLog(@"moved to parentVC: %@", parent);
    // 可以在这里进行一些初始化，比如加载数据、刷新 UI 等
}

- (void)addHost:(TemporaryHost *)host {
    if(![self.items containsObject:host]){
        [self.items addObject:host];
        [self.items addObject:host];
        [self.items addObject:host];
        [self.items addObject:host];
        [self.collectionView reloadData];
        // [self.view layoutIfNeeded];
    }
    NSLog(@"addhost log");
}

- (void)removeHost:(TemporaryHost *)host {
    if([self.items containsObject:host]){
        [self.items removeObject:host];
        [self.collectionView reloadData];
    }
}


- (void)removeLastItem {
    if (self.items.count > 0) {
        [self.items removeLastObject];
        [self.collectionView reloadData];
    }
}

- (NSInteger)numberOfRowsInCollectionView{
    NSInteger itemCount = [self.collectionView numberOfItemsInSection:0];
    
    if (itemCount == 0) return 0;
    
    NSMutableSet<NSNumber *> *rowYs = [NSMutableSet set];
    for (NSInteger i = 0; i < itemCount; i++) {
        NSIndexPath *indexPath = [NSIndexPath indexPathForItem:i inSection:0];
        UICollectionViewLayoutAttributes *attr = [layout layoutAttributesForItemAtIndexPath:indexPath];
        if (attr) {
            CGFloat y = CGRectGetMinY(attr.frame);
            [rowYs addObject:@(round(y))]; // round 防止浮点误差
        }
    }
    
    return rowYs.count;
}

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];

    CGFloat contentHeight = self.collectionView.collectionViewLayout.collectionViewContentSize.height;
    bool contentExceedsView = contentHeight > self.view.superview.bounds.size.height - self.view.frame.origin.y;
    if(contentExceedsView){
        [NSLayoutConstraint activateConstraints:@[
            [self.view.bottomAnchor constraintEqualToAnchor:self.view.superview.safeAreaLayoutGuide.bottomAnchor constant:0]
        ]];
    }
    else{
        _collectionViewHeightConstraint.constant = contentHeight;
    }
    
    if([self numberOfRowsInCollectionView]<=2 && !contentExceedsView) layout.sectionInset = UIEdgeInsetsMake(50, _horizontalPadding, 0, _horizontalPadding);
    if([self numberOfRowsInCollectionView]>2 && !contentExceedsView) layout.sectionInset = UIEdgeInsetsMake(25, _horizontalPadding, 0, _horizontalPadding);
    if(contentExceedsView) layout.sectionInset = UIEdgeInsetsMake(7, _horizontalPadding, 0, _horizontalPadding);
}

#pragma mark - UICollectionView DataSource

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.items.count;
}

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"config cell log");

    HostCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"HostCell" forIndexPath:indexPath];
    TemporaryHost *host = self.items[indexPath.item];
    [cell configureWithHost:host];
    return cell;
}

#pragma mark - UICollectionViewDelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView
                  layout:(UICollectionViewLayout *)collectionViewLayout
  sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"return cellsize: %f, %f", self.cellSize.width, self.cellSize.height);
    return self.cellSize;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView
                   layout:(UICollectionViewLayout *)collectionViewLayout
minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
    NSLog(@"return iterIterm: %f", self.interItemMinimumSpacing);

    return self.interItemMinimumSpacing;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView
                   layout:(UICollectionViewLayout *)collectionViewLayout
minimumLineSpacingForSectionAtIndex:(NSInteger)section {
    return self.minimumLineSpacing;
}

@end