//
//  CredentialsViewIPAD.swift
//  PrivadoVPN
//
//  Created by Lizaveta Malinouskaya on 25.10.21.
//  Copyright © 2021 Privado LLC. All rights reserved.
//

import UIKit

class CredentialsViewIPAD: BaseView {
    
    // MARK: - Constant
    enum Constant {
        enum Geometry {
            static let viewRadius: CGFloat = 16
            static let buttonSize = CGSize(width: 464, height: 70)
            static let centerShift: CGFloat = 4
            static let promptLeading: CGFloat = 29
            static let credentialLeading: CGFloat = 188
            static let copyButtonTrailing: CGFloat = 13
            static let distanceBetweenViews: CGFloat = 1.47
        }
        enum Color {
            static let buttonBg = Colors.Base.primaryDarkBlue.color
            static let credentialsText = Colors.SystemCTA.green.color
            static let baseText = Colors.basicText.color
        }
        enum Image {
            static let copy = UIImage(named: "credentials.copy")
        }
        enum Font {
            static let text = UIFont.primary(size: 22, weight: .regular)
        }
        enum LocalizedString {
            static let password = NSLocalizedString("credentials.password", comment: "Password")
            static let username = NSLocalizedString("credentials.username", comment: "Username")
        }
    }
    
    // MARK: - Property
    var usernameButton: UIView?
    var passwordButton: UIView?
    let output: CredentialsControllerOutput
    
    enum CredentialLabelType {
        case prompt(isUsername: Bool)
        case credential(isUsername: Bool)
    }
    
    // MARK: - Init
    public init(with output: CredentialsControllerOutput) {
        self.output = output
        super.init()

        self.setupUI()
        self.layoutEmitter.addReaction { [weak self] isLandscape -> ShouldContinueReceiveNotifications in
            guard let self = self else { return false }
            self.setRoundCorners(isLandscape: isLandscape)
            return true
        }
    }
    
    // MARK: - UI
    
    private func setupUI() {
        self.translatesAutoresizingMaskIntoConstraints = false
        self.usernameButton = self.setupUsernameView(with: self)
        self.passwordButton = self.setupPasswordView(with: self)
        guard let usernameView = self.usernameButton,
              let passwordView = self.passwordButton else { return }
        self.portraitConstraints.append(contentsOf: [
            self.heightAnchor.constraint(equalToConstant: 2 * Constant.Geometry.buttonSize.height),
            usernameView.centerXAnchor.constraint(equalTo: self.centerXAnchor),
            usernameView.topAnchor.constraint(equalTo: self.topAnchor),
            passwordView.centerXAnchor.constraint(equalTo: self.centerXAnchor),
            passwordView.topAnchor.constraint(equalTo: usernameView.bottomAnchor, constant: Constant.Geometry.distanceBetweenViews)
        ])
        self.landscapeConstraints.append(contentsOf: [
            self.heightAnchor.constraint(equalToConstant: Constant.Geometry.buttonSize.height),
            usernameView.centerYAnchor.constraint(equalTo: self.centerYAnchor),
            usernameView.trailingAnchor.constraint(equalTo: self.centerXAnchor, constant: -5),
            passwordView.centerYAnchor.constraint(equalTo: self.centerYAnchor),
            passwordView.leadingAnchor.constraint(equalTo: self.centerXAnchor, constant: 5)
        ])
    }
    
    private func setupUsernameView(with container: UIView) -> UIView {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = Constant.Color.buttonBg
        let prompt = self.createLabel(of: .prompt(isUsername: true), container: view)
        let username = self.createLabel(of: .credential(isUsername: true), container: view)
        let copyButton = self.createCopyButton(container: view)
        copyButton.addTarget(self, action: #selector(self.didTapCopyUsername), for: .touchUpInside)
        self.setupCredentialViewConstraints(view: view, promptLabel: prompt, credentialLabel: username, copyButton: copyButton)
        container.addSubview(view)
        return view
    }
    
    private func setupPasswordView(with container: UIView) -> UIView {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = Constant.Color.buttonBg
        let prompt = self.createLabel(of: .prompt(isUsername: false), container: view)
        let username = self.createLabel(of: .credential(isUsername: false), container: view)
        let copyButton = self.createCopyButton(container: view)
        copyButton.addTarget(self, action: #selector(self.didTapCopyPassword), for: .touchUpInside)
        self.setupCredentialViewConstraints(view: view, promptLabel: prompt, credentialLabel: username, copyButton: copyButton)
        container.addSubview(view)
        return view
    }
    
    private func setupCredentialViewConstraints(view: UIView, promptLabel: UIView, credentialLabel: UIView, copyButton: UIButton) {
        NSLayoutConstraint.activate([
            view.heightAnchor.constraint(equalToConstant: Constant.Geometry.buttonSize.height),
            view.widthAnchor.constraint(equalToConstant: Constant.Geometry.buttonSize.width),
            
            promptLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: Constant.Geometry.centerShift),
            promptLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: Constant.Geometry.promptLeading),
            
            credentialLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: Constant.Geometry.centerShift),
            credentialLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: Constant.Geometry.credentialLeading),
            
            copyButton.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            copyButton.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -Constant.Geometry.copyButtonTrailing)
        ])
    }
    
    private func createLabel(of type: CredentialLabelType, container: UIView) -> UIView {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.font = Constant.Font.text
        switch type {
        case .prompt(let isUsername):
            label.textColor = Constant.Color.baseText
            label.text = isUsername
                ? Constant.LocalizedString.username
                : Constant.LocalizedString.password
        case .credential(let isUsername):
            label.textColor = Constant.Color.credentialsText
            label.text = isUsername
                ? output.username
                : output.password
        }
        container.addSubview(label)
        return label
    }
    
    private func createCopyButton(container: UIView) -> UIButton {
        let button = UIButton()
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setImage(Constant.Image.copy, for: .normal)
        container.addSubview(button)
        return button
    }
    
    private func setRoundCorners(isLandscape: Bool) {
        guard let passwordView = self.passwordButton,
              let usernameView = self.usernameButton else { return }
        
        let radius = Constant.Geometry.viewRadius
        let passwordCorners: UIRectCorner = [UIRectCorner.bottomLeft, UIRectCorner.bottomRight]
        let usernameCorners: UIRectCorner = [UIRectCorner.topLeft, UIRectCorner.topRight]
        let allCorners = UIRectCorner.allCorners
        
        if isLandscape {
            passwordView.layer.mask = self.createMask(for: passwordView, roundingCorners: allCorners, radius: radius)
            usernameView.layer.mask = self.createMask(for: usernameView, roundingCorners: allCorners, radius: radius)
        } else {
            passwordView.layer.mask = self.createMask(for: passwordView, roundingCorners: passwordCorners, radius: radius)
            usernameView.layer.mask = self.createMask(for: usernameView, roundingCorners: usernameCorners, radius: radius)
        }
    }
    
    private func createMask(for view: UIView, roundingCorners: UIRectCorner, radius: CGFloat) -> CAShapeLayer {
        let path = UIBezierPath(roundedRect: view.bounds, byRoundingCorners: roundingCorners, cornerRadii: CGSize(width: radius, height: radius))
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        return mask
    }
    
    // MARK: - objc methods
    
    @objc func didTapCopyUsername() {
        UINotificationFeedbackGenerator().notificationOccurred(.success)
        UIPasteboard.general.string = self.output.username
    }
    
    @objc func didTapCopyPassword() {
        UINotificationFeedbackGenerator().notificationOccurred(.success)
        UIPasteboard.general.string = self.output.password
    }
    
}