//
//  RadioButton.swift
//  VDS
//
//  Created by Matt Bruce on 7/22/22.
//

import Foundation
import UIKit
import VDSColorTokens
import VDSFormControlsTokens

public class RadioButton: RadioButtonBase<DefaultRadioButtonModel>{}

open class RadioButtonBase<ModelType: RadioButtonModel>: SelectorBase<ModelType> {
    
    //--------------------------------------------------
    // MARK: - Configuration Properties
    //--------------------------------------------------
    public let radioButtonSize = CGSize(width: 20, height: 20)
    public let radioButtonSelectedSize = CGSize(width: 10, height: 10)

    private var radioButtonBackgroundColorConfiguration: RadioButtonErrorColorConfiguration = {
        return RadioButtonErrorColorConfiguration().with {
            //error doesn't care enabled/disable
            $0.error.forTrue.lightColor = VDSColor.elementsPrimaryOnlight
            $0.error.forTrue.darkColor = VDSColor.elementsPrimaryOndark
            $0.error.forFalse.lightColor = VDSColor.feedbackErrorBackgroundOnlight
            $0.error.forFalse.darkColor = VDSColor.feedbackErrorBackgroundOndark
        }
    }()
    
    private var radioButtonBorderColorConfiguration: RadioButtonErrorColorConfiguration = {
        return RadioButtonErrorColorConfiguration().with {
            $0.forTrue.enabled.lightColor = VDSColor.elementsPrimaryOnlight
            $0.forTrue.enabled.darkColor = VDSColor.elementsPrimaryOndark
            $0.forFalse.enabled.lightColor = VDSFormControlsColor.borderOnlight
            $0.forFalse.enabled.darkColor = VDSFormControlsColor.borderOndark
            $0.forTrue.disabled.lightColor = VDSColor.interactiveDisabledOnlight
            $0.forTrue.disabled.darkColor = VDSColor.interactiveDisabledOndark
            $0.forFalse.disabled.lightColor = VDSColor.interactiveDisabledOnlight
            $0.forFalse.disabled.darkColor = VDSColor.interactiveDisabledOndark
            //error doesn't care enabled/disable
            $0.error.forTrue.lightColor = VDSColor.elementsPrimaryOnlight
            $0.error.forTrue.darkColor = VDSColor.elementsPrimaryOndark
            $0.error.forFalse.lightColor = VDSColor.feedbackErrorOnlight
            $0.error.forFalse.darkColor = VDSColor.feedbackErrorOndark
        }
    }()

    private var radioButtonCheckColorConfiguration: BinaryDisabledSurfaceColorConfiguration<ModelType> = {
        return BinaryDisabledSurfaceColorConfiguration<ModelType>().with {
            $0.forTrue.enabled.lightColor = VDSColor.elementsPrimaryOnlight
            $0.forTrue.enabled.darkColor = VDSColor.elementsPrimaryOndark
            $0.forTrue.disabled.lightColor = VDSColor.interactiveDisabledOnlight
            $0.forTrue.disabled.darkColor = VDSColor.interactiveDisabledOndark
        }
    }()
          
    open override func toggle() {
        guard !isSelected else { return }
        super.toggle()
    }
    
    //--------------------------------------------------
    // MARK: - RadioButton View
    //--------------------------------------------------
    /// Manages the appearance of the radioButton.
    private var shapeLayer: CAShapeLayer?
    open override func getSelectorSize() -> CGSize {
        return radioButtonSize
    }
    
    open override func updateSelector(_ viewModel: ModelType) {
        
        if let shapeLayer = shapeLayer, let sublayers = layer.sublayers, sublayers.contains(shapeLayer) {
            shapeLayer.removeFromSuperlayer()
            self.shapeLayer = nil
        }
        
        let bounds = selectorView.bounds
        let length = max(bounds.size.height, bounds.size.width)
        guard length > 0.0, shapeLayer == nil else { return }

        //get the colors
        let backgroundColor = radioButtonBackgroundColorConfiguration.getColor(viewModel)
        let borderColor = radioButtonBorderColorConfiguration.getColor(viewModel)
        let radioSelectedColor = radioButtonCheckColorConfiguration.getColor(viewModel)
        
        selectorView.backgroundColor = backgroundColor
        selectorView.layer.borderColor = borderColor.cgColor
        selectorView.layer.cornerRadius = selectorView.bounds.width * 0.5
        selectorView.layer.borderWidth = 1.0
        
        if shapeLayer == nil {
            let selectedBounds = radioButtonSelectedSize
            let bezierPath = UIBezierPath(ovalIn: CGRect(x: (bounds.width - selectedBounds.width) / 2,
                                                          y: (bounds.height - selectedBounds.height) / 2,
                                                         width: radioButtonSelectedSize.width,
                                                          height: radioButtonSelectedSize.height))
            let shapeLayer = CAShapeLayer()
            self.shapeLayer = shapeLayer
            shapeLayer.frame = bounds
            layer.addSublayer(shapeLayer)
            shapeLayer.fillColor = radioSelectedColor.cgColor
            shapeLayer.path = bezierPath.cgPath
        }
    }
        
    //--------------------------------------------------
    // MARK: - Color Class Configurations
    //--------------------------------------------------
    private class RadioButtonErrorColorConfiguration: BinaryDisabledSurfaceColorConfiguration<ModelType> {
        public let error = BinarySurfaceColorConfiguration<ModelType>()
        override func getColor(_ viewModel: ModelType) -> UIColor {
            //only show error is enabled and showError == true
            let showErrorColor = !viewModel.disabled && viewModel.hasError
            
            if showErrorColor {
                return error.getColor(viewModel)
            } else {
                return super.getColor(viewModel)
            }
        }
    }

}