//
//  ProgressView.swift
//  PrivadoVPN
//
//  Created by Juraldinio on 2/4/21.
//  Copyright © 2021 Privado LLC. All rights reserved.
//

import Foundation
import AppKit

final class ProgressView: View {
    
    private var progressView: NSView?
    private var remainingField: NSTextField?
    
    private var widthConstraint: NSLayoutConstraint?
    
    // MARK: - Interface
    
    var progressColor: NSColor = .clear {
        didSet {
            self.progressView?.viewBackgroundColor = self.progressColor
        }
    }
    
    var progress: CGFloat = 0.0 {
        didSet {
            guard self.progress >= 0 && self.progress <= 1.0 else { return }
            
            if let constraint = self.widthConstraint { NSLayoutConstraint.deactivate([constraint]) }
            
            guard let progressView = self.progressView else { return }
            
            let widthConstraint = progressView.widthAnchor.constraint(equalTo: self.widthAnchor, multiplier: self.progress)
            self.widthConstraint = widthConstraint
            
            NSLayoutConstraint.activate([widthConstraint])
        }
    }
    
    var textFont: NSFont? {
        didSet {
            self.remainingField?.font = self.textFont
        }
    }
    
    var text: String = "" {
        didSet {
            self.remainingField?.stringValue = self.text
        }
    }
    
    var textColor: NSColor = .clear {
        didSet {
            self.remainingField?.textColor = self.textColor
        }
    }
    
    // MARK: - Lifecycle
    
    override func addSubviews() {
        
        let view = NSView()
        self.progressView = view
        self.addSubview(view)
        
        let textField = NSTextField()
        textField.isBezeled = false
        textField.drawsBackground = false
        textField.isEditable = false
        textField.isSelectable = false
        textField.translatesAutoresizingMaskIntoConstraints = false
        textField.focusRingType = .none
        textField.alignment = .center
        self.remainingField = textField
        self.addSubview(textField)
        
    }
    
    override func addConstraints() {
        
        self.translatesAutoresizingMaskIntoConstraints = false
        
        
        guard let progressView = self.progressView
              , let remainingField = remainingField else {
            return
        }
        
        progressView.translatesAutoresizingMaskIntoConstraints = false
        remainingField.translatesAutoresizingMaskIntoConstraints = false

        let widthConstraint = progressView.widthAnchor.constraint(equalTo: self.widthAnchor, multiplier: 0.0)
        self.widthConstraint = widthConstraint
        
        NSLayoutConstraint.activate([
            remainingField.centerYAnchor.constraint(equalTo: self.centerYAnchor),
            remainingField.leadingAnchor.constraint(equalTo: self.leadingAnchor),
            remainingField.trailingAnchor.constraint(equalTo: self.trailingAnchor),
            // remainingField.heightAnchor.constraint(equalTo: self.heightAnchor, multiplier: 0.8),
            //
            progressView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
            progressView.topAnchor.constraint(equalTo: self.topAnchor),
            progressView.bottomAnchor.constraint(equalTo: self.bottomAnchor),
            widthConstraint
        ])
        
    }
    
}