//
//  ViewController.swift
//  dcav-uploader
//
//  Created by Alexander Munch-hansen on 31/07/2017.
//  Copyright © 2017 Guava. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate, UITextFieldDelegate, URLSessionDelegate, URLSessionTaskDelegate, URLSessionDataDelegate {
    
    @IBOutlet weak var labell: UILabel!
    @IBOutlet weak var imageView: UIImageView!
    var imagePickerController : UIImagePickerController!
    @IBOutlet weak var dcavTextField: UITextField!
    var responseString : String!
    @IBOutlet weak var uploadProgressBar: UIProgressView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        UserDefaults.standard.synchronize()
        dcavTextField.delegate = self
        labell.text = UserDefaults.standard.string(forKey: "username_preference")
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    @IBAction func onLibraryButton(_ sender: Any) {
        imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.sourceType = .photoLibrary
        present(imagePickerController, animated: true, completion: nil)
    }
    
    @IBAction func onPhotoButton(_ sender: Any) {
        imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.sourceType = .camera
        present(imagePickerController, animated: true, completion: nil)
    }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        imagePickerController.dismiss(animated: true, completion: nil)
        imageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage
    }
    
    func setTextInField(path: String) {
        dcavTextField.text = path
    }
    
    @IBAction func onSaveButton(_ sender: Any) {
    }

    @IBAction func onUploadButton(_ sender: Any) {
        guard let username : String = UserDefaults.standard.string(forKey: "username_preference") else {
            print("USERNAME, MOTHERFUCKER!")
            // TODO create proper pop-up
            return
        }
        guard let passphrase : String = UserDefaults.standard.string(forKey: "passphrase_preference") else {
            // TODO create proper pop-up
            print("PASSPHRASE, MOTHERFUCKER!")
            return
        }

        let request = generateRequest(user: username, pass: passphrase)
        
        let session = URLSession(configuration: URLSessionConfiguration.default, delegate: self, delegateQueue: OperationQueue.main)
        
        let task = session.dataTask(with: request) { data, response, error in
            guard let data = data, error == nil else {                                                 // check for fundamental networking error
                print("error=\(String(describing: error))")
                return
            }
            
            if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {           // check for http errors
                print("statusCode should be 200, but is \(httpStatus.statusCode)")
                print("response = \(String(describing: response))")
            }
            self.responseString = String(data: data, encoding: .utf8)!
            print("responseString = \(String(describing: self.responseString))")
            DispatchQueue.main.async() {
            self.setTextInField(path: "https://dcav.pw/\(String(describing: self.labell.text![(self.labell.text!.startIndex)]))\(String(describing: self.responseString!))")
            }
        }
        
        task.resume()
    }
    
    func generateBoundaryString() -> String {
        return "Boundary-\(NSUUID().uuidString)"
    }
    
    func generateRequest(user: String, pass: String) -> URLRequest {
        let params : [String : String] = [ "user": user, "pass": pass ]
        
        let url = URL(string: UserDefaults.standard.string(forKey: "endpoint_preference")!)
        
        let boundary = generateBoundaryString()
        
        var request = URLRequest(url: url!)
        request.httpMethod = "POST"
        request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
        
        let imageData: Data = UIImagePNGRepresentation(imageView.image!)!
        
        var body = Data()
        
        for (key, value) in params {
            body.append(Data("--\(boundary)\r\n".utf8))
            body.append(Data("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n".utf8))
            body.append(Data("\(value)\r\n".utf8))
        }
        
        let mimetype : String = "application/octet-stream"
        
        body.append(Data("--\(boundary)\r\n".utf8))
        body.append(Data("Content-Disposition: form-data; name=\"imagedata\"; filename=\"lolfag.png\"\r\n".utf8))
        body.append(Data("Content-Type: \(mimetype)\r\n\r\n".utf8))
        body.append(imageData)
        body.append(Data("\r\n".utf8))
        
        body.append(Data("--\(boundary)--\r\n".utf8))
        request.httpBody = body
        
        return request
    }
    
    //MARK:Update progress bar
    func urlSession(_ session: URLSession, task: URLSessionTask, didSendBodyData bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) {
        uploadProgressBar.progress = Float(totalBytesSent) / Float(totalBytesExpectedToSend)
        print(String(describing: uploadProgressBar.progress))
    }
}