//
//  UIView+TFEmptyView.m
//  WXReader
//
//  Created by 谢腾飞 on 2020/11/20.
//  Copyright © 2020 xtfei_2011@126.com. All rights reserved.
//

#import "UIView+TFEmptyView.h"
#import <objc/runtime.h>
#import "TFEmptyView.h"

@implementation UIView (TFEmptyView)

+ (void)exchangeInstanceMethod1:(SEL)method1 method2:(SEL)method2
{
    method_exchangeImplementations(class_getInstanceMethod(self, method1), class_getInstanceMethod(self, method2));
}

static char kEmptyViewKey;
- (void)setXtfei_emptyView:(TFEmptyView *)xtfei_emptyView
{
    if (xtfei_emptyView != self.xtfei_emptyView) {
        
        objc_setAssociatedObject(self, &kEmptyViewKey, xtfei_emptyView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
        
        for (UIView *view in self.subviews) {
            if ([view isKindOfClass:[TFEmptyView class]]) {
                [view removeFromSuperview];
            }
        }
        [self addSubview:self.xtfei_emptyView];
    }
}

- (TFEmptyView *)xtfei_emptyView
{
    return objc_getAssociatedObject(self, &kEmptyViewKey);
}

- (NSInteger)totalDataCount
{
    NSInteger totalCount = 0;
    
    if ([self isKindOfClass:[UITableView class]]) {
        UITableView *tableView = (UITableView *)self;
        
        for (NSInteger section = 0; section < tableView.numberOfSections; section++) {
            totalCount += [tableView numberOfRowsInSection:section];
        }
    } else if ([self isKindOfClass:[UICollectionView class]]) {
        UICollectionView *collectionView = (UICollectionView *)self;
        
        for (NSInteger section = 0; section < collectionView.numberOfSections; section++) {
            totalCount += [collectionView numberOfItemsInSection:section];
        }
    }
    return totalCount;
}

- (void)getDataAndSet
{
    if (!self.xtfei_emptyView) return;
    
    if ([self totalDataCount] == 0) {
        [self show];
    } else {
        [self hide];
    }
}

- (void)show
{
    if (!self.xtfei_emptyView.autoShowEmptyView) {
        self.xtfei_emptyView.hidden = YES;
        return;
    }
    [self xtfei_showEmptyView];
}

- (void)hide
{
    if (!self.xtfei_emptyView.autoShowEmptyView) {
        self.xtfei_emptyView.hidden = YES;
        return;
    }
    [self xtfei_hideEmptyView];
}

- (void)xtfei_showEmptyView
{
    [self.xtfei_emptyView.superview layoutSubviews];
    
    self.xtfei_emptyView.hidden = NO;
    
    [self bringSubviewToFront:self.xtfei_emptyView];
    
    UITableView *tableView = (UITableView *)self;
    if ([tableView isKindOfClass:UITableView.class]) {
        tableView.mj_footer.hidden = YES;
    }
}

- (void)xtfei_hideEmptyView
{
    self.xtfei_emptyView.hidden = YES;
    
    UITableView *tableView = (UITableView *)self;
    if ([tableView isKindOfClass:UITableView.class]) {
        tableView.mj_footer.hidden = NO;
    }
}

- (void)xtfei_startLoading
{
    self.xtfei_emptyView.hidden = YES;
}

- (void)xtfei_endLoading
{
    UITableView *tableView = (UITableView *)self;
    if ([tableView isKindOfClass:UITableView.class]) {
        tableView.mj_footer.hidden = ![self totalDataCount];
    }
    self.xtfei_emptyView.hidden = [self totalDataCount];
}
@end


#pragma Mark  UITableView
@implementation UITableView (TFEmptyView)

+ (void)load
{
    [self exchangeInstanceMethod1:@selector(reloadData) method2:@selector(xtfei_reloadData)];
    [self exchangeInstanceMethod1:@selector(insertSections:withRowAnimation:) method2:@selector(xtfei_insertSections:withRowAnimation:)];
    [self exchangeInstanceMethod1:@selector(deleteSections:withRowAnimation:) method2:@selector(xtfei_deleteSections:withRowAnimation:)];
    [self exchangeInstanceMethod1:@selector(reloadSections:withRowAnimation:) method2:@selector(xtfei_reloadSections:withRowAnimation:)];
    
    [self exchangeInstanceMethod1:@selector(insertRowsAtIndexPaths:withRowAnimation:) method2:@selector(xtfei_insertRowsAtIndexPaths:withRowAnimation:)];
    [self exchangeInstanceMethod1:@selector(deleteRowsAtIndexPaths:withRowAnimation:) method2:@selector(xtfei_deleteRowsAtIndexPaths:withRowAnimation:)];
    [self exchangeInstanceMethod1:@selector(reloadRowsAtIndexPaths:withRowAnimation:) method2:@selector(xtfei_reloadRowsAtIndexPaths:withRowAnimation:)];
}

- (void)xtfei_reloadData
{
    [self xtfei_reloadData];
    [self getDataAndSet];
}

- (void)xtfei_insertSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation
{
    [self xtfei_insertSections:sections withRowAnimation:animation];
    [self getDataAndSet];
}

- (void)xtfei_deleteSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation
{
    [self xtfei_deleteSections:sections withRowAnimation:animation];
    [self getDataAndSet];
}

- (void)xtfei_reloadSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation
{
    [self xtfei_reloadSections:sections withRowAnimation:animation];
    [self getDataAndSet];
}

- (void)xtfei_insertRowsAtIndexPaths:(NSArray<NSIndexPath *> *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
{
    [self xtfei_insertRowsAtIndexPaths:indexPaths withRowAnimation:animation];
    [self getDataAndSet];
}

- (void)xtfei_deleteRowsAtIndexPaths:(NSArray<NSIndexPath *> *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
{
    [self xtfei_deleteRowsAtIndexPaths:indexPaths withRowAnimation:animation];
    [self getDataAndSet];
}

- (void)xtfei_reloadRowsAtIndexPaths:(NSArray<NSIndexPath *> *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
{
    [self xtfei_reloadRowsAtIndexPaths:indexPaths withRowAnimation:animation];
    [self getDataAndSet];
}

@end


#pragma Mark  UICollectionView
@implementation UICollectionView (TFEmptyView)

+ (void)load
{
    [self exchangeInstanceMethod1:@selector(reloadData) method2:@selector(xtfei_reloadData)];
    [self exchangeInstanceMethod1:@selector(insertSections:) method2:@selector(xtfei_insertSections:)];
    [self exchangeInstanceMethod1:@selector(deleteSections:) method2:@selector(xtfei_deleteSections:)];
    [self exchangeInstanceMethod1:@selector(reloadSections:) method2:@selector(xtfei_reloadSections:)];
    
    [self exchangeInstanceMethod1:@selector(insertItemsAtIndexPaths:) method2:@selector(xtfei_insertItemsAtIndexPaths:)];
    [self exchangeInstanceMethod1:@selector(deleteItemsAtIndexPaths:) method2:@selector(xtfei_deleteItemsAtIndexPaths:)];
    [self exchangeInstanceMethod1:@selector(reloadItemsAtIndexPaths:) method2:@selector(xtfei_reloadItemsAtIndexPaths:)];
}

- (void)xtfei_reloadData
{
    [self xtfei_reloadData];
    [self getDataAndSet];
}

- (void)xtfei_insertSections:(NSIndexSet *)sections
{
    [self xtfei_insertSections:sections];
    [self getDataAndSet];
}

- (void)xtfei_deleteSections:(NSIndexSet *)sections
{
    [self xtfei_deleteSections:sections];
    [self getDataAndSet];
}

- (void)xtfei_reloadSections:(NSIndexSet *)sections
{
    [self xtfei_reloadSections:sections];
    [self getDataAndSet];
}

- (void)xtfei_insertItemsAtIndexPaths:(NSArray<NSIndexPath *> *)indexPaths
{
    [self xtfei_insertItemsAtIndexPaths:indexPaths];
    [self getDataAndSet];
}

- (void)xtfei_deleteItemsAtIndexPaths:(NSArray<NSIndexPath *> *)indexPaths
{
    [self xtfei_deleteItemsAtIndexPaths:indexPaths];
    [self getDataAndSet];
}

- (void)xtfei_reloadItemsAtIndexPaths:(NSArray<NSIndexPath *> *)indexPaths
{
    [self xtfei_reloadItemsAtIndexPaths:indexPaths];
    [self getDataAndSet];
}
@end