//

//  ZZTableViewController.m

//  多图片下载

//

//  Created by Mac on 16/1/19.

//  Copyright © 2016年 Mac. All rights reserved.

//

#import "ZZTableViewController.h"

#import "ZZApp.h"

@interface ZZTableViewController ()

// 用来存放模型

@property (nonatomic, strong) NSArray *apps;

@property (nonatomic, strong) NSMutableDictionary *iconDic;

// 用于存放下载操作

@property (nonatomic, strong) NSMutableDictionary *operations;

@property (nonatomic, strong) NSOperationQueue *queue;

@end

@implementation ZZTableViewController

- (NSOperationQueue *)queue

{

    if (!_queue) {

        _queue = [[NSOperationQueue alloc] init];

    }

    return _queue;

}

- (NSMutableDictionary *)operations

{

    if (!_operations) {

        _operations = [NSMutableDictionary dictionary];

    }

    return _operations;

}

- (NSMutableDictionary *)iconDic{

    if (!_iconDic) {

         _iconDic = [NSMutableDictionary dictionary];

    }

    return _iconDic;

}

- (NSArray *)apps

{

    if (!_apps) {

         NSMutableArray *tmpArray = [NSMutableArray array];

         NSString *path = [[NSBundle mainBundle] pathForResource:@"apps.plist" ofType:nil];

         NSArray *dicArray = [NSArray arrayWithContentsOfFile:path];

         for (NSDictionary *dic in dicArray) {

                ZZApp *app = [ZZApp appWithdic:dic];

                [tmpArray addObject:app];

         }

        _apps = tmpArray;

    }

    return _apps;

}

- (void)viewDidLoad {

    [super viewDidLoad];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

//#warning Incomplete implementation, return the number of sections

    return ;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

#warning Incomplete implementation, return the number of rows

    return self.apps.count;

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

        static NSString *ID = @"app";

        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];

        ZZApp *app = self.apps[indexPath.row];

        cell.textLabel.text = app.name;

        cell.detailTextLabel.text = app.download;

        UIImage *image =  self.iconDic[app.icon];

        if (image) {// 先判断内存中有没有图片

            cell.imageView.image = image;

        }else{

            NSString *cachePath =  [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];

            // 获得文件名

            NSString *fileName = [app.icon lastPathComponent];

            // 计算出文件全路径

            NSString *file = [cachePath stringByAppendingString:fileName];

            // 加载沙盒数据

            NSData *data = [NSData dataWithContentsOfFile:file];

            // 判断沙盒里有没有数据

            if (data) {// 沙盒中有数据

                    cell.imageView.image = [UIImage imageWithData:data];

//                    cell.imageView.image =

                    // 把数据加载到内存里

                    [self.iconDic setObject:cell.imageView.image forKey:app.icon];

            }else{// 下载图片

//                    cell.imageView.image = [UIImage imageNamed:@"屏幕快照 2016-01-19 下午9.54.43"];

                // 添加下载操作到字典里

                    NSOperation *operation =  [self.operations objectForKey:app.icon];

                    if (!operation) {

                       operation = [NSBlockOperation blockOperationWithBlock:^{

                           NSURL *url = [NSURL URLWithString:app.icon];

                           NSData *data = [NSData  dataWithContentsOfURL:url];

                           if (!data) {// 如果下载失败，移除字典里的操作

                               [self.operations removeObjectForKey:app.icon];

                               return ;

                           }

                            // 回到主线程显示图片

                           [[NSOperationQueue mainQueue] addOperationWithBlock:^{

//                               cell.imageView.image = [UIImage imageWithData:data];

                               [tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];

                           }];

                            // 放到沙盒里

                           [data writeToFile:file atomically:YES];

                           // 将图片存到缓存中

                           [self.iconDic setObject:[UIImage imageWithData:data] forKey:app.icon];

                           // 下载完成，移除操作

                           [self.operations removeObjectForKey:app.icon];

                        }];

                        // 添加到队列里面去

                        [self.queue addOperation:operation];

                        // 添加到操作字典里去

                        [self.operations setObject:operation forKey:app.icon];

                }

            }

        }

    return cell;

}

@end