using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Drawing.Design;
using System.IO;
using System.Linq;
using System.Windows.Forms;
using TagLib;
using File = System.IO.File;

namespace MediaTagger
{
    public partial class MainForm : Form
    {
        private TagLib.File _tagInstance;

        public MainForm()
        {
            InitializeComponent();
            MediaFileDragDropLabel.Tag = MediaFileDragDropLabel.Text;
        }

        private void Reset()
        {
            LyricsTextBox.DataBindings.Clear();
            LyricsTextBox.Clear();
            MediaFileDragDropLabel.Text = MediaFileDragDropLabel.Tag as string;
            AdvPropertyGrid.SelectedObject = null;
            EasyPropertyGrid.SelectedObject = null;
            CoverPictureBox.Image = null;
            _tagInstance = null;
        }

        private void Common_DragEnter(object sender, DragEventArgs e)
        {
            var bMatchDropFormat = e.Data.GetDataPresent(DataFormats.FileDrop);
            var bMatchDataType = e.Data.GetData(DataFormats.FileDrop) is string[];
            var bMatchFileCount = ((string[])e.Data.GetData(DataFormats.FileDrop)).Length == 1;
            var bMatchExistFile = File.Exists(((string[])e.Data.GetData(DataFormats.FileDrop))[0]);

            e.Effect = bMatchDropFormat && bMatchDataType && bMatchFileCount && bMatchExistFile
                    ? DragDropEffects.Link
                    : DragDropEffects.None;
        }

        private void MediaFileDragDropLabel_DragDrop(object sender, DragEventArgs e)
        {
            _tagInstance?.Dispose();
            Reset();

            var path = ((string[])e.Data.GetData(DataFormats.FileDrop))[0];
            _tagInstance = TagLib.File.Create(path);

            MediaFileDragDropLabel.Text = path
                + Environment.NewLine + "TagType: " + _tagInstance.TagTypes;

            AdvPropertyGrid.SelectedObject = _tagInstance.Tag;
            EasyPropertyGrid.SelectedObject = new EasyTag(_tagInstance.Tag);
            CoverPictureBox.Image = _tagInstance.Tag.Pictures.FirstOrDefault()?.Data.Data.LoadAsImage();

            LyricsTextBox.DataBindings.Add("Text", _tagInstance.Tag, nameof(_tagInstance.Tag.Lyrics));
        }

        private void SaveButton_Click(object sender, EventArgs e)
        {
            _tagInstance.Save();

            Reset();
        }

        private void DiscardButton_Click(object sender, EventArgs e)
        {
            _tagInstance.Dispose();
            Reset();
        }

        private void CoverFileDragDropLabel_DragDrop(object sender, DragEventArgs e)
        {
            var path = ((string[])e.Data.GetData(DataFormats.FileDrop))[0];
            try
            {
                var img = Image.FromFile(path);
                if (false == System.Drawing.Imaging.ImageFormat.Jpeg.Equals(img.RawFormat))
                {
                    img.Dispose();
                    throw new ArgumentException("No a JPEG file");
                }

                var orig = CoverPictureBox.Image;
                CoverPictureBox.Image = img;
                orig?.Dispose();

                var bytes = File.ReadAllBytes(path);
                var pic = new Picture //REF: stackoverflow.com/a/30285220/2430943
                {
                    Type = PictureType.FrontCover,
                    Description = "Cover",
                    MimeType = "image/jpeg",
                    Data = bytes,
                };
                _tagInstance.Tag.Pictures = new IPicture[] { pic };
            }
            catch (Exception exception)
            {
                MessageBox.Show(exception.ToString(), "ERROR");
            }
        }

        private void CoverPictureBox_Click(object sender, EventArgs e)
        {
            if (null == _tagInstance) return;
            ;
            var data = _tagInstance.Tag.Pictures.FirstOrDefault()?.Data.Data;
            if (null == data)
            {
                MessageBox.Show("No cover embedded!");
                return;
            }

            var dialog = new SaveFileDialog
            {
                Title = "Save cover",
                Filter = "JPEG file(*.jpeg;*.jpg)|*.jpeg;*.jpg"
            };

            if (DialogResult.OK == dialog.ShowDialog(this))
            {
                File.WriteAllBytes(dialog.FileName, data);
            }
        }
    }

    internal class EasyTag
    {
        private readonly Tag _raw;

        public EasyTag(Tag tag)
        {
            _raw = tag;
        }

        [Category("Frequently Used")]
        public string Album { get => _raw.Album; set => _raw.Album = value; }

        [Category("Frequently Used")]
        public string Artists { get => string.Join(";", _raw.Performers); set => _raw.Performers = value.Split(new[] { ";" }, StringSplitOptions.RemoveEmptyEntries); }

        [Category("Frequently Used")]
        public string Title { get => _raw.Title; set => _raw.Title = value; }

        [Category("Other")]
        public string Genres { get => string.Join(";", _raw.Genres); set => _raw.Genres = value.Split(new[] { ";" }, StringSplitOptions.RemoveEmptyEntries); }

        [Category("Other")]
        public uint Track { get => _raw.Track; set => _raw.Track = value; }

        [Category("Other")]
        public uint Year { get => _raw.Year; set => _raw.Year = value; }

        [Category("Other")]
        [Editor(typeof(MultilineStringEditor), typeof(UITypeEditor))]
        public string Lyrics { get => _raw.Lyrics; set => _raw.Lyrics = value; }
    }

    internal static class ExtensionMethod
    {
        public static Image LoadAsImage(this byte[] data)
        {
            using (var ms = new MemoryStream(data))
            {
                return Image.FromStream(ms);
            }
        }
    }
}