//
//  ImageScrollerView.m
//  RedAnt ERP Mobile
//
//  Created by Ray on 12/18/15.
//  Copyright © 2015 United Software Applications, Inc. All rights reserved.
//

#import "ImageScrollerView.h"


#import "FileCache.h"
#pragma mark -定义宏常量
#define kImgViewCount 3

#define kImgZoomScaleMin 1
#define kImgZoomScaleMax 3

#pragma mark -定义展示板
#define kImgVLeft (UIImageView *)[_imgViewDic valueForKey:@"imgLeft"];
#define kImgVCenter (UIImageView *)[_imgViewDic valueForKey:@"imgCenter"];
#define kImgVRight (UIImageView *)[_imgViewDic valueForKey:@"imgRight"];
@implementation ImageScrollerView
{
    UIScrollView *_scrCenter;
}

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

- (id)initWithFrame:(CGRect)frame withSourceData:(NSMutableArray *)imgSource withIndex:(NSInteger)index{
    
    self = [super initWithFrame:frame];
    if (self) {
        
        // 初始化控件属性
        [self initScrollView];
        
        // 设置数据源
        [self setImgSource:imgSource];
        
        // 设置图片下标
        [self setCurIndex:(int)index];
        
        
    }
    return self;
}
- (id)initWithFrame:(CGRect)frame withSourceURL:(NSMutableArray *)imgURL withIndex:(NSInteger)index
{
    self = [super initWithFrame:frame];
    if (self) {
        
        NSMutableArray* data = [[NSMutableArray alloc]init];
        for(int i=0;i<imgURL.count;i++)
        {
            NSString* img_url = imgURL[i];
            NSString* file_name=[img_url lastPathComponent];
            NSData* img_data=[FileCache load_cached_img:file_name loadFrom:img_url];
            if(img_data!=nil)
            {
                dispatch_async(dispatch_get_main_queue(), ^{
                    UIImage * img =[UIImage imageWithData:img_data];
                    [data addObject:img];
                    
                    
                    //                if(i==count-1)
                    //                {
                    //
                    //                }
                    //                        if(i==0)
                    //                        cell.imageView.image = img;
                });
            }
            else
            {
                NSData*  downloadimg_data = [NSData dataWithContentsOfURL:[NSURL URLWithString:img_url]];
                dispatch_async(dispatch_get_main_queue(), ^{
                    
                    
                    
                    if(downloadimg_data!=nil)
                    {
                        
                        [FileCache cache_img:downloadimg_data filename:file_name saveTo:img_url];
                        
                        UIImage * img =[UIImage imageWithData:downloadimg_data];
                        [data addObject:img];
                        
                        //                    if(i==count-1)
                        //                    {
                        //                        UIImage* qrimg=[QRCodeGenerator qrImageForString:[section_json valueForKey:@"model_name"] imageSize:350];
                        //                        if(qrimg!=nil)
                        //                            [cell AddPhoto:qrimg];
                        //                    }
                        //                            if(i==0)
                        //                                cell.imageView.image = img;
                    }
                    else
                    {
                        
                        
                        UIImage * img =[UIImage imageNamed:@"notfound_l"];
                        [data addObject:img];
                        
                        //                    if(i==count-1)
                        //                    {
                        //                        UIImage* qrimg=[QRCodeGenerator qrImageForString:[section_json valueForKey:@"model_name"] imageSize:350];
                        //                        if(qrimg!=nil)
                        //                            [cell AddPhoto:qrimg];
                        //                    }
                        //                            if(i==0)
                        //                                cell.imageView.image = img;
                    }
                    
                });
            }
        }
        
        // 初始化控件属性
        [self initScrollView];
        
        // 设置数据源
        [self setImgSource:data];
        
        // 设置图片下标
        [self setCurIndex:(int)index];
        
        
    }
    return self;
}
#pragma mark -初始化控件
- (void)initScrollView{
    
    // 设置代理
    self.delegate = self;
    
    // 不显示滚动条
    self.showsHorizontalScrollIndicator = NO;
    self.showsVerticalScrollIndicator = NO;
    
    // 设置分页显示
    self.pagingEnabled = YES;
    
    //设置背景颜色
    self.backgroundColor = [UIColor clearColor];
    
    // 构建展示组
    [self initImgViewDic];
}

// 通过创建展示板
- (UIImageView *)creatImageView{
    
    CGFloat width = self.frame.size.width;
    CGFloat height = self.frame.size.height;
    
    UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, width, height)];
    imgView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
    imgView.backgroundColor= [UIColor whiteColor];
    return imgView;
}

// 通过位置创建展示板
- (UIScrollView *)scrollViewWithPosition:(MRImgLocation)imgLocation withImgView:(UIImageView *)imgView{
    
    CGFloat width = self.frame.size.width;
    CGFloat height = self.frame.size.height;
    
    UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(width * imgLocation, 0, width, height)];
    
    scrollView.backgroundColor = [UIColor clearColor];
    
    [scrollView addSubview:imgView];
    
    // 设置图片显示样式
    imgView.contentMode = UIViewContentModeScaleAspectFit;
    
    return scrollView;
}

- (void)_initScrollCenter{
    // 设置缩放极限
    _scrCenter.maximumZoomScale = kImgZoomScaleMax;
    _scrCenter.minimumZoomScale = kImgZoomScaleMin;
    
    _scrCenter.delegate = self;
}

// 初始化展示板组
- (void)initImgViewDic{
    
    UIImageView *imgLeft = [self creatImageView];
    UIImageView *imgCenter =[self creatImageView];
    UIImageView *imgRight = [self creatImageView];
    
    _imgViewDic = [[NSDictionary alloc] initWithObjectsAndKeys:
                   imgLeft, @"imgLeft",
                   imgCenter, @"imgCenter",
                   imgRight, @"imgRight", nil];
    
    UIScrollView *scrLeft =
    [self scrollViewWithPosition:MRImgLocationLeft withImgView:imgLeft];
    _scrCenter =
    [self scrollViewWithPosition:MRImgLocationCenter withImgView:imgCenter];
    UIScrollView *scrRight =
    [self scrollViewWithPosition:MRImgLocationRight withImgView:imgRight];
    
    // 初始化scrCenter
    [self _initScrollCenter];
    
    // 添加双击手势
    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapClick:)];
    doubleTap.numberOfTapsRequired = 2;
    
    [self addGestureRecognizer:doubleTap];

    
    // 放入展示板
    [self addSubview:scrLeft];
    [self addSubview:_scrCenter];
    [self addSubview:scrRight];
    

    
}

#pragma mark -setAttribute
// 设置数据源
- (void)setImgSource:(NSMutableArray *)imgSource{
    
    if (_imgSource != imgSource) {

        _imgSource = imgSource;
        
        //  设置展示板尺寸
        [self setConSize];
    }
}

// 展示板尺寸设置
- (void)setConSize{
    
    CGSize size = self.frame.size;
    
    //设置内容视图的大小--单页填充、横向划动
    self.contentSize = CGSizeMake(size.width * kImgViewCount, size.height);
    
    // 设置显示页
    [self setContentOffset:CGPointMake(size.width, 0)];
}

- (void)setCurIndex:(int)curIndex{
    
    if (_imgSource.count > curIndex && curIndex >= 0) {
        _curIndex = curIndex;
    } else if (curIndex == -1){
        _curIndex = (int)_imgSource.count - 1;
    } else if (curIndex == _imgSource.count){
        _curIndex = 0;
    }
    
    // 判断数据类型 根据数据类型抉择使用情况
    // 如果需要使用URL，请导入延展
    Class urlCls = NSClassFromString(@"NSURL");
    
    if (_imgSource.count) {
        if ([_imgSource[0] isKindOfClass:urlCls]) {
            [self setAllImgVContentFromImage:[self imgListURLFromIndex:_curIndex]];
        }else{
            [self setAllImgVContentFromImage:[self imgListFromIndex:_curIndex]];
        }
    }
}

#pragma mark -功能函数
// 根据当前索引通过URL赋值图片
- (NSArray *)imgListURLFromIndex:(NSInteger)curIndex{
    
    long sCount = _imgSource.count;
    NSArray *imgList;
    NSURL *urlL;
    NSURL *urlC;
    NSURL *urlR;
    
    
    //    1、index在首个
    //        L = last  , C = first , R = C + 1
    //    2、index在中间
    //        L = C - 1 , C = index , R = C + 1
    //    3、index在最后
    //        L = C - 1 , C = last  , R = first
    
    //    count == 0
    //        不处理
    //    count == 1
    //        index在首个
    //    count == 2
    //        index在首个或最后
    //    count > 2
    //        正常
    
    if (sCount) {
        
        // 首位
        if (curIndex == 0) {
            urlL = [[NSURL alloc] initWithString:[_imgSource lastObject]];
            urlC = [[NSURL alloc] initWithString:_imgSource[curIndex]];
            long nextIndex = curIndex == sCount - 1 ? curIndex : curIndex + 1;
            urlR = [[NSURL alloc] initWithString:_imgSource[nextIndex]];
            // 末位
        } else if (curIndex == sCount - 1){
            long lastIndex = curIndex == 0 ? curIndex : curIndex - 1;
            urlL = [[NSURL alloc] initWithString:_imgSource[lastIndex] ];
            urlC = [[NSURL alloc] initWithString:[_imgSource lastObject]];
            urlR = [[NSURL alloc] initWithString:_imgSource[0]];
            // 中间
        } else {
            urlL = [[NSURL alloc] initWithString:_imgSource[curIndex - 1] ];
            urlC = [[NSURL alloc] initWithString:_imgSource[curIndex]];
            urlR = [[NSURL alloc] initWithString:_imgSource[curIndex + 1]];
        }
        
        imgList = [[NSArray alloc] initWithObjects:urlL, urlC, urlR, nil];
    }
    
    return imgList;
}

// 根据当前索引赋值图片
- (NSArray *)imgListFromIndex:(NSInteger)curIndex{
    
    long sCount = _imgSource.count;
    NSArray *imgList;
    
    UIImage *imgL;
    UIImage *imgC;
    UIImage *imgR;
    
    if (sCount) {
        
        // 首位
        if (curIndex == 0) {
            imgL = [_imgSource lastObject];
            imgC = _imgSource[curIndex];
            long nextIndex = curIndex == sCount - 1 ? curIndex : curIndex + 1;
            imgR = _imgSource[nextIndex];
            // 末位
        } else if (curIndex == sCount - 1){
            long lastIndex = curIndex == 0 ? curIndex : curIndex - 1;
            imgL = _imgSource[lastIndex] ;
            imgC = [_imgSource lastObject];
            imgR = _imgSource[0];
            // 中间
        } else {
            imgL = _imgSource[curIndex - 1];
            imgC = _imgSource[curIndex];
            imgR = _imgSource[curIndex + 1];
        }
        
        imgList = [[NSArray alloc] initWithObjects:imgL, imgC, imgR, nil];
    }
    
    return imgList;
}

// 载入一组图片
- (void)setAllImgVContentFromImage:(NSArray *)imgList{
    
    // 将所有imgList中的数据载入展示板
    UIImageView *vLift = kImgVLeft;
    UIImageView *vCenter = kImgVCenter;
    UIImageView *vRight = kImgVRight;
    
    Class urlCls = NSClassFromString(@"NSURL");
    
    if (imgList.count) {
        if ([imgList[0] isKindOfClass:urlCls]) {
            //            [vLift setImageWithURL:imgList[MRImgLocationLeft]];
            //            [vCenter setImageWithURL:imgList[MRImgLocationCenter]];
            //            [vRight setImageWithURL:imgList[MRImgLocationRight]];
        }else{
            [vLift setImage:imgList[MRImgLocationLeft]];
            [vCenter setImage:imgList[MRImgLocationCenter]];
            [vRight setImage:imgList[MRImgLocationRight]];
        }
    }
    
}

//// 谦让双击放大手势
//- (void)requireDoubleGestureRecognizer:(UITapGestureRecognizer *)tep{
//    [tep requireGestureRecognizerToFail:[[self gestureRecognizers] lastObject]];
//}

#pragma mark -UIScrollViewDelegate
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    if (self == scrollView) {
        CGFloat width = self.frame.size.width;
        int currentOffset = scrollView.contentOffset.x/width - 1;
        [self setCurIndex:_curIndex + currentOffset];
        [scrollView setContentOffset:CGPointMake(width, 0) animated:NO];
        [_scrCenter setZoomScale:kImgZoomScaleMin];
    } else if (_scrCenter == scrollView)
    {
        CGFloat height = self.frame.size.height;
        CGFloat offsetY = _scrCenter.contentOffset.y;
        
        // 弹出判断
        if (height*1.8 < offsetY || offsetY < height*0.5) {
            [_scrCenter setZoomScale:kImgZoomScaleMin animated:YES];
        }
    }
}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    UIImageView *vCenter = kImgVCenter;
    return vCenter;
}

//#pragma mark -Tap手势处理
- (void)doubleTapClick:(UITapGestureRecognizer *)tap{
    //判断当前放大的比例
    if (true /*_scrCenter.zoomScale > kImgZoomScaleMin*/) {
        //缩小
        [_scrCenter setZoomScale:kImgZoomScaleMin animated:YES];
    }
//    else{
//        //放大
//        [_scrCenter setZoomScale:kImgZoomScaleMax animated:YES];
//    }
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end