//
//  Children.swift
//  VDS
//
//  Created by Matt Bruce on 7/25/23.
//

import Foundation
import UIKit

open class Children: View {
   
    public enum Mode {
        case textOnly
        case viewOnly
        case textViewOnly
        
        public var errorMessage: String {
            switch self {
            case .textOnly:
                return "Invalid type passed. Expected String."
            case .viewOnly:
                return "Invalid type passed. Expected a UIView."
            case .textViewOnly:
                return "Invalid type passed. Expected a UIView or String."
            }
        }
    }
    
    open var mode: Mode  = .textViewOnly
    
    open var child: Any? {
        didSet {
            updateChildView()
        }
    }
   
    open var textStyle: TextStyle? {
        didSet {
            updateChildView()
        }
    }
   
    open lazy var label: Label = {
        let lbl = Label()
        lbl.lineBreakMode = .byWordWrapping
        lbl.numberOfLines = 0
        lbl.layer.masksToBounds = true
        lbl.textAlignment = .left
        return lbl
    }()
   
    open var customSubview: UIView?

    private func updateChildView() {
        // Remove previous views if any
        label.removeFromSuperview()
        customSubview?.removeFromSuperview()

        guard let child else { return }
        
        var view: UIView? = nil

        switch mode {
            
        case .textOnly:
            if let string = child as? String {
                label.text = string
                if let textStyle = textStyle {
                    label.textStyle = textStyle
                }
                view = label
            }
        case .viewOnly:
            if let customView = child as? View {
                customSubview = customView
                view = customView
            }
        case .textViewOnly:
            if let customView = child as? View {
                customSubview = customView
                view = customView
            } else if let string = child as? String {
                label.text = string
                if let textStyle = textStyle {
                    label.textStyle = textStyle
                }
                view = label
            }
        }
        
        guard let unwrappedView = view else {
            print(mode.errorMessage)
            return
        }

        addSubview(unwrappedView)
        unwrappedView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            unwrappedView.topAnchor.constraint(equalTo: self.topAnchor),
            unwrappedView.bottomAnchor.constraint(equalTo: self.bottomAnchor),
            unwrappedView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
            unwrappedView.trailingAnchor.constraint(equalTo: self.trailingAnchor)
        ])
    }
}