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

import Foundation
import UIKit
import VDS
import VDSColorTokens
import Combine

class TileContainerViewController: BaseViewController<TileContainer> {
    
    lazy var colorPicker: UIColorPickerViewController = {
        let picker = UIColorPickerViewController()
        if case .custom(let hexCode) = component.color {
            picker.selectedColor = UIColor(hexString: hexCode)
        }
        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: TileContainer.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)
    }()

    lazy var gradientColorView1: UIStackView = {
        let stackView = UIStackView()
        let indicatorWrapper = View()
        indicatorWrapper.addSubview(gradientColor1View)
        indicatorWrapper.height(32)
        indicatorWrapper.pinTop()
        indicatorWrapper.pinLeading()
        indicatorWrapper.pinBottom()
        indicatorWrapper.pinTrailingGreaterThanOrEqualTo(anchor: indicatorWrapper.trailingAnchor)
        stackView.addArrangedSubview(indicatorWrapper)
        stackView.distribution = .fillEqually
        stackView.alignment = .fill
        var button = Button().with { instance in
            instance.size = .small
            instance.use = .secondary
            instance.text = "Select"
            instance.onClick = { [weak self] in
                self?.gradientColorTapped($0, view: self?.gradientColor1View)
            }
        }
        button.tag = 1
        let buttonWrapper = View()
        buttonWrapper.addSubview(button)
        buttonWrapper.height(32)
        button.pinTop()
        button.pinTrailing()
        button.pinBottom()
        button.pinLeadingGreaterThanOrEqualTo(anchor: buttonWrapper.leadingAnchor)
        stackView.addArrangedSubview(buttonWrapper)
        stackView.tag = 1
        stackView.spacing = 10
        return stackView
    }()
    
    lazy var gradientColorView2: UIStackView = {
        let stackView = UIStackView()
        stackView.distribution = .fillEqually
        stackView.alignment = .fill
        stackView.spacing = 10
        let indicatorWrapper = View()
        indicatorWrapper.addSubview(gradientColor2View)
        indicatorWrapper.height(32)
        indicatorWrapper.pinTop()
        indicatorWrapper.pinLeading()
        indicatorWrapper.pinBottom()
        indicatorWrapper.pinTrailingGreaterThanOrEqualTo(anchor: indicatorWrapper.trailingAnchor)
        stackView.addArrangedSubview(indicatorWrapper)
        var button = Button().with { instance in
            instance.size = .small
            instance.use = .secondary
            instance.text = "Select"
            instance.onClick = { [weak self] in
                self?.gradientColorTapped($0, view: self?.gradientColor2View)
            }
        }
        button.tag = 2
        let buttonWrapper = View()
        buttonWrapper.addSubview(button)
        buttonWrapper.height(32)
        button.pinTop()
        button.pinTrailing()
        button.pinBottom()
        button.pinLeadingGreaterThanOrEqualTo(anchor: buttonWrapper.leadingAnchor)
        stackView.addArrangedSubview(buttonWrapper)
        stackView.tag = 2
        return stackView
    }()
    
    var gradientColor1View: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.widthAnchor.constraint(equalToConstant: 20).isActive = true
        view.heightAnchor.constraint(equalToConstant: 20).isActive = true
        view.tag = 1
        return view
    }()

    var gradientColor2View: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.widthAnchor.constraint(equalToConstant: 20).isActive = true
        view.heightAnchor.constraint(equalToConstant: 20).isActive = true
        view.tag = 2
        return view
    }()
    
    var gradientColorsFormStackView = FormSection().with { $0.isHidden = true }
    var backgroundColor: BackgroundColor = .secondary
    var clickableSwitch = Toggle()
    var showBackgroundImageSwitch = Toggle()
    var showBorderSwitch = Toggle()
    var showDropShadowSwitch = Toggle()
    var selectedGradient1Color: String?
    var selectedGradient2Color: String?
    var colorPickerType: ColorPickerType = .backgroundColor
    var backgroundImage = UIImage(named: "backgroundTest")!
    var selectedGradientColorView: UIView?
    
    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"
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        addContentTopView(view: .makeWrapper(for: component))
        component.width = 150
        component.color = .secondary
        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"
        })
        addFormRow(label: "Surface", view: surfacePickerSelectorView)
        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)
        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)

        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.showDropShadows = sender.isOn
        }

        heightTextField
            .numberPublisher
            .sink { [weak self] number in
                self?.component.height = number?.cgFloatValue
            }.store(in: &subscribers)

        widthTextField
            .numberPublisher
            .sink { [weak self] number in
                self?.component.width = number?.cgFloatValue
            }.store(in: &subscribers)
    }
    
    func setupModel() {
        //setup UI
        surfacePickerSelectorView.text = component.surface.rawValue
        backgroundColorPickerSelectorView.text = backgroundColor.rawValue
        paddingPickerSelectorView.text = component.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.selectedGradient1Color = nil
                self.selectedGradient1Color = nil
                self.gradientColor1View.backgroundColor = .clear
                self.gradientColor2View.backgroundColor = .clear
            } else {
                self.colorPickerType = .gradientColors(gradientColor1View)
                self.gradientColorsFormStackView.isHidden = false
            }
        }
        
        scalingTypePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.aspectRatio = item
        }
        
        paddingPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.padding = item
        }

        imageFallbackColorPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.imageFallbackColor = item
        }
    }
    
    func gradientColorTapped(_ sender: Button, view: UIView?) {
        selectedGradientColorView = view
        let selectedColor = (sender.tag == 1) ? selectedGradient1Color : selectedGradient2Color
        if let selectedColor {
            colorPicker.selectedColor = UIColor(hexString: selectedColor)
        }
        present(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 colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
        dismiss(animated: true)
    }
    
    func colorPickerViewControllerDidSelectColor(_ viewController: UIColorPickerViewController) {
        guard let hexString = viewController.selectedColor.hexString else { return }
        switch colorPickerType {
        case .backgroundColor:
            component.color = .custom(hexString)
        case .gradientColors:
            guard let selectedGradientColorView else { return }
            if selectedGradientColorView.tag == 1 {
                selectedGradient1Color = hexString
            } else {
                selectedGradient2Color = hexString
            }
            selectedGradientColorView.backgroundColor = UIColor(hexString: hexString)
            if let selectedGradient1Color, let selectedGradient2Color {
                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 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, gray, custom
        
        var color: TileContainer.BackgroundColor? {
            switch self {
            case .primary:
                    .primary
            case .secondary:
                    .secondary
            case .white:
                    .white
            case .black:
                    .black
            case .gray:
                    .gray
            case .custom:
                nil
            }
        }
    }
    
    //Internal helper enum to identiy the configuration
    enum ColorPickerType {
        case backgroundColor, gradientColors(UIView)
    }
}