using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace Txt2Bib
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            OutputDir = $@"{Directory.GetCurrentDirectory()}\bibtex";
            Directory.CreateDirectory(OutputDir);
            DropArea.AllowDrop = true;
            InitialDropText = DropArea.Text;
        }

        private string OutputDir { get; }
        private string InitialDropText { get; }

        private void Execute()
        {
            if (DropArea.Text == InitialDropText)
            {
                MessageBox.Show("Nessun percorso disponibile...");
                return;
            }
            var txt2bib = new Text2Bib();
            var result = txt2bib.Generate(DropArea.Text);
            Debug.Text = result;
            using var outputFile = new StreamWriter($@"{OutputDir}\output_bibtex.bib");
            outputFile.Write(result);
        }

        private void DropArea_Drop(object sender, DragEventArgs e)
        {
            // Get data object
            var dataObject = e.Data as DataObject;

            if (dataObject == null )
            {
                MessageBox.Show("Nessun percorso disponibile...");
                return;
            }

            // Check for file list
            if (dataObject.ContainsFileDropList())
            {
                // Clear values
                DropArea.Text = string.Empty;

                // Process file names
                var fileNames = dataObject.GetFileDropList();
                var bd = new StringBuilder();
                foreach (var fileName in fileNames)
                {
                    bd.Append(fileName + "\n");
                }
                // Set text
                DropArea.Text = bd.ToString();
            }
        }

        private void DropArea_PreviewDragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                e.Effects = DragDropEffects.Copy;
            }
            else
            {
                e.Effects = DragDropEffects.None;
            }
        }

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

        private void GoBtn_Click(object sender, RoutedEventArgs e)
        {
            Execute();
        }

        private void CopyDebug_Click(object sender, RoutedEventArgs e)
        {
            Debug.SelectAll();
            Debug.Copy();
        }

        private void OpenDestFolderBtn_Click(object sender, RoutedEventArgs e)
        {
            System.Diagnostics.Process.Start("explorer.exe", OutputDir);
        }

        private void ToggleMenu_Click(object sender, RoutedEventArgs e)
        {
            if (FileMenu.Visibility == Visibility.Collapsed)
            {
                FileMenu.Visibility = Visibility.Visible;
            }
            else
            {
                FileMenu.Visibility = Visibility.Collapsed;
            }
        }

        private void OpenOutputDir_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            System.Diagnostics.Process.Start("explorer.exe", OutputDir);
        }

        private void MenuExec_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            Execute();
        }

        private void Exit_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            Environment.Exit(0);
        }

        private void Help_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            MessageBox.Show("Trascinare i file txt da elaborare nella casella in alto e premere 'Esegui'.\n" +
                "Il file BibTeX viene generato in una cartella dedicata, che si può aprire selezionando " +
                "'Apri cartella output' dal menu.", "Help", MessageBoxButton.OK, MessageBoxImage.Information);
        }

        private void FileMenu_LostMouseFocus(object sender, RoutedEventArgs e)
        {
            FileMenu.Visibility = Visibility.Collapsed;
        }
    }
}