//
//  FeedItemViewController.swift
//  ReviewsFeed
//
//  Created by Dmitrii Ivanov on 21/07/2020.
//  Copyright © 2020 ING. All rights reserved.
//

import UIKit

final class FeedItemViewController: UIViewController {
    
    // MARK: Constants
    private let item: Review
    
    // MARK: Outlets
    private lazy var titleLabel = {
        let label = UILabel()

        label.font = UIFont.preferredFont(forTextStyle: .title3)
        label.numberOfLines = 0
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = item.title

        return label
    }()
    
    private lazy var authorLabel = {
        let label = UILabel()
        
        label.font = UIFont.preferredFont(forTextStyle: .headline)
        label.numberOfLines = 1
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = item.author

        return label
    }()
    
    private lazy var commentLabel = {
        let label = UILabel()
        
        label.font = UIFont.preferredFont(forTextStyle: .body)
        label.numberOfLines = 0
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = item.comment
        
        return label
    }()

    private lazy var ratingVersionLabel = {
        let label = UILabel()
        
        label.font = UIFont.preferredFont(forTextStyle: .subheadline)
        label.numberOfLines = 1
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = item.rating.appVersion
        
        return label
    }()
    
    // MARK: Initialisers
    init(_ item: Review) {
        self.item = item
        
        super.init(nibName: nil, bundle: nil)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // MARK: UIViewController
    override func viewDidLoad() {
        super.viewDidLoad()

        setView()
        setNavigationBar()
        setLayout()
    }
    
}

// MARK: - Helpers
private extension FeedItemViewController {
    
    // MARK: Functions
    func setLayout() {
        NSLayoutConstraint.activate([
            authorLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 8),
            authorLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -8),
            authorLabel.topAnchor.constraint(equalTo: ratingVersionLabel.bottomAnchor, constant: 8),
            authorLabel.heightAnchor.constraint(equalToConstant: 24),
            commentLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 8),
            commentLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -8),
            commentLabel.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 8),
            commentLabel.heightAnchor.constraint(greaterThanOrEqualToConstant: 24),
            ratingVersionLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 8),
            ratingVersionLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -8),
            ratingVersionLabel.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 8),
            ratingVersionLabel.heightAnchor.constraint(equalToConstant: 24),
            titleLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 8),
            titleLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -8),
            titleLabel.topAnchor.constraint(equalTo: authorLabel.bottomAnchor, constant: 8),
            titleLabel.heightAnchor.constraint(lessThanOrEqualToConstant: 72),
        ])
    }
    
    func setNavigationBar() {
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationController?.navigationBar.isTranslucent = true
        
        navigationItem.title = "#\(String(item.id))"
    }

    func setView() {
        view.backgroundColor = .white
        
        view.addSubview(ratingVersionLabel)
        view.addSubview(authorLabel)
        view.addSubview(titleLabel)
        view.addSubview(commentLabel)
    }
    
}

// MARK: - Previews
@available(iOS 17.0, *)
#Preview("Feed Item with a review") {
    UINavigationController(rootViewController: FeedItemViewController(.init(
        author: "Some author name here...",
        comment: "Some long, explanatory review comment goes here...",
        id: 1,
        rating: .init(stars: 3, appVersion: "v1.0.0"),
        title: "Some review title goes here..."
    )))
}