//
//  ViewController.m
//  UI11_网络解析
//
//  Created by lanou3g on 17/8/17.
//  Copyright © 2017年 lanou3g. All rights reserved.
//

#import "ViewController.h"
#import "Song.h"

@interface ViewController () <UITableViewDataSource,UITableViewDelegate>

@property (nonatomic, retain) NSMutableArray *songArray;
@property (nonatomic, retain) UITableView *tableView;
@property (nonatomic, assign) NSInteger pageNumber;
@property (nonatomic, assign) BOOL isRefresh;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.songArray = [NSMutableArray array];
    self.pageNumber = 1;
    UITableView *tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    tableView.delegate = self;
    tableView.dataSource = self;
    [self.view addSubview:tableView];
    self.tableView = tableView;

    NSString *URLString = @"http://172.18.26.196/get.php?page=1";
    [self getDataWithURLString:URLString];
   
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {

}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
    
    CGFloat offsetY = scrollView.contentOffset.y;
    CGFloat contentHeight = scrollView.contentSize.height;
    
    if (contentHeight <= scrollView.frame.size.height) {
        contentHeight = scrollView.frame.size.height;
    }
    
    if (offsetY >= contentHeight-scrollView.frame.size.height+50) {
        self.isRefresh = NO;
        self.pageNumber++;
        NSString *URLString = [NSString stringWithFormat:@"http://172.18.26.196/get.php?page=%ld",self.pageNumber];
        [self getDataWithURLString:URLString];
    } else if (offsetY <= -80.f) {
        self.isRefresh = YES;
        self.pageNumber = 1;
        NSString *URLString = [NSString stringWithFormat:@"http://172.18.26.196/get.php?page=%ld",self.pageNumber];
        [self getDataWithURLString:URLString];
    }
    NSLog(@"%lf",offsetY);
}

- (void)getDataWithURLString:(NSString *)URLString {
    NSURL *url = [NSURL URLWithString:URLString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
        //异步             主线程
        dispatch_async(dispatch_get_main_queue(), ^{
            
            if (self.isRefresh) {
                [self.songArray removeAllObjects];
            }
            
            
            if (!error) {
                id result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
                NSLog(@"result:%@",result);
                
                for (NSDictionary *songDic in result) {
                    Song *song = [[Song alloc] init];
                    [song setValuesForKeysWithDictionary:songDic];
                    [self.songArray addObject:song];
                }
                //刷新tableView数据
                [self.tableView reloadData];
                
            } else {
                NSLog(@"error:%@",error);
            }
        });
    }];
    [dataTask resume];
}

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    Song *song = self.songArray[indexPath.row];
    static NSString *songId = @"song";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:songId];
    if (nil == cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:songId];
    }
    
    cell.textLabel.text = song.name;
    cell.detailTextLabel.text = song.singerName;
    return cell;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

//
//  Song.h
//  UI11_网络解析
//
//  Created by lanou3g on 17/8/17.
//  Copyright © 2017年 lanou3g. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Song : NSObject
///歌曲名称
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *number;
@property (nonatomic, copy) NSString *pic;
@property (nonatomic, copy) NSString *singerName;
@property (nonatomic, copy) NSString *url;

@end

//
//  Song.m
//  UI11_网络解析
//
//  Created by lanou3g on 17/8/17.
//  Copyright © 2017年 lanou3g. All rights reserved.
//

#import "Song.h"

@implementation Song

- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
    
}

@end