//
//  TileContainerViewController.swift
//  VDSSample
//
//  Created by Matt Bruce on 12/16/22.
//

import Foundation
import UIKit
import VDS
import VDSCoreTokens
import Combine

class TileContainerViewController: BaseViewController<TileContainer> {
    
    lazy var colorPicker: UIColorPickerViewController = {
        let picker = UIColorPickerViewController()
        picker.delegate = self
        return picker
    }()
    
    lazy var backgroundColorPickerSelectorView = {
        PickerSelectorView(title: "white",
                           picker: self.picker,
                           items: BackgroundColor.allCases)
    }()
    
    lazy var imageFallbackColorPickerSelectorView = {
        SurfacePickerSelectorView(picker: self.picker)
    }()
    
    lazy var paddingPickerSelectorView = {
        PickerSelectorView(title: "16",
                           picker: self.picker,
                           items: Padding.allCases)
    }()
    
    lazy var scalingTypePickerSelectorView = {
        PickerSelectorView(title: "white",
                           picker: self.picker,
                           items: TileContainer.AspectRatio.allCases)
    }()
    
    lazy var backgroundEffectSelectorView = {
        PickerSelectorView(title: "none",
                           picker: self.picker,
                           items: BackgroundEffect.allCases)
    }()
    
    var gradientColorsFormStackView = FormSection().with { $0.isHidden = true }
    var backgroundColor: BackgroundColor = .secondary
    var padding: Padding = .padding4X
    var isLinkSwitch = Toggle()
    var clickableSwitch = Toggle()
    var showBackgroundImageSwitch = Toggle()
    var showBorderSwitch = Toggle()
    var showDropShadowSwitch = Toggle()
    var backgroundImage = UIImage(named: "backgroundTest")!
    var customPaddingRowView: UIView?
    var anyCancellable: AnyCancellable?
    
    var contentAreaBackgroundColorButton = Button().with { instance in
        instance.size = .small
        instance.use = .secondary
        instance.text = "Select"
    }
    
    var paddingTextField = NumericField().with {
        $0.placeholder = "Custom Padding"
    }
    
    var heightTextField = NumericField().with {
        $0.placeholder = "Minimum 100px else it will occupy full container"
    }
    var widthTextField = NumericField().with {
        $0.placeholder = "Minimum 100px else it will occupy full container"
    }
    
    var colorPickerType: ColorPickerType = .backgroundColor
    enum ColorPickerType {
        case backgroundColor, gradientColor1, gradientColor2, contentViewBackgroundColor
    }
    
    lazy var gradientColorView1: ColorPickerView<ColorPickerType> = {
        return .init(with: ColorPickerType.gradientColor1) { [weak self] picker in
            self?.colorPickerType = picker.pickerType
            self?.selectedColorTapped(picker)
        }
    }()
    
    lazy var gradientColorView2: ColorPickerView<ColorPickerType> = {
        return .init(with: ColorPickerType.gradientColor2) { [weak self] picker in
            self?.colorPickerType = picker.pickerType
            self?.selectedColorTapped(picker)
        }
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        addContentTopView(view: .makeWrapper(for: component))
        component.width = 300
        component.color = .secondary
        component.accessibilityLabel = "Tile Container"
        
        let level2View = View()
        level2View.backgroundColor = .purple
        
        let level3View = View()
        level3View.backgroundColor = .yellow
        level2View.addSubview(level3View)
        level3View.pinToSuperView(.uniform(15))

        let level2label = Label()
        level2label.text = "Level 3 Label"
        level2label.isAccessibilityElement = true
        level2label.accessibilityLabel = "Level 3 Accessible Label"
       
        level3View.addSubview(level2label)
        level2label.pinTop().pinLeading()
        
        let level3Button = Button()
        level3Button.setTitle("Level 3 Button", for: .normal)
        level3Button.isAccessibilityElement = true
        level3Button.accessibilityLabel = "Level 3 Accessible Button"
        
        level3View.addSubview(level3Button)
        level3Button.pinTop(anchor: level2label.bottomAnchor, constant: 5)
        level3Button.pinLeading()
       
        let level4View = View()
        level4View.backgroundColor = .green
        level3View.addSubview(level4View)
        level4View.pinTop(anchor: level3Button.bottomAnchor, constant: 10)
        level4View.pinLeading()
        level4View.pinBottom()
        level4View.pinTrailing()
       
        let level4Label = Label()
        level4Label.text = "Level 4 Label"
        level4Label.isAccessibilityElement = true
        level4Label.accessibilityLabel = "Level 4 Accessible Label"
        level4View.addSubview(level4Label)
        level4Label.pinTop().pinLeading()

        let level4Button = Button()
        level4Button.setTitle("Level 4 Button", for: .normal)
        level4Button.isAccessibilityElement = true
        level4Button.accessibilityLabel = "Level 4 Accessible Button"
        level4View.addSubview(level4Button)
        
        level4Button.pinTop(anchor: level4Label.bottomAnchor, constant: 5)
        level4Button.pinLeading().pinBottom()
        

        component.addContentView(level2View)
        setupPicker()
        setupModel()
    }
    
    override func setupForm(){
        super.setupForm()  
        formStackView.addArrangedSubview(Label().with {
            $0.textStyle = .boldBodyLarge
            $0.text = "This object does NOT reflect normal \"surface\" changes, all properties are maually set"
        })
        formStackView.addArrangedSubview(Label().with {
            $0.text = "For testing max width is limited to 85% of view's width & 65% view's height."
        })
        addFormRow(label: "Surface", view: surfacePickerSelectorView)
        addFormRow(label: "Is Link", view: isLinkSwitch)
        addFormRow(label: "Clickable", view: clickableSwitch)
        addFormRow(label: "Width", view: widthTextField)
        addFormRow(label: "Height", view: heightTextField)
        addFormRow(label: "Show Border", view: showBorderSwitch)
        addFormRow(label: "Show Drop Shadow", view: showDropShadowSwitch)
        addFormRow(label: "Background Color", view: backgroundColorPickerSelectorView)
        addFormRow(label: "Padding", view: paddingPickerSelectorView)
        customPaddingRowView = addFormRow(label: "Custom Padding", view: paddingTextField)
        customPaddingRowView?.isHidden = true
        let rowView = addFormRow(label: "Content area BG color(only for padding validation)", view: contentAreaBackgroundColorButton)
        if let rowView = rowView as? UIStackView {
            rowView.alignment = .top
        }
        addFormRow(label: "Aspect Ratio", view: scalingTypePickerSelectorView)
        addFormRow(label: "Background Image", view: showBackgroundImageSwitch)
        addFormRow(label: "Image Fallback Color", view: imageFallbackColorPickerSelectorView)
        addFormRow(label: "Background Effect", view: backgroundEffectSelectorView)
        //Gradient Section
        gradientColorsFormStackView.addFormRow(label: "Gradient Color1", view: gradientColorView1)
        gradientColorsFormStackView.addFormRow(label: "Gradient Color2", view: gradientColorView2)
        append(section: gradientColorsFormStackView)
        
        anyCancellable = paddingTextField.textPublisher.receive(on: RunLoop.main).sink { [weak self] value in
            if let value = Float(value) {
                self?.component.padding = .custom(CGFloat(value))
            }
        }

        isLinkSwitch.onChange = { [weak self] sender in
            guard let self else { return }
            self.component.accessibilityTraits = sender.isOn ? .link : .button
        }

        clickableSwitch.onChange = { [weak self] sender in
            guard let self else { return }
            if sender.isOn {
                self.component.onClick = { _ in
                    print("you click on me!")
                }
            } else {
                self.component.onClick = nil
            }
        }
        
        showBackgroundImageSwitch.onChange = { [weak self] sender in
            if let image = self?.backgroundImage, sender.isOn {
                self?.component.backgroundImage = image
            } else {
                self?.component.backgroundImage = nil
            }
        }

        showBorderSwitch.onChange = { [weak self] sender in
                self?.component.showBorder = sender.isOn
        }
        
        showDropShadowSwitch.onChange =  { [weak self] sender in
            self?.component.showDropShadow = sender.isOn
        }

        heightTextField
            .numberPublisher
            .sink { [weak self] number in
                guard let self else { return }
                if let value = number?.cgFloatValue, value >= 100 && value < self.view.frame.height * 0.65 {
                    self.component.height = value
                    self.component.layoutIfNeeded()
                }
            }.store(in: &subscribers)

        widthTextField
            .numberPublisher
            .sink { [weak self] number in
                guard let self else { return }
                if let value = number?.cgFloatValue, value >= 100 && value < self.view.frame.width * 0.85 {
                    self.component.width = value
                    self.component.layoutIfNeeded()
                }
            }.store(in: &subscribers)
    }
    
    func setupModel() {
        //setup UI
        surfacePickerSelectorView.text = component.surface.rawValue
        backgroundColorPickerSelectorView.text = backgroundColor.rawValue
        paddingPickerSelectorView.text = padding.rawValue
        scalingTypePickerSelectorView.text = component.aspectRatio.rawValue
        widthTextField.text = component.width != nil ? "\(component.width!)" : ""
        heightTextField.text = component.height != nil ? "\(component.height!)" : ""
    }
      
    func setupPicker(){
        
        surfacePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.surface = item
            self?.contentTopView.backgroundColor = item.color
        }
        
        backgroundColorPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            guard let self else { return }
            if let color = item.color {
                self.component.color = color
            } else {
                self.colorPickerType = .backgroundColor
                self.present(self.colorPicker, animated: true)
            }
        }
        
        backgroundEffectSelectorView.onPickerDidSelect = { [weak self] in
            guard let self else { return }
            if let effect = $0.effect {
                self.component.backgroundEffect = effect
                self.gradientColorsFormStackView.isHidden = true
                self.gradientColorView1.selectedColor = nil
                self.gradientColorView2.selectedColor = nil
            } else {
                self.colorPickerType = .gradientColor1
                self.gradientColorsFormStackView.isHidden = false
            }
        }
        
        scalingTypePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.aspectRatio = item
            self?.component.layoutIfNeeded()
            self?.showDebug(show: self?.debugViewSwitch.isOn ?? false)
        }
        
        paddingPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            if let value = item.value {
                self?.paddingTextField.text = ""
                self?.component.padding = value
                self?.customPaddingRowView?.isHidden = true
            } else {
                self?.customPaddingRowView?.isHidden = false
            }
        }
        
        imageFallbackColorPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.imageFallbackColor = item
        }
        
        contentAreaBackgroundColorButton.onClick = { [weak self] _ in
            guard let self else { return }
            self.colorPickerType = .contentViewBackgroundColor
            self.colorPicker.selectedColor = self.component.contentView.backgroundColor ?? .white
            self.present(self.colorPicker, animated: true)
        }
    }
    
}

extension TileContainerViewController: ComponentSampleable {
    static func makeSample() -> ComponentSample {
        let component = Self.makeComponent()
        component.width = 150
        component.color = .primary
        return ComponentSample(component: component, trailingPinningType: .lessThanOrEqual)
    }
}

extension TileContainerViewController: UIColorPickerViewControllerDelegate {
    
    func selectedColorTapped(_ picker: ColorPickerView<ColorPickerType>) {
        let selectedColor = picker.selectedColor
        if let selectedColor {
            colorPicker.selectedColor = selectedColor
        }
        present(colorPicker, animated: true)
    }
    
    func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
        dismiss(animated: true)
    }
    
    func colorPickerViewControllerDidSelectColor(_ viewController: UIColorPickerViewController) {
        let color = viewController.selectedColor
        switch colorPickerType {
        case .contentViewBackgroundColor:
            component.contentView.backgroundColor = color
        case .backgroundColor:
            component.color = .custom(color)
        case .gradientColor1:
            gradientColorView1.selectedColor = viewController.selectedColor
            updateGradientColors()
        case .gradientColor2:
            gradientColorView2.selectedColor = viewController.selectedColor
            updateGradientColors()
        }
    }
    
    func updateGradientColors(){
        if let selectedGradient1Color = gradientColorView1.selectedColor,
           let selectedGradient2Color = gradientColorView2.selectedColor{
            component.backgroundEffect = .gradient(selectedGradient1Color, selectedGradient2Color)
        }
    }
}

extension TileContainerViewController {
    
    //Created new BackgroundEffect enum for sample app only. Since we defined enum with associated value color defined in TileContainer cannot be RawRepresentable & CaseIterable
    enum BackgroundEffect: String, CaseIterable {
        case transparency
        case gradient
        case none
        
        var rawValue: String {
            switch self {
            case .gradient:
                "gradient (select gradient colors to apply)"
            default:
                String(describing: self)
            }
        }
        
        var effect: TileContainer.BackgroundEffect? {
            return switch self {
            case .transparency:
                    .transparency
            case .gradient:
                nil
            case .none:
                TileContainer.BackgroundEffect.none
            }
        }
    }
    
    //Created new BackgroundColor enum for sample app only. Since we defined enum with associated value color defined in TileContainer cannot be RawRepresentable & CaseIterable
    enum BackgroundColor: String, CaseIterable {
        
        case primary, secondary, white, black, custom
        
        var color: TileContainer.BackgroundColor? {
            switch self {
            case .primary:
                    .primary
            case .secondary:
                    .secondary
            case .white:
                    .white
            case .black:
                    .black
            case .custom:
                nil
            }
        }
    }
        
    //Internal helper enum to map padding & pass custom padding values
    public enum Padding: String, CaseIterable {
        case padding3X
        case padding4X
        case padding6X
        case padding8X
        case padding12X
        case custom
        
        public var value: TileContainer.Padding? {
            return switch self {
            case .padding3X:
                    .padding3X
            case .padding4X:
                    .padding4X
            case .padding6X:
                    .padding6X
            case .padding8X:
                    .padding8X
            case .padding12X:
                    .padding12X
            case .custom:
                nil
            }
        }
    }
}