using System.Drawing;
using System.IO;
using TBO.UI.tboTK;
using XWolf.IO;

namespace TBO
{
    class LibraryTBO
    {
        private string path;

        public LibraryTBO(TBOFile tbo)
        {
            Title = tbo.Title;
            Variant = tbo.Variant;
            Volume = tbo.Volume;
            Author = tbo.Author;
            Publisher = tbo.Publisher;
            Year = tbo.Year;
            Comments = tbo.Comments;
            Image = GenThumb(tbo);
            path = tbo.FileName;
        }

        public LibraryTBO(FileStream fs)
        {
            path = fs.ReadString();
            Title = fs.ReadString();
            Variant = fs.ReadString();
            Volume = fs.ReadString();
            Author = fs.ReadString();
            Publisher = fs.ReadString();
            Year = fs.ReadInt32();
            Comments = fs.ReadString();
            Image = Image.FromStream(new MemoryStream(fs.ReadBlock()));
        }

        private Image GenThumb(TBOFile tbo)
        {
            Image image;
            using (Image page = tbo.GetImage(0))
            {
                if (page == null)
                    return null;
                image = new Bitmap(256, 256);
                using (Graphics g = Graphics.FromImage(image))
                {
                    g.DrawImageKeepRatioEx(page, 0, 0, image.Width, image.Height);
                }
            }
            return image;
        }

        public TBOFile Open()
        {
            return new TBOFile(path);
        }

        #region I/O

        public void CopyTo(string newPath)
        {
            File.Copy(path, newPath);
            path = newPath;
        }

        public void WriteTo(FileStream fs)
        {
            string p = path;
            if (p.StartsWith(Library.BasePath))
                p = p.Substring(Library.BasePath.Length + 1);
            fs.WriteString(p);
            fs.WriteString(Title);
            fs.WriteString(Variant);
            fs.WriteString(Volume);
            fs.WriteString(Author);
            fs.WriteString(Publisher);
            fs.WriteInt32(Year);
            fs.WriteString(Comments);
            fs.WriteBlock(ImageWorks.ImagePNG(Image));
        }

        #endregion

        private string GetDisplayName()
        {
            if (Library.ValidValue(Title))
            {
                string dname = Title;
                if (Library.ValidValue(Variant))
                    dname = dname + " (" + Variant.Trim() + ")";
                if (Library.ValidValue(Volume))
                    dname = dname + " Vol." + Volume.Trim();
                return dname;
            }
            else return FileName;
        }

        public string Title { get; }
        public string Variant { get; }
        public string Volume { get; }
        public string Author { get; }
        public string Publisher { get; }
        public int Year { get; }
        public string Comments { get; }
        public Image Image { get; }
        public string FileName => Path.GetFileNameWithoutExtension(path);
        public string DisplayName => GetDisplayName();
        public string FilePath => path;
    }
}