//
//  UIExpanderLabelv2.swift
//  TestingMore
//
//  Created by Richard Cumming on 21/07/2019.
//  Copyright © 2019 dracosveen's Studio. All rights reserved.
//

import UIKit

class UIExpanderLabelv2: UILabel {

    // MARK: fields
    private var button = UIButton(frame: CGRect(x: 0, y: 0, width: 65, height: 15))
    private var isExpanded = false
    private var internalLabel: UILabel?

    @IBInspectable var topInset: CGFloat = 5.0
    @IBInspectable var bottomInset: CGFloat = 5.0
    @IBInspectable var leftInset: CGFloat = 7.0
    @IBInspectable var rightInset: CGFloat = 7.0

    override func drawText(in rect: CGRect) {
        let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
        super.drawText(in: rect.inset(by: insets))
    }

    override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize
        return CGSize(width: size.width + leftInset + rightInset,
                      height: size.height + topInset + bottomInset)
    }

    override func didMoveToSuperview() {
        setupView()
    }

    // MARK: inti
    override init(frame: CGRect) {
        super.init(frame: frame)

    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    //MARK: private func
    private func setupView() {
        layer.cornerRadius = 5
        layer.masksToBounds = true

        numberOfLines = 3
        lineBreakMode = .byWordWrapping
        sizeToFit()

        internalLabel = self
        self.superview!.addSubview(button)
        setupButton()

    }

    private func setupButton() {
        button.addTarget(self, action: #selector(buttonTouched(sender:)), for: .touchUpInside)
        setButtonText(text: "more")

        button.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            button.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor, constant: 4),
            button.trailingAnchor.constraint(equalTo: layoutMarginsGuide.trailingAnchor, constant: 5),
            button.heightAnchor.constraint(equalToConstant: 15),
            button.widthAnchor.constraint(equalToConstant: 65)
            ])

        // gradient
        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = button.frame
        gradientLayer.colors = [internalLabel!.backgroundColor!.withAlphaComponent(0).cgColor, internalLabel!.backgroundColor!.withAlphaComponent(1).cgColor]
        gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
        gradientLayer.endPoint = CGPoint(x: 0.5, y: 1.0)

        //Use diffrent colors
        button.layer.addSublayer(gradientLayer)

    }

    @objc private func buttonTouched(sender: UIButton) {
        if isExpanded {
            isExpanded = false
            setButtonText(text: "more")
            numberOfLines = 3
            lineBreakMode = .byTruncatingTail
            sizeToFit()
        }
        else {
            numberOfLines = 0
            sizeToFit()

//            translatesAutoresizingMaskIntoConstraints = false
//            NSLayoutConstraint.activate([
//                heightAnchor.constraint(equalToConstant: frame.height + 25)
//                ])

            isExpanded = true
            setButtonText(text: "less")
        }

    }

    private func setButtonText(text: String) {

        let attributedString = NSAttributedString(
            string: NSLocalizedString(text, comment: ""),
            attributes:[
                NSAttributedString.Key.font :UIFont.systemFont(ofSize: 13.0),
                NSAttributedString.Key.foregroundColor : UIColor.blue,
            ])
        button.setAttributedTitle(attributedString, for: .normal)
        button.contentHorizontalAlignment = .right
        button.contentVerticalAlignment = .center

    }
}

//
//  ViewController.swift
//  TestingMore
//
//  Created by Richard Cumming on 15/07/2019.
//  Copyright © 2019 dracosveen's Studio. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

    }

    override func viewWillAppear(_ animated: Bool) {


    }

    override func viewDidAppear(_ animated: Bool) {
        let margins = view.layoutMarginsGuide

        let myView = UIExpanderLabelv2()
        myView.backgroundColor = .white
        view.addSubview(myView)



        myView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            myView.topAnchor.constraint(equalTo: margins.topAnchor, constant: 0),
            myView.leadingAnchor.constraint(equalTo: margins.leadingAnchor, constant: 0),
            myView.trailingAnchor.constraint(equalTo: margins.trailingAnchor, constant: 0)])

        myView.font = UIFont.systemFont(ofSize: 12)

        myView.text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
    }
}