//
//  Test.swift
//  VDSSample
//
//  Created by Matt Bruce on 5/21/24.
//

import Foundation
import UIKit
import VDS
import VDSTokens
import Combine

class  TestViewController: BaseViewController<EntryFieldBase2> {
            
  
    
    lazy var helperTextPositionPickerSelectorView = {
        PickerSelectorView(title: "",
                            picker: self.picker,
                           items: EntryFieldBase2.HelperTextPlacement.allCases)
    }()
    
    var labelTextField = TextField()
    var errorTextField = TextField()
    var successTextField = TextField()
    var helperTextField = TextField()
    var showErrorSwitch = Toggle()
    var showSuccessSwitch = Toggle()

    override func viewDidLoad() {
        super.viewDidLoad()
        addContentTopView(view: component)
        component.labelText = "Title For the Component Blah blah blah"
        component.errorText = "Error For the Component"
        component.helperText = "Helper For the Component"
        setupPicker()
        setupModel()
    }
    
    override func setupForm(){
        super.setupForm()
        let general = FormSection().with {
            $0.title = "\n\nGeneral Settings"
        }
        
        general.addFormRow(label: "Surface", view: surfacePickerSelectorView)
        general.addFormRow(label: "Label Text", view: labelTextField)
        general.addFormRow(label: "Helper Text Placement", view: helperTextPositionPickerSelectorView)
        general.addFormRow(label: "Helper Text", view: helperTextField)
        general.addFormRow(label: "Error", view: showErrorSwitch)
        general.addFormRow(label: "Error Text", view: errorTextField)
//        general.addFormRow(label: "Success", view: showSuccessSwitch)
//        general.addFormRow(label: "Success Text", view: successTextField)

        append(section: general)
        
        showErrorSwitch.onChange = { [weak self] sender in
            guard let self else { return }
            self.component.showError = sender.isOn
            if self.component.showError != sender.isOn {
                self.showErrorSwitch.isOn = self.component.showError
            }
        }
        
//        showSuccessSwitch.onChange = { [weak self] sender in
//            guard let self else { return }
//            self.component.showSuccess = sender.isOn
//            if self.component.showSuccess != sender.isOn {
//                self.showSuccessSwitch.isOn = self.component.showSuccess
//            }
//        }

        labelTextField
            .textPublisher
            .sink { [weak self] text in
                self?.component.labelText = text
            }.store(in: &subscribers)
        
        helperTextField
            .textPublisher
            .sink { [weak self] text in
                self?.component.helperText = text
            }.store(in: &subscribers)

        errorTextField
            .textPublisher
            .sink { [weak self] text in
                self?.component.errorText = text
            }.store(in: &subscribers)


    }
    
    func setupModel() {
        //setup UI
        surfacePickerSelectorView.text = component.surface.rawValue
        helperTextPositionPickerSelectorView.text = component.helperTextPlacement.rawValue
        labelTextField.text = component.labelText
        helperTextField.text = component.helperText
        errorTextField.text = component.errorText
    }
    
    func setupPicker(){

        surfacePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.surface = item
            self?.contentTopView.backgroundColor = item.color
        }
        
        helperTextPositionPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.helperTextPlacement = item
        }
    }
}

open class EntryFieldBase2: Control, Changeable, FormFieldInternalValidatable {
    
    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    required public init() {
        super.init(frame: .zero)
    }
    
    public override init(frame: CGRect) {
        super.init(frame: .zero)
    }
    
    public required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

    //--------------------------------------------------
    // MARK: - Enums
    //--------------------------------------------------
    /// Enum used to describe the position of the helper text.
    public enum HelperTextPlacement: String, CaseIterable {
        case bottom, right
    }
    
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    internal let mainStackView = UIStackView().with {
        $0.axis = .vertical
        $0.alignment = .fill
        $0.spacing = 8
        $0.translatesAutoresizingMaskIntoConstraints = false
    }
    
    internal let contentStackView = UIStackView().with {
        $0.axis = .vertical
        $0.alignment = .fill
        $0.distribution = .fill
        $0.spacing = 8
        $0.translatesAutoresizingMaskIntoConstraints = false
    }
    
    /// only used for helperTextPosition == .right
    internal let row1StackView = UIStackView().with {
        $0.axis = .horizontal
        $0.spacing = 8
        $0.alignment = .top
        $0.distribution = .fillEqually
    }
    
    /// only used for helperTextPosition == .right
    internal let row2StackView = UIStackView().with {
        $0.axis = .horizontal
        $0.spacing = 8
        $0.alignment = .top
        $0.distribution = .fillEqually
    }
    
    internal var fieldStackView: UIStackView = {
        return UIStackView().with {
            $0.translatesAutoresizingMaskIntoConstraints = false
            $0.axis = .horizontal
            $0.distribution = .fill
            $0.alignment = .top
        }
    }()
    
    /// This is a vertical stack used for the errorLabel and helperLabel.
    internal var bottomContainerStackView: UIStackView = {
        return UIStackView().with {
            $0.translatesAutoresizingMaskIntoConstraints = false
            $0.axis = .vertical
            $0.distribution = .fill
            $0.spacing = VDSLayout.space2X
        }
    }()
        
    /// This is the view that will be wrapped with the border for userInteraction.
    /// The only subview of this view is the fieldStackView
    internal var containerView: UIView = {
        return UIView().with {
            $0.translatesAutoresizingMaskIntoConstraints = false
        }
    }()
    
    /// This is set by a local method.
    internal var bottomContainerView: UIView!
    
    //--------------------------------------------------
    // MARK: - Configuration Properties
    //--------------------------------------------------
    // Sizes are from InVision design specs.
    internal var maxWidth: CGFloat { frame.size.width }
    internal var minWidth: CGFloat { containerSize.width }
    internal var containerSize: CGSize { CGSize(width: minWidth, height: 44) }
    
    internal let primaryColorConfiguration =  ViewColorConfiguration().with {
        $0.setSurfaceColors(VDSColor.interactiveDisabledOnlight, VDSColor.interactiveDisabledOndark, forDisabled: true)
        $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark, forDisabled: false)
    }
    
    internal let secondaryColorConfiguration = ViewColorConfiguration().with {
        $0.setSurfaceColors(VDSColor.interactiveDisabledOnlight, VDSColor.interactiveDisabledOndark, forDisabled: true)
        $0.setSurfaceColors(VDSColor.elementsSecondaryOnlight, VDSColor.elementsSecondaryOndark, forDisabled: false)
    }

    internal var backgroundColorConfiguration = ControlColorConfiguration().with {
        $0.setSurfaceColors(VDSFormControlsColor.backgroundOnlight, VDSFormControlsColor.backgroundOndark, forState: .normal)
        $0.setSurfaceColors(VDSFormControlsColor.backgroundOnlight, VDSFormControlsColor.backgroundOndark, forState: .disabled)
        $0.setSurfaceColors(VDSColor.feedbackErrorBackgroundOnlight, VDSColor.feedbackErrorBackgroundOndark, forState: .error)
        $0.setSurfaceColors(VDSColor.feedbackErrorBackgroundOnlight, VDSColor.feedbackErrorBackgroundOndark, forState: [.error, .focused])
    }

    internal var borderColorConfiguration = ControlColorConfiguration().with {
        $0.setSurfaceColors(VDSFormControlsColor.borderOnlight, VDSFormControlsColor.borderOndark, forState: .normal)
        $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOnlight, forState: .focused)
        $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOnlight, forState: [.focused, .error])
        $0.setSurfaceColors(VDSColor.interactiveDisabledOnlight, VDSColor.interactiveDisabledOndark, forState: .disabled)
        $0.setSurfaceColors(VDSColor.feedbackErrorOnlight, VDSColor.feedbackErrorOndark, forState: .error)
        $0.setSurfaceColors(VDSColor.interactiveDisabledOnlight, VDSColor.interactiveDisabledOndark, forState: [.disabled,.error])
    }
    
    internal let iconColorConfiguration =  ControlColorConfiguration().with {
        $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark, forState: .normal)
        $0.setSurfaceColors(VDSColor.interactiveDisabledOnlight, VDSColor.interactiveDisabledOndark, forState: .disabled)
        $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark, forState: .error)
    }

    internal var readOnlyBorderColorConfiguration = ControlColorConfiguration().with {
        $0.setSurfaceColors(VDSFormControlsColor.borderReadonlyOnlight, VDSFormControlsColor.borderReadonlyOndark, forState: .normal)
    }
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    open var onChangeSubscriber: AnyCancellable?

    open var titleLabel = Label().with {
        $0.setContentCompressionResistancePriority(.required, for: .vertical)
        $0.textStyle = .bodySmall
    }
    
    open var errorLabel = Label().with {
        $0.setContentCompressionResistancePriority(.required, for: .vertical)
        $0.textStyle = .bodySmall
        $0.accessibilityValue = "error"
    }
    
    open var helperLabel = Label().with {
        $0.setContentCompressionResistancePriority(.required, for: .vertical)
        $0.textStyle = .bodySmall
    }
    
    open var statusIcon: Icon = Icon().with {
        $0.size = .medium
    }
        
    open var labelText: String? { didSet { setNeedsUpdate() } }
    
    open var helperText: String? { didSet { setNeedsUpdate() } }
    
    /// Whether not to show the error.
    open var showError: Bool = false { didSet { setNeedsUpdate() } }
    
    /// FormFieldValidator
    open var validator: (any FormFieldValidatorable)?

    /// Override UIControl state to add the .error state if showError is true.
    open override var state: UIControl.State {
        get {
            var state = super.state
            if showError || hasInternalError {
                state.insert(.error)
            }
            return state
        }
    }
        
    open var errorText: String? { didSet { setNeedsUpdate() } }
            
    open var tooltipModel: Tooltip.TooltipModel? { didSet { setNeedsUpdate() } }
        
    open var transparentBackground: Bool = false { didSet { setNeedsUpdate() } }
    
    open var width: CGFloat? { didSet { setNeedsUpdate() } }
        
    open var inputId: String? { didSet { setNeedsUpdate() } }
        
    /// The text of this textField.
    open var value: String? {
        get { fatalError("must be read from subclass")}
    }
    
    open var defaultValue: AnyHashable? { didSet { setNeedsUpdate() } }
    
    open var isRequired: Bool = false { didSet { setNeedsUpdate() } }
    
    open var isReadOnly: Bool = false { didSet { setNeedsUpdate() } }

    open var helperTextPlacement: HelperTextPlacement = .bottom {
        didSet {
            updateHelperTextPosition()
        }
    }
        
    open var rules = [AnyRule<String>]()

    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------

    /// Called once when a view is initialized and is used to Setup additional UI or other constants and configurations.
    open override func setup() {
        super.setup()
        // Configure Labels
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
                      
        //add ContainerStackView
        //this is the horizontal stack that contains
        //the left, InputContainer, Icons, Buttons
        containerView.addSubview(fieldStackView)
        fieldStackView.pinToSuperView(.uniform(VDSLayout.space3X))

        let fieldContainerView = getFieldContainer()
        fieldContainerView.translatesAutoresizingMaskIntoConstraints = false
        
        //add the view to add input fields
        fieldStackView.addArrangedSubview(fieldContainerView)
        fieldStackView.addArrangedSubview(statusIcon)
        fieldStackView.setCustomSpacing(VDSLayout.space3X, after: fieldContainerView)

        //get the container this is what show helper text, error text
        //can include other for character count, max length
        bottomContainerView = getBottomContainer()

        //this is the vertical stack that contains error text, helper text
        bottomContainerStackView.addArrangedSubview(errorLabel)
        bottomContainerStackView.addArrangedSubview(helperLabel)
        
        // Add arranged subviews to textFieldStackView
        contentStackView.addArrangedSubview(containerView)
        contentStackView.addArrangedSubview(bottomContainerView)
       
        // Add arranged subviews to mainStackView
        mainStackView.addArrangedSubview(titleLabel)
        mainStackView.addArrangedSubview(contentStackView)
       
        // Add mainStackView to the view
        addSubview(mainStackView)
       
        mainStackView.pinToSuperView()
        
        // Initial position of the helper label
        updateHelperTextPosition()
        
        // Set the UIImageView as the left view of the UITextField
        let iconContainerView: UIView = UIView()
        iconContainerView.addSubview(creditCardImageView)
        creditCardImageView.pinToSuperView(.init(top: 0, left: 0, bottom: 0, right: 10))
        
        textField.leftView = iconContainerView
        textField.leftViewMode = .always
    }
    
    /// Updates the UI
    open override func updateView() {
        super.updateView()
        updateContainerView()
        updateTitleLabel()
        updateErrorLabel()
        updateHelperLabel()

        let imageName = InputField.CreditCardType.generic.imageName(surface: surface)
        creditCardImageView.image = BundleManager.shared.image(for: imageName)
    }
    
    /// Resets to default settings.
    open override func reset() {
        super.reset()
        titleLabel.reset()
        errorLabel.reset()
        helperLabel.reset()
        
        titleLabel.textStyle = .bodySmall
        errorLabel.textStyle = .bodySmall
        helperLabel.textStyle = .bodySmall

        labelText = nil
        helperText = nil
        showError = false
        errorText = nil
        tooltipModel = nil
        transparentBackground = false
        width = nil
        inputId = nil
        defaultValue = nil
        isRequired = false
        isReadOnly = false
        onChange = nil
    }

    //--------------------------------------------------
    // MARK: - Public Methods
    //--------------------------------------------------
    /// Container for the area in which the user interacts.
    open func getFieldContainer() -> UIView {
        return 2textField
        //fatalError("Subclass must return the view that contains the field/view the user will interact with.")
    }
   
    /// Container for the area in which helper or error text presents.
    open func getBottomContainer() -> UIView {
        return bottomContainerStackView
    }

    open func validate(){
        updateRules()
        validator = FormFieldValidator<EntryFieldBase2>(field: self, rules: rules)
        validator?.validate()
        setNeedsUpdate()
    }
        
    open func updateTitleLabel() {
               
        //update the local vars for the label since we no
        //long have a model
        var attributes: [any LabelAttributeModel] = []
        var updatedLabelText = labelText
        
        //dealing with the "Optional" addition to the text
        if let oldText = updatedLabelText, !isRequired, !oldText.hasSuffix("Optional")  {
            if isEnabled {
                let optionColorAttr = ColorLabelAttribute(location: oldText.count + 2,
                                                          length: 8,
                                                          color: VDSColor.elementsSecondaryOnlight)
                
                attributes.append(optionColorAttr)
            }
            updatedLabelText = "\(oldText)  Optional"
        }
        
        if let tooltipModel {
            attributes.append(TooltipLabelAttribute(surface: surface, model: tooltipModel, presenter: self))
        }

        //set the titleLabel
        titleLabel.text = updatedLabelText
        titleLabel.attributes = attributes
        titleLabel.surface = surface
        titleLabel.isEnabled = isEnabled
    }

    open func updateErrorLabel(){
        if showError, let errorText {
            errorLabel.text = errorText
            errorLabel.surface = surface
            errorLabel.isEnabled = isEnabled
            errorLabel.isHidden = false
            statusIcon.name = .error
            statusIcon.surface = surface
            statusIcon.isHidden = !isEnabled || state.contains(.focused)
        } else if hasInternalError, let internalErrorText {
            errorLabel.text = internalErrorText
            errorLabel.surface = surface
            errorLabel.isEnabled = isEnabled
            errorLabel.isHidden = false
            statusIcon.name = .error
            statusIcon.surface = surface
            statusIcon.isHidden = !isEnabled || state.contains(.focused)
        } else {
            statusIcon.isHidden = true
            errorLabel.isHidden = true
        }
        statusIcon.color = iconColorConfiguration.getColor(self)
    }
    
    open func updateHelperLabel(){
        //set the helper label position
        if let helperText {
            helperLabel.text = helperText
            helperLabel.surface = surface
            helperLabel.isEnabled = isEnabled
            helperLabel.isHidden = false
        } else {
            helperLabel.isHidden = true
        }
    }
    
    //--------------------------------------------------
    // MARK: - Private Methods
    //--------------------------------------------------
    internal func updateRules() {
        rules.removeAll()
        if self.isRequired {
            let rule = RequiredRule()
            if let errorText, !errorText.isEmpty {
                rule.errorMessage = errorText
            } else if let labelText{
                rule.errorMessage = "You must enter a \(labelText)"
            } else {
                rule.errorMessage = "You must enter a value"
            }
            rules.append(.init(rule))
        }
    }

    internal func updateContainerView()  {
        containerView.backgroundColor = backgroundColorConfiguration.getColor(self)
        containerView.layer.borderColor = borderColorConfiguration.getColor(self).cgColor
        containerView.layer.borderWidth = VDSFormControls.borderWidth
        containerView.layer.cornerRadius = VDSFormControls.borderRadius
    }
    
    internal func updateHelperTextPosition() {
        
        titleLabel.removeFromSuperview()
        helperLabel.removeFromSuperview()
        
        contentStackView.removeFromSuperview()
        mainStackView.removeArrangedSubviews()
        
        //rows for helper-right
        row1StackView.removeArrangedSubviews()
        row2StackView.removeArrangedSubviews()
        row1StackView.removeFromSuperview()
        row2StackView.removeFromSuperview()
        
        switch helperTextPlacement {
        case .bottom:
            //add helper back into the contentView
            bottomContainerStackView.addArrangedSubview(helperLabel)
            mainStackView.addArrangedSubview(titleLabel)
            mainStackView.addArrangedSubview(contentStackView)
            
        case .right:
            //first row
            row1StackView.addArrangedSubview(titleLabel)
            //add spacer
            row1StackView.addArrangedSubview(UIView())
            
            //second row
            row2StackView.addArrangedSubview(contentStackView)
            //add under spacer
            row2StackView.addArrangedSubview(helperLabel)
            
            //add 2 rows to vertical stack to create the grid
            mainStackView.addArrangedSubview(row1StackView)
            mainStackView.addArrangedSubview(row2StackView)
        }
    }
    
    internal let textField = VDS.TextField().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
    }
    
    internal var creditCardImageView = UIImageView().with {
        $0.height(20)
        $0.width(32)
        $0.isAccessibilityElement = false
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.contentMode = .scaleAspectFill
        $0.clipsToBounds = true
    }
}

extension UIStackView {
    public func removeArrangedSubviews() {
        arrangedSubviews.forEach { removeArrangedSubview($0) }
    }
}