//
//  TextField.swift
//  VDSSample
//
//  Created by Matt Bruce on 8/24/22.
//

import Foundation
import UIKit
import VDS
import VDSFormControlsTokens
import Combine

public class TextField: UITextField {
    
    public var isNumeric: Bool = false
    
    public var textPadding = UIEdgeInsets(
        top: 10,
        left: 10,
        bottom: 10,
        right: 10
    )
    
    public override init(frame: CGRect) {
        super.init(frame: frame)
        font = TextStyle.bodyLarge.font
        setup()
    }
        
    public required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    public func setup() {
        let keypadToolbar: UIToolbar = UIToolbar()
        
        // add a done button to the numberpad
        keypadToolbar.items=[
            UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.flexibleSpace, target: self, action: nil),
            UIBarButtonItem(title: "Done", style: UIBarButtonItem.Style.done, target: self, action: #selector(UITextField.resignFirstResponder))
        ]
        keypadToolbar.sizeToFit()
        
        // add a toolbar with a done button above the number pad
        inputAccessoryView = keypadToolbar
        keyboardType = .alphabet
        returnKeyType = .done
    }
    
    public override func textRect(forBounds bounds: CGRect) -> CGRect {
        layer.borderColor = UIColor.black.cgColor
        layer.borderWidth = VDSFormControls.widthBorder
        let rect = super.textRect(forBounds: bounds)
        return rect.inset(by: textPadding)
    }
    
    public override func editingRect(forBounds bounds: CGRect) -> CGRect {
        layer.borderColor = UIColor.black.cgColor
        layer.borderWidth = VDSFormControls.widthBorder
        let rect = super.editingRect(forBounds: bounds)
        return rect.inset(by: textPadding)
    }
}

public class NumericField: TextField {
    public override init(frame: CGRect) {
        super.init(frame: frame)
        isNumeric = true
    }
    
    public required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    public override func setup() {
        super.setup()
        keyboardType = .numberPad
    }
    
    public var number: NSNumber? {
        guard let text, let foundNumber = NumberFormatter().number(from: text) else { return nil }
        return foundNumber
    }
    
    public var numberPublisher: AnyPublisher<NSNumber?, Never> {
        publisher(for: .editingChanged)
            .map { _ in self.number ?? nil }
            .eraseToAnyPublisher()
    }

}