//
//  MXSCycleScrollView3.m
//  2cu
//
//  Created by 高琦 on 15/2/9.
//  Copyright (c) 2015年 guojunyi. All rights reserved.
//
#define RGBA(r,g,b,a)               [UIColor colorWithRed:(float)r/255.0f green:(float)g/255.0f blue:(float)b/255.0f alpha:(float)a]

#import "MXSCycleScrollView3.h"

@implementation MXSCycleScrollView3
@synthesize scrollView = _scrollView;
@synthesize currentPage = _curPage;
@synthesize datasource = _datasource;
@synthesize delegate = _delegate;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        _scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
        _scrollView.delegate = self;
        _scrollView.contentSize = CGSizeMake(self.bounds.size.width, (self.bounds.size.height/3)*5);
        _scrollView.showsHorizontalScrollIndicator = NO;
        _scrollView.showsVerticalScrollIndicator = NO;
        _scrollView.contentOffset = CGPointMake(0, (self.bounds.size.height/3));
        
        [self addSubview:_scrollView];
    }
    return self;
}
//设置初始化页数
- (void)setCurrentSelectPage:(NSInteger)selectPage
{
    _curPage = selectPage;
}

- (void)setDataource:(id<MXSCycleScrollView3Datasource>)datasource
{
    _datasource = datasource;
    //[self reloadData];
}

- (void)reloadData
{
    _totalPages = [_datasource numberOfPages:self];
    if (_totalPages == 0) {
        //return;
        _totalPages = 1;
    }
    [self loadData];
    [self setAfterScrollShowView:_scrollView andCurrentPage:1];
}

- (void)loadData
{
    //从scrollView上移除所有的subview
    NSArray *subViews = [_scrollView subviews];
    if([subViews count] != 0) {
        [subViews makeObjectsPerformSelector:@selector(removeFromSuperview)];
    }
    
    [self getDisplayImagesWithCurpage:(int)_curPage];
    
    for (int i = 0; i < 5; i++) {
        UIView *v = [_curViews objectAtIndex:i];
        v.frame = CGRectOffset(v.frame, 0, v.frame.size.height * i );
        [_scrollView addSubview:v];
    }
    
    [_scrollView setContentOffset:CGPointMake( 0, (self.bounds.size.height/3) )];
}

- (void)getDisplayImagesWithCurpage:(int)page {
    
    int pre2 = [self validPageValue:_curPage-2];
    int pre3 = [self validPageValue:_curPage-1];
    int pre4 = [self validPageValue:_curPage];
    int pre5 = [self validPageValue:_curPage+1];
    int pre = [self validPageValue:_curPage+2];
    
    
    if (!_curViews) {
        _curViews = [[NSMutableArray alloc] init];
    }
    
    [_curViews removeAllObjects];
    
    
    [_curViews addObject:[_datasource pageAtIndex:pre2 andScrollView:self]];
    [_curViews addObject:[_datasource pageAtIndex:pre3 andScrollView:self]];
    [_curViews addObject:[_datasource pageAtIndex:pre4 andScrollView:self]];
    [_curViews addObject:[_datasource pageAtIndex:pre5 andScrollView:self]];
    [_curViews addObject:[_datasource pageAtIndex:pre andScrollView:self]];
    
}

- (int)validPageValue:(NSInteger)value {
    
    if(value == -2) value = _totalPages-2;
    if(value == -1 ) value = _totalPages - 1;
    if(value == _totalPages+1) value = 1;
    if (value == _totalPages+2) value = 2;
    if(value == _totalPages+3) value = 3;
    if (value == _totalPages+4) value = 4;
    if(value == _totalPages) value = 0;
    
    
    return (int)value;
    
}

- (void)handleTap:(UITapGestureRecognizer *)tap {
    
    if ([_delegate respondsToSelector:@selector(didClickPage:atIndex:)]) {
        [_delegate didClickPage:self atIndex:_curPage];
    }
    
}

- (void)setViewContent:(UIView *)view atIndex:(NSInteger)index
{
    if (index == _curPage) {
        [_curViews replaceObjectAtIndex:1 withObject:view];
        for (int i = 0; i < 5; i++) {
            UIView *v = [_curViews objectAtIndex:i];
            v.userInteractionEnabled = YES;
            v.frame = CGRectOffset(v.frame, 0, v.frame.size.height * i);
            [_scrollView addSubview:v];
        }
    }
}

- (void)setAfterScrollShowView:(UIScrollView*)scrollview  andCurrentPage:(NSInteger)pageNumber
{
    
    UILabel *twoLabel = (UILabel*)[[scrollview subviews] objectAtIndex:pageNumber];
    [twoLabel setFont:[UIFont systemFontOfSize:16]];
    [twoLabel setTextColor:RGBA(113.0, 113.0, 113.0, 1.0)];
    
    UILabel *currentLabel = (UILabel*)[[scrollview subviews] objectAtIndex:pageNumber+1];
    [currentLabel setFont:[UIFont systemFontOfSize:18]];
    [currentLabel setTextColor:RGBA(32.0, 94.0, 252.0, 1.0)];
    
    UILabel *threeLabel = (UILabel*)[[scrollview subviews] objectAtIndex:pageNumber+2];
    [threeLabel setFont:[UIFont systemFontOfSize:16]];
    [threeLabel setTextColor:RGBA(113.0, 113.0, 113.0, 1.0)];
    
}

#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)aScrollView {
    int y = aScrollView.contentOffset.y;
    NSInteger page = aScrollView.contentOffset.y/((self.bounds.size.height/3));
    //NSLog(@"第%d页",page);
    
    if (y>2*(self.bounds.size.height/3)) {
        _curPage = [self validPageValue:_curPage+1];
        [self loadData];
    }
    if (y<=0) {
        _curPage = [self validPageValue:_curPage-1];
        [self loadData];
    }
    if (page>1 || page <=0) {
        [self setAfterScrollShowView:aScrollView andCurrentPage:1];
    }
    if ([_delegate respondsToSelector:@selector(scrollviewDidChangeNumber)]) {
        [_delegate scrollviewDidChangeNumber];
    }
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    [self setAfterScrollShowView:scrollView andCurrentPage:1];
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    [_scrollView setContentOffset:CGPointMake(0, (self.bounds.size.height/3)) animated:YES];
    [self setAfterScrollShowView:scrollView andCurrentPage:1];
    if ([_delegate respondsToSelector:@selector(scrollviewDidEndChangeNumber)]) {
        [_delegate scrollviewDidEndChangeNumber];
    }
}

- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
{
    [self setAfterScrollShowView:scrollView andCurrentPage:1];
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    [_scrollView setContentOffset:CGPointMake(0, (self.bounds.size.height/3)) animated:YES];
    [self setAfterScrollShowView:scrollView andCurrentPage:1];
//    if ([_delegate respondsToSelector:@selector(scrollviewDidChangeNumber)]) {
//        [_delegate scrollviewDidChangeNumber];
//    }
    if ([_delegate respondsToSelector:@selector(scrollviewDidEndChangeNumber)]) {
        [_delegate scrollviewDidEndChangeNumber];
    }
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end