//
//  LabelViewController.swift
//  VDSSample
//
//  Created by Matt Bruce on 8/16/22.
//

import Foundation
import UIKit
import VDS
import VDSColorTokens

class LabelViewController: BaseViewController<Label> {

    lazy var textSizePickerSelectorView = {
        TextSizePickerSelectorView(title: "",
                                   picker: self.picker)
    }()
    
    lazy var textPositionPickerSelectorView = {
        PickerSelectorView(title: TextPosition.left.rawValue,
                            picker: self.picker,
                           items: TextPosition.allCases)
    }()

    lazy var fontCategoryPickerSelectorView = {
        FontCategoryPickerSelectorView(title: "",
                                       picker: self.picker)
    }()
    //------------------------------------
    //testing only remove later
    //------------------------------------
    var useScaledLineHeight = Toggle().with { $0.isOn = NSMutableAttributedString.useScaledLineHeight }
    
    var pointSizeRange = Slider().with {
        $0.minimumValue = 5
        $0.value = 0
    }
    var lineheightRange = Slider()
    var lineSpacingRange = Slider()
    var topInsetRange = Slider().with {
        $0.maximumValue = 100
        $0.minimumValue = -100
        $0.value = 0
    }
    var bottomInsetRange = Slider().with {
        $0.maximumValue = 100
        $0.minimumValue = -100
        $0.value = 0
    }
    //------------------------------------
    var scaledMode: Bool { component.useScaledFont && TextStyle.canScaleFonts }
    var baseStyle: TextStyle! {
        didSet {
            baseStyleLabel.text = descriptionFor(style: baseStyle)
        }
    }
    
    func descriptionFor(style: TextStyle) -> String {
        let scaledFont = style.font.scaledFont
        var customizedDesc: String = "Name: \(style.rawValue) \nFont Face-Weight: \(style.font.fontName)"
        customizedDesc += "\nVDS LetterSpacing: \(style.letterSpacing)"
        if scaledMode {
            customizedDesc += "\nVDS PointSize: \(style.pointSize.rounded())"
            customizedDesc += "\n* iOS PointSize: \(scaledFont.pointSize.rounded())"
        } else {
            customizedDesc += "\n* VDS PointSize: \(style.pointSize.rounded())"
        }
        if scaledMode {
            if useScaledLineHeight.isOn {
                customizedDesc += "\nVDS LineHeight: \(style.lineHeight)"
                customizedDesc += "\n* VDS Ratio LineHeight: \(style.scaledLineHeight)"
            } else {
                customizedDesc += "\n* VDS LineHeight: \(style.lineHeight)"
            }
            customizedDesc += "\niOS LineHeight: \(scaledFont.lineHeight.rounded())"
        } else {
            customizedDesc += "\n* VDS LineHeight: \(style.lineHeight)"
            customizedDesc += "\niOS LineHeight: \(style.font.lineHeight.rounded())"
        }
        return customizedDesc
    }
        
    var currentStyle: TextStyle! {
        didSet {
            //--------------------------------------------------------------
            #warning("testing only remove later")
            //--------------------------------------------------------------
            pointSizeRange.value = Float(currentStyle.pointSize.rounded())
            pointSizeRange.maximumValue = Float(baseStyle.pointSize * 1.50)
            lineheightRange.value = Float(currentStyle.lineHeight.rounded())
            lineheightRange.maximumValue = Float(pointSizeRange.value * 1.50)
            lineheightRange.minimumValue = 1
            
            topInsetRange.value = Float(currentStyle.edgeInsets.top).rounded()
            bottomInsetRange.value = Float(currentStyle.edgeInsets.bottom).rounded()
            updateStyleLabel()
            //--------------------------------------------------------------
        }
    }

    var useScaledFont = Toggle()
    var boldSwitch = Toggle()
    var disabledSwitch = Toggle()
    var textField = TextField()
    private var isBold: Bool = false
    
    fileprivate func updateStyleLabel() {
        baseStyleLabel.text = descriptionFor(style: baseStyle)
        currentStyleLabel.text = descriptionFor(style: currentStyle)
    }

    override func setup() {
        super.setup()
        
        NotificationCenter
            .Publisher(center: .default, name: UIContentSizeCategory.didChangeNotification)
            .sink { [weak self] notification in
                self?.checkForScaledFonts()
            }.store(in: &subscribers)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        addContentTopView(view: component)
        setupPicker()
        setupModel()
    }
    var calculatedLabel = Label()
    var baseStyleLabel = Label()
    var scaledFontRow: UIView?
    var scaledLineHeightRow: UIView?
    var currentStyleRow: UIView?
    var currentStyleLabel = Label()
    func checkForScaledFonts() {
        scaledFontRow?.isHidden = !TextStyle.canScaleFonts
        scaledLineHeightRow?.isHidden = !TextStyle.canScaleFonts
        updateLabelStyle()
    }
        
    override func setupForm(){
        super.setupForm()
        addFormRow(label: "Disabled", view: disabledSwitch)
        addFormRow(label: "Bold", view: boldSwitch)
        addFormRow(label: "Surface", view: surfacePickerSelectorView)

        //Scaled Fonts implementation
        scaledFontRow = addFormRow(label: "Use Scaled Font", view: useScaledFont)
        scaledLineHeightRow = addFormRow(label: "Use Scaled LineHeight", view: useScaledLineHeight)
        checkForScaledFonts()

        addFormRow(label: "Text Position", view: textPositionPickerSelectorView)
        addFormRow(label: "Font Category", view: fontCategoryPickerSelectorView)
        addFormRow(label: "Text Size", view: textSizePickerSelectorView)
        addFormRow(label: "Text", view: textField)
        
        disabledSwitch.onChange = { [weak self] sender in
            self?.component.disabled = sender.isOn
        }

        boldSwitch
            .publisher(for: .valueChanged)
            .sink { [weak self] sender in
                self?.isBold = sender.isOn
                self?.updateLabelStyle()
            }.store(in: &subscribers)
        
        useScaledFont
            .publisher(for: .valueChanged)
            .sink { [weak self] sender in
                self?.component.useScaledFont = sender.isOn
                self?.updateLabelStyle()
            }.store(in: &subscribers)

        textField
            .textPublisher
            .sink { [weak self] text in
                self?.component.text = text
            }.store(in: &subscribers)
        
        //--------------------------------------------------------------
        #warning("testing only remove later")
        //--------------------------------------------------------------
        let testingSection = FormSection()
        testingSection.title = "Temporary Settings"
        testingSection.addFormRow(label: "Original Style Props", view: baseStyleLabel)
        currentStyleRow = testingSection.addFormRow(label: "Customized Style Props", view: currentStyleLabel)
        testingSection.addFormRow(label: "Calculated", view: calculatedLabel)
        testingSection.addFormRow(label: "Point Size", view: pointSizeRange)
        testingSection.addFormRow(label: "Line Height", view: lineheightRange)
        testingSection.addFormRow(label: "Top Inset", view: topInsetRange)
        testingSection.addFormRow(label: "Bottom Inset", view: bottomInsetRange)
        append(section: testingSection)
                
        useScaledLineHeight
            .publisher(for: .valueChanged)
            .sink { [weak self] toggle in
                NSMutableAttributedString.useScaledLineHeight = toggle.isOn
                self?.component.setNeedsUpdate()
                self?.updateStyleLabel()
        }.store(in: &subscribers)
        
        pointSizeRange.publisher(for: .valueChanged).sink(receiveValue: { [weak self] slider in
            guard let self else { return }
            let textStyle = self.component.textStyle
            self.component.textStyle = TextStyle(rawValue: textStyle.rawValue,
                                                 fontFace: textStyle.fontFace,
                                                 pointSize: slider.rounded,
                                                 lineHeight: textStyle.lineHeight,
                                                 letterSpacing: textStyle.letterSpacing,
                                                 edgeInsets: textStyle.edgeInsets)
            self.currentStyle = self.component.textStyle
        }).store(in: &subscribers)

        lineheightRange.publisher(for: .valueChanged).sink(receiveValue: { [weak self] slider in
            guard let self else { return }
            let textStyle = self.component.textStyle
            self.component.textStyle = TextStyle(rawValue: textStyle.rawValue,
                                                 fontFace: textStyle.fontFace,
                                                 pointSize: textStyle.pointSize,
                                                 lineHeight: slider.rounded,
                                                 letterSpacing: textStyle.letterSpacing,
                                                 edgeInsets: textStyle.edgeInsets)
            self.currentStyle = self.component.textStyle
        }).store(in: &subscribers)
        
        topInsetRange.publisher(for: .valueChanged).sink(receiveValue: { [weak self] slider in
            guard let self else { return }
            let textStyle = self.component.textStyle
            self.component.textStyle = TextStyle(rawValue: textStyle.rawValue,
                                                 fontFace: textStyle.fontFace,
                                                 pointSize: textStyle.pointSize,
                                                 lineHeight: textStyle.lineHeight,
                                                 letterSpacing: textStyle.letterSpacing,
                                                 edgeInsets: .init(top: slider.rounded, left: 0, bottom: CGFloat(bottomInsetRange.value), right: 0))
            self.currentStyle = self.component.textStyle
        }).store(in: &subscribers)

        bottomInsetRange.publisher(for: .valueChanged).sink(receiveValue: { [weak self] slider in
            guard let self else { return }
            let textStyle = self.component.textStyle
            self.component.textStyle = TextStyle(rawValue: textStyle.rawValue,
                                                 fontFace: textStyle.fontFace,
                                                 pointSize: textStyle.pointSize,
                                                 lineHeight: textStyle.lineHeight,
                                                 letterSpacing: textStyle.letterSpacing,
                                                 edgeInsets: .init(top: CGFloat(topInsetRange.value), left: 0, bottom: slider.rounded, right: 0))
            self.currentStyle = self.component.textStyle
        }).store(in: &subscribers)
        
        component.publisher(for: \.bounds)
            .sink { [weak self] rect in
            self?.calculatedLabel.text = "Actual height (* LineHeight x Text Lines): \(rect.height)"
        }.store(in: &subscribers)
        
        //------------------------------------
    }
        
    func setupModel() {
        component.text = "Helg¹ worldg Hell¹ worldg"
        
        //setup UI
        surfacePickerSelectorView.text = component.surface.rawValue
        disabledSwitch.isOn = component.disabled
        boldSwitch.isOn = isBold
        textField.text = component.text
        
        //set the font
        component.textStyle = .featureMedium
        fontCategory = .feature
        fontCategoryPickerSelectorView.text = fontCategory.rawValue.capitalized
        textSize = .medium
        textSizePickerSelectorView.text = textSize!.rawValue.capitalized
        updateLabelStyle()
            
    }
    
    override func showDebug(show: Bool) {
        component.layer.borderColor = UIColor.blue.cgColor
        component.layer.borderWidth = show ? 1 : 0
    }

    //Picker
    private var fontCategory: TextStyle.FontCategory = .feature {
        didSet {
            fontCategoryPickerSelectorView.text = fontCategory.rawValue
            textSizePickerSelectorView.items = fontCategory.sizes
            if textSizePickerSelectorView.items.count > 0 {
                textSize = textSizePickerSelectorView.items[0]
            } else {
                textSize = nil
            }
            updateLabelStyle()
        }
    }
    
    private var textSize: TextStyle.FontSize? = .medium {
        didSet {
            textSizePickerSelectorView.text = textSize?.rawValue ?? ""
            updateLabelStyle()
        }
    }
    
    var currentFont: UIFont {
        
        scaledMode ? currentStyle.font.scaledFont : currentStyle.font
    }
    
    func updateLabelStyle(){
        if let style = fontCategory.style(for: textSize, isBold: isBold) {
            component.textStyle = style
            baseStyle = style
            currentStyle = style
        }
    }
    
    func setupPicker(){
        surfacePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.surface = item
            self?.contentTopView.backgroundColor = item.color
        }

        textPositionPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.textPosition = item
        }
        
        textSizePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.textSize = item
        }

        fontCategoryPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.fontCategory = item
        }
    }

}

extension Slider {
    var rounded: CGFloat {
        CGFloat((value * 100).rounded() / 100)
    }
}


extension LabelViewController: ComponentSampleable {
    static func makeSample() -> ComponentSample {
        let component = Self.makeComponent()
        component.text = "Helg¹ worldg Hell¹ worldg"
        return ComponentSample(component: component)
    }
}