Privado-iOS/iOS/Privado/Sources/Flows/LaunchScreenFlow/Module/View/LaunchScreenController.swift

//
//  LaunchScreenController.swift
//  PrivadoVPN
//
//  Created by Viktor on 09.12.2020.
//  Copyright © 2020 Privado LLC. All rights reserved.
//

import Foundation
import UIKit

final class LaunchScreenController: UIViewController {
    
    private enum Constants {
        static let top: CGFloat = 45
        static let left: CGFloat = 34
        static let right: CGFloat = 6
        static let bottom: CGFloat = 6
        
        static let bottomView: CGFloat = 106
        
        static let bottomButtonH: CGFloat = 32
        static let bottomButtonV: CGFloat = 23
    }
    
    private let output: LaunchScreenControllerOutput
    
    private let content: UITextView = {
        let webview = UITextView()
        webview.isEditable = false
        webview.isSelectable = false
        webview.backgroundColor = .clear
        return webview
    }()

    private let bottomView: UIView = {
        let bottom = UIView()
        bottom.backgroundColor = UIColor(red: 25, green: 33, blue: 71)
        return bottom
    }()
    
    private let bottomButton: UIButton = {
        let button = UIButton()
        button.backgroundColor = UIColor(red: 40, green: 215, blue: 153)
        button.roundCorners(corners: [.layerMinXMinYCorner, .layerMaxXMinYCorner, .layerMinXMaxYCorner, .layerMaxXMaxYCorner], radius: 33)
        return button
    }()
    
    
    // MARK: - Init
    
    init(output: LaunchScreenControllerOutput) {
        self.output = output
        super.init(nibName: nil, bundle: nil)
    }
    
    override func loadView() {
        let view = UIView(frame: .zero)
        view.autoresizesSubviews = true
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = .white
        self.view = view
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // MARK: - Lyfecycle
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.configureUI()
        
        self.output.viewIsReady()
    }
    
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent // .default
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        if let superview = self.view.superview {
            NSLayoutConstraint.activate([
                self.view.topAnchor.constraint(equalTo: superview.topAnchor),
                self.view.leadingAnchor.constraint(equalTo: superview.leadingAnchor),
                self.view.trailingAnchor.constraint(equalTo: superview.trailingAnchor),
                self.view.bottomAnchor.constraint(equalTo: superview.bottomAnchor)
            ])
        }
    }

    // MARK: - UI
    
    private func configureUI() {
        
        self.view.backgroundColor = UIColor(red: 21, green: 25, blue: 53)
        
        self.bottomView.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(self.bottomView)
        NSLayoutConstraint.activate([
            self.bottomView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor),
            self.bottomView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
            self.bottomView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
            self.bottomView.heightAnchor.constraint(equalToConstant: Constants.bottomView)
        ])
        
        self.bottomButton.translatesAutoresizingMaskIntoConstraints = false
        self.bottomView.addSubview(self.bottomButton)
        NSLayoutConstraint.activate([
            self.bottomButton.leadingAnchor.constraint(equalTo: self.bottomView.leadingAnchor, constant: Constants.bottomButtonH),
            self.bottomButton.trailingAnchor.constraint(equalTo: self.bottomView.trailingAnchor, constant: -Constants.bottomButtonH),
            self.bottomButton.topAnchor.constraint(equalTo: self.bottomView.topAnchor, constant: Constants.bottomButtonV),
            self.bottomButton.bottomAnchor.constraint(equalTo: self.bottomView.bottomAnchor, constant: -Constants.bottomButtonV)
        ])
        
        let buttonTitle = NSAttributedString(string: "AGREE & CONTINUE", attributes: [
            .font: UIFont.boldSystemFont(ofSize: 21),
            .foregroundColor: UIColor.white
        ])
        self.bottomButton.setAttributedTitle(buttonTitle, for: .normal)
        self.bottomButton.addTarget(self, action: #selector(buttonClick), for: .touchUpInside)
        
        self.content.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(self.content)
        NSLayoutConstraint.activate([
            self.content.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: Constants.left),
            self.content.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: -Constants.right),
            self.content.topAnchor.constraint(equalTo: self.view.topAnchor, constant: Constants.top),
            self.content.bottomAnchor.constraint(equalTo: self.bottomView.topAnchor, constant: -Constants.bottom)
            ])

        let attributedString = NSMutableAttributedString(string: NSLocalizedString("launch.content", comment: "Content of First Start"), attributes: [
          .font: UIFont.systemFont(ofSize: 16.67, weight: .regular),
          .foregroundColor: UIColor(red: 122.0 / 255.0, green: 133.0 / 255.0, blue: 190.0 / 255.0, alpha: 1.0),
          .kern: -0.83

        ])

        attributedString.addAttribute(.font, value: UIFont.systemFont(ofSize: 16.67, weight: .bold), range: NSRange(location: 147, length: 22))
        attributedString.addAttribute(.font, value: UIFont.systemFont(ofSize: 16.67, weight: .bold), range: NSRange(location: 302, length: 26))
        attributedString.addAttribute(.font, value: UIFont.systemFont(ofSize: 16.67, weight: .bold), range: NSRange(location: 334, length: 6))
        attributedString.addAttribute(.font, value: UIFont.systemFont(ofSize: 16.67, weight: .bold), range: NSRange(location: 501, length: 21))
        attributedString.addAttribute(.font, value: UIFont.systemFont(ofSize: 16.67, weight: .bold), range: NSRange(location: 364+290, length: 46))
        attributedString.addAttribute(.font, value: UIFont.systemFont(ofSize: 16.67, weight: .bold), range: NSRange(location: 477+291, length: 56))
        attributedString.addAttribute(.font, value: UIFont.systemFont(ofSize: 16.67, weight: .bold), range: NSRange(location: 477+397, length: 71))
        let titleAttributedString = NSMutableAttributedString(string: NSLocalizedString("launch.top", comment: "Title") + "\n\n", attributes: [
            .font: UIFont.systemFont(ofSize: 30, weight: .regular),
            .foregroundColor: UIColor.white
        ])
        
        titleAttributedString.append(attributedString)
        self.content.attributedText = titleAttributedString
        
        self.content.contentOffset = .zero
    }
    
    @objc
    func buttonClick() {
        self.output.agreeClick()
    }
    
}