//
//  KMCustomStepperView.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2023/6/8.
//

// 自定义步进器
class KMCustomStepperView: KMHoverView {
//    private lazy var content_stackView: NSStackView = {
//        let view = NSStackView()
//        // 排列方向 默认为水平(horizontal)
//        view.orientation = .horizontal
////        view.distribution = .fillProportionally
//        // 对齐方式
////        view.alignment = .centerY
//        view.spacing = 1
//
//        return view
//    }()
    
    private var _contentView = NSView()
    private var _backgroundView = NSView()
    var backgroundView: NSView {
        get {
            return self._backgroundView
        }
    }
    
    private var _textField = KMTextField()
    var textField: KMTextField {
        get {
            return self._textField
        }
    }
    private var _right_v_line = NSView()
    private var _right_up_button = NSButton()
    private var _right_h_line = NSView()
    private var _right_down_button = NSButton()
    
    private var _right_up_hover = KMHoverView()
    private var _right_down_hover = KMHoverView()
    
    var contentInset: NSEdgeInsets = NSEdgeInsetsZero {
        didSet {
            self.needsLayout = true
        }
    }
    var contentOffset: CGFloat = 8 {
        didSet {
            self.needsLayout = true
        }
    }
    
    var upItemImage: NSImage? {
        didSet {
            self._right_up_button.image = self.upItemImage
        }
    }
    var downItemImage: NSImage? {
        didSet {
            self._right_down_button.image = self.downItemImage
        }
    }
    var itemWidth: CGFloat = 20 {
        didSet {
            self.needsLayout = true
        }
    }
    var itemHeight: CGFloat = 14 {
        didSet {
            self.needsLayout = true
        }
    }
    var horizontalDividerHeight: CGFloat = 1 {
        didSet {
            self.needsLayout = true
        }
    }
    var horizontalDividerColor: NSColor = .lightGray {
        didSet {
            self._right_h_line.wantsLayer = true
            self._right_h_line.layer?.backgroundColor = self.horizontalDividerColor.cgColor
        }
    }
    var verticalDividerWidth: CGFloat = 1 {
        didSet {
            self.needsLayout = true
        }
    }
    var verticalDividerColor: NSColor = .lightGray {
        didSet {
            self._right_v_line.wantsLayer = true
            self._right_v_line.layer?.backgroundColor = self.verticalDividerColor.cgColor
        }
    }
    
    var kmEnabled = true {
        didSet {
            self.textField.isEnabled = self.kmEnabled
            self._right_up_button.isEnabled = self.kmEnabled
            self._right_down_button.isEnabled = self.kmEnabled
        }
    }
    
    var minValue: Double = CGFloat.leastNormalMagnitude
    var maxValue: Double = CGFloat.greatestFiniteMagnitude
    var increment: Double = 1
    var autorepeat = true
//    var valueWraps = false
    private var _kmValue: Double = 0
    var kmValue: Double {
        get {
            return self._kmValue
        }
        set {
            self._kmValue = newValue
            self.textField.stringValue = String(format: "%.f", self._kmValue)
        }
    }
    
    var rightHoverAction: ((NSButton, KMHoverAction)->Void)?
    weak var delegate: KMTextFieldDelegate?
    
    override var isFlipped: Bool {
        return true
    }
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
        self.initSubViews()
        self.initDefaultValue()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        self.initSubViews()
        self.initDefaultValue()
    }
    
    func initSubViews() {
        self.addSubview(self._contentView)
        
        self._contentView.addSubview(self._backgroundView)
        self._contentView.addSubview(self._textField)
        self._contentView.addSubview(self._right_v_line)
        self._contentView.addSubview(self._right_up_button)
        self._contentView.addSubview(self._right_h_line)
        self._contentView.addSubview(self._right_down_button)
        
        self._right_up_button.target = self
        self._right_up_button.action = #selector(_right_up_button_action)
        self._right_down_button.target = self
        self._right_down_button.action = #selector(_right_down_button_action)
        
        self._textField.firstResponderHandler = { [unowned self] result in
            self.delegate?.km_didBecomeFirstResponder(textField: self)
        }
        
        self._contentView.addSubview(self._right_up_hover, positioned: .below, relativeTo: self._right_up_button)
        self._contentView.addSubview(self._right_down_hover, positioned: .below, relativeTo: self._right_down_button)
        self._right_up_hover.hoverAction = { [unowned self] _, action in
            guard let callback = self.rightHoverAction else {
                return
            }
            callback(self._right_up_button, action)
        }
        self._right_down_hover.hoverAction = { [unowned self] _, action in
            guard let callback = self.rightHoverAction else {
                return
            }
            callback(self._right_down_button, action)
        }
    }
    
    func initDefaultValue() {
        self.horizontalDividerColor = .lightGray
        self.verticalDividerColor = .lightGray
        
        self._textField.isBezeled = false
        self._textField.focusRingType = .none
        self._textField.lineBreakMode = .byTruncatingTail
        self._textField.drawsBackground = false
        self._textField.delegate = self
        self._textField.formatter = TextFieldFormatter()
        
        self._right_up_button.isBordered = false
        self._right_up_button.title = ""
        self._right_down_button.isBordered = false
        self._right_down_button.title = ""
        
        if let _image = NSImage(named: "btn_arrow_gray_up_s_norm_on") {
            self.upItemImage = _image
        }
        if let _image = NSImage(named: "btn_arrow_gray_down_s_norm_on") {
            self.downItemImage = _image
        }
    }
    
    override func layout() {
        super.layout()
        
        let width: CGFloat = NSWidth(self.bounds)
        let height: CGFloat = NSHeight(self.bounds)
        
        let leftMargin: CGFloat = self.contentInset.left
        let topMargin: CGFloat = self.contentInset.top
        let rightMargin: CGFloat = self.contentInset.right
        let bottomMargin: CGFloat = self.contentInset.bottom
        let contentW: CGFloat = width - leftMargin - rightMargin
        let contentH: CGFloat = height - topMargin - bottomMargin
        
        self._contentView.frame = self.bounds
        self._backgroundView.frame = NSMakeRect(leftMargin, topMargin, contentW, contentH)
        
        let itemW = self.itemWidth
        let itemH = self.itemHeight
        var tfH: CGFloat = 22
        if let font = self._textField.font {
            tfH = font.pointSize * 1.5
        }
        let tfX = leftMargin + self.contentOffset
        self._textField.frame = NSMakeRect(tfX, (height-tfH)*0.5, width-tfX-rightMargin-itemW-self.verticalDividerWidth-self.contentOffset, tfH)
        
        let itemX: CGFloat = width-rightMargin-itemW-1
        self._right_v_line.frame = NSMakeRect(itemX-self.verticalDividerWidth*0.5, 0, self.verticalDividerWidth, contentH)
        self._right_up_button.frame = NSMakeRect(itemX, height*0.5+self.horizontalDividerHeight*0.5, itemW, itemH)
        self._right_h_line.frame = NSMakeRect(itemX, (height-self.horizontalDividerHeight)*0.5, itemW, self.horizontalDividerHeight)
        self._right_down_button.frame = NSMakeRect(itemX, 1.5, itemW, itemH)
        
        self._right_up_hover.frame = self._right_up_button.frame
        self._right_down_hover.frame = self._right_down_button.frame
    }
    
    @objc private func _right_up_button_action() {
        let value = self.kmValue + self.increment
        if (value > self.maxValue) {
            self.kmValue = self.autorepeat ? self.minValue : self.maxValue
        } else {
            self.kmValue = value
        }
        
        self.delegate?.km_controlTextDidChange(textField: self)
    }
    
    @objc private func _right_down_button_action() {
        let value = self.kmValue - self.increment
        if (value < self.minValue) {
            self.kmValue = self.autorepeat ? self.maxValue : self.minValue
        } else {
            self.kmValue = value
        }
        
        self.delegate?.km_controlTextDidChange(textField: self)
    }
}

extension KMCustomStepperView: NSTextFieldDelegate {
    func control(_ control: NSControl, textShouldBeginEditing fieldEditor: NSText) -> Bool {
        if let should = self.delegate?.km_controlTextShouldBeginEditing(textField: self) {
            return should
        }
        return true
    }
    
    func controlTextDidBeginEditing(_ obj: Notification) {
        if (!self._textField.isEqual(to: obj.object)) {
            return
        }
        
        self.delegate?.km_controlTextDidBeginEditing(textField: self)
    }
    
    func controlTextDidChange(_ obj: Notification) {
        if (!self._textField.isEqual(to: obj.object)) {
            return
        }
        
        if (self._textField.doubleValue > self.maxValue) {
            self.kmValue = self.maxValue
        } else if (self._textField.doubleValue < self.minValue) {
            self.kmValue = self.minValue
        } else {
            self.kmValue = self.textField.doubleValue
        }
        
        self.delegate?.km_controlTextDidChange(textField: self)
    }
    
    func control(_ control: NSControl, textShouldEndEditing fieldEditor: NSText) -> Bool {
        if let should = self.delegate?.km_controlTextShouldEndEditing(textField: self) {
            return should
        }
        return true
    }
    
    func controlTextDidEndEditing(_ obj: Notification) {
        if (!self._textField.isEqual(to: obj.object)) {
            return
        }
        
        self.delegate?.km_controlTextDidEndEditing(textField: self)
    }
}