//
//  KMSecureTextFiled.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2022/11/28.
//

import Cocoa

enum KMSecureTextFiledMode: Int {
    case ciphertext = 0 /// 密文
    case plaintext = 1 /// 明文
}

enum KMSecureTextFiledViewMode: Int {
    case never = 0
    case whileEditing
    case unlessEditing
    case always
}

typealias KMSecureTextFiledFirstResponderHandler = (Bool)->()
private class KMSecureTextFiled_TextFiled: NSTextField {
    
    var firstResponderHandler: KMSecureTextFiledFirstResponderHandler?
    
    override func becomeFirstResponder() -> Bool {
        let result = super.becomeFirstResponder()
        
        guard let callback = firstResponderHandler else {
            return result
        }
        callback(result)
        
        return result
    }
}

private class KMSecureTextFiled_SecureTextFiled: NSSecureTextField {
    
    var firstResponderHandler: KMSecureTextFiledFirstResponderHandler?
    
    override func becomeFirstResponder() -> Bool {
        let result = super.becomeFirstResponder()
        
        guard let callback = firstResponderHandler else {
            return result
        }
        callback(result)
        
        return result
    }
}

typealias KMSecureTextFiledValueDidChange = (_ view: KMSecureTextFiled, _ string: String) -> Void
typealias KMSecureTextFiledBecomeFirstResponderHandler = (NSView)->()
typealias KMSecureTextFiledEnterAction = () -> ()

class KMSecureTextFiled: NSView {
    var enterAction: KMSecureTextFiledEnterAction?
    
    var backgroundView = NSView()
    private var textFiled = KMSecureTextFiled_TextFiled()
    private var secureTextField = KMSecureTextFiled_SecureTextFiled()
    
    var mode: KMSecureTextFiledMode = .ciphertext
    private var _rightView: NSView?
    var rightView: NSView? {
        get {
            return self._rightView
        }
        set {
            if self._rightView != newValue {
                if let view = self._rightView {
                    view.removeFromSuperview()
                }
                    
                self._rightView = newValue
            }
            
            if let view = self._rightView {
                self.addSubview(view)
                self.layoutSubtreeIfNeeded()
            }
            
            self.updateRightViewStateIfNeed(editing: self.kmEnabled)
        }
    }
    private var _rightViewMode = KMSecureTextFiledViewMode.whileEditing
    var rightViewMode: KMSecureTextFiledViewMode {
        get {
            return self._rightViewMode
        }
        set {
            self._rightViewMode = newValue
            
            self.updateRightViewStateIfNeed(editing: self.kmEnabled)
        }
    }
    
    private var _enabled = true
    var kmEnabled: Bool {
        get {
            return self._enabled
        }
        set {
            self._enabled = newValue
            
            textFiled.isEnabled = newValue
            secureTextField.isEnabled = newValue
            
            self.updateRightViewStateIfNeed(editing: newValue)
        }
    }
    
    var placeholderString: String {
        get {
            if (self.mode == .plaintext) {
                return self.textFiled.placeholderString ?? ""
            } else {
                return self.secureTextField.placeholderString ?? ""
            }
        }
        set {
            if (self.mode == .plaintext) {
                self.textFiled.placeholderString = newValue
            } else {
                self.secureTextField.placeholderString = newValue
            }
        }
    }
    
    var valueDidChange: KMSecureTextFiledValueDidChange?
    var becomeFirstResponderHandler: KMSecureTextFiledBecomeFirstResponderHandler?
    var didEndEditHandler: ((String?)->())?
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
        initDefaultValue()
        initSubViews()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        initDefaultValue()
        initSubViews()
    }
    
    func initDefaultValue() {
        mode = .ciphertext
        self.secureTextField.isHidden = false
        self.secureTextField.isBezeled = false
        self.secureTextField.focusRingType = .none
        self.secureTextField.delegate = self
        self.textFiled.isHidden = true
        self.textFiled.isBezeled = false
        self.textFiled.focusRingType = .none
        self.textFiled.delegate = self
        
        let cell = self.textFiled.cell as? NSTextFieldCell
        cell?.allowedInputSourceLocales = [NSAllRomanInputSourcesLocaleIdentifier]
        
        self.textFiled.firstResponderHandler = { [unowned self] result in
            self.updateRightViewStateIfNeed(editing: result)
            
            guard let callback = self.becomeFirstResponderHandler else {
                return
            }
            callback(self)
        }
        
        self.secureTextField.firstResponderHandler = { [unowned self] result in
            self.updateRightViewStateIfNeed(editing: result)
            
            guard let callback = self.becomeFirstResponderHandler else {
                return
            }
            callback(self)
        }
    }
    
    func initSubViews() {
        self.addSubview(self.backgroundView)
        self.addSubview(self.secureTextField)
        self.addSubview(self.textFiled)
    }
    
    override func layout() {
        super.layout()
        
        let width: CGFloat = NSWidth(self.bounds)
        let height: CGFloat = NSHeight(self.bounds)
        
        self.backgroundView.frame = self.bounds
        
        var textFieldHeight: CGFloat = 22
        if let font = self.textFiled.font {
            textFieldHeight = font.pointSize * 1.5
        }
        let textFieldX: CGFloat = 12
        if let rightView = self.rightView {
            let rightWidth = NSWidth(rightView.frame)
            rightView.frame = NSMakeRect(width-rightWidth, 0, rightWidth, height)
            
            let textFieldFrame = NSMakeRect(textFieldX, (height-textFieldHeight)*0.5, width-textFieldX*2-rightWidth-5, textFieldHeight)
            self.secureTextField.frame = textFieldFrame
            self.textFiled.frame = textFieldFrame
        } else {
            let textFieldFrame = NSMakeRect(textFieldX, (height-textFieldHeight)*0.5, width-textFieldX*2, textFieldHeight)
            self.secureTextField.frame = textFieldFrame
            self.textFiled.frame = textFieldFrame
        }
    }
    
    func switchMode(mode: KMSecureTextFiledMode) {
        self.mode = mode
        
        if (mode == .ciphertext) { /// 密文
            self.secureTextField.isHidden = false
            self.secureTextField.stringValue = self.textFiled.stringValue
            self.window?.makeFirstResponder(self.secureTextField)
            
            self.textFiled.isHidden = true
        } else { /// 明文
            self.textFiled.isHidden = false
            self.textFiled.stringValue = self.secureTextField.stringValue
            self.window?.makeFirstResponder(self.textFiled)
            
            self.secureTextField.isHidden = true
        }
    }
    
    func clear() {
        self.secureTextField.stringValue = ""
        self.textFiled.stringValue = ""
        
        guard let callback = valueDidChange else {
            return
        }
        
        callback(self, "")
    }
    
    func password() -> String {
        return self.mode == .ciphertext ? self.secureTextField.stringValue : self.textFiled.stringValue
    }
    
    override func becomeFirstResponder() -> Bool {
        self.window?.makeFirstResponder(self.mode == .ciphertext ? self.secureTextField : self.textFiled)
        
        return super.becomeFirstResponder()
    }
    
    internal func updateRightViewStateIfNeed(editing: Bool) {
        guard let view = self.rightView else {
            return
        }
        
        if (self.rightViewMode == .always) {
            view.isHidden = false
            return
        }
        if (self.rightViewMode == .never) {
            view.isHidden = true
            return
        }
        
        if (editing) { // 开始编辑
            view.isHidden = self.rightViewMode != .whileEditing
        } else { // 结束编辑
            view.isHidden = self.rightViewMode == .whileEditing
        }
    }
}

extension KMSecureTextFiled: NSTextFieldDelegate {
    func controlTextDidChange(_ obj: Notification) {
        if (self.mode == .ciphertext) {
            if (self.secureTextField.isEqual(to: obj.object)) {
                guard let callback = valueDidChange else {
                    return
                }
                
                callback(self, self.secureTextField.stringValue)
            }
        } else {
            if (self.textFiled.isEqual(to: obj.object)) {
                guard let callback = valueDidChange else {
                    return
                }
                
                callback(self, self.secureTextField.stringValue)
            }
        }
    }
    
    func controlTextDidEndEditing(_ obj: Notification) {
        if (!self.secureTextField.isEqual(to: obj.object) && !self.textFiled.isEqual(to: obj.object)) {
            return
        }
        
        self.updateRightViewStateIfNeed(editing: false)
        
        guard let callback = self.didEndEditHandler else {
            return
        }
        callback(self.password())
    }
    
    func control(_ control: NSControl, textView: NSTextView, doCommandBy commandSelector: Selector) -> Bool {
        switch commandSelector {
        case #selector(NSResponder.insertNewline(_:)):
            if let inputView = control as? NSTextField {
//                //当当前TextField按下enter
                if inputView == self.textFiled ||
                    inputView == self.secureTextField {
                    guard let callBack = enterAction else { return false}
                    
                    callBack()
                }
            }
            return true
        default:
            return false
        }
    }
}