Learn-Genie/Learn Genie/View Controller/WelcomeSliderViewController.swift

//
//  WelcomeSliderViewController.swift
//  Learn Genie
//
//  Created by Suraj Kumar Mandal on 19/08/21.
//

import UIKit

class WelcomeSliderViewController: UIViewController {
    
    @IBOutlet weak var backgroundView: UIView!
    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var contentLabel: UILabel!
    @IBOutlet weak var skipButton: UIButton!
    @IBOutlet weak var nextButton: UIButton!
    
    var currentPage = 1
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }
    
    override func viewWillAppear(_ animated: Bool) {
        setupUI()
        addGesture()
    }
    
    func setupUI() {
        //Skip button design
        skipButton.layer.borderWidth = 1
        skipButton.layer.cornerRadius = 5
        skipButton.layer.borderColor = UIColor.black.cgColor
        //Next button design
        nextButton.layer.borderWidth = 1
        nextButton.layer.cornerRadius = 5
        nextButton.layer.borderColor = UIColor.black.cgColor
        
        contentChange()
    }
    
    func addGesture() {
        let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:)))
        let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:)))
            
        leftSwipe.direction = .left
        rightSwipe.direction = .right

        view.addGestureRecognizer(leftSwipe)
        view.addGestureRecognizer(rightSwipe)
    }
    
    func contentChange() {
        if currentPage == 1 {
            backgroundView.backgroundColor = AppColor.onboarding1
            imageView.image = UIImage(named: Constant.onboarding1)
            contentLabel.text = Helper.translateText(inputText: Constant.content1)
            nextButton.setTitle(Helper.translateText(inputText: Constant.Next), for: .normal)
            skipButton.isHidden = false
        } else if currentPage == 2 {
            backgroundView.backgroundColor = AppColor.onboarding2
            imageView.image = UIImage(named: Constant.onboarding2)
            contentLabel.text = Helper.translateText(inputText: Constant.content2)
            nextButton.setTitle(Helper.translateText(inputText: Constant.Next), for: .normal)
            skipButton.isHidden = false
        } else if currentPage == 3 {
            backgroundView.backgroundColor = AppColor.onboarding3
            imageView.image = UIImage(named: Constant.onboarding3)
            contentLabel.text = Helper.translateText(inputText: Constant.content3)
            nextButton.setTitle(Helper.translateText(inputText: Constant.GetStarted), for: .normal)
            skipButton.isHidden = true
        }
    }
    
    @objc func handleSwipes(_ sender: UISwipeGestureRecognizer) {
        if sender.direction == .left {
           print("Swipe left")
           // show the view from the right side
            if currentPage > 3 {
                currentPage += 1
                contentChange()
            }
        }

        if sender.direction == .right {
           print("Swipe right")
           // show the view from the left side
            if currentPage > 1 {
                currentPage -= 1
                contentChange()
            }
        }
    }

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */
    
    @IBAction func nextButtonAction(_ sender: UIButton) {
        if sender.currentTitle == Constant.GetStarted {
            //Set Welcome slider status to false
            UserDefaults.standard.set(false, forKey: Constant.welcomeSlider)
            UserDefaults.standard.synchronize()
            //Navigate to login screen
            DispatchQueue.main.async {
                let loginVC = self.storyboard?.instantiateViewController(withIdentifier:"LoginViewController" ) as! LoginViewController
                self.navigationController?.pushViewController(loginVC, animated: true)
            }
        } else {
            currentPage += 1
            contentChange()
        }
    }
    
    @IBAction func skipButtonAction(_ sender: UIButton) {
        //Set Welcome slider status to false
        UserDefaults.standard.set(false, forKey: Constant.welcomeSlider)
        UserDefaults.standard.synchronize()
        //Navigate to login screen
        DispatchQueue.main.async {
            let loginVC = self.storyboard?.instantiateViewController(withIdentifier:"LoginViewController" ) as! LoginViewController
            self.navigationController?.pushViewController(loginVC, animated: true)
        }
    }
    
}