//
//  FKLadderTableView.m
//  FirstLink
//
//  Created by jack on 16/8/12.
//  Copyright © 2016年 FirstLink. All rights reserved.
//

#import "FKLadderTableView.h"
#import "FKPullPageTopView.h"
#import "FKPullPageBottomView.h"

@interface FKLadderTableView () <UITableViewDelegate, RefreshControlDelegate>

@property (nonatomic, strong) UITableView   *upTableView;
@property (nonatomic, strong) UITableView   *downTableView;
@property (nonatomic, strong) UIView        *downSegmentView;

@property (nonatomic, weak) id <UITableViewDelegate, UITableViewDataSource, RefreshControlDelegate> tableDelegate;

@end

@implementation FKLadderTableView

- (instancetype)initWithUpTableView:(UITableView *)upTableView
                      downTableView:(UITableView *)downTableView
                    downSegmentView:(UIView *)downSegmentView
                           delegate:(id <UITableViewDelegate, UITableViewDataSource, RefreshControlDelegate>)delegate {
    
    if (self = [super init]) {
        
        self.tableDelegate = delegate;
        
        self.upTableView = upTableView;
        self.downTableView = downTableView;
        self.downSegmentView = downSegmentView;
        
        self.upTableView.delegate = self;
        self.downTableView.delegate = self;
        
        [self addRefresh];
        [self addAllSubviews];
    }
    return self;
}

- (id)forwardingTargetForSelector:(SEL)aSelector{
    
    if ([self.tableDelegate respondsToSelector:aSelector]){
        return self.tableDelegate;
    }
    
    return self;
}

- (BOOL)respondsToSelector:(SEL)aSelector{
    
    if ([super respondsToSelector:aSelector]){
        return YES;
    }
    
    return [self.tableDelegate respondsToSelector:aSelector];
}


- (void)addRefresh{
    
    self.upControl = [[FKRefreshControl alloc] initWithScrollView:self.upTableView delegate:self];
    [self.upControl registerClassForBottomView:[FKPullPageBottomView class]];
    
    self.upControl.topEnabled = YES;
    self.upControl.bottomEnabled = YES;
    self.upControl.enableBottomEngage = NO;
    self.upControl.bottomRefreshOffsetY = -50;
    self.upControl.enableInsetBottom = 46;
    self.upControl.enableInsetTop = (IS_IPHONE_X ? 88 : 64);
    
    self.downControl = [[FKRefreshControl alloc] initWithScrollView:self.downTableView delegate:self];
    [self.downControl registerClassForTopView:[FKPullPageTopView class]];
    
    self.downControl.autoRefreshBottom = YES;
    self.downControl.enableInsetBottom = 0;
    self.downControl.enableTopEngage = NO;
    self.downControl.topEnabled = YES;
    self.downControl.bottomEnabled = YES;
}

- (void)refreshControl:(FKRefreshControl *)refreshControl didEngageRefreshDirection:(RefreshDirection) direction{
    if (refreshControl == self.upControl && direction == RefreshDirectionTop) {
        if ([self.tableDelegate respondsToSelector:@selector(refreshControl:didEngageRefreshDirection:)]) {
            [self.tableDelegate refreshControl:refreshControl didEngageRefreshDirection:direction];
        }
    } else if (refreshControl == self.downControl && direction == RefreshDirectionBottom) {
        if ([self.tableDelegate respondsToSelector:@selector(refreshControl:didEngageRefreshDirection:)]) {
            [self.tableDelegate refreshControl:refreshControl didEngageRefreshDirection:direction];
        }
    }
}

- (void)addAllSubviews{
    
    [self addSubview:self.bgScrollView];
    [self.bgScrollView addSubview:self.upTableView];
    [self.bgScrollView addSubview:self.downSegmentView];
    [self.bgScrollView addSubview:self.downTableView];
    
    [self.bgScrollView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.insets(UIEdgeInsetsZero);
    }];
    
    [self.upTableView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.left.right.equalTo(self.bgScrollView);
        make.width.equalTo(self.bgScrollView);
        make.height.equalTo(self.bgScrollView);
    }];
    
    [self.downSegmentView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.upTableView.mas_bottom);
        make.left.right.equalTo(self.bgScrollView);
        make.width.equalTo(self.upTableView);
        make.height.mas_equalTo(40);
    }];
    
    [self.downTableView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.downSegmentView.mas_bottom);
        make.bottom.left.right.equalTo(self.bgScrollView);
        make.width.equalTo(self.upTableView);
        make.height.equalTo(self.upTableView).offset(- 40 - 20 - 44);
    }];
}

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{
    if (scrollView == self.bgScrollView) {
        if (scrollView.contentOffset.y <= 0) {
            [self.downControl finishRefreshingDirection:RefreshDirectionTop];
        } else if (scrollView.contentOffset.y >= CGRectGetHeight(scrollView.bounds) - 44 - 20) {
            [self.upControl finishRefreshingDirection:RefreshDirectionBottom];
        }
        
    }
}

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{
    CGFloat y = scrollView.contentOffset.y;
    CGFloat contentSizeY = scrollView.contentSize.height;
    
    if (scrollView == self.upTableView ) {
        
        // 56是详情页bottom的高度
        // 46是刷新控件状态变化的距离
        CGFloat visibleAreaH = UISCREENHEIGH - 56;
        if (y + visibleAreaH - contentSizeY >= 46) {
            CGPoint targetPoint = CGPointMake(0, contentSizeY - visibleAreaH);
            *targetContentOffset = targetPoint;
            [self goToDown];
        } else {
            [self.upControl finishRefreshingDirection:RefreshDirectionBottom];
            [self.upTableView setContentInset:UIEdgeInsetsZero];
            
        }
        
    } else if (scrollView == self.downTableView) {
        
        
        if (y < 0) {
            *targetContentOffset = CGPointZero;
            if (y <= - 65) {
                [self goToUp];
            } else {
                [self.downControl finishRefreshingDirection:RefreshDirectionTop];
                [self.downTableView setContentInset:UIEdgeInsetsZero];
            }
        }
    }
    
}

- (void)goToUp{
    
    CGFloat visibleAreaH = UISCREENHEIGH - 56;
    CGFloat contentSizeY = self.upTableView.contentSize.height;
    CGPoint targetPoint = CGPointMake(0, contentSizeY - visibleAreaH);

    self.upTableView.contentOffset = targetPoint;
    self.upTableView.scrollsToTop = YES;
    self.downTableView.scrollsToTop = NO;
    
    self.bgScrollView.tag = 0;
    [self.bgScrollView setContentOffset:CGPointZero animated:YES];
}

- (void)goToDown{
    
    self.upTableView.scrollsToTop = NO;
    self.downTableView.scrollsToTop = YES;
    
    self.bgScrollView.tag = 1;
    [self.bgScrollView setContentOffset:CGPointMake(0, self.bgScrollView.bounds.size.height - 44 - 20 - (IS_IPHONE_X ? 24 : 0)) animated:YES];
}

- (UIScrollView *)bgScrollView{
    if (_bgScrollView == nil) {
        _bgScrollView = [[UIScrollView alloc]init];
        _bgScrollView.showsVerticalScrollIndicator = NO;
        _bgScrollView.showsHorizontalScrollIndicator = NO;
        _bgScrollView.backgroundColor = [UIColor whiteColor];
        _bgScrollView.scrollEnabled = NO;
        _bgScrollView.delegate = self;
    }
    return _bgScrollView;
}

@end