//
//  Collection_Image.m
//  乐销
//
//  Created by 隋林栋 on 2017/1/9.
//  Copyright © 2017年 ping. All rights reserved.
//

#import "Collection_Image.h"
#import "CollectionImageCell.h"//cell
#import "ImageDetailBigView.h"//detail
@interface Collection_Image()<ImagePickerVCDelegate>
@property (nonatomic, strong) XG_AssetModel *placeholderModel;
@end

@implementation Collection_Image

#pragma mark 懒加载
-(NSMutableArray<XG_AssetModel *> *)assets{
    if (!_assets) {
        _assets = @[self.placeholderModel].mutableCopy;
    }
    return _assets;
}

-(XG_AssetModel *)placeholderModel{
    if (!_placeholderModel) {
        _placeholderModel = [[XG_AssetModel alloc]init];
        _placeholderModel.isPlaceholder = YES;
    }
    return _placeholderModel;
}
- (NSMutableArray *)aryPhoto{
    if (!_aryPhoto) {
        _aryPhoto = [NSMutableArray new];
    }
    return _aryPhoto;
}

- (void)openAlbum{
    WEAKSELF
    [[XG_AssetPickerManager manager] handleAuthorizationWithCompletion:^(XG_AuthorizationStatus aStatus) {
        if (aStatus == XG_AuthorizationStatusAuthorized) {
            [weakSelf showAssetPickerController];
        }else{
            [weakSelf showAlert];
        }
    }];
}

- (void)showAssetPickerController{
    XG_AssetPickerOptions *options = [[XG_AssetPickerOptions alloc]init];
    options.maxAssetsCount = 9;
    options.videoPickable = false;
    NSMutableArray<XG_AssetModel *> *array = self.assets;
    [array removeLastObject];//去除占位model
    options.pickedAssetModels = array;
    XG_AssetPickerController *photoPickerVc = [[XG_AssetPickerController alloc] initWithOptions:options delegate:self];
    [GB_Nav pushViewController:photoPickerVc animated:true];
}

- (void)showAlert{
    ModelBtn * modelDismiss = [ModelBtn modelWithTitle:@"取消" imageName:nil highImageName:nil tag:TAG_LINE color:[UIColor redColor]];
    ModelBtn * modelConfirm = [ModelBtn modelWithTitle:@"去设置" imageName:nil highImageName:nil tag:TAG_LINE color:COLOR_BLUE];
    modelConfirm.blockClick = ^(void){
        //去设置
        NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        if ([[UIApplication sharedApplication] canOpenURL:url]) {
            [[UIApplication sharedApplication] openURL:url];
        }
    };
    [BaseAlertView initWithTitle:@"" content:@"未开启相册权限，是否去设置中开启？" aryBtnModels:@[modelDismiss,modelConfirm] viewShow:[UIApplication sharedApplication].keyWindow];
}


- (void)onDeleteBtnClick:(UIButton *)sender{
    /*
     performBatchUpdates并不会调用代理方法collectionView: cellForItemAtIndexPath，
     如果用删除按钮的tag来标识则tag不会更新,所以此处没有用tag
     */
    CollectionImageCell *cell = (CollectionImageCell *)sender.superview.superview;
    NSIndexPath *indexpath = [self.collectionView indexPathForCell:cell];
    [self.collectionView performBatchUpdates:^{
        [self.collectionView deleteItemsAtIndexPaths:@[indexpath]];
        [self.assets removeObjectAtIndex:indexpath.item];
        NSMutableArray *arr = [NSMutableArray array];
        for (XG_AssetModel *model in self.assets) {
            [arr addObject:@(model.isPlaceholder)];
        }
        if (self.assets.count == 8 && (![self.assets containsObject:self.placeholderModel]&&![arr containsObject:@(YES)])) {
            [self.collectionView insertItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:8 inSection:0]]];
            [self.assets addObject:self.placeholderModel];
            
        }
    } completion:^(BOOL finished) {
        
    }];
    NSMutableArray *newAssets = self.assets.mutableCopy;
    NSMutableArray *arr = [NSMutableArray array];
    for (int i =0; i<self.assets.count; i++) {
        XG_AssetModel *model =self.assets[i];
        model.number = 0;
        for (int j=0; j<newAssets.count; j++) {
            XG_AssetModel *pam = newAssets[j];
            if ([model.asset.localIdentifier isEqualToString:pam.asset.localIdentifier]) {
                model.picked = YES;
                model.number = j+1;
                [arr addObject:model];
            }
        }
    }
    if (self.blockDelComplete) {
        self.blockDelComplete(self.assets);
    }
}

#pragma mark - UICollectionViewDataSource

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

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    CollectionImageCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([CollectionImageCell class]) forIndexPath:indexPath];
    cell.imgName=self.imgName;
    cell.model = self.assets[indexPath.item];
    //    [cell resetWithModel:self.assets[indexPath.item]];
    [cell.btnDelete addTarget:self action:@selector(onDeleteBtnClick:) forControlEvents:UIControlEventTouchUpInside];
    WEAKSELF
    [self.aryPhoto removeAllObjects];
    cell.blockModel = ^(UIImage *photo) {
        [weakSelf.aryPhoto addObject:photo];
    };
    return cell;
}


#pragma mark - UICollectionViewDelegate
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    if (!isAry(self.assets)) {
        [self.assets addObject:self.placeholderModel];
    }
    XG_AssetModel *model = self.assets[indexPath.item];
    if (model.isPlaceholder) {
        [self openAlbum];
    }
}

#pragma mark - XG_AssetPickerControllerDelegate

- (void)assetPickerController:(XG_AssetPickerController *)picker didFinishPickingAssets:(NSArray<XG_AssetModel *> *)assets{
    NSMutableArray *newAssets = assets.mutableCopy;
    if (newAssets.count < 9 ) {
        [newAssets addObject:self.placeholderModel];
    }
    [self.assets removeAllObjects];
    [self.assets addObjectsFromArray: newAssets];
    NSMutableArray *arr = [NSMutableArray arrayWithCapacity:9];
        for (int j = 0; j < 9; j++) {
        [arr addObject:[NSNull null]];
    }
    NSMutableArray *arru = [NSMutableArray array];
    dispatch_queue_t serialQueue=dispatch_queue_create("串行", DISPATCH_QUEUE_SERIAL);
    dispatch_sync(serialQueue, ^{
        for (int i =0; i<assets.count; i++) {
            XG_AssetModel *model =assets[i];
            if (model.url) {
                [arru addObject:model];
            }
            if (model.asset) {
                [[XG_AssetPickerManager manager] getPhotoWithAsset1:model.asset completion:^(UIImage *photo, NSDictionary *info) {
                    if (isAry(arru)) {
                            [arr replaceObjectAtIndex:model.number-arru.count-1 withObject:photo];
                    }else{
                            [arr replaceObjectAtIndex:model.number-1 withObject:photo];
                    }
                }];

                
            }
        }
    });
    if (self.blockUpComplete) {
        self.blockUpComplete(arr);
    }
    //    [self resetView];
    [self.collectionView reloadData];
}

- (UICollectionView *)collectionView{
    if (_collectionView == nil) {
        // 1.流水布局
        UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
        
        layout.minimumInteritemSpacing = 1;
        layout.minimumLineSpacing = 1;
        layout.sectionInset = UIEdgeInsetsMake(1, W(7), 0, W(5));
        CGSize size = [self fetchCellSize];
        layout.itemSize = size;
        layout.scrollDirection = self.scrollDirection;
        // 6.创建UICollectionView
        _collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, self.height) collectionViewLayout:layout];
        // 7.设置collectionView的背景色
        _collectionView.backgroundColor = [UIColor whiteColor];
        // 8.设置代理
        _collectionView.collectionViewLayout = layout;
        _collectionView.delegate = self;
        _collectionView.dataSource = self;
        _collectionView.scrollEnabled = YES;
        _collectionView.showsVerticalScrollIndicator = false;
        _collectionView.showsHorizontalScrollIndicator = false;
        [_collectionView registerClass:NSClassFromString(self.collectionCellName) forCellWithReuseIdentifier:self.collectionCellName];
    }
    return _collectionView;
}

#pragma mark 初始化
- (instancetype)init{
    return [self initWithConfig:true];
}
- (instancetype)initWithConfig:(BOOL)config{
    self = [super init];
    if (self) {
        //default
        self.scrollDirection = UICollectionViewScrollDirectionVertical;
        self.isShowTitleBottom = false;
        self.isEditing = true;
        self.backgroundColor = [UIColor clearColor];
        self.widthHeight = XY(SCREEN_WIDTH, 0);
        self.collectionCellName = @"CollectionImageCell";
        //config
        if (config) {
            [self configView];
        }
    }
    return self;
}
- (void)configView{
    [self resetView];
    [self addSubview:self.collectionView];
    self.collectionView.contentInset = UIEdgeInsetsMake(W(1), W(10), 0, self.scrollDirection == UICollectionViewScrollDirectionVertical?W(20):0);
}
-(void)resetView{
    CGSize size = [self fetchCellSize];
    NSInteger count = self.assets.count;
    self.height= count%3 == 0 ? count/3  * size.height + count/3 :count/3 * size.height + count/3 + size.height;
    self.collectionView.height = self.height;
    [self.collectionView reloadData];
    
    //        self.height = (sizeCell.height+W(15))*self.assets.count;
}
#pragma mark fetch cell size
- (CGSize)fetchCellSize{
    return self.isShowTitleBottom?[NSClassFromString(self.collectionCellName)  fetchHeightWithTitle]:[NSClassFromString(self.collectionCellName) fetchHeight];
}


@end