//
//  CarRequest.swift
//  Cats
//
//  Created by Руслан on 26.10.2019.
//  Copyright © 2019 Руслан. All rights reserved.
//

import Foundation
import UIKit

class CatRequest {

    func getCat(url: String = "https://api.thecatapi.com/v1/images/search", completionSuccess: @escaping (UIImage) -> Void, completionError: @escaping (String) -> Void) {
        guard let url = URL(string: url) else {return}
        let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
            guard error == nil else {
                completionError(error?.localizedDescription ?? "Error connection")
                return
            }

            guard let data = data,
                let jsonArray = try? JSONSerialization.jsonObject(with: data) as? [[String: Any]],
                let json = jsonArray.first else {
                    completionError("Nil data received")
                    return
            }

            guard let cat: Cat = Cat(json) else {
                completionError("Malformed data received")
                return
            }

            self.downlandImage(url: cat.url, completion: { (image) in
                if let image = image {
                    completionSuccess(image)
                } else {
                    completionError("Nil data Image")
                }
            })
        }
        task.resume()
    }

    func downlandImage(url: String, completion: @escaping (UIImage?) -> Void){
        guard let url = URL(string: url) else {
            completion(nil)
            return
        }
        let task = URLSession.shared.dataTask(with: url) { data, response, error in
            guard
                let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
                let mimeType = response?.mimeType, mimeType.hasPrefix("image"),
                let data = data, error == nil,
                let image = UIImage(data: data)
                else {
                    completion(nil)
                    return
                }
            completion(image)
            }
       task.resume()
    }

}