//
//  DKPhotoPickerAssetsViewController.m
//  DKAssetsPickerDemo
//

//  Copyright (c) 2014年 com.zixue101.www. All rights reserved.
//


#import <AssetsLibrary/AssetsLibrary.h>
#import "DKPhoto.h"
#import "DKPhotoPickerCollectionView.h"
#import "DKPhotoPickerGroup.h"
#import "DKPhotoPickerCollectionViewCell.h"
#import "DKPhotoPickerFooterCollectionReusableView.h"
#import "Util.h"

static CGFloat CELL_ROW = 4;
static CGFloat CELL_MARGIN = 2;
static CGFloat CELL_LINE_MARGIN = 2;
static CGFloat TOOLBAR_HEIGHT = 44;

static NSString *const _cellIdentifier = @"cell";
static NSString *const _footerIdentifier = @"FooterView";
static NSString *const _identifier = @"toolBarThumbCollectionViewCell";
@interface DKPhotoPickerAssetsViewController () <DKPhotoPickerCollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegate,DKPhotoPickerBrowserViewControllerDataSource,DKPhotoPickerBrowserViewControllerDelegate>

// View
// 相片View
@property (nonatomic , strong) DKPhotoPickerCollectionView *collectionView;
// 底部CollectionView
@property (nonatomic , weak) UICollectionView *toolBarThumbCollectionView;
// 标记View
@property (nonatomic , weak) UILabel *makeView;
@property (nonatomic , strong) UIButton *doneBtn;
@property (nonatomic , weak) UIToolbar *toolBar;

@property (assign,nonatomic) NSUInteger privateTempMinCount;
// Datas
// 数据源
@property (nonatomic , strong) NSMutableArray *assets;
// 记录选中的assets
@property (nonatomic , strong) NSMutableArray *selectAssets;
@end

@implementation DKPhotoPickerAssetsViewController

#pragma mark - getter
#pragma mark Get Data
- (NSMutableArray *)selectAssets{
    if (!_selectAssets) {
        _selectAssets = [NSMutableArray array];
    }
    return _selectAssets;
}

#pragma mark Get View
- (UIButton *)doneBtn{
    if (!_doneBtn) {
        UIButton *rightBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [rightBtn setTitleColor:[UIColor colorWithRed:0/255.0 green:91/255.0 blue:255/255.0 alpha:1.0] forState:UIControlStateNormal];
        [rightBtn setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];
        rightBtn.enabled = YES;
        rightBtn.titleLabel.font = [UIFont systemFontOfSize:17];
        rightBtn.frame = CGRectMake(0, 0, 45, 45);
        [rightBtn setTitle:@"完成" forState:UIControlStateNormal];
        [rightBtn addTarget:self action:@selector(done) forControlEvents:UIControlEventTouchUpInside];
        [rightBtn addSubview:self.makeView];
        self.doneBtn = rightBtn;
    }
    return _doneBtn;
}

- (UICollectionView *)toolBarThumbCollectionView{
    if (!_toolBarThumbCollectionView) {
        
        UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
        flowLayout.itemSize = CGSizeMake(40, 40);
        flowLayout.minimumInteritemSpacing = 0;
        flowLayout.minimumLineSpacing = 5;
        flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
        
        // CGRectMake(0, 22, 300, 44)
        UICollectionView *toolBarThumbCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(10, 0, self.view.width - 100, 44) collectionViewLayout:flowLayout];
        toolBarThumbCollectionView.backgroundColor = [UIColor clearColor];
        toolBarThumbCollectionView.dataSource = self;
        toolBarThumbCollectionView.delegate = self;
        [toolBarThumbCollectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:_identifier];
        
        self.toolBarThumbCollectionView = toolBarThumbCollectionView;
        [self.toolBar addSubview:toolBarThumbCollectionView];
        
    }
    return _toolBarThumbCollectionView;
}

- (void)setSelectPickerAssets:(NSArray *)selectPickerAssets{
    NSSet *set = [NSSet setWithArray:selectPickerAssets];
    _selectPickerAssets = [set allObjects];
    
    if (!self.assets) {
        self.assets = [NSMutableArray arrayWithArray:selectPickerAssets];
    }else{
        [self.assets addObjectsFromArray:selectPickerAssets];
    }
    
    for (DKPhotoAssets *assets in selectPickerAssets) {
        if ([assets isKindOfClass:[DKPhotoAssets class]]) {
            [self.selectAssets addObject:assets];
        }

    }

    self.collectionView.lastDataArray = nil;
    self.collectionView.isRecoderSelectPicker = YES;
    self.collectionView.selectAsstes = self.selectAssets;
    NSInteger count = self.selectAssets.count;

    self.makeView.text = [NSString stringWithFormat:@"%ld",(long)(count+self.cameraCount)];
    self.makeView.hidden = !(count+self.cameraCount);
    self.doneBtn.enabled = (count > 0);
}

#pragma mark collectionView
- (DKPhotoPickerCollectionView *)collectionView{
    if (!_collectionView) {
        
        CGFloat cellW = (self.view.frame.size.width - CELL_MARGIN * CELL_ROW + 1) / CELL_ROW;
        UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
        layout.itemSize = CGSizeMake(cellW, cellW);
        layout.minimumInteritemSpacing = 0;
        layout.minimumLineSpacing = CELL_LINE_MARGIN;
        layout.footerReferenceSize = CGSizeMake(self.view.frame.size.width, TOOLBAR_HEIGHT * 2);
        
        DKPhotoPickerCollectionView *collectionView = [[DKPhotoPickerCollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        // 时间置顶
        collectionView.status = DKPickerCollectionViewShowOrderStatusTimeDesc;
        collectionView.translatesAutoresizingMaskIntoConstraints = NO;
        [collectionView registerClass:[DKPhotoPickerCollectionViewCell class] forCellWithReuseIdentifier:_cellIdentifier];
        // 底部的View
        [collectionView registerClass:[DKPhotoPickerFooterCollectionReusableView class]  forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:_footerIdentifier];
        
        collectionView.contentInset = UIEdgeInsetsMake(5, 0,TOOLBAR_HEIGHT, 0);
        collectionView.collectionViewDelegate = self;
        [self.view insertSubview:collectionView belowSubview:self.toolBar];
        self.collectionView = collectionView;
        
        NSDictionary *views = NSDictionaryOfVariableBindings(collectionView);
        
        NSString *widthVfl = @"H:|-0-[collectionView]-0-|";
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:widthVfl options:0 metrics:nil views:views]];
        
        NSString *heightVfl = @"V:|-0-[collectionView]-0-|";
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:heightVfl options:0 metrics:nil views:views]];
        
    }
    return _collectionView;
}

#pragma mark makeView 红点标记View
- (UILabel *)makeView{
    if (!_makeView) {
        UILabel *makeView = [[UILabel alloc] init];
        makeView.textColor = [UIColor whiteColor];
        makeView.textAlignment = NSTextAlignmentCenter;
        makeView.font = [UIFont systemFontOfSize:13];
        makeView.frame = CGRectMake(-5, -5, 20, 20);
        makeView.hidden = YES;
        makeView.layer.cornerRadius = makeView.frame.size.height / 2.0;
        makeView.clipsToBounds = YES;
        makeView.backgroundColor = [UIColor redColor];
        [self.view addSubview:makeView];
        self.makeView = makeView;
        
    }
    return _makeView;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.bounds = [UIScreen mainScreen].bounds;
    self.view.backgroundColor = [UIColor whiteColor];
    
    // 初始化按钮
    [self setupButtons];
    
    // 初始化底部ToorBar
    [self setupToorBar];
}


#pragma mark - setter
#pragma mark 初始化按钮
- (void) setupButtons{
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"取消" style:UIBarButtonItemStyleDone target:self action:@selector(back)];
}

#pragma mark 初始化所有的组
- (void) setupAssets{
    if (!self.assets) {
        self.assets = [NSMutableArray array];
    }
    
    __block NSMutableArray *assetsM = [NSMutableArray array];
    __weak typeof(self) weakSelf = self;
    
    [[DKPhotoPickerDatas defaultPicker] getGroupPhotosWithGroup:self.assetsGroup finished:^(NSArray *assets) {
        [assets enumerateObjectsUsingBlock:^(ALAsset *asset, NSUInteger idx, BOOL *stop) {
            DKPhotoAssets *DKAsset = [[DKPhotoAssets alloc] init];
            DKAsset.asset = asset;
            [assetsM addObject:DKAsset];
        }];

        weakSelf.collectionView.dataArray = assetsM;
    }];
    
}

#pragma mark -初始化底部ToorBar
- (void) setupToorBar{
    UIToolbar *toorBar = [[UIToolbar alloc] init];
    toorBar.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:toorBar];
    self.toolBar = toorBar;
    
    NSDictionary *views = NSDictionaryOfVariableBindings(toorBar);
    NSString *widthVfl =  @"H:|-0-[toorBar]-0-|";
    NSString *heightVfl = [NSString stringWithFormat:@"%@%f%@",@"V:[toorBar(44)]-",[Util obtainHomeAreaHeight],@"-|"];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:widthVfl options:0 metrics:0 views:views]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:heightVfl options:0 metrics:0 views:views]];
    
    // 左视图 中间距 右视图
    UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:self.toolBarThumbCollectionView];
    UIBarButtonItem *fiexItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    UIBarButtonItem *rightItem = [[UIBarButtonItem alloc] initWithCustomView:self.doneBtn];
    
    toorBar.items = @[leftItem,fiexItem,rightItem];
    
}

#pragma mark - setter
-(void)setMinCount:(NSInteger)minCount{
    _minCount = minCount;
    
    if (!_privateTempMinCount) {
        _privateTempMinCount = minCount;
    }

    if (self.selectAssets.count == minCount){
        minCount = 0;
    }else if (self.selectPickerAssets.count - self.selectAssets.count > 0) {
        minCount = _privateTempMinCount;
    }
    
    self.collectionView.minCount = minCount;
}
-(void)setCameraCount:(NSInteger)cameraCount{
    _cameraCount=cameraCount;
    self.collectionView.cameraCount = cameraCount;
}

- (void)setAssetsGroup:(DKPhotoPickerGroup *)assetsGroup{
    if (!assetsGroup.groupName.length) return ;
    
    _assetsGroup = assetsGroup;
    
    self.title = assetsGroup.groupName;
    
    // 获取Assets
    [self setupAssets];
}


- (void) pickerCollectionViewDidSelected:(DKPhotoPickerCollectionView *) pickerCollectionView deleteAsset:(DKPhotoAssets *)deleteAssets{
    
    if (self.selectPickerAssets.count == 0){
        self.selectAssets = [NSMutableArray arrayWithArray:pickerCollectionView.selectAsstes];
    }else if (deleteAssets == nil){
        [self.selectAssets addObject:[pickerCollectionView.selectAsstes lastObject]];
    }
    
//    self.selectAssets = [NSMutableArray arrayWithArray:[[NSSet setWithArray:self.selectAssets] allObjects]];

    NSInteger count = self.selectAssets.count;
    self.makeView.hidden = !count;
    self.makeView.text = [NSString stringWithFormat:@"%ld",(long)(count+self.cameraCount)];
    self.doneBtn.enabled = (count > 0);
    
    [self.toolBarThumbCollectionView reloadData];
    
    if (self.selectPickerAssets.count || deleteAssets) {
        DKPhotoAssets *asset = [pickerCollectionView.lastDataArray lastObject];
        if (deleteAssets){
            asset = deleteAssets;
        }
        
        NSInteger selectAssetsCurrentPage = -1;
        for (NSInteger i = 0; i < self.selectAssets.count; i++) {
            DKPhotoAssets *photoAsset = self.selectAssets[i];
            if([[[[asset.asset defaultRepresentation] url] absoluteString] isEqualToString:[[[photoAsset.asset defaultRepresentation] url] absoluteString]]){
                selectAssetsCurrentPage = i;
                break;
            }
        }
        
        if (
            (self.selectAssets.count > selectAssetsCurrentPage)
            &&
            (selectAssetsCurrentPage >= 0)
            ){
            if (deleteAssets){
                [self.selectAssets removeObjectAtIndex:selectAssetsCurrentPage];
            }
            [self.collectionView.selectsIndexPath removeObject:@(selectAssetsCurrentPage)];
            [self.toolBarThumbCollectionView reloadData];
            self.makeView.text = [NSString stringWithFormat:@"%ld",(long)self.selectAssets.count+self.cameraCount];
        }
        // 刷新下最小的页数
        self.minCount = self.selectAssets.count + (_privateTempMinCount - self.selectAssets.count);
    }
}

#pragma mark -
#pragma mark - UICollectionViewDataSource
- (NSInteger) numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return 1;
}

- (NSInteger) collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return self.selectAssets.count;
}

- (UICollectionViewCell *) collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:_identifier forIndexPath:indexPath];
    
    if (self.selectAssets.count > indexPath.item) {
        UIImageView *imageView = [[cell.contentView subviews] lastObject];
        // 判断真实类型
        if (![imageView isKindOfClass:[UIImageView class]]) {
            imageView = [[UIImageView alloc] initWithFrame:cell.bounds];
            imageView.contentMode = UIViewContentModeScaleAspectFit;
            imageView.clipsToBounds = YES;
            [cell.contentView addSubview:imageView];
        }
        
        imageView.tag = indexPath.item;
        imageView.image = [self.selectAssets[indexPath.item] originImage];
    }
    
    return cell;
}

#pragma mark -
#pragma makr UICollectionViewDelegate
- (void) collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    
    UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
    
    DKPhotoPickerBrowserViewController *browserVc = [[DKPhotoPickerBrowserViewController alloc] init];
    browserVc.toView = [cell.contentView.subviews lastObject];
    browserVc.currentIndexPath = [NSIndexPath indexPathForItem:indexPath.item inSection:0];
    browserVc.delegate = self;
    browserVc.dataSource = self;
    [self presentViewController:browserVc animated:NO completion:nil];
}

- (NSInteger)photoBrowser:(DKPhotoPickerBrowserViewController *)photoBrowser numberOfItemsInSection:(NSUInteger)section{
    return self.selectAssets.count;
}

-  (DKPhotoPickerBrowserPhoto *)photoBrowser:(DKPhotoPickerBrowserViewController *)pickerBrowser photoAtIndexPath:(NSIndexPath *)indexPath{
    DKPhotoPickerBrowserPhoto *photo = [[DKPhotoPickerBrowserPhoto alloc] init];
    photo.asset = self.selectAssets[indexPath.row];
    return photo;
}
- (void)photoBrowser:(DKPhotoPickerBrowserViewController *)photoBrowser removePhotoAtIndexPath:(NSIndexPath *)indexPath{
    
    // 删除选中的照片
    ALAsset *asset = self.selectAssets[indexPath.row];
    NSInteger currentPage = 0;
    for (NSInteger i = 0; i < self.collectionView.dataArray.count; i++) {
        ALAsset *photoAsset = self.collectionView.dataArray[i];
        if([[[[asset defaultRepresentation] url] absoluteString] isEqualToString:[[[photoAsset defaultRepresentation] url] absoluteString]]){
            currentPage = i;
            break;
        }
    }
    
    [self.selectAssets removeObjectAtIndex:indexPath.row];
    [self.collectionView.selectsIndexPath removeObject:@(currentPage)];
    [self.toolBarThumbCollectionView reloadData];
    [self.collectionView reloadData];
    
    self.makeView.text = [NSString stringWithFormat:@"%ld",(unsigned long)self.selectAssets.count];
}

#pragma mark -<Navigation Actions>
#pragma mark -开启异步通知
- (void) back{
    [self dismissViewControllerAnimated:YES completion:nil];
}
- (void) done{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        [[NSNotificationCenter defaultCenter] postNotificationName:PICKER_TAKE_DONE object:nil userInfo:@{@"selectAssets":self.selectAssets}];
    });
    [self dismissViewControllerAnimated:YES completion:nil];
}


- (void)dealloc{
    // 赋值给上一个控制器
    self.groupVc.selectAsstes = self.selectAssets;
}

@end