//
//  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: - Open Password Files
    
    private var lockedFiles: [URL] = []
    func km_open_pdf_multi(type: KMPasswordInputWindowType = .open, progressBlock: ((_ index: Int, _ params: Any...)->Void)? = nil, completionBlock:@escaping ([CPDFDocument])->Void) {
        NSPanel.km_open_pdf_multi_success(self.view.window!, panel: nil) { urls in
            var results: [CPDFDocument] = []
            
            self.lockedFiles.removeAll()
            for url in urls {
                let document = CPDFDocument(url: url)
                if (document!.isLocked) {
                    self.lockedFiles.append(url)
                    continue
                }
                
                if let _document = document {
                    results.append(_document)
                }
            }
            
            if (self.lockedFiles.count == 0) {
                completionBlock(results)
                return
            }
            
            if let _callback = progressBlock {
                _callback(0, results)
            }
            var index = 0
            self.openPasswordWindow(fileUrl: self.lockedFiles.first!, type: type) { params in
                index += 1
                if (params.count <= 2) { // 参数错误
                    if let _callback = progressBlock { // 回调进度
                        _callback(index)
                    }
                    return
                }
                
                let fileUrl     = params[0] as! URL
                let result      = params[1] as! KMPasswordInputWindowResult
                let password    = params[2] as? String
                if (result == .cancel) {
                    if let _callback = progressBlock { // 回调进度
                        _callback(index, fileUrl, result)
                    }
                    return
                }
                
                let document = CPDFDocument(url: fileUrl)
                if let _password = password { // 将文档进行解密
                    document?.unlock(withPassword: _password)
                }
                if let _callback = progressBlock { // 回调进度
                    _callback(index, document as Any, fileUrl, result, password as Any)
                }
                // 将文档加入返回数据
                if let _document = document {
                    results.append(_document)
                }
            } completionBlock: {
                completionBlock(results)
            }
        }
    }
    
    fileprivate func openPasswordWindow(fileUrl: URL, type: KMPasswordInputWindowType, progressBlock: ((_ params: Any...)->Void)?, completionBlock:@escaping ()->Void) {
        KMPasswordInputWindow.openWindow(window: self.view.window!, type: type, url: fileUrl) { [weak self] result, password in
            // 将结果返回
            if let _callback = progressBlock {
                _callback(fileUrl, result, password as Any)
            }
            
            // 进行下一个
            self?.lockedFiles.removeFirst()
            if let _fileUrl = self?.lockedFiles.first {
                self?.openPasswordWindow(fileUrl: _fileUrl, type: type, progressBlock: progressBlock, completionBlock: completionBlock)
            } else {
                completionBlock()
            }
        }
    }
    
    // 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()
    }
}