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- (NSArray *)datas {
    if (_datas == nil) {
        NSMutableArray *temp = [NSMutableArray array];
        NSString *path = [[NSBundle mainBundle] pathForResource:@"apps.plist" ofType:nil];
        NSArray *arr = [NSArray arrayWithContentsOfFile:path];
        
        for (NSDictionary *dict in arr) {
            CellData *data = [CellData dataWithDict:dict];
            [temp addObject:data];
        }
        
        _datas = temp;
    }
    
    return _datas;
}

- (NSMutableDictionary *)cacheDatas {
    if (_cacheDatas == nil) {
        _cacheDatas = [NSMutableDictionary dictionary];
    }
    
    return _cacheDatas;
}

- (NSString *)savePath {
    if (_savePath == nil) {
        NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
        _savePath = path;
    }
    
    return _savePath;
}

- (NSMutableDictionary *)operationDict {
    if (_operationDict == nil) {
        _operationDict = [NSMutableDictionary dictionary];
    }
    
    return _operationDict;
    
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.datas.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellID = @"cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
    
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellID];
    }
    
    
    
    CellData *data = self.datas[indexPath.row];
    
    cell.textLabel.text = data.name;
    cell.detailTextLabel.text = data.download;
    
    
    NSString *fileName = [data.icon lastPathComponent];
    
    UIImage *image = self.cacheDatas[fileName];
    
    if (image) {
        NSLog(@"m has images");
        cell.imageView.image = image;
    } else {
        
        image = [UIImage imageWithContentsOfFile:[self.savePath stringByAppendingPathComponent:fileName]];
        
        if (image) {
            NSLog(@"m1 has images");
            cell.imageView.image = image;
            self.cacheDatas[fileName] = image;
        } else {
            NSLog(@"m2 has images");
            NSOperationQueue *queue = [[NSOperationQueue alloc] init];
            queue.maxConcurrentOperationCount = 2;
            
            cell.imageView.image = [UIImage imageNamed:@"place"];
            
            NSBlockOperation *op = self.operationDict[fileName];
            
            if (op == nil) {
                NSLog(@"m3  has images");
                op = [NSBlockOperation blockOperationWithBlock:^{
                    NSLog(@"download image %@", [NSThread currentThread]);
                    NSURL *url = [NSURL URLWithString:data.icon];
                    NSData *urlData = [NSData dataWithContentsOfURL:url];
                    
                    if (urlData == nil) {
                        return;
                    }
                    
                    UIImage *image = [[UIImage alloc] initWithData:urlData];
                    
                    if (image) {
                        self.cacheDatas[fileName] = image;
                    }
                    
                    [urlData writeToFile:[self.savePath stringByAppendingPathComponent:fileName] atomically:YES];
                    
                    NSOperationQueue *queueMain = [NSOperationQueue mainQueue];
                    
                    [queueMain addOperationWithBlock:^{
                        [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
                    }];
                    
                    [self.operationDict removeObjectForKey:fileName];
                }];
                
                [queue addOperation:op];
                self.operationDict[fileName] = op;
            }
        }
    }
    return cell;
}