//
//  NetWorkCache.swift
//  PaiAi
//
//  Created by yangbin on 4/20/16.
//  Copyright © 2016 FFIB. All rights reserved.
//

import UIKit
import Alamofire

let DefaultNetWorkCache = NetWorkCache()
struct NetWorkCache {
    init() { }
    
    func saveCache(_ task: URLSessionTask, params: [String : AnyObject], data: Data) {
        guard let request = task.originalRequest, let url = request.url?.absoluteString else {
            return
        }
        let cacheRequest = Alamofire.request(url, method: .get, parameters: params)
        cacheRequest.cancel()
        let cacheRespone = CachedURLResponse(response: task.response!, data: data)
        URLCache.shared.storeCachedResponse(cacheRespone, for: cacheRequest.request!)
    }
    
    func getCache(_ task: URLSessionTask, params: [String : AnyObject]) -> [String : AnyObject]? {
        guard let request = task.originalRequest, let url = request.url?.absoluteString else {
            return nil
        }
        let cacheRequest = Alamofire.request(url, method: .get, parameters: params).request
        let cache = URLCache.shared.cachedResponse(for: cacheRequest!)
        guard let data = cache?.data else {
            return nil
        }
        guard let res = try?JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [String: AnyObject] else {
            return nil
        }
        return res
    }
}