//
//  Notification.swift
//  VDS
//
//  Created by Nadigadda, Sumanth on 14/03/23.
//

import Foundation
import UIKit
import VDSColorTokens
import Combine

@objc(VDSNotification)
/// A VDS Component that will render a view with information
public class Notification: View {
        
    //--------------------------------------------------
    // MARK: - Enums
    //--------------------------------------------------
    
    public enum NotificationStyle: String, CaseIterable {
        case info, success, warning, error
        
        func styleIconName() -> Icon.Name {
            switch self {
            case .info:
                return .infoBold
            case .success:
                return .checkmarkAltBold
            case .warning:
                return .warningBold
            case .error:
                return .errorBold
            }
        }
    }
    
    public enum ButtonsPosition: String, CaseIterable {
        case bottom, right
    }
    
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    
    private var mainStackView = UIStackView().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.alignment = .top
        $0.axis = .horizontal
        $0.spacing = VDSLayout.Spacing.space2X.value
    }
    
    private var labelsView = UIStackView().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.alignment = .top
        $0.axis = .vertical
    }
    
    private var labelButtonView = UIStackView().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.alignment = .top
        $0.distribution = .fillEqually
        $0.axis = .vertical
        $0.spacing = VDSLayout.Spacing.space2X.value
    }
    
    private var edgeSpacing: CGFloat {
        return UIDevice.isIPad ? VDSLayout.Spacing.space5X.value : VDSLayout.Spacing.space4X.value
    }
    
    private var minViewHeight: CGFloat {
        return UIDevice.isIPad ? VDSLayout.Spacing.space16X.value : VDSLayout.Spacing.space12X.value
    }
    
    private var minContentHeight: CGFloat {
        return UIDevice.isIPad ? VDSLayout.Spacing.space5X.value : VDSLayout.Spacing.space4X.value
    }
    
    //--------------------------------------------------
    // MARK: - View Properties
    //--------------------------------------------------
    
    open var typeIcon = Icon().with {
        $0.name = .infoBold
    }
    
    open var closeButton = Icon().with {
        $0.name = .close
    }
    
    open var titleLabel = Label().with {
        $0.textStyle = .boldBodyLarge
    }
    
    open var subTitleLabel = Label().with {
        $0.textStyle = .bodyLarge
    }
    
    open var buttonsView = ButtonGroup().with {
        $0.buttonPosition = .left
    }
    
    //Text
    open var titleText: String = "" { didSet{didChange()}}
    
    open var subTitleText: String? { didSet{didChange()}}

    //Buttons
    open var primaryButtonModel: ButtonModel? { didSet{didChange()}}
    open var primaryButton =  Button().with {
        $0.size = .small
        $0.use = .secondary
    }
    
    open var secondaryButtonModel: ButtonModel? { didSet{didChange()}}
    open var secondaryButton =  Button().with {
        $0.size = .small
        $0.use = .secondary
    }
    
    open var onCloseClick: ((Notification)->())? {
        didSet {
            if let onCloseClick {
                onCloseSubscriber = closeButton
                    .publisher(for: UITapGestureRecognizer())
                    .sink { _ in
                        onCloseClick(self)
                    }
            } else {
                onCloseSubscriber = nil
            }
        }
    }
    internal var onCloseSubscriber: AnyCancellable?
    //--------------------------------------------------
    // MARK: - Properties
    //--------------------------------------------------
    
    open var type: NotificationStyle = .info { didSet{didChange()}}
    
    var _buttonPosition: ButtonsPosition = .bottom
    open var buttonPosition: ButtonsPosition {
        set {
            if !UIDevice.isIPad, newValue == .right { return }
            _buttonPosition = newValue
            buttonsView.buttonPosition = _buttonPosition == .right ? .center : .left
            didChange()
        }
        get { _buttonPosition }
    }
    
    //--------------------------------------------------
    // MARK: - Configuration
    //--------------------------------------------------
    private var backgroundColorConfiguration: AnyColorable = {
        let config = KeyedColorConfiguration<Notification, NotificationStyle>(keyPath: \.type)
        config.setSurfaceColors(VDSColor.feedbackInformationBackgroundOnlight, VDSColor.feedbackInformationBackgroundOndark, forKey: .info)
        config.setSurfaceColors(VDSColor.feedbackWarningBackgroundOnlight, VDSColor.feedbackWarningBackgroundOndark, forKey: .warning)
        config.setSurfaceColors(VDSColor.feedbackSuccessBackgroundOnlight, VDSColor.feedbackSuccessBackgroundOndark, forKey: .success)
        config.setSurfaceColors(VDSColor.feedbackErrorBackgroundOnlight, VDSColor.feedbackErrorBackgroundOndark, forKey: .error)
        return config.eraseToAnyColorable()
    }()
    
    private var textColorConfig = ViewColorConfiguration().with {
        $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark, forDisabled: false)
        $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark, forDisabled: true)
    }
 
    //--------------------------------------------------
    // 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: - Lifecycle
    //--------------------------------------------------
    
    open override func setup() {
        super.setup()
        addSubview(mainStackView)
        mainStackView.pinToSuperView(.init(top: edgeSpacing, left: edgeSpacing, bottom: edgeSpacing, right: edgeSpacing))
        
        NSLayoutConstraint.activate([
            heightAnchor.constraint(greaterThanOrEqualToConstant: minViewHeight),
            mainStackView.heightAnchor.constraint(greaterThanOrEqualToConstant: minContentHeight)
        ])
        
        mainStackView.addArrangedSubview(typeIcon)
        mainStackView.addArrangedSubview(labelButtonView)
        mainStackView.addArrangedSubview(closeButton)
                    
        //labels
        titleLabel.textColorConfiguration = textColorConfig.eraseToAnyColorable()
        subTitleLabel.textColorConfiguration = textColorConfig.eraseToAnyColorable()
    }
    
    open override func reset() {
        super.reset()
        
        titleLabel.reset()
        subTitleLabel.reset()
        buttonsView.reset()
        primaryButton.reset()
        secondaryButton.reset()
        
        type = .info
        typeIcon.name = .infoBold
        closeButton.name = .close
        buttonPosition = .bottom
    }
    
    //--------------------------------------------------
    // MARK: - State
    //--------------------------------------------------
    open override func updateView() {
        backgroundColor = backgroundColorConfiguration.getColor(self)
        updateIcons()
        updateLabels()
        updateButtons()
    }
    
    private func updateIcons() {
        let iconColor = surface == .dark ? Icon.Color.white : Icon.Color.black
        typeIcon.name = type.styleIconName()
        typeIcon.color = iconColor
        closeButton.color = iconColor
    }
    
    private func updateLabels() {
        titleLabel.surface = surface
        subTitleLabel.surface = surface
        
        if !titleText.isEmpty {
            titleLabel.text = titleText
            labelsView.addArrangedSubview(titleLabel)
        } else {
            titleLabel.removeFromSuperview()
        }
        
        if let subTitleText {
            subTitleLabel.text = subTitleText
            labelsView.addArrangedSubview(subTitleLabel)
        } else {
            subTitleLabel.removeFromSuperview()
        }

    }
    
    private func updateButtons() {
        var buttons: [Button] = []
        if let primaryButtonModel {
            primaryButton.text = primaryButtonModel.text
            primaryButton.surface = surface
            primaryButton.onClick = primaryButtonModel.onClick
            buttons.append(primaryButton)
        }
        
        if let secondaryButtonModel {
            secondaryButton.text = secondaryButtonModel.text
            secondaryButton.surface = surface
            secondaryButton.onClick = secondaryButtonModel.onClick
            buttons.append(secondaryButton)
        }
        
        if buttons.isEmpty {
            labelsView.setCustomSpacing(0, after: subTitleLabel)
            buttonsView.removeFromSuperview()
        } else {
            labelsView.setCustomSpacing(VDSLayout.Spacing.space3X.value, after: subTitleLabel)
            
            buttonsView.buttons = buttons
            labelButtonView.axis = buttonPosition == .bottom ? .vertical : .horizontal
            labelButtonView.addArrangedSubview(buttonsView)
            
            buttonsView
                .pinLeading()
                .pinTrailing()
        }
    }
}