//
//  ConnectionView.swift
//  Privado
//
//  Created by Jura on 10/10/19.
//  Copyright © 2019 Omicronmedia. All rights reserved.
//

import Foundation
import UIKit

protocol ConnectionViewInput: AnyObject {
    func state(text: String, colorState: ConnectionViewColorState, allowClick: Bool)
}

protocol ConnectionViewOutput: AnyObject {
    func isReady()
    func connectionClicked()
}

final class ConnectionView: View, ConnectionViewInput {
    
    private enum Constants {
        enum ImageName {
            static let background = "connection.background"
            static let ellipse = "connection.ellipse"
        }
        enum Geometry {
            static let viewSize = UIScreen.main.bounds.height
            static let bgWidthMultiplier: CGFloat = UIScreen.main.bounds.height >= 736 ? 0.5 : 0.4
            static let logoWidthMultiplier: CGFloat = 0.56
            static let ellipseWidthMultiplier: CGFloat = 0.65
        }
        
        static let colorConnected = UIColor(rgb: 0x28d799)
        static let colorProgress = UIColor(red: 1, green: 0.7690353394, blue: 0.2566133142, alpha: 1)
        static let colorDisconnected = UIColor(rgb: 0xe43b69)
        static let colorError = UIColor(rgb: 0xe43b69)
        
        static let titleFont = UIFont(name: "SFProText-Black", size: UIScreen.main.bounds.height >= 736 ? 23 : 20)
    }
    
    private let output: ConnectionViewOutput
    
    private var tapBackground: UIView?
    private var backgroundImageView: UIImageView?
    private var connectionImageInput: ConnectionLogoInput?
    private var connectionImage: UIView?
    private var titleLabel: UILabel?
     
    // MARK: - Init
    
    init(output: ConnectionViewOutput) {
        self.output = output
        super.init(frame: .zero)
    }
    
    override func didMoveToSuperview() {
        super.didMoveToSuperview()
        
        self.output.isReady()
    }
    
    // MARK: - View
    
    override func setup() {
        
        self.translatesAutoresizingMaskIntoConstraints = false
        self.action = self.onClick
        
        super.setup()
    }
    
    override func addSubviews() {
        super.addSubviews()
        
        self.tapBackground = self.initializeBackgroundView()
        self.backgroundImageView = self.initializeBackgroundImageView()
        let imageView = self.initializeImageView()
        self.connectionImage = imageView
        self.titleLabel = self.initializeTitle()
    }
    
    override func addConstraints() {
        super.addConstraints()
        
        guard let backgroundImageView = self.backgroundImageView
              , let background = self.tapBackground
              , let logotype = self.connectionImage
              , let label = self.titleLabel else {
            return
        }
        NSLayoutConstraint.activate([
            background.centerXAnchor.constraint(equalTo: self.centerXAnchor),
            background.centerYAnchor.constraint(equalTo: self.centerYAnchor),
            background.heightAnchor.constraint(equalToConstant: Constants.Geometry.viewSize),
            background.widthAnchor.constraint(equalToConstant: Constants.Geometry.viewSize),
            backgroundImageView.topAnchor.constraint(equalTo: self.topAnchor),
            backgroundImageView.centerXAnchor.constraint(equalTo: self.centerXAnchor),
            backgroundImageView.widthAnchor.constraint(equalTo: self.widthAnchor,
                                                       multiplier: Constants.Geometry.bgWidthMultiplier),
            backgroundImageView.heightAnchor.constraint(equalTo: backgroundImageView.widthAnchor),
            
            logotype.centerXAnchor.constraint(equalTo: backgroundImageView.centerXAnchor),
            logotype.centerYAnchor.constraint(equalTo: backgroundImageView.centerYAnchor),
            logotype.widthAnchor.constraint(equalTo: backgroundImageView.widthAnchor,
                                            multiplier: Constants.Geometry.logoWidthMultiplier),
            logotype.heightAnchor.constraint(equalTo: logotype.widthAnchor),
            label.topAnchor.constraint(equalTo: backgroundImageView.bottomAnchor),
            label.leadingAnchor.constraint(equalTo: self.leadingAnchor),
            label.trailingAnchor.constraint(equalTo: self.trailingAnchor),
            label.bottomAnchor.constraint(equalTo: self.bottomAnchor)
        ])
    }
    
    // MARK: - UI
    
    private func initializeBackgroundImageView() -> UIImageView {
        let image = UIImage(imageLiteralResourceName: Constants.ImageName.background)
        let view = UIImageView(image: image)
        view.translatesAutoresizingMaskIntoConstraints = false
        
        let ellipseImage = UIImage(imageLiteralResourceName: Constants.ImageName.ellipse)
        let ellipseView = UIImageView(image: ellipseImage)
        ellipseView.translatesAutoresizingMaskIntoConstraints = false
        
        view.addSubview(ellipseView)
        NSLayoutConstraint.activate([
            ellipseView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            ellipseView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            ellipseView.widthAnchor.constraint(equalTo: view.widthAnchor,
                                               multiplier: Constants.Geometry.ellipseWidthMultiplier),
            ellipseView.heightAnchor.constraint(equalTo: ellipseView.widthAnchor)
        ])
        
        self.addSubview(view)
        return view
    }
    
    private func initializeBackgroundView() -> UIView {
        let backgroundView = UIView()
        backgroundView.isUserInteractionEnabled = true
        backgroundView.translatesAutoresizingMaskIntoConstraints = false
        let gesture = UITapGestureRecognizer(target: self, action: #selector(didTapBackground))
        backgroundView.addGestureRecognizer(gesture)
        self.addSubview(backgroundView)
        return backgroundView
    }
    @objc func didTapBackground() {
        self.connectionImageInput?.didTapPastClickZone()
    }
    
    private func initializeImageView() -> UIView {
        let logotype = ConnectionLogo()
        self.connectionImageInput = logotype
        logotype.isHidden = true
        logotype.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(logotype)

        return logotype
    }
    
    private func initializeTitle() -> UILabel {
        let label = UILabel()
        
        label.translatesAutoresizingMaskIntoConstraints = false
        label.font = Constants.titleFont
        label.textAlignment = .center
        label.numberOfLines = 0
        self.addSubview(label)
        
        return label
    }
    
    // MARK: - Private
    
    @objc
    private func onClick() {
        self.output.connectionClicked()
    }
    
    // MARK: - ConnectionViewInput
    
    func state(text: String, colorState: ConnectionViewColorState, allowClick: Bool) {
        
        self.isUserInteractionEnabled = allowClick
        
        self.connectionImage?.isHidden = false

        self.titleLabel?.text = text.uppercased()

        self.connectionImageInput?.update(state: colorState)
        
        let color: UIColor
        switch colorState {
        case .connected: color = Constants.colorConnected
        case .connecting, .disconnecting: color = Constants.colorProgress
        case .disconnected: color = Constants.colorDisconnected
        case .error: color = Constants.colorError
        }
        self.titleLabel?.textColor = color
    }
}