Sample/MVC/TicTacToe/Sources/LoggedOut/LoggedOutViewController.swift

//
//  Copyright (c) 2018. Uber Technologies
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

import SnapKit
import UIKit

class LoggedOutViewController: UIViewController {

    init(mutablePlayersStream: MutablePlayersStream) {
        self.mutablePlayersStream = mutablePlayersStream
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder _: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = UIColor.white
        let playerFields = buildPlayerFields()
        buildLoginButton(withPlayer1Field: playerFields.player1Field, player2Field: playerFields.player2Field)
    }

    // MARK: - Private

    private let mutablePlayersStream: MutablePlayersStream
    private var player1Field: UITextField?
    private var player2Field: UITextField?

    private func buildPlayerFields() -> (player1Field: UITextField, player2Field: UITextField) {
        let player1Field = UITextField()
        self.player1Field = player1Field
        player1Field.borderStyle = UITextField.BorderStyle.line
        view.addSubview(player1Field)
        player1Field.placeholder = "Player 1 name"
        player1Field.snp.makeConstraints { (maker: ConstraintMaker) in
            maker.top.equalTo(self.view).offset(100)
            maker.leading.trailing.equalTo(self.view).inset(40)
            maker.height.equalTo(40)
        }

        let player2Field = UITextField()
        self.player2Field = player2Field
        player2Field.borderStyle = UITextField.BorderStyle.line
        view.addSubview(player2Field)
        player2Field.placeholder = "Player 2 name"
        player2Field.snp.makeConstraints { (maker: ConstraintMaker) in
            maker.top.equalTo(player1Field.snp.bottom).offset(20)
            maker.left.right.height.equalTo(player1Field)
        }

        return (player1Field, player2Field)
    }

    private func buildLoginButton(withPlayer1Field player1Field: UITextField, player2Field: UITextField) {
        let loginButton = UIButton()
        view.addSubview(loginButton)
        loginButton.snp.makeConstraints { (maker: ConstraintMaker) in
            maker.top.equalTo(player2Field.snp.bottom).offset(20)
            maker.left.right.height.equalTo(player1Field)
        }

        loginButton.setTitle("Login", for: .normal)
        loginButton.setTitleColor(UIColor.white, for: .normal)
        loginButton.backgroundColor = UIColor.black
        loginButton.addTarget(self, action: #selector(didTapLoginButton), for: .touchUpInside)
    }

    @objc
    private func didTapLoginButton() {
        guard let player1Field = player1Field, let player2Field = player2Field else {
            return
        }
        mutablePlayersStream.update(player1: player1Field.text, player2: player2Field.text)
    }
}