//
//  KMCloudUploadOperationQueue.m
//  PDF Reader Pro Edition
//
//  Created by 万军 on 2020/2/21.
//  Copyright © 2020 WanJun. All rights reserved.
//

#import "KMCloudUploadOperationQueue.h"
#import "KMCloudOperation.h"

@interface KMCloudUploadOperationQueue ()

@end

@implementation KMCloudUploadOperationQueue
- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:KMServerCloudFileManagerUploadSuccessfulNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:KMServerCloudFileManagerUploadFailureNotification object:nil];
}

+ (instancetype)sharedInstance {
    static KMCloudUploadOperationQueue *sharedInstance;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [KMCloudUploadOperationQueue new];
        sharedInstance.uploadingOperations = [NSMutableDictionary dictionary];
    });
    return sharedInstance;
}

#pragma mark - download

- (void)addUploadOperation:(NSOperation *)op
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(serverCloudFileManagerUploadSuccessfulNotification:) name:KMServerCloudFileManagerUploadSuccessfulNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(serverCloudFileManagerUploadFailureNotification:) name:KMServerCloudFileManagerUploadFailureNotification object:nil];
    
    if ([op isKindOfClass:[KMCloudOperation class]]) {
        KMCloudOperation *operation = (KMCloudOperation *)op;
        if (operation.serverType == KMDropbox) {
            [self addDropboxUploadOperation:(KMCloudOperation *)op];
        } else if (operation.serverType == KMGoogleDrive) {
            [self addGoogleDriveUploadOperation:(KMCloudOperation *)op];
        }
    }
}

- (void)addDropboxUploadOperation:(KMCloudOperation *)op {
    if ([self isUploadOperationExisting:op.filePath]) {
        NSLog(@"KMDropboxOperation exists %@", op);
        return;
    }

    if (![self.uploadingOperations objectForKey:op.filePath]) {
        @synchronized (self) {
            [self.uploadingOperations setObject:op forKey:op.filePath];
        }
        [self addOperation:op];
    }
}

- (void)addGoogleDriveUploadOperation:(KMCloudOperation *)op {
    if ([self isUploadOperationExisting:op.filePath]) {
        NSLog(@"KMGoogleDriveOperation exists %@", op);
        return;
    }

    if (![self.uploadingOperations objectForKey:op.filePath]) {
        @synchronized (self) {
            [self.uploadingOperations setObject:op forKey:op.filePath];
        }
        [self addOperation:op];
    }
}

- (NSOperation *)isUploadOperationExisting:(NSString *)urlString {
    NSLog(@"self.uploadingOperations.allKeys == %@",self.uploadingOperations.allKeys);
    for (NSString *url in self.uploadingOperations.allKeys) {
        if ([url isEqualToString:urlString]) {
            return [self.uploadingOperations objectForKey:url];
        }
    }
    return nil;
}

#pragma mark - cancel
- (void)cancel:(NSString *)urlString {
    NSOperation *op = [self.uploadingOperations objectForKey:urlString];
    if (op) {
        @synchronized (self) {
            [self.uploadingOperations removeObjectForKey:urlString];
        }
    }
}

- (void)cancelAll {
    @synchronized (self) {
        [self.uploadingOperations removeAllObjects];
    }
    [self cancelAllOperations];
}

#pragma mark - NSNotificationCenter

- (void)serverCloudFileManagerUploadSuccessfulNotification:(NSNotification *)notification {
    if (notification.object) {
        KMCloudOperation *operation = (KMCloudOperation *)notification.object;
        if ([self.uploadingOperations objectForKey:operation.filePath]) {
            @synchronized (self) {
                [self.uploadingOperations removeObjectForKey:operation.filePath];
            }
        }
    }
}

- (void)serverCloudFileManagerUploadFailureNotification:(NSNotification *)notification {
    if (notification.object) {
        KMCloudOperation *operation = (KMCloudOperation *)notification.object;
        if ([self.uploadingOperations objectForKey:operation.filePath]) {
            @synchronized (self) {
                [self.uploadingOperations removeObjectForKey:operation.filePath];
            }
        }
    }
}
@end