//
//  KMPageNumberDisplayView.swift
//  PDF Reader Pro
//
//  Created by lizhe on 2023/4/25.
//

import Cocoa

protocol KMPageNumberDisplayViewDelegate: NSObject {
    func gotoPageIndex(view: KMPageNumberDisplayView, pageIndex: Int)
    func updateWidth(view: KMPageNumberDisplayView, width: CGFloat)
}


class KMPageNumberDisplayView: KMBaseXibView {

    @IBOutlet weak var totalPageCountLabel: NSTextField!
    @IBOutlet weak var pageWidthConstraint: NSLayoutConstraint!
    @IBOutlet weak var lineLabel: NSTextFieldCell!
    @IBOutlet weak var currentPageIndexLabel: FocusAwareTextField!
    @IBOutlet weak var currentPageContentView: NSView!
    @IBOutlet weak var pageLabelConstraint: NSLayoutConstraint!
    
    var displayType: KMPreferencePageIndicatorDisplayType? {
        didSet {
            self.updateViewDispaly()
        }
    }
    
    var timer: Timer?
    weak var delegate: KMPageNumberDisplayViewDelegate?
    
    var currentPageIndex: Int? {
        didSet {
            let string = (currentPageIndex! + 1).description
            self.currentPageIndexLabel.stringValue = string
            self.updateUI()
        }
    }
    
    var totalPagesCount: Int? {
        didSet {
            self.totalPageCountLabel.stringValue = totalPagesCount?.description ?? "1"
            self.updateUI()
        }
    }
    
    var hover: Bool = false {
        didSet{
            self.updateViewDispaly()
        }
    }
    
    var isEdit: Bool = false {
        didSet {
            self.currentPageIndexLabel.isEditable = isEdit
            if isEdit {
                _ = self.currentPageIndexLabel.becomeFirstResponder()
                self.currentPageIndexLabel.currentEditor()?.selectAll(nil)
            }
            self.updateUI()
        }
    }
    
    deinit {
        self.dismiss()
    }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        // Drawing code here.

    }

    override func setup() {
        self.backgroundColor(NSColor.km_init(hex: "#36383B"))
        self.shadow = NSShadow()
        self.wantsLayer = true
        self.layer?.shadowColor = NSColor.km_init(hex: "#000000", alpha: 0.16).cgColor
        self.layer?.shadowOffset = CGSize(width: 0, height: -2)
        self.layer?.shadowRadius = 8
        self.layer?.shadowOpacity = 1
        self.layer?.cornerRadius = 4
        
        self.currentPageIndexLabel.delegate = self
    }
    
    //刷新界面UI 和 数据
    override func reloadData() {
        
    }
    
    override func updateLanguage() {

    }
    
    override func updateUI() {
//        NSString(string: self.currentPageLabel.stringValue).boundingRect(with: NSSize(width: 1000, height: 1000)).size.width + 8
        self.totalPageCountLabel.textColor = NSColor.km_init(hex: "#FFFFFF")
        self.totalPageCountLabel.font = NSFont.SFProTextRegularFont(12.0)
        
        self.lineLabel.textColor = NSColor.km_init(hex: "#FFFFFF")
        self.lineLabel.font = NSFont.SFProTextRegularFont(12.0)
        
        if isEdit {
            currentPageIndexLabel.textColor = NSColor.km_init(hex: "#252629")
            currentPageIndexLabel.font = NSFont.SFProTextRegularFont(12.0)
            
            currentPageContentView.backgroundColor(NSColor.km_init(hex: "#FFFFFF"))
            currentPageContentView.border(NSColor.km_init(hex: "#DFE1E5"), 1, 4)
            
        } else {
            currentPageIndexLabel.textColor = NSColor.km_init(hex: "#FFFFFF")
            currentPageIndexLabel.font = NSFont.SFProTextRegularFont(12.0)
            
            currentPageContentView.backgroundColor(NSColor.km_init(hex: "#FFFFFF", alpha: 0))
            currentPageContentView.border(NSColor.km_init(hex: "#DFE1E5"), 0, 4)
        }

        self.delegate?.updateWidth(view: self, width: self.fetchWith(edit: self.isEdit))
    }
    
    override func resetData() {
        
    }
    
    override func addNotification() {
        
    }
    
    override func removeNotification() {
        
    }
    
    func fetchWith(edit: Bool = false) -> CGFloat {
        let currentIndexString: NSString = self.currentPageIndexLabel.stringValue as NSString
        let totalPageCountString: NSString = self.totalPageCountLabel.stringValue as NSString
        
        let attributes = [NSAttributedString.Key.font : NSFont.SFProTextRegularFont(12.0), NSAttributedString.Key.foregroundColor: NSColor.km_init(hex: "#FFFFFF")]
        let currentIndexStringWidth = currentIndexString.boundingRect(with: CGSize(width: 100, height: 36), attributes: attributes).width
        let totalPageCountStringWidth = totalPageCountString.boundingRect(with: CGSize(width: 100, height: 36), attributes: attributes).width
        
        var width = 16 + currentIndexStringWidth + 8 + 4 + 8 + totalPageCountStringWidth + 16
        if edit {
            self.pageWidthConstraint.constant = currentIndexStringWidth + 40
            self.pageLabelConstraint.constant = currentIndexStringWidth + 24
            width += 40
        } else {
            self.pageWidthConstraint.constant = currentIndexStringWidth
            self.pageLabelConstraint.constant = currentIndexStringWidth
        }
        
        return width
    }
}

//MARK: mouse
extension KMPageNumberDisplayView {
    override func mouseDown(with event: NSEvent) {
        KMPrint("mouseDown")
        if !self.isEdit {
            self.isEdit = true
            self.delegate?.updateWidth(view: self, width: self.fetchWith(edit: self.isEdit))
        }
    }
}

//MARK:
extension KMPageNumberDisplayView: NSTextFieldDelegate {
    func controlTextDidEndEditing(_ obj: Notification) {
        if obj.object is FocusAwareTextField {
            self.toPageIndex()
        }
    }
    
    func control(_ control: NSControl, textView: NSTextView, doCommandBy commandSelector: Selector) -> Bool {
        switch commandSelector {
        case #selector(NSResponder.insertNewline(_:)):
            if let _ = control as? NSTextField {
                //当当前TextField按下enter
                if (textView.string == self.currentPageIndexLabel.stringValue) {
                    KMPrint("按下 enter")
                    self.isEdit = false
                    self.toPageIndex()
                }
            }
            return true
        default:
            return false
        }
    }
    
    func toPageIndex() {
        var index = (self.currentPageIndex ?? 0) + 1
        if Int(self.currentPageIndexLabel.stringValue) != nil {
            index = min(max(1, Int(self.currentPageIndexLabel.stringValue)!), totalPagesCount!)
        }
        self.currentPageIndexLabel.stringValue = String(index)
        self.delegate?.gotoPageIndex(view: self, pageIndex: index - 1)
        self.updateUI()
    }
}

//MARK: In out
extension KMPageNumberDisplayView {
    @objc fileprivate func inView() {
        self.dismiss()
        NSAnimationContext.runAnimationGroup { NSAnimationContext in
            self.animator().alphaValue = 1
        }
    }
    
    @objc func outView() {
        NSAnimationContext.runAnimationGroup { NSAnimationContext in
            self.animator().alphaValue = 0
            self.dismiss()
            self.isEdit = false
        }
    }
    
    func reset() {
        self.dismiss()
        self.show()
    }
    
    func show(type: KMPreferencePageIndicatorDisplayType = .automatic) {
        self.displayType = type
    }
    
    func dismiss() {
        self.timer?.invalidate()
        self.timer = nil
    }
    
    func updateViewDispaly() {
        var type = self.displayType
        if hover {
            type = .always
        }
        
        if type == .automatic {
            if self.timer != nil {
                self.dismiss()
            }
            self.inView()
            self.timer = Timer.scheduledTimer(timeInterval: 3.0, target: self, selector: #selector(outView), userInfo: nil, repeats: true)
        } else if type == .never {
            self.dismiss()
        } else if type == .always {
            self.inView()
        }
    }
}