using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Forms;
using Compdfkit_Tools.Common;
using ComPDFKit.PDFDocument;

namespace Compdfkit_Tools.PDFControl
{
    public partial class EncryptionDialog : Window, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        public bool CanEncrypt => FileListControl.FileNum > 0 && SetEncryptionControl.ValidSetting;

        private CPDFDocument document;
        public EncryptionDialog()
        {
            InitializeComponent();
            DataContext = this;
            FileListControl.FileNumChanged += (sender, args) =>
            {
                OnPropertyChanged(nameof(CanEncrypt));
            };
            SetEncryptionControl.EncryptionSettingChanged += (sender, args) =>
            {
                OnPropertyChanged(nameof(CanEncrypt));
            };
        }

        private void ButtonCancel_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void ButtonEncrypt_Click(object sender, RoutedEventArgs e)
        {
            var dialog = new FolderBrowserDialog();
            dialog.ShowDialog();
            var savePath = dialog.SelectedPath;
            if (string.IsNullOrEmpty(savePath)) return;
            
            var permissionsInfo = new CPDFPermissionsInfo();
            string userPassword = string.Empty;
            string ownerPassword = string.Empty;

            if (SetEncryptionControl.IsOwnerPasswordEnabled &&  !string.IsNullOrEmpty(SetEncryptionControl.OwnerPassword))
            {
                permissionsInfo.AllowsPrinting = SetEncryptionControl.IsAllowPrint;
                permissionsInfo.AllowsCopying = SetEncryptionControl.IsAllowCopy;
                ownerPassword = SetEncryptionControl.OwnerPassword;
            }
            if(SetEncryptionControl.IsUserPasswordEnabled && !string.IsNullOrEmpty(SetEncryptionControl.UserPassword))
            {
                userPassword = SetEncryptionControl.UserPassword;
            }
            foreach (var fileInfoData in FileListControl.FileInfoDataList)
            {
                document = CPDFDocument.InitWithFilePath(fileInfoData.Location);
                if (document.IsLocked)
                {
                    PasswordWindow window = new PasswordWindow();
                    window.InitWithDocument(document);
                    window.Owner = this;
                    window.ShowDialog();
                    if (document.IsLocked)
                    {
                        continue;
                    }
                }
                document.Encrypt(userPassword, ownerPassword, permissionsInfo);
                document.WriteToFilePath(savePath + Path.DirectorySeparatorChar + Path.GetFileNameWithoutExtension(fileInfoData.FileName) + "_Encrypted.pdf");
                document.Release();
            }
        }

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}