//
//  OnboardingViewController.swift
//  Tusker
//
//  Created by Shadowfacts on 8/18/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit
import AuthenticationServices

protocol OnboardingViewControllerDelegate {
    
    func didFinishOnboarding()
    
}

class OnboardingViewController: UIViewController {

    var delegate: OnboardingViewControllerDelegate?
    
    @IBOutlet weak var urlTextField: UITextField!
    
    var authenticationSession: ASWebAuthenticationSession?
    
    init() {
        super.init(nibName: "OnboardingViewController", bundle: nil)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    @IBAction func loginPressed(_ sender: Any) {
        guard let text = urlTextField.text,
            let url = URL(string: text),
            var components = URLComponents(string: text) else { return }
        
        LocalData.shared.instanceURL = url
        MastodonController.createClient()
        MastodonController.registerApp {
            let clientID = LocalData.shared.clientID!
            
            let callbackURL = "tusker://oauth"
            
            components.path = "/oauth/authorize"
            components.queryItems = [
                URLQueryItem(name: "client_id", value: clientID),
                URLQueryItem(name: "response_type", value: "code"),
                URLQueryItem(name: "scope", value: "read write follow"),
                URLQueryItem(name: "redirect_uri", value: callbackURL)
            ]
            let url = components.url!
            
            self.authenticationSession = ASWebAuthenticationSession(url: url, callbackURLScheme: callbackURL) { url, error in
                guard error == nil,
                    let url = url,
                    let components = URLComponents(url: url, resolvingAgainstBaseURL: true),
                    let item = components.queryItems?.first(where: { $0.name == "code" }),
                    let authCode = item.value else { fatalError() }
                
                MastodonController.authorize(authorizationCode: authCode) {
                    DispatchQueue.main.async {
                        self.delegate?.didFinishOnboarding()
                    }
                }
            }
            self.authenticationSession!.start()
        }
    }
    
    @IBAction func clearDataPressed(_ sender: Any) {
        LocalData.shared.instanceURL = nil
        LocalData.shared.clientID = nil
        LocalData.shared.clientSecret = nil
        LocalData.shared.accessToken = nil
    }

}