//
//  Button.swift
//  PrivadoVPN
//
//  Created by Zhandos Bolatbekov on 03.06.2021.
//  Copyright © 2021 Privado LLC. All rights reserved.
//

import UIKit

class Button: UIButton {
    
    typealias TouchAction = () -> Void
    
    // MARK: - Properties
    
    var cornerRadius: CGFloat = 12.0 {
        didSet {
            self.layer.cornerRadius = self.cornerRadius
        }
    }
    
    var touchUpInside: TouchAction?
    
    // MARK: - Initializers
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.addTarget(self, action: #selector(self.touchUpInside(sender:)), for: .touchUpInside)
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.addTarget(self, action: #selector(self.touchUpInside(sender:)), for: .touchUpInside)
    }
    
    convenience init(
        frame: CGRect = .zero,
        icon: UIImage? = nil,
        pressedIconColor: UIColor? = nil,
        text: String? = nil,
        textColor: UIColor? = .blue,
        pressedTextColor: UIColor? = nil,
        font: UIFont = .systemFont(ofSize: 17),
        backgroundColor: UIColor = .clear,
        pressedColor: UIColor? = nil,
        disabledColor: UIColor? = nil,
        cornerRadius: CGFloat = 0,
        borderWidth: CGFloat = 0,
        borderColor: UIColor = .clear
    ) {
        self.init(frame: frame)
        
        let allControllStates: [UIControl.State] = [
            .normal, .highlighted, .disabled, .selected, .focused, .application, .reserved
        ]
        for state in allControllStates {
            let text = text ?? ""
            let attributedTitle = NSMutableAttributedString(string: text)
            attributedTitle.addAttribute(.foregroundColor, value: textColor ?? .blue, range: text.getNSRange(of: text))
            if let icon = icon {
                let textAttachment = NSTextAttachment()
                let iconRect = CGRect(
                    x: 0,
                    y: (font.capHeight - icon.size.height).rounded() / 2,
                    width: icon.size.width,
                    height: icon.size.height
                )
                textAttachment.bounds = iconRect
                textAttachment.image = icon.withRenderingMode(.alwaysTemplate)
                attributedTitle.append(NSAttributedString(string: "  "))
                attributedTitle.append(NSAttributedString(attachment: textAttachment))
            }
            self.setAttributedTitle(attributedTitle, for: state)
        }
        self.setTitleColor(textColor, for: .normal)
        if let pressedTextColor = pressedTextColor {
            self.setTitleColor(pressedTextColor, for: .highlighted)
        }
        self.titleLabel?.adjustsFontSizeToFitWidth = true
        self.titleLabel?.font = font
        self.backgroundColor = backgroundColor
        if let disabledColor = disabledColor {
            setBackgroundImage(UIImage(ofColor: disabledColor), for: .disabled)
        }
        if let pressedColor = pressedColor {
            setBackgroundImage(UIImage(ofColor: pressedColor), for: .highlighted)
        }
        self.layer.borderColor = borderColor.cgColor
        self.layer.borderWidth = borderWidth
        self.layer.cornerRadius = cornerRadius
        self.clipsToBounds = cornerRadius > 0
        self.cornerRadius = cornerRadius
        self.translatesAutoresizingMaskIntoConstraints = false
    }
    
    // MARK: - Private
    
    @objc
    private func touchUpInside(sender: Button) {
        self.touchUpInside?()
    }
}