//
//  SDCycleScrollView.m
//  SDCycleScrollView
//
//  Created by aier on 15-3-22.
//  Copyright (c) 2015年 GSD. All rights reserved.
//

/**
 
 *******************************************************
 *                                                      *
 * 感谢您的支持， 如果下载的代码在使用过程中出现BUG或者其他问题    *
 * 您可以发邮件到gsdios@126.com 或者 到                       *
 * https://github.com/gsdios?tab=repositories 提交问题     *
 *                                                      *
 *******************************************************
 
 */

#import "SDCycleScrollView2.h"
#import "SDCollectionViewCell.h"
#import "UIView+SDExtension.h"
#import "TAPageControl.h"
//#import "NSData+SDDataCache.h"

#define kRepeatCount    1 // 循环次数

NSString * const MYID = @"cycleCell2";

@interface SDCycleScrollView2 () <UICollectionViewDataSource, UICollectionViewDelegate>

@property (nonatomic, weak) UICollectionView *mainView; // 显示图片的collectionView
@property (nonatomic, weak) UICollectionViewFlowLayout *flowLayout;
@property (nonatomic, strong) NSMutableArray *imagesGroup;
@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, assign) NSInteger totalItemsCount;
@property (nonatomic, weak) TAPageControl *pageControl;

@end

@implementation SDCycleScrollView2


- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        [self initialization];
        [self setupMainView];
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder]) {
        [self initialization];
        [self setupMainView];
    }
    return self;
}

- (void)initialization
{
    _pageControlAliment = SDCycleScrollViewPageContolAlimentCenter;
    _autoScrollTimeInterval = 1.0;
    _titleLabelTextColor = [UIColor whiteColor];
    _titleLabelTextFont= [UIFont systemFontOfSize:14];
    _titleLabelBackgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];
    _titleLabelHeight = 30;
    self.backgroundColor = [UIColor clearColor];
}

+ (instancetype)cycleScrollViewWithFrame:(CGRect)frame imagesGroup:(NSArray *)imagesGroup
{
    SDCycleScrollView2 *cycleScrollView = [[self alloc] initWithFrame:frame];
    cycleScrollView.imagesGroup = [NSMutableArray arrayWithArray:imagesGroup];
    return cycleScrollView;
}

+ (instancetype)cycleScrollViewWithFrame:(CGRect)frame imageURLsGroup:(NSArray *)imageURLsGroup
{
    SDCycleScrollView2 *cycleScrollView = [[self alloc] initWithFrame:frame];
    cycleScrollView.imageURLsGroup = [NSMutableArray arrayWithArray:imageURLsGroup];
    return cycleScrollView;
}

- (void)setFrame:(CGRect)frame
{
    [super setFrame:frame];
    
    _flowLayout.itemSize = self.frame.size;
}

- (void)setPageControlDotSize:(CGSize)pageControlDotSize
{
    _pageControlDotSize = pageControlDotSize;
    _pageControl.dotSize = pageControlDotSize;
}

- (void)setDotColor:(UIColor *)dotColor
{
    _dotColor = dotColor;
    _pageControl.dotColor = dotColor;
}

- (void)setAutoScrollTimeInterval:(CGFloat)autoScrollTimeInterval
{
    _autoScrollTimeInterval = autoScrollTimeInterval;
    
    [_timer invalidate];
    _timer = nil;
}

// 设置显示图片的collectionView
- (void)setupMainView
{
    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
    flowLayout.itemSize = self.frame.size;
    flowLayout.minimumLineSpacing = 0;
    flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
    _flowLayout = flowLayout;
    
    UICollectionView *mainView = [[UICollectionView alloc] initWithFrame:self.frame collectionViewLayout:flowLayout];
    mainView.backgroundColor = [UIColor clearColor];
    mainView.pagingEnabled = YES;
    mainView.showsHorizontalScrollIndicator = NO;
    mainView.showsVerticalScrollIndicator = NO;
    mainView.bounces = NO;
    [mainView registerClass:[SDCollectionViewCell class] forCellWithReuseIdentifier:MYID];
    mainView.dataSource = self;
    mainView.delegate = self;
    [self addSubview:mainView];
    _mainView = mainView;
}

- (void)setImagesGroup:(NSMutableArray *)imagesGroup
{
    if ([imagesGroup count]>0) {
        _imagesGroup = imagesGroup;
        _totalItemsCount = imagesGroup.count * kRepeatCount;
        
        [self setupPageControl];
    }
    
}

- (void)setupPageControl
{
    if ([_imagesGroup count]>1)
    {
        if (_pageControl) [_pageControl removeFromSuperview];//重新加载数据时调整
        TAPageControl *pageControl = [[TAPageControl alloc] init];
        pageControl.numberOfPages = self.imagesGroup.count;
        [self addSubview:pageControl];
        _pageControl = pageControl;
    }
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    if ([_imagesGroup count]>1) {
        _mainView.frame = self.bounds;
//        if (_mainView.contentOffset.x == 0 &&  _totalItemsCount) {
//            [_mainView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:_totalItemsCount * 0.5 inSection:0] atScrollPosition:UICollectionViewScrollPositionNone animated:NO];
//        }
        
        CGSize size = [_pageControl sizeForNumberOfPages:self.imagesGroup.count];
        CGFloat x = (self.sd_width - size.width) * 0.5;
        if (self.pageControlAliment == SDCycleScrollViewPageContolAlimentRight) {
            x = self.mainView.sd_width - size.width - 10;
        }
        CGFloat y = self.mainView.sd_height - size.height - 10;
        _pageControl.frame = CGRectMake(x, y, size.width, size.height);
        [_pageControl sizeToFit];
    }
    
}
//解决当父View释放时，当前视图因为被Timer强引用而不能释放的问题
- (void)willMoveToSuperview:(UIView *)newSuperview
{
    if (!newSuperview) {
        [_timer invalidate];
        _timer = nil;
    }
}

#pragma mark - UICollectionViewDataSource

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return _totalItemsCount;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    SDCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:MYID forIndexPath:indexPath];
    for (UIView *view in cell.subviews) {
        if (view) {
            [view removeFromSuperview];
        }
    }
    
    long itemIndex = indexPath.item % self.imagesGroup.count;
    [cell addSubview:self.imagesGroup[itemIndex]];
    
    if (!cell.hasConfigured) {
        cell.titleLabelBackgroundColor = self.titleLabelBackgroundColor;
        cell.titleLabelHeight = self.titleLabelHeight;
        cell.titleLabelTextColor = self.titleLabelTextColor;
        cell.titleLabelTextFont = self.titleLabelTextFont;
        cell.hasConfigured = YES;
    }
    
    return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    if ([self.delegate respondsToSelector:@selector(cycleScrollView:didSelectItemAtIndex:)]) {
        [self.delegate cycleScrollView:self didSelectItemAtIndex:indexPath.item % self.imagesGroup.count];
    }
}


#pragma mark - UIScrollViewDelegate

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if ([_imagesGroup count]>1) {
        int itemIndex = (scrollView.contentOffset.x + self.mainView.sd_width * 0.5) / self.mainView.sd_width;
        if (!self.imagesGroup.count) return; // 解决清除timer时偶尔会出现的问题
        int indexOnPageControl = itemIndex % self.imagesGroup.count;
        _pageControl.currentPage = indexOnPageControl;
    }
    
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    [_timer invalidate];
    _timer = nil;
}

@end