//
//  KMBaseViewController.swift
//  PDF Master
//
//  Created by tangchao on 2023/5/5.
//

import Cocoa

// 基类 [抽象类]
class KMBaseViewController: NSViewController {
    
    // 是否需要菜单
    var needMenu = false {
        didSet {
            if (self.needMenu) {
                self.addMenu(to: self.view)
            } else {
                self.removeMenu(to: self.view)
            }
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        
        if (self.needMenu) {
            self.addMenu(to: self.view)
        } else {
            self.removeMenu(to: self.view)
        }
    }
    
    // MARK: - Menu Add & Remove
    
    public func addMenu(to view: NSView?) {
        if let menuView = view {
            self.addMenu(to: menuView)
            return
        }
        self.addMenu(to: self.view)
    }
    
    public func removeMenu(to view: NSView?) {
        if let menuView = view {
            self.removeMenu(to: menuView)
            return
        }
        self.removeMenu(to: self.view)
    }
    
    private func addMenu(to view: NSView) {
        // 先移除
        self.removeMenu(to: view)
        
        let menu = NSMenu()
        menu.delegate = self
        view.menu = menu
    }
    private func removeMenu(to view: NSView) {
        view.menu?.delegate = nil
        view.menu = nil
    }
}

extension KMBaseViewController: NSMenuDelegate, NSMenuItemValidation {
    func validateMenuItem(_ menuItem: NSMenuItem) -> Bool {
        return true
    }
    
    func menuNeedsUpdate(_ menu: NSMenu) {
        menu.removeAllItems()
    }
}