//
//  TextEntryField.swift
//  VDS
//
//  Created by Matt Bruce on 10/3/22.
//

import Foundation
import UIKit
import VDSColorTokens
import VDSFormControlsTokens
import Combine

public enum TextEntryFieldType: String, CaseIterable {
    case text, number, calendar, inlineAction, password, creditCard, tel, date, securityCode
}

@objc(VDSTextEntryField)
public class TextEntryField: TextEntryFieldBase{}

open class TextEntryFieldBase: EntryField {
    //--------------------------------------------------
    // 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: - Private Properties
    //--------------------------------------------------
     internal var containerStackView: UIStackView = {
        return UIStackView().with {
            $0.translatesAutoresizingMaskIntoConstraints = false
            $0.axis = .horizontal
            $0.distribution = .fill
            $0.spacing = 12
        }
    }()
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
 
    open var type: TextEntryFieldType = .text { didSet { didChange() }}

    open var showSuccess: Bool = false { didSet { didChange() }}
    
    open override var state: UIControl.State {
        get {
            var state = super.state
            if showSuccess {
                state.insert(.success)
            }
            return state
        }
    }
    
    open var successText: String? { didSet { didChange() }}
        
    open var helperTextPlacement: HelperTextPlacement = .bottom { didSet { didChange() }}

    private var successLabel = Label().with {
        $0.setContentCompressionResistancePriority(.required, for: .vertical)
        $0.textPosition = .left
        $0.typograpicalStyle = .BodySmall
    }
    
    internal var minWidthConstraint: NSLayoutConstraint?
    
    //--------------------------------------------------
    // MARK: - Lifecycle
    //--------------------------------------------------
    open override func setup() {
        super.setup()
        
        minWidthConstraint = containerView.widthAnchor.constraint(greaterThanOrEqualToConstant: 0)
        minWidthConstraint?.isActive = true

        stackView.addArrangedSubview(successLabel)
        stackView.setCustomSpacing(8, after: successLabel)
        
        successLabel.textColorConfiguration = primaryColorConfig.eraseToAnyColorable()
        
    }
    
    public override func reset() {
        super.reset()
        successLabel.reset()
        successLabel.textPosition = .left
        successLabel.typograpicalStyle = .BodySmall
        
        type = .text
        showSuccess = false
        successText = nil
        helperTextPlacement = .bottom
    }
    
    open override func getContainer() -> UIView {
        containerStackView.addArrangedSubview(containerView)
        return containerStackView
    }

    open override func getBackgroundConfig() -> AnyColorable {
        return TextEntryFieldColorConfiguration().with {
            $0.enabled.lightColor = VDSFormControlsColor.backgroundOnlight
            $0.enabled.darkColor = VDSFormControlsColor.backgroundOndark
            $0.disabled.lightColor = VDSFormControlsColor.backgroundOnlight
            $0.disabled.darkColor = VDSFormControlsColor.backgroundOndark
            
            //error/success doesn't care enabled/disable
            $0.error.lightColor = VDSColor.feedbackErrorBackgroundOnlight
            $0.error.darkColor = VDSColor.feedbackErrorBackgroundOndark
            $0.success.lightColor = VDSColor.feedbackSuccessBackgroundOnlight
            $0.success.darkColor = VDSColor.feedbackSuccessBackgroundOndark
        }.eraseToAnyColorable()
    }
    
    open override func getBorderConfig() ->  AnyColorable {
        return TextEntryFieldColorConfiguration().with {
            $0.enabled.lightColor = VDSFormControlsColor.borderOnlight
            $0.enabled.darkColor = VDSFormControlsColor.borderOnlight
            $0.disabled.lightColor = VDSColor.interactiveDisabledOnlight
            $0.disabled.darkColor = VDSColor.interactiveDisabledOndark
            
            //error/success doesn't care enabled/disable
            $0.error.lightColor = VDSColor.feedbackErrorOnlight
            $0.error.darkColor = VDSColor.feedbackErrorOndark
            $0.success.lightColor = VDSColor.feedbackSuccessOnlight
            $0.success.darkColor = VDSColor.feedbackSuccessOndark
        }.eraseToAnyColorable()
    }
    
    //--------------------------------------------------
    // MARK: - State
    //--------------------------------------------------
    open override func updateView() {
        super.updateView()
        
        //show error or success
        if showError, let _ = errorText {
            successLabel.isHidden = true
            
        } else if showSuccess, let successText {
            successLabel.text = successText
            successLabel.surface = surface
            successLabel.disabled = disabled
            successLabel.isHidden = false
            errorLabel.isHidden = true
            
        } else {
            successLabel.isHidden = true
            
        }
                
        //set the width constraints
        if let width, width > type.width  {
            widthConstraint?.constant = width
            widthConstraint?.isActive = true
            minWidthConstraint?.isActive = false
        } else {
            minWidthConstraint?.constant = type.width
            widthConstraint?.isActive = false
            minWidthConstraint?.isActive = true
        }
    }
    
    open override func updateHelperLabel(){
        //remove first
        helperLabel.removeFromSuperview()
        
        super.updateHelperLabel()

        //set the helper label position
        if helperText != nil {
            if helperTextPlacement == .right {
                containerStackView.spacing = 12
                containerStackView.distribution = .fillEqually
                containerStackView.addArrangedSubview(helperLabel)
            } else {
                containerStackView.spacing = 0
                containerStackView.distribution = .fill
                stackView.addArrangedSubview(helperLabel)
            }
        }
    }
    
    internal class TextEntryFieldColorConfiguration: DisabledSurfaceColorable {
        var success = SurfaceColorConfiguration()
        var error = SurfaceColorConfiguration()
        var disabled = SurfaceColorConfiguration()
        var enabled = SurfaceColorConfiguration()

        required init(){}
        
        func getColor(_ object: TextEntryField) -> UIColor {
            //only show error is enabled and showError == true
            let showErrorColor = !object.disabled && object.showError
            let showSuccessColor = !object.disabled && object.showSuccess

            if showErrorColor {
                return error.getColor(object)
                
            } else if showSuccessColor {
                return success.getColor(object)
                
            } else {
                return getDisabledColor(object)
            }
        }
    }

}

extension TextEntryFieldType {
    var width: CGFloat {
        switch self {
        case .inlineAction:
            return 102
        case .password:
            return 62.0
        case .creditCard:
            return 288.0
        case .tel:
            return 176.0
        case .date:
            return 114.0
        case .securityCode:
            return 88.0
        default:
            return 40.0
        }
    }
}