// Copyright (c) 2017- schick Informatik
// Description: Dialogbox zum Vergleichen zweier Excel via Named cells
//

using bsmd.database;
using Microsoft.Win32;
using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Windows;

namespace ENI2.EditControls
{
    /// <summary>
    /// Interaction logic for CompareExcelDialog.xaml
    /// </summary>
    public partial class CompareExcelDialog : Controls.StatusWindowBase
    {

        #region Fields
        private string _sourcePath = null;
        private string _targetPath = null;
        #endregion

        public CompareExcelDialog()
        {
            InitializeComponent();
        }

        #region Drag&Drop event handler

        private void imageSource_Drop(object sender, DragEventArgs e)
        {
            string[] files = (string[]) e.Data.GetData(DataFormats.FileDrop);
            if (files != null)
            {
                foreach (string file in files)
                    Console.WriteLine(file);
                if (files.Length > 0)
                {
                    if (File.Exists(files[0]))
                    {
                        if (files[0].EndsWith("xls") || files[0].EndsWith("xlsx"))
                        {
                            _sourcePath = files[0];
                            textBoxSource.Text = _sourcePath;
                        }
                        else
                        {
                            textBoxSource.Text = null;
                            _sourcePath = null;
                        }
                    }
                    else
                    {
                        textBoxSource.Text = null;
                        _sourcePath = null;
                    }
                    EnableCompareButton();
                }
            }
            else
            {
                string link = (string)e.Data.GetData(DataFormats.Text);
                if(link != null)
                {

                    using (var client = new WebClient())
                    {
                        string fileName = Path.GetTempPath() + Guid.NewGuid().ToString() + ".xlsx";
                        client.DownloadFile(link, fileName);
                    }

                    /*
                    // check if it is really an url, try to download the file and open it
                    if (Uri.TryCreate(link, UriKind.Absolute, out Uri uri))
                    {
                        HttpClient client = new HttpClient();
                        var response = await client.GetAsync(uri);
                        string fileName = Path.GetTempPath() + Guid.NewGuid().ToString() + ".xlsx";
                        using (var fs = new FileStream(fileName, FileMode.CreateNew))                            
                        {
                            await response.Content.CopyToAsync(fs);
                            textBoxSource.Text = link;
                            _sourcePath = fileName;
                            EnableCompareButton();                            
                        }
                    }
                    */
                }
            }
        }

        private async void imageTarget_Drop(object sender, DragEventArgs e)
        {
            string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
            if (files != null)
            {
                foreach (string file in files)
                    Console.WriteLine(file);
                if (files.Length > 0)
                {
                    if (File.Exists(files[0]))
                    {
                        if (files[0].EndsWith("xls") || files[0].EndsWith("xlsx"))
                        {
                            _targetPath = files[0];
                            textBoxTarget.Text = _targetPath;
                        }
                        else
                        {
                            _targetPath = null;
                            textBoxTarget.Text = null;
                        }
                    }
                    else
                    {
                        _targetPath = null;
                        textBoxTarget.Text = null;
                    }
                    EnableCompareButton();
                }
            }
            else
            {
                string link = (string)e.Data.GetData(DataFormats.Text);
                if (link != null)
                {
                    // check if it is really an url, try to download the file and open it
                    if (Uri.TryCreate(link, UriKind.Absolute, out Uri uri))
                    {
                        HttpClient client = new HttpClient();
                        var response = await client.GetAsync(uri);
                        string fileName = Path.GetTempPath() + Guid.NewGuid().ToString() + ".xlsx";
                        using (var fs = new FileStream(fileName, FileMode.CreateNew))
                        {
                            await response.Content.CopyToAsync(fs);
                            textBoxTarget.Text = link;
                            _targetPath = fileName;
                            EnableCompareButton();                            
                        }
                    }
                }
            }
        }

        private void imageSource_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                e.Effects = DragDropEffects.Copy;
            }
        }

        private void textBoxSource_PreviewDragOver(object sender, DragEventArgs e)
        {
            e.Handled = true;
        }

        #endregion

        #region private methods

        private void EnableCompareButton()
        {
            this.buttonCompare.IsEnabled = (_targetPath != null) && (_sourcePath != null);
        }

        #endregion

        #region Comparison button handler logic

        private void buttonCompare_Click(object sender, RoutedEventArgs e)
        {
            Util.UIHelper.SetBusyState();

            string defaultName = string.Format("{0}.xlsx", Guid.NewGuid().ToString());                        
            SaveFileDialog sfd = new SaveFileDialog
            {
                Filter = "Excel Files|*.xls;*.xlsx",
                FileName = defaultName
            };

            if (sfd.ShowDialog() ?? false)
            {
                string resultPath = Excel.ExcelComparer.Compare(_sourcePath, _targetPath, sfd.FileName, out string errorMessage);
                if (!errorMessage.IsNullOrEmpty()) {
                    MessageBox.Show(errorMessage, "Comparison error", MessageBoxButton.OK, MessageBoxImage.Warning);
                }
                if (File.Exists(resultPath))
                {
                    if (new FileInfo(resultPath).Length > 0)
                    {
                        Process.Start(resultPath);
                    }
                }
            }

            // reset input values
            this.textBoxSource.Text = null;
            this.textBoxTarget.Text = null;
            this._sourcePath = null;
            this._targetPath = null;
            EnableCompareButton();

            this.Close();
        }

        #endregion

        #region click on textboxes opens file selection

        private void textBoxSource_PreviewMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog
            {
                Filter = "Excel Files|*.xls;*.xlsx"
            };
            if (ofd.ShowDialog() ?? false)
            {
                textBoxSource.Text = ofd.FileName;
                _sourcePath = ofd.FileName;
            }
            EnableCompareButton();
        }

        private void textBoxTarget_PreviewMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog
            {
                Filter = "Excel Files|*.xls;*.xlsx"
            };
            if (ofd.ShowDialog() ?? false)
            {
                textBoxTarget.Text = ofd.FileName;
                _targetPath = ofd.FileName;
            }
            EnableCompareButton();
        }

        #endregion

    }
}