//
//  KMPostionIndicateView.swift
//  PDF Reader Pro
//
//  Created by lizhe on 2023/11/22.
//

import Cocoa

enum KMPositionIndicateViewStyle: Int {
    case topLeft = 0
    case topCenter = 1
    case topRight = 2
    case middleLeft = 3
    case middleCenter = 4
    case middleRight = 5
    case bottomLeft = 6
    case bottomCenter = 7
    case bottomRight = 8
}

class KMPostionIndicateView: NSView {
    var styleChangedCallBack: (() -> Void)?
    var isTile: Bool = false
    var style: KMPositionIndicateViewStyle = .middleCenter

    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
        
        guard let context = NSGraphicsContext.current?.cgContext else { return }
        
        for i in 0..<3 {
            for j in 0..<3 {
                context.saveGState()
                context.translateBy(x: CGFloat(28 * j), y: CGFloat(Int(bounds.height) - 28 * i - 24))
                context.addRect(CGRect(x: 0, y: 0, width: 24, height: 24))
                
                if style == KMPositionIndicateViewStyle(rawValue: j + 3 * i) {
                    context.setFillColor(KMAppearance.Interactive.a0Color().cgColor)
                } else {
                    context.setFillColor(KMAppearance.KM_DBDBDB_Color().cgColor)
                }
                
                context.fillPath()
                context.restoreGState()
            }
        }
    }

    override func mouseDown(with event: NSEvent) {
        let eventLocation = event.locationInWindow
        let localPoint = convert(eventLocation, from: nil)
        
        if isTile {
            return
        }
        
        let newStyle = styleForPoint(localPoint)
        if style != newStyle, let styleChangedCallBack = styleChangedCallBack {
            style = newStyle
            styleChangedCallBack()
            setNeedsDisplay(bounds)
        }
    }

    func styleForPoint(_ point: NSPoint) -> KMPositionIndicateViewStyle {
        for i in 0..<3 {
            for j in 0..<3 {
                let rect = NSRect(x: CGFloat(28 * j), y: CGFloat(Int(bounds.height) - 28 * i - 24), width: 24, height: 24)
                
                if rect.contains(point) {
                    return KMPositionIndicateViewStyle(rawValue: j + 3 * i) ?? .middleCenter
                }
            }
        }
        return .middleCenter
    }
}