//
//  KMCropCoverController.swift
//  PDF Reader Pro
//
//  Created by Niehaoyu on 2024/11/20.
//

import Cocoa
import KMComponentLibrary

@objc public enum CropPointPosition: Int {
    case none = 0
    case left_Top
    case left_Center
    case left_Bottom
    case top_Center
    case right_Top
    case right_Center
    case right_Bottom
    case bottom_Center
    case center
    
}

class ResizableView: NSView {
    
}

class KMCropCoverController: NSViewController {
    
    var emptyView: ResizableView!
    
    var stopGesture: Bool = false
    var initialFrame: NSRect = NSRect.zero
    
    var startPoint: NSPoint = .zero
    var pointType: CropPointPosition = .none
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do view setup here.
        
        setup()
    }
    
    func setup() {
        
        view.wantsLayer = true
//        view.layer?.backgroundColor = ComponentLibrary.shared.getComponentColorFromKey("colorBg/mask").cgColor
        view.layer?.backgroundColor = NSColor.red.cgColor
        
        // 创建空白 View
        emptyView = ResizableView(frame: NSRect(x: 100, y: 100, width: 200, height: 200))
        emptyView.wantsLayer = true
        emptyView.layer?.backgroundColor = NSColor.white.cgColor
        view.addSubview(emptyView)
        
        let panGesture = NSPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
        view.addGestureRecognizer(panGesture)
        
    }
    
    @objc func handlePan(_ gesture: NSPanGestureRecognizer) {
        let point = gesture.location(in: self.view)
        let emptyPoint = self.view.convert(point, to: emptyView)
        
        if gesture.state == .began {
            startPoint = point
            initialFrame = emptyView.frame
            
            if CGRectContainsPoint(emptyView.frame, point) == false {
                stopGesture = true
            } else {
                if CGRectContainsPoint(CGRectMake(0, 0, 12, 12), emptyPoint) {
                    pointType = .left_Bottom
                } else if CGRectContainsPoint(CGRectMake(0, CGRectGetHeight(emptyView.frame)/2 - 6, 12, 12), emptyPoint) {
                    pointType = .left_Center
                } else if CGRectContainsPoint(CGRectMake(0, CGRectGetHeight(emptyView.frame) - 12, 12, 12), emptyPoint) {
                    pointType = .left_Top
                } else if CGRectContainsPoint(CGRectMake(CGRectGetWidth(emptyView.frame)/2 - 6, CGRectGetHeight(emptyView.frame) - 12, 12, 12), emptyPoint) {
                    pointType = .top_Center
                } else if CGRectContainsPoint(CGRectMake(CGRectGetWidth(emptyView.frame) - 12, CGRectGetHeight(emptyView.frame) - 12, 12, 12), emptyPoint) {
                    pointType = .right_Top
                } else if CGRectContainsPoint(CGRectMake(CGRectGetWidth(emptyView.frame) - 12, CGRectGetHeight(emptyView.frame)/2 - 6, 12, 12), emptyPoint) {
                    pointType = .right_Center
                } else if CGRectContainsPoint(CGRectMake(CGRectGetWidth(emptyView.frame) - 12, 0, 12, 12), emptyPoint) {
                    pointType = .right_Bottom
                } else if CGRectContainsPoint(CGRectMake(CGRectGetWidth(emptyView.frame)/2 - 6, 0, 12, 12), emptyPoint) {
                    pointType = .bottom_Center
                } else if CGRectContainsPoint(CGRectInset(emptyView.bounds, 12, 12), emptyPoint) {
                    pointType = .center
                }
            }
        } else if gesture.state == .ended {
            stopGesture = false
            pointType = .none
        }
        
        if stopGesture == true ||
            pointType == .none {
            return
        }
        
        print(point.x-startPoint.x, point.y-startPoint.y)
        
        if gesture.state == .began {
            
        } else if gesture.state == .changed {
            let offsetX = point.x-startPoint.x
            let offsetY = point.y-startPoint.y
            
            var rect = initialFrame
            
            if pointType == .left_Bottom {
                if rect.origin.x + offsetX < 0 {
                    rect.origin.x = 0
                    rect.size.width = initialFrame.origin.x + rect.size.width
                } else {
                    rect.origin.x += offsetX
                    rect.size.width -= offsetX
                }
                
                if rect.origin.y + offsetY < 0 {
                    rect.origin.y = 0
                    rect.size.height = initialFrame.origin.y + rect.size.height
                } else {
                    rect.origin.y += offsetY
                    rect.size.height -= offsetY
                }
            } else if pointType == .left_Center {
                if rect.origin.x + offsetX < 0 {
                    rect.origin.x = 0
                    rect.size.width = initialFrame.origin.x + rect.size.width
                } else {
                    rect.origin.x += offsetX
                    rect.size.width -= offsetX
                }
            } else if pointType == .left_Top {
                if rect.origin.x + offsetX < 0 {
                    rect.origin.x = 0
                    rect.size.width = initialFrame.origin.x + rect.size.width
                } else {
                    rect.origin.x += offsetX
                    rect.size.width -= offsetX
                }
                
                rect.size.height += offsetY
            } else if pointType == .top_Center {
                rect.size.height += offsetY
            } else if pointType == .right_Top {
                rect.size.width += offsetX
                rect.size.height += offsetY
            } else if pointType == .right_Center {
                rect.size.width += offsetX
            } else if pointType == .right_Bottom {
                rect.size.width += offsetX
                
                if rect.origin.y + offsetY < 0 {
                    rect.origin.y = 0
                    rect.size.height = initialFrame.origin.y + rect.size.height
                } else {
                    rect.origin.y += offsetY
                    rect.size.height -= offsetY
                }
            } else if pointType == .bottom_Center {
                if rect.origin.y + offsetY < 0 {
                    rect.origin.y = 0
                    rect.size.height = initialFrame.origin.y + rect.size.height
                } else {
                    rect.origin.y += offsetY
                    rect.size.height -= offsetY
                }
            } else if pointType == .center {
                rect.origin.x += offsetX
                rect.origin.y += offsetY
                
                if CGRectGetMaxX(rect) > CGRectGetWidth(self.view.bounds) {
                    rect.origin.x = CGRectGetWidth(self.view.bounds) - rect.size.width
                }
                if CGRectGetMaxY(rect) > CGRectGetHeight(self.view.bounds) {
                    rect.origin.y = CGRectGetHeight(self.view.bounds) - rect.size.height
                }
                if rect.origin.x < 0 {
                    rect.origin.x = 0
                }
                if rect.origin.y < 0 {
                    rect.origin.y = 0
                }
            }
            
            if pointType == .center {
                
            } else {
                //                if rect.origin.x < 0 {
                //                    rect.origin.x = 0
                //                }
                //                if rect.origin.y < 0 {
                //                    rect.origin.y = 0
                //                }
                if CGRectGetMaxX(rect) > CGRectGetWidth(self.view.bounds) {
                    rect.size.width = CGRectGetWidth(self.view.bounds) - rect.origin.x
                }
                if CGRectGetMaxY(rect) > CGRectGetHeight(self.view.bounds) {
                    rect.size.height = CGRectGetHeight(self.view.bounds) - rect.origin.y
                }
                rect.size.height = max(0, rect.size.height)
                rect.size.width = max(0, rect.size.width)
            }
            
            
            print(rect)
            
            emptyView.frame = rect
            
        }
    }
}