// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//


/*!
    @enum NSURLCacheStoragePolicy
    
    @discussion The NSURLCacheStoragePolicy enum defines constants that
    can be used to specify the type of storage that is allowable for an
    NSCachedURLResponse object that is to be stored in an NSURLCache.
    
    @constant NSURLCacheStorageAllowed Specifies that storage in an
    NSURLCache is allowed without restriction.

    @constant NSURLCacheStorageAllowedInMemoryOnly Specifies that
    storage in an NSURLCache is allowed; however storage should be
    done in memory only, no disk storage should be done.

    @constant NSURLCacheStorageNotAllowed Specifies that storage in an
    NSURLCache is not allowed in any fashion, either in memory or on
    disk.
*/
public enum NSURLCacheStoragePolicy : UInt {
    
    case Allowed
    case AllowedInMemoryOnly
    case NotAllowed
}

/*!
    @class NSCachedURLResponse
    NSCachedURLResponse is a class whose objects functions as a wrapper for
    objects that are stored in the framework's caching system. 
    It is used to maintain characteristics and attributes of a cached 
    object. 
*/
public class NSCachedURLResponse : NSObject, NSSecureCoding, NSCopying {
    
    public required init?(coder aDecoder: NSCoder) {
        NSUnimplemented()
    }
    
    public func encodeWithCoder(aCoder: NSCoder) {
        NSUnimplemented()
    }
    
    static public func supportsSecureCoding() -> Bool {
        return true
    }
    
    public override func copy() -> AnyObject {
        return copyWithZone(nil)
    }
    
    public func copyWithZone(zone: NSZone) -> AnyObject {
        NSUnimplemented()
    }

    /*!
        @method initWithResponse:data
        @abstract Initializes an NSCachedURLResponse with the given
        response and data.
        @discussion A default NSURLCacheStoragePolicy is used for
        NSCachedURLResponse objects initialized with this method:
        NSURLCacheStorageAllowed.
        @param response a NSURLResponse object.
        @param data an NSData object representing the URL content
        corresponding to the given response.
        @result an initialized NSCachedURLResponse.
    */
    public init(response: NSURLResponse, data: NSData) { NSUnimplemented() }
    
    /*! 
        @method initWithResponse:data:userInfo:storagePolicy:
        @abstract Initializes an NSCachedURLResponse with the given
        response, data, user-info dictionary, and storage policy.
        @param response a NSURLResponse object.
        @param data an NSData object representing the URL content
        corresponding to the given response.
        @param userInfo a dictionary user-specified information to be
        stored with the NSCachedURLResponse.
        @param storagePolicy an NSURLCacheStoragePolicy constant.
        @result an initialized NSCachedURLResponse.
    */
    public init(response: NSURLResponse, data: NSData, userInfo: [NSObject : AnyObject]?, storagePolicy: NSURLCacheStoragePolicy) { NSUnimplemented() }
    
    /*! 
        @method response
        @abstract Returns the response wrapped by this instance. 
        @result The response wrapped by this instance. 
    */
    /*@NSCopying*/ public var response: NSURLResponse { NSUnimplemented() }
    
    /*! 
        @method data
        @abstract Returns the data of the receiver. 
        @result The data of the receiver. 
    */
    /*@NSCopying*/ public var data: NSData { NSUnimplemented() }
    
    /*! 
        @method userInfo
        @abstract Returns the userInfo dictionary of the receiver. 
        @result The userInfo dictionary of the receiver. 
    */
    public var userInfo: [NSObject : AnyObject]? { NSUnimplemented() }
    
    /*! 
        @method storagePolicy
        @abstract Returns the NSURLCacheStoragePolicy constant of the receiver. 
        @result The NSURLCacheStoragePolicy constant of the receiver. 
    */
    public var storagePolicy: NSURLCacheStoragePolicy { NSUnimplemented() }
}

public class NSURLCache : NSObject {
    
    /*! 
        @method sharedURLCache
        @abstract Returns the shared NSURLCache instance.
        @discussion Unless set explicitly through a call to
        <tt>+setSharedURLCache:</tt>, this method returns an NSURLCache
        instance created with the following default values:
        <ul>
        <li>Memory capacity: 4 megabytes (4 * 1024 * 1024 bytes)
        <li>Disk capacity: 20 megabytes (20 * 1024 * 1024 bytes)
        <li>Disk path: <nobr>(user home directory)/Library/Caches/(application bundle id)</nobr> 
        </ul>
        <p>Users who do not have special caching requirements or
        constraints should find the default shared cache instance
        acceptable. If this default shared cache instance is not
        acceptable, <tt>+setSharedURLCache:</tt> can be called to set a
        different NSURLCache instance to be returned from this method.
        @result the shared NSURLCache instance.
    */
    public class func sharedURLCache() -> NSURLCache { NSUnimplemented() }
    
    /*! 
        @method setSharedURLCache:
        @abstract Sets the NSURLCache instance shared by all clients of
        the current process. This will be the new object returned when
        calls to the <tt>sharedURLCache</tt> method are made.
        @discussion Callers should take care to ensure that this method is called
        at a time when no other caller has a reference to the previously-set shared
        URL cache. This is to prevent storing cache data from becoming 
        unexpectedly unretrievable.
        @param cache the new shared NSURLCache instance.
    */
    public class func setSharedURLCache(cache: NSURLCache) { NSUnimplemented() }
    
    /*! 
        @method initWithMemoryCapacity:diskCapacity:diskPath:
        @abstract Initializes an NSURLCache with the given capacity and
        path.
        @discussion The returned NSURLCache is backed by disk, so
        developers can be more liberal with space when choosing the
        capacity for this kind of cache. A disk cache measured in the tens
        of megabytes should be acceptable in most cases.
        @param capacity the capacity, measured in bytes, for the cache.
        @param path the path on disk where the cache data is stored.
        @result an initialized NSURLCache, with the given capacity, backed
        by disk.
    */
    public init(memoryCapacity: Int, diskCapacity: Int, diskPath path: String?) { NSUnimplemented() }
    
    /*! 
        @method cachedResponseForRequest:
        @abstract Returns the NSCachedURLResponse stored in the cache with
        the given request.
        @discussion The method returns nil if there is no
        NSCachedURLResponse stored using the given request.
        @param request the NSURLRequest to use as a key for the lookup.
        @result The NSCachedURLResponse stored in the cache with the given
        request, or nil if there is no NSCachedURLResponse stored with the
        given request.
    */
    public func cachedResponseForRequest(request: NSURLRequest) -> NSCachedURLResponse? { NSUnimplemented() }
    
    /*! 
        @method storeCachedResponse:forRequest:
        @abstract Stores the given NSCachedURLResponse in the cache using
        the given request.
        @param cachedResponse The cached response to store.
        @param request the NSURLRequest to use as a key for the storage.
    */
    public func storeCachedResponse(cachedResponse: NSCachedURLResponse, forRequest request: NSURLRequest) { NSUnimplemented() }
    
    /*! 
        @method removeCachedResponseForRequest:
        @abstract Removes the NSCachedURLResponse from the cache that is
        stored using the given request. 
        @discussion No action is taken if there is no NSCachedURLResponse
        stored with the given request.
        @param request the NSURLRequest to use as a key for the lookup.
    */
    public func removeCachedResponseForRequest(request: NSURLRequest) { NSUnimplemented() }
    
    /*! 
        @method removeAllCachedResponses
        @abstract Clears the given cache, removing all NSCachedURLResponse
        objects that it stores.
    */
    public func removeAllCachedResponses() { NSUnimplemented() }
    
    /*!
     @method removeCachedResponsesSince:
     @abstract Clears the given cache of any cached responses since the provided date.
     */
    public func removeCachedResponsesSinceDate(date: NSDate) { NSUnimplemented() }
    
    /*! 
        @method memoryCapacity
        @abstract In-memory capacity of the receiver. 
        @discussion At the time this call is made, the in-memory cache will truncate its contents to the size given, if necessary.
        @result The in-memory capacity, measured in bytes, for the receiver. 
    */
    public var memoryCapacity: Int
    
    /*! 
        @method diskCapacity
        @abstract The on-disk capacity of the receiver. 
        @discussion At the time this call is made, the on-disk cache will truncate its contents to the size given, if necessary.
        @param diskCapacity the new on-disk capacity, measured in bytes, for the receiver.
    */
    public var diskCapacity: Int
    
    /*! 
        @method currentMemoryUsage
        @abstract Returns the current amount of space consumed by the
        in-memory cache of the receiver.
        @discussion This size, measured in bytes, indicates the current
        usage of the in-memory cache. 
        @result the current usage of the in-memory cache of the receiver.
    */
    public var currentMemoryUsage: Int { NSUnimplemented() }
    
    /*! 
        @method currentDiskUsage
        @abstract Returns the current amount of space consumed by the
        on-disk cache of the receiver.
        @discussion This size, measured in bytes, indicates the current
        usage of the on-disk cache. 
        @result the current usage of the on-disk cache of the receiver.
    */
    public var currentDiskUsage: Int { NSUnimplemented() }
}

extension NSURLCache {
    public func storeCachedResponse(cachedResponse: NSCachedURLResponse, forDataTask dataTask: NSURLSessionDataTask) { NSUnimplemented() }
    public func getCachedResponseForDataTask(dataTask: NSURLSessionDataTask, completionHandler: (NSCachedURLResponse?) -> Void) { NSUnimplemented() }
    public func removeCachedResponseForDataTask(dataTask: NSURLSessionDataTask) { NSUnimplemented() }
}