//
//  TabViewContainerViewController.swift
//  VDSSample
//
//  Created by Matt Bruce on 5/24/23.
//

import Foundation
import UIKit
import VDS
import Combine
import VDSColorTokens

class TabsContainerViewController: BaseViewController<TabsContainer> {
    
    var disabledSwitch = Toggle()
    var borderlineSwitch = Toggle()
    var fillContainerSwitch = Toggle()
    var sampleSwitch = Toggle()
    var widthValueTextField = NumericField()
    var widthPercentageTextField = NumericField()

    var verticalOrientationFormStackView: UIStackView = {
        return UIStackView().with {
            $0.translatesAutoresizingMaskIntoConstraints = false
            $0.alignment = .fill
            $0.distribution = .fill
            $0.axis = .vertical
            $0.spacing = 10
            $0.isHidden = true
        }
    }()

    var horizontalOrientationFormStackView: UIStackView = {
        return UIStackView().with {
            $0.translatesAutoresizingMaskIntoConstraints = false
            $0.alignment = .fill
            $0.distribution = .fill
            $0.axis = .vertical
            $0.spacing = 10
        }
    }()

    override func allTextFields() -> [TextField]? { [widthValueTextField, widthPercentageTextField] }
    
    lazy var orientationPickerSelectorView = {
        PickerSelectorView(title: "",
                           picker: self.picker,
                           items: Tabs.Orientation.allCases)
    }()
    
    lazy var indicatorPositionPickerSelectorView = {
        PickerSelectorView(title: "",
                           picker: self.picker,
                           items: Tabs.IndicatorPosition.allCases)
    }()
    
    lazy var sizePickerSelectorView = {
        PickerSelectorView(title: "",
                           picker: self.picker,
                           items: Tabs.Size.allCases)
    }()

    lazy var overflowPickerSelectorView = {
        PickerSelectorView(title: "",
                           picker: self.picker,
                           items: Tabs.Overflow.allCases)
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        addContentTopView(view: component)
        setupPicker()
        setupModel()
    }
    
    override func setupForm(){
        super.setupForm()
        addFormRow(label: "Large Sample", view: .makeWrapper(for: sampleSwitch))
        addFormRow(label: "Disabled", view: .makeWrapper(for: disabledSwitch))
        addFormRow(label: "Show Borderline", view: .makeWrapper(for: borderlineSwitch))
        addFormRow(label: "Surface", view: surfacePickerSelectorView)
        addFormRow(label: "Size", view: sizePickerSelectorView)
        
        if UIDevice.isIPad {
            addFormRow(label: "Orientation", view: orientationPickerSelectorView)
            //only in vertical mode
            addFormRow(label: "% Width (0.25 -> 1.0)", view: widthPercentageTextField, stackView: verticalOrientationFormStackView)
            addFormRow(label: "# Width", view: widthValueTextField, stackView: verticalOrientationFormStackView)
        }
        
        //only in horizontal mode
        addFormRow(label: "Fill Container", view: .makeWrapper(for: fillContainerSwitch), stackView: horizontalOrientationFormStackView)
        addFormRow(label: "Indicator Position", view: indicatorPositionPickerSelectorView, stackView: horizontalOrientationFormStackView)
        addFormRow(label: "Overflow", view: overflowPickerSelectorView, stackView: horizontalOrientationFormStackView)
        
        formStackView.addArrangedSubview(verticalOrientationFormStackView)
        formStackView.addArrangedSubview(horizontalOrientationFormStackView)
        
        disabledSwitch.onChange =  { [weak self] sender in
            self?.component.disabled = sender.isOn
        }
        
        borderlineSwitch.onChange =  { [weak self] sender in
            self?.component.borderLine = sender.isOn
        }
        
        fillContainerSwitch.onChange =  { [weak self] sender in
            self?.component.fillContainer = sender.isOn
        }

        sampleSwitch.onChange =  { [weak self] sender in
            guard let self else { return }
            self.component.selectedIndex = 0
            self.component.tabModels = sender.isOn ? self.getAllTabs() : self.getSomeTabs()
        }
        
        widthValueTextField.textPublisher.sink { [weak self] text in
            if let value = Double(text) {
                self?.component.width = .value(value)
                self?.widthPercentageTextField.text = ""

            }
        }.store(in: &subscribers)

        widthPercentageTextField.textPublisher.sink { [weak self] text in
            if let value = Double(text) {
                self?.component.width = .percentage(value)
                self?.widthValueTextField.text = ""
            }
        }.store(in: &subscribers)

    }
        
    func getTabs(texts:[String]) -> [TabsContainer.TabModel] {
        texts.compactMap {
            let label = Label()
            label.text = "This is an example of the \($0) Tab. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
            return TabsContainer.TabModel(model: .init(text: $0), view: label)
        }
    }
       
    func getAllTabs() -> [TabsContainer.TabModel] {
        getTabs(texts: ["Accessories", "Internet and TV", "Customer Service", "Contact Us"])
    }
    
    func getSomeTabs() -> [TabsContainer.TabModel] {
        getTabs(texts: ["Accessories", "Internet and TV"])
    }
    
    func setupModel() {
        //set to the large sample
        component.tabModels = getAllTabs()

        //setup UI
        surfacePickerSelectorView.text = component.surface.rawValue
        sizePickerSelectorView.text = component.size.rawValue
        orientationPickerSelectorView.text = component.orientation.rawValue
        indicatorPositionPickerSelectorView.text = component.indicatorPosition.rawValue
        overflowPickerSelectorView.text = component.overflow.rawValue
        disabledSwitch.isOn = component.disabled
        borderlineSwitch.isOn = component.borderLine
        fillContainerSwitch.isOn = component.fillContainer
        sampleSwitch.isOn = true
        updateWidth()
    }
    
    func setupPicker(){
        surfacePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.surface = item
            self?.contentTopView.backgroundColor = item.color
        }
        
        sizePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.size = item
        }
        
        orientationPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.orientation = item
            self?.verticalOrientationFormStackView.isHidden = item == .horizontal
            self?.horizontalOrientationFormStackView.isHidden = item == .vertical
        }
        
        indicatorPositionPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.indicatorPosition = item
        }

        overflowPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.overflow = item
        }
    }
    
    func updateWidth() {
        switch component.width {
        case .percentage(let percentage):
            widthPercentageTextField.text = "\(percentage)"
        case .value(let value):
            widthValueTextField.text = "\(value)"
            widthPercentageTextField.text = ""
        @unknown default:
            print("")
        }
    }
    
}

open class TabsContainer: View {
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    open var tabMenu = Tabs()
    
    ///An optional callback that is called when the selectedIndex changes. Passes parameters (event, tabIndex).
    open var onTabChange: ((Int) -> Void)?
    
    ///Determines the layout of the Tabs, defaults to horizontal
    open var orientation: Tabs.Orientation = .horizontal { didSet { setNeedsUpdate() } }
    
    ///When true, Tabs will have border line. If false is passed then the border line won't be visible.
    open var borderLine: Bool = true { didSet { setNeedsUpdate() } }
    
    ///It will fill the Tabs to the width of the compoent and all Tabs will be in equal width when orientation is horizontal. This is recommended when there are no more than 2-3 tabs.
    open var fillContainer: Bool = false { didSet { setNeedsUpdate() } }
    
    ///When true, Tabs will be sticky to top of page, when orientation is vertical.
    open var indicatorFillTab: Bool = false { didSet { setNeedsUpdate() } }
    
    ///Sets the Position of the Selected/Hover Border Accent for All Tabs, only for Horizontal Orientation
    open var indicatorPosition: Tabs.IndicatorPosition = .bottom { didSet { setNeedsUpdate() } }
    
    ///Minimum Width for All Tabs, when orientation is horizontal.
    open var minWidth: CGFloat = 44.0 { didSet { setNeedsUpdate() } }
    
    ///If set to 'scroll', Tabs can be overflow and scrollable. With 'none', tabs will not overflow and labels will be wrapped to multiple lines if the label text is long.
    open var overflow: Tabs.Overflow = .scroll { didSet { setNeedsUpdate() } }
    
    ///The initial Selected Tab's index and is set once a Tab is clicked
    open var selectedIndex: Int = 0 { didSet { setNeedsUpdate() } }
    
    ///Determines the size of the Tabs TextStyle
    open var size: Tabs.Size = .medium { didSet { setNeedsUpdate() } }
    
    ///When true, Tabs will be sticky to top of page, when orientation is vertical.
    open var sticky: Bool = false { didSet { setNeedsUpdate() } }

    ///rules for width
    private var _width: Tabs.Width = .percentage(0.25)
    
    ///Width of all Tabs when orientation is vertical, defaults to 25%.
    open var width: Tabs.Width {
        get {
            return _width
        }
        set {
            switch newValue {
            case .percentage(let percentage):
                if percentage >= 0 && percentage <= 1 {
                    _width = newValue
                    setNeedsUpdate()
                } else {
                    print("Invalid percentage value. It should be between 0 and 1.")
                }
            case .value(let value):
                if value >= minWidth {
                    _width = newValue
                    setNeedsUpdate()
                } else {
                    print("Invalid value. It should be greater than or equal to \(minWidth).")
                }
            @unknown default:
                print("new value passed.")
            }
        }
    }

    ///Model of the Tabs you are wanting to show.
    open var tabModels: [TabModel] = [] {
        didSet {
            tabMenu.tabModels = tabModels.compactMap{ $0.model }
            bottomView.arrangedSubviews.forEach{ $0.removeFromSuperview() }
            tabModels.forEach {
                var view = $0.view
                view.isHidden = true
                bottomView.addArrangedSubview($0.view)
            }
            setNeedsUpdate()
        }
    }
    
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    private var contentViewWidthConstraint: NSLayoutConstraint?

    private var stackView = UIStackView().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.axis = .vertical
        $0.spacing = 5
        $0.alignment = .fill
        $0.distribution = .fill
    }
    
    private var bottomView = UIStackView().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.alignment = .fill
        $0.distribution = .fillProportionally
        $0.axis = .vertical
        $0.spacing = 10
    }

    private var tabMenuLayoutGuide = UILayoutGuide()

    open override func setup() {
        super.setup()
        tabMenu.addLayoutGuide(tabMenuLayoutGuide)
        addSubview(stackView)
        stackView.pinToSuperView()
        stackView.addArrangedSubview(tabMenu)
        stackView.addArrangedSubview(bottomView)
        
        NSLayoutConstraint.activate([
            tabMenuLayoutGuide.topAnchor.constraint(equalTo: topAnchor),
            tabMenuLayoutGuide.bottomAnchor.constraint(equalTo: bottomAnchor),
            tabMenuLayoutGuide.leadingAnchor.constraint(equalTo: leadingAnchor),
            tabMenuLayoutGuide.trailingAnchor.constraint(equalTo: trailingAnchor)
        ])
    }
    
    open override func updateView() {
        super.updateView()
        stackView.alignment = orientation == .horizontal ? .fill : .top
        stackView.axis = orientation == .horizontal ? .vertical : .horizontal
        
        tabMenu.onTabChange = { [weak self] index in
            guard let self else { return }
            self.tabClicked(index: index)
        }
        
        contentViewWidthConstraint?.isActive = false

        if orientation == .vertical {
            switch width {
            case .percentage(let amount):
                contentViewWidthConstraint = tabMenu.widthAnchor.constraint(equalTo: tabMenuLayoutGuide.widthAnchor, multiplier: amount)
            case .value(let amount):
                contentViewWidthConstraint = tabMenu.widthAnchor.constraint(equalToConstant: amount)
            @unknown default: break
            }
            contentViewWidthConstraint?.isActive = true
        }

        tabMenu.surface = surface
        tabMenu.disabled = disabled
        tabMenu.orientation = orientation
        tabMenu.borderLine = borderLine
        tabMenu.fillContainer = fillContainer
        tabMenu.indicatorFillTab = indicatorFillTab
        tabMenu.indicatorPosition = indicatorPosition
        tabMenu.minWidth = minWidth
        tabMenu.overflow = overflow
        tabMenu.selectedIndex = selectedIndex
        tabMenu.size = size
        tabMenu.sticky = sticky
        
        setSelected(index: selectedIndex)
        
        tabModels.forEach {
            var view = $0.view
            view.surface = surface
        }
    }
    
    private func tabClicked(index: Int) {
        onTabChange?(index)
        setSelected(index: index)
    }
    
    private func setSelected(index: Int) {
        for (modelIndex, model) in tabModels.enumerated() {
            var view = model.view
            let shouldShow = index == modelIndex
            view.isHidden = !shouldShow
        }
    }
}

extension TabsContainer {
    public struct TabModel {
        public typealias AnySurfaceableView = UIView & Surfaceable
        public var model: Tabs.TabModel
        public var view: AnySurfaceableView
        
        public init(model: Tabs.TabModel, view: AnySurfaceableView) {
            self.model = model
            self.view = view
        }
    }
}