//
//  RoundedSecuredTextField.swift
//  Cyberlock
//
//  Created by Jura on 8/31/19.
//  Copyright © 2019 Omicronmedia. All rights reserved.
//

import Foundation
import AppKit

final class RoundedSecuredTextField: NSSecureTextField, NSTextFieldDelegate {
    
    typealias EnterHandlerClosure = () -> Bool
    
    private struct Constants {
        static let cornerRadius: CGFloat = 13
        static let placeholderColor = NSColor(calibratedRed: 173 / 255, green: 179 / 255, blue: 210 / 255, alpha: 0.5)
        static let textColor = NSColor(calibratedRed: 173 / 255, green: 179 / 255, blue: 210 / 255, alpha: 1.0)
    }
    
    // MARK: - Properties
    
    var enterHandler: EnterHandlerClosure?
    
    var coloredPlaceHolder: String? {
        get {
            return self.placeholderAttributedString?.string
        }
        set {
            if let value = newValue
                , let font = self.font {
                let attrs = [NSAttributedString.Key.foregroundColor: Constants.placeholderColor,
                             NSAttributedString.Key.font: NSFont.systemFont(ofSize: font.pointSize)]
                self.placeholderAttributedString = NSAttributedString(string: value, attributes: attrs)
            } else {
                self.placeholderAttributedString = nil
            }
        }
    }
    
    // MARK: - Initializers
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
        self.isBezeled = false
        self.drawsBackground = false
        self.translatesAutoresizingMaskIntoConstraints = false
        self.focusRingType = .none
        self.textColor = Constants.textColor
        self.delegate = self
        if let font = self.font {
            self.font = NSFont(name: font.fontName, size: 12.0)
        }
        
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // MARK: - Methods
    
    func hightlight(with color: NSColor?) {
        
        guard let borderColor = color else {
            self.layer?.borderWidth = 0.0
            return
        }
        
        self.layer?.borderColor = borderColor.cgColor
        self.layer?.borderWidth = 1.0
        self.layer?.cornerRadius = Constants.cornerRadius
        
    }

    
    // MARK: - Lifecycle
    
    override class var cellClass: AnyClass? {
        get {
            return RoundedSecuredTextFieldCell.self
        }
        // swiftlint:disable unused_setter_value
        set { }
        // swiftlint:enable unused_setter_value
    }
    
    override func viewDidMoveToWindow() {
        if let textView = self.window?.fieldEditor(true, for: self) as? NSTextView {
            textView.insertionPointColor = Constants.textColor
        }
    }
    
    override func draw(_ dirtyRect: NSRect) {
        
        let size = self.bounds.size
        let blackOutlineFrame = NSRect(x: 0, y: 0, width: size.width, height: size.height - 1.0)
        let color = NSColor(calibratedRed: 45 / 255, green: 51 / 255, blue: 82 / 255, alpha: 1.0)
        
        let gradient = NSGradient(colors: [color])
        let path = NSBezierPath(roundedRect: blackOutlineFrame, xRadius: 13, yRadius: 13)
        gradient?.draw(in: path, angle: 90)
        
        super.draw(dirtyRect)
    }
    
    // MARK: - NSTextFieldDelegate
    
    func controlTextDidChange(_ obj: Notification) {
        self.hightlight(with: nil)
    }
    
    func control(_ control: NSControl, textView: NSTextView, doCommandBy commandSelector: Selector) -> Bool {
        
        if commandSelector == #selector(NSResponder.insertNewline(_:)) {
            
            guard let handler = self.enterHandler else { return true }
            return handler()
        }
        
        return false
    }
    
}