//
//  PasswordWindowController.swift
//  PDF Reader Pro
//
//  Created by kdanmobile on 2023/11/2.
//

import Cocoa

typealias closePwdCallBack = (_ password: String) -> ()

@objc protocol PasswordWindowDelegate: AnyObject {
    @objc optional func didFinshedUnlockFile(_ passwordWindowCtr: PasswordWindowController, password: String)
    @objc optional func didCancelUnlockFile(_ passwordWindowCtr: PasswordWindowController)
}

@objc class PasswordWindowController: NSWindowController{
    var fileURL: URL?
    var delegate: PasswordWindowDelegate?
    var tag: Int = 0
    var password: String?
    var closeCallBack: closePwdCallBack?
    
    @IBOutlet var passwordTextField: NSSecureTextField!
    @IBOutlet var titleTextField: NSTextField!
    @IBOutlet var textField: NSTextField!
    @IBOutlet var openButton: NSButton!
    @IBOutlet var cancelButton: NSButton!
    
    override init(window: NSWindow?) {
        super.init(window: window)
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    override func windowDidLoad() {
        super.windowDidLoad()
        
        self.titleTextField.stringValue = fileURL?.lastPathComponent ?? ""
        self.textField.stringValue = NSLocalizedString("This PDF is password protected. Please enter the password below to access this PDF.", comment: "")
        self.openButton.title = NSLocalizedString("Open", comment: "")
        self.cancelButton.title = NSLocalizedString("Cancel", comment: "")
    }
    
    @IBAction func cancelAction(_ sender: NSButton) {
        self.close()
    }
    
    @IBAction func OKAction(_ sender: NSButton) {
        guard let pdfDoc = CPDFDocument(url: self.fileURL) else {
            __NSBeep()
            return
        }
        
        let isOk = pdfDoc.unlock(withPassword: self.passwordTextField.stringValue)
        if isOk {
            if pdfDoc.permissionsStatus == .owner {
                self.password = self.passwordTextField.stringValue
                self.close()
            } else{
                self.incorrectPasswordAlert()
            }
        } else {
            self.incorrectPasswordAlert()
        }
    }
    
    func incorrectPasswordAlert() {
        let alert = NSAlert()
        alert.alertStyle = .critical
        alert.messageText = NSLocalizedString("Incorrect password. Please check your password and try again.", comment: "")
        alert.runModal()
    }
    
    @objc func didEndSheet(_ sheet: NSWindow, returnCode: NSInteger, contextInfo: UnsafeMutableRawPointer?) {
        if contextInfo != nil {
            let handler = contextInfo!.assumingMemoryBound(to: ((String) -> Void).self).pointee
            handler(password ?? "")
        }
    }

    func beginSheetModal(for window: NSWindow, completionHandler handler: ((String) -> Void)?) {
        struct Context {
            var handler: ((String) -> Void)?
        }
        
        var context = Context(handler: handler)
        
        // Pass the address of the struct as contextInfo
        let contextPointer = UnsafeMutableRawPointer(&context)
        NSApp.beginSheet(self.window!, modalFor: window, modalDelegate: self, didEnd: #selector(didEndSheet(_:returnCode:contextInfo:)), contextInfo: contextPointer)
    }

    
    override func close() {
        if (self.closeCallBack != nil) {
            closeCallBack!(password ?? "")
        }
    }
}