#import "UIView+WebCacheOperation.h"
#import "objc/runtime.h"



typedef NSMapTable<NSString *, id<SDWebImageOperation>> SDOperationsDictionary;

@implementation UIView (WebCacheOperation)

- (SDOperationsDictionary *)sd_operationDictionary {
    @synchronized(self) {
        SDOperationsDictionary *operations = objc_getAssociatedObject(self, @selector(sd_operationDictionary));
        if (operations) {
            return operations;
        }
        operations = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory valueOptions:NSPointerFunctionsWeakMemory capacity:0];
        objc_setAssociatedObject(self, @selector(sd_operationDictionary), operations, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
        return operations;
    }
}

- (nullable id<SDWebImageOperation>)sd_imageLoadOperationForKey:(nullable NSString *)key  {
    id<SDWebImageOperation> operation;
    if (!key) {
        key = NSStringFromClass(self.class);
    }
    SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
    @synchronized (self) {
        operation = [operationDictionary objectForKey:key];
    }
    return operation;
}

- (void)sd_setImageLoadOperation:(nullable id<SDWebImageOperation>)operation forKey:(nullable NSString *)key {
    if (!key) {
        key = NSStringFromClass(self.class);
    }
    if (operation) {
        SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
        @synchronized (self) {
            [operationDictionary setObject:operation forKey:key];
        }
    }
}

- (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key {
    if (!key) {
        key = NSStringFromClass(self.class);
    }
    
    SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
    id<SDWebImageOperation> operation;
    
    @synchronized (self) {
        operation = [operationDictionary objectForKey:key];
    }
    if (operation) {
        if ([operation respondsToSelector:@selector(cancel)]) {
            [operation cancel];
        }
        @synchronized (self) {
            [operationDictionary removeObjectForKey:key];
        }
    }
}

- (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key {
    if (!key) {
        key = NSStringFromClass(self.class);
    }
    SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
    @synchronized (self) {
        [operationDictionary removeObjectForKey:key];
    }
}

@end