//
//  KMTextField.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2023/6/7.
//

import Cocoa

protocol KMTextFieldDelegate: AnyObject {
//    associatedtype KMTextFieldType
    
    func km_controlTextShouldBeginEditing(textField: AnyObject) -> Bool
    func km_controlTextDidBeginEditing(textField: AnyObject)
    func km_controlTextDidChange(textField: AnyObject)
    func km_controlTextShouldEndEditing(textField: AnyObject) -> Bool
    func km_controlTextDidEndEditing(textField: AnyObject)
    
    func km_didBecomeFirstResponder(textField: AnyObject)
}

extension KMTextFieldDelegate {
    func km_controlTextShouldBeginEditing(textField: AnyObject) -> Bool { return true }
    func km_controlTextDidBeginEditing(textField: AnyObject) {}
    func km_controlTextDidChange(textField: AnyObject) {}
    func km_controlTextShouldEndEditing(textField: AnyObject) -> Bool { return true }
    func km_controlTextDidEndEditing(textField: AnyObject) {}
    func km_didBecomeFirstResponder(textField: AnyObject) {}
}

class KMTextField: NSTextField {
    private class _KMTextFieldCell: NSTextFieldCell {
        // 边框粗细
        var borderThickness: CGFloat = 1
        // 左右两边缩进
        var offset: CGFloat = 8.0

//        override func drawingRect(forBounds theRect: NSRect) -> NSRect {
//            var newRect = super.drawingRect(forBounds: theRect)
//            
//            let textSize = self.cellSize(forBounds: theRect)
//            let heightInset = newRect.size.height - textSize.height
//            if (heightInset > 0) {
//                newRect.size.height = textSize.height
//                newRect.origin.y += heightInset * 0.5
//            } else {
//                newRect.size.height = textSize.height
//                newRect.origin.y += heightInset
//            }
//            
//            newRect.origin.x += self.offset
//            newRect.size.width = theRect.width - self.offset * 2
//            
//            return newRect
//        }
        
        override func draw(withFrame cellFrame: NSRect, in controlView: NSView) {
            // Area that covers the NSTextField itself. That is the total height minus our custom border size.
            let interiorFrame = NSRect(x: 0, y: 0, width: cellFrame.width, height: cellFrame.height - self.borderThickness)

            let path = NSBezierPath()
            path.lineWidth = self.borderThickness
            // Line width is at the center of the line.
            path.move(to: NSPoint(x: 0, y: cellFrame.height))
            path.line(to: NSPoint(x: cellFrame.width, y: cellFrame.height))
            path.line(to: NSPoint(x: cellFrame.width, y: 0))
            path.line(to: NSPoint(x: 0, y: 0))
            NSColor.clear.setStroke()
            path.stroke()

            // Pass in area minus the border thickness in the height
            drawInterior(withFrame: interiorFrame, in: controlView)
        }
    }
    
    var borderThickness: CGFloat = 1 {
        didSet {
            if let _cell = self.cell as? _KMTextFieldCell {
                _cell.borderThickness = self.borderThickness
            }
            
            self.needsDisplay = true
        }
    }
    var offset: CGFloat = 8.0 {
        didSet {
            if let _cell = self.cell as? _KMTextFieldCell {
                _cell.offset = self.offset
            }
            
            self.needsDisplay = true
        }
    }
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
//        if let result = self.cell?.isKind(of: _KMTextFieldCell.self), !result {
//            self.cell = _KMTextFieldCell()
//        }
    }
    
    var firstResponderHandler: ((Bool)->Void)?
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
//        if let result = self.cell?.isKind(of: _KMTextFieldCell.self), !result {
//            self.cell = _KMTextFieldCell()
//        }
    }
    
    override class var cellClass: AnyClass? {
        set {
            super.cellClass = newValue
        }
        get {
            return _KMTextFieldCell.self
        }
    }
    
    override func becomeFirstResponder() -> Bool {
        let result = super.becomeFirstResponder()
        
        guard let callback = self.firstResponderHandler else {
            return result
        }
        callback(result)
        
        return result
    }
}