JSJP_Student/jiaPei/Modules/BaseModule/BaseClass/ViewController/RQTableViewController.m

//
//  RQTableViewController.m
//  RQCommon
//
//  Created by 张嵘 on 2018/11/23.
//  Copyright © 2018 张嵘. All rights reserved.
//

#import "RQTableViewController.h"


@interface RQTableViewController ()
/// tableView
@property (nonatomic, readwrite, weak)   RQTableView *tableView;
/// contentInset defaul is (64 , 0 , 0 , 0)
@property (nonatomic, readwrite, assign) UIEdgeInsets contentInset;
/// 视图模型
@property (nonatomic, readonly, strong) RQTableViewModel *viewModel;
@end

@implementation RQTableViewController

@dynamic viewModel;

- (void)dealloc {
	// set nil
	_tableView.dataSource = nil;
	_tableView.delegate = nil;
}

/// init
- (instancetype)initWithViewModel:(RQTableViewModel *)viewModel {
	self = [super initWithViewModel:viewModel];
	if (self) {
		if ([viewModel shouldRequestRemoteDataOnViewDidLoad]) {
			@weakify(self)
			[[self rac_signalForSelector:@selector(viewDidLoad)] subscribeNext:^(id x) {
				@strongify(self)
				/// 请求第一页的网络数据
                [[self.viewModel.requestRemoteDataCommand execute:@1] subscribeCompleted:^{
                    if (self.viewModel.dataSource.count >= self.viewModel.perPage) {
                        self.viewModel.page = 2;
                    }
                }];
			}];
		}
	}
	return self;
}


- (void)viewDidLoad
{
	[super viewDidLoad];
	// 设置子控件
	[self _su_setupSubViews];
	
}

/// override
- (void)bindViewModel
{
	[super bindViewModel];
	
	/// observe viewModel's dataSource
	@weakify(self)
	[[RACObserve(self.viewModel, dataSource)
	  deliverOnMainThread]
	 subscribeNext:^(id x) {
		 @strongify(self)
		 // 刷新数据
		 [self reloadData];
	 }];
	
	/// 隐藏emptyView
	[self.viewModel.requestRemoteDataCommand.executing subscribeNext:^(NSNumber *executing) {
		@strongify(self)
		UIView *emptyDataSetView = [self.tableView.subviews.rac_sequence objectPassingTest:^(UIView *view) {
			return [NSStringFromClass(view.class) isEqualToString:@"DZNEmptyDataSetView"];
		}];
		emptyDataSetView.alpha = 1.0 - executing.floatValue;
	}];
	
	
	//    [self.viewModel.requestRemoteDataCommand.executionSignals.switchToLatest subscribeNext:^(id _) {
	//        @strongify(self);
	//        /// 有网络
	//        self.viewModel.disableNetwork = NO;
	//    }];
	//
	//    [self.viewModel.requestRemoteDataCommand.errors subscribeNext:^(id _) {
	//        @strongify(self);
	//        /// 有无网络
	//        self.viewModel.disableNetwork = !self.viewModel.services.client.reachabilityManager.reachable;
	//    }];
}

#pragma mark - 设置子控件
/// setup add `_su_` avoid sub class override it
- (void)_su_setupSubViews{
	// set up tableView
	/// RQ FIXED: 纯代码布局，子类如果重新布局，建议用Masonry重新设置约束
	RQTableView *tableView = [[RQTableView alloc] initWithFrame:[UIScreen mainScreen].bounds style:self.viewModel.style];
	tableView.backgroundColor = RQ_LIST_BACKGROUNDCOLOR;
	tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
	// set delegate and dataSource
	tableView.delegate = self;
	tableView.dataSource = self;
	[self.view addSubview:tableView];
	
	/// 占位符
	//    tableView.emptyDataSetDelegate = self;
	//    tableView.emptyDataSetSource = self;
	//    [tableView mas_makeConstraints:^(MASConstraintMaker *make) {
	//        make.edges.mas_equalTo(UIEdgeInsetsZero);
	//    }];
	
	
	self.tableView = tableView;
	tableView.contentInset  = self.contentInset;
	// 注册cell
	[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"UITableViewCell"];
	
	/// RQ FIXED: 这里需要强制布局一下界面，解决由于设置了tableView的contentInset，然而contentOffset始终是（0，0）的bug 但是这样会导致 tableView 刷新一次，从而导致子类在 viewDidLoad 无法及时注册的cell，从而会有Crash的隐患
	//        [self.tableView layoutIfNeeded];
	//        [self.tableView setNeedsLayout];
	//        [self.tableView updateConstraintsIfNeeded];
	//        [self.tableView setNeedsUpdateConstraints];
	//        [self.view layoutIfNeeded];
	
	/// 添加加载和刷新控件
	if (self.viewModel.shouldPullDownToRefresh) {
		/// 下拉刷新
		@weakify(self);
		[self.tableView rq_addHeaderRefresh:^(MJRefreshNormalHeader *header) {
			/// 加载下拉刷新的数据
			@strongify(self);
			[self tableViewDidTriggerHeaderRefresh];
		}];
//		[self.tableView.mj_header beginRefreshing];
	}
	
	if (self.viewModel.shouldPullUpToLoadMore) {
		/// 上拉加载
		@weakify(self);
		[self.tableView rq_addFooterRefresh:^(MJRefreshAutoNormalFooter *footer) {
			/// 加载上拉刷新的数据
			@strongify(self);
			[self tableViewDidTriggerFooterRefresh];
		}];
        
		/// 隐藏footer or 无更多数据
		RAC(self.tableView.mj_footer, hidden) = [[RACObserve(self.viewModel, dataSource)
												  deliverOnMainThread]
												 map:^(NSArray *dataSource) {
													 @strongify(self)
													 NSUInteger count = dataSource.count;
													 /// 无数据，默认隐藏mj_footer
													 if (count == 0) return @1;
            
                                                     /// 无更多数据，隐藏mj_footer
                                                     if (count == self.viewModel.dataTotalNum) return @1;
													 
													 if (self.viewModel.shouldEndRefreshingWithNoMoreData) return @(0);
													 
													 /// because of
													 return (count % self.viewModel.perPage)?@1:@0;
												 }];
		
	}
	
	
	if (@available(iOS 11.0, *)) {
		/// RQ: 适配 iPhone X + iOS 11，
		RQAdjustsScrollViewInsets_Never(tableView);
		/// iOS 11上发生tableView顶部有留白，原因是代码中只实现了heightForHeaderInSection方法，而没有实现viewForHeaderInSection方法。那样写是不规范的，只实现高度，而没有实现view，但代码这样写在iOS 11之前是没有问题的，iOS 11之后应该是由于开启了估算行高机制引起了bug。
		tableView.estimatedRowHeight = 0;
		tableView.estimatedSectionHeaderHeight = 0;
		tableView.estimatedSectionFooterHeight = 0;
	}
}

#pragma mark - 上下拉刷新事件
/// 下拉事件
- (void)tableViewDidTriggerHeaderRefresh{
	@weakify(self)
    self.viewModel.page = 1;
	[[[self.viewModel.requestRemoteDataCommand
	   execute:@1]
	  deliverOnMainThread]
	 subscribeNext:^(id x) {
		 @strongify(self)
        if (self.viewModel.dataSource.count >= self.viewModel.perPage) {
            self.viewModel.page = 2;
        }
		 /// 重置没有更多的状态
		 if (self.viewModel.shouldEndRefreshingWithNoMoreData) [self.tableView.mj_footer resetNoMoreData];
	 } error:^(NSError *error) {
		 @strongify(self)
		 /// 已经在bindViewModel中添加了对viewModel.dataSource的变化的监听来刷新数据,所以reload = NO即可
		 [self.tableView.mj_header endRefreshing];
	 } completed:^{
		 @strongify(self)
		 /// 已经在bindViewModel中添加了对viewModel.dataSource的变化的监听来刷新数据,所以只要结束刷新即可
		 [self.tableView.mj_header endRefreshing];
		 /// 请求完成
		 [self _requestDataCompleted];
	 }];
}

/// 上拉事件
- (void)tableViewDidTriggerFooterRefresh{
	@weakify(self);
    NSInteger currentPage = self.viewModel.page + 1;
	[[[self.viewModel.requestRemoteDataCommand
	   execute:@(currentPage)]
	  deliverOnMainThread]
	 subscribeNext:^(id x) {
		 @strongify(self)
		 self.viewModel.page += 1;
	 } error:^(NSError *error) {
		 @strongify(self);
		 [self.tableView.mj_footer endRefreshing];
	 } completed:^{
		 @strongify(self)
		 [self.tableView.mj_footer endRefreshing];
		 /// 请求完成
		 [self _requestDataCompleted];
	 }];
}


#pragma mark - sub class can override it
/// 配置tableView的区域
- (UIEdgeInsets)contentInset {
    return UIEdgeInsetsMake((RQ_APPLICATION_NAV_BAR_HEIGHT + RQ_APPLICATION_STATUS_BAR_HEIGHT), 0, 0, 0);
}

/// reload tableView data
- (void)reloadData{
	[self.tableView reloadData];
}

/// duqueueReusavleCell
- (UITableViewCell *)tableView:(UITableView *)tableView dequeueReusableCellWithIdentifier:(NSString *)identifier forIndexPath:(NSIndexPath *)indexPath {
	return [tableView dequeueReusableCellWithIdentifier:identifier forIndexPath:indexPath];
}

/// configure cell data
- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath withObject:(id)object {}


#pragma mark - 辅助方法
- (void)_requestDataCompleted{
	NSUInteger count = self.viewModel.dataSource.count;
	/// RQ Fixed: 这里必须要等到，底部控件结束刷新后，再来设置无更多数据，否则被叠加无效
	if (self.viewModel.shouldEndRefreshingWithNoMoreData && count%self.viewModel.perPage) [self.tableView.mj_footer endRefreshingWithNoMoreData];
}


#pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
	
	if (self.viewModel.shouldMultiSections) return self.viewModel.dataSource ? self.viewModel.dataSource.count : 0;
	return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
	if (self.viewModel.shouldMultiSections) return [(NSArray *)self.viewModel.dataSource[section] count];
	return self.viewModel.dataSource.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
	
	UITableViewCell *cell = [self tableView:tableView dequeueReusableCellWithIdentifier:@"UITableViewCell" forIndexPath:indexPath];
	
	// fetch object
	id object = nil;
	if (self.viewModel.shouldMultiSections) object = self.viewModel.dataSource[indexPath.section][indexPath.row];
	if (!self.viewModel.shouldMultiSections) object = self.viewModel.dataSource[indexPath.row];
	
	/// bind model
	[self configureCell:cell atIndexPath:indexPath withObject:(id)object];
	return cell;
}


#pragma mark - UITableViewDelegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
	[tableView deselectRowAtIndexPath:indexPath animated:YES];
	// execute commond
	[self.viewModel.didSelectCommand execute:indexPath];
}


- (BOOL)shouldCustomizeNavigationBarTransitionIfHideable {
    return YES;
}

- (void)qmui_themeDidChangeByManager:(QMUIThemeManager *)manager identifier:(__kindof NSObject<NSCopying> *)identifier theme:(__kindof NSObject *)theme {
    [super qmui_themeDidChangeByManager:manager identifier:identifier theme:theme];
    [self.tableView reloadData];
}
@end