//
//  AdvancedTextField.swift
//  PrivadoVPN
//
//  Created by Juraldinio on 8/16/21.
//  Copyright © 2021 Privado LLC. All rights reserved.
//

import Foundation
import AppKit

protocol AdvancedTextFieldDelegate: AnyObject {
    func advancedTextFieldClick(on target: AdvancedTextField)
    func advancedTextFieldHover(on target: AdvancedTextField, isHover: Bool)
}

final class AdvancedTextField: NSTextField {

    weak var advancedDelegate: AdvancedTextFieldDelegate?
    
    var useHandCursor = false {
        didSet {
            self.window?.invalidateCursorRects(for: self)
        }
    }
    
    override var frame: NSRect {
        didSet {
            self.setupTrackingArea(enable: true)
        }
    }
    
    private var trackingArea: NSTrackingArea?
    
    // MARK: - Initializers
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        self.setup()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // MARK: - Private
    
    private func setup() {
        self.translatesAutoresizingMaskIntoConstraints = false
        self.isBezeled = false
        self.drawsBackground = false
        // self.backgroundColor = .clear
        self.isEditable = false
        self.isSelectable = false
        self.focusRingType = .none
        self.usesSingleLineMode = false
    }
    
    private func setupTrackingArea(enable: Bool) {
        
        if let trackingArea = self.trackingArea {
            self.removeTrackingArea(trackingArea)
        }
        
        guard enable else { return }
        
        let area = NSTrackingArea.init(rect: self.bounds,
                                       options: [NSTrackingArea.Options.mouseEnteredAndExited, NSTrackingArea.Options.activeAlways],
                                       owner: self,
                                       userInfo: nil)
        self.trackingArea = area
        self.addTrackingArea(area)
    }
    
    /// Always display a pointing-hand cursor
    override func resetCursorRects() {
        super.resetCursorRects()
        guard self.useHandCursor else { return }
        self.addCursorRect(self.bounds, cursor: NSCursor.pointingHand)
    }
    
    override func mouseDown(with event: NSEvent) {
        guard self.useHandCursor else { return }
        self.advancedDelegate?.advancedTextFieldClick(on: self)
    }
    
    override func mouseEntered(with event: NSEvent) {
        super.mouseEntered(with: event)
        self.advancedDelegate?.advancedTextFieldHover(on: self, isHover: true)
    }
    
    override func mouseExited(with event: NSEvent) {
        super.mouseExited(with: event)
        self.advancedDelegate?.advancedTextFieldHover(on: self, isHover: false)
    }
}