using System;
using System.IO;

namespace ClipForge
{
    public class ClipFile : System.ComponentModel.INotifyPropertyChanged
    {
        public event System.ComponentModel.PropertyChangedEventHandler? PropertyChanged;

        private string _thumbnailPath = "";

        public string Path { get; set; } = "";
        public string Title { get; set; } = "";
        public string Duration { get; set; } = "";
        public string FileSize { get; set; } = "";
        public DateTime CreatedAt { get; set; }
        public string CreatedAtDisplay => CreatedAt.ToString("MMM d, yyyy  h:mm tt");

        public string ThumbnailPath
        {
            get => _thumbnailPath;
            set
            {
                _thumbnailPath = value;
                PropertyChanged?.Invoke(this,
                    new System.ComponentModel.PropertyChangedEventArgs(
                        nameof(ThumbnailPath)));
            }
        }

        public bool HasThumbnail => File.Exists(_thumbnailPath);

        public static ClipFile FromPath(string path)
        {
            var info = new FileInfo(path);
            var thumbPath = System.IO.Path.ChangeExtension(path, ".thumb.png");
            return new ClipFile
            {
                Path = path,
                Title = System.IO.Path.GetFileNameWithoutExtension(path),
                FileSize = FormatFileSize(info.Length),
                CreatedAt = info.CreationTime,
                Duration = "0:30",
                ThumbnailPath = thumbPath
            };
        }

        private static string FormatFileSize(long bytes)
        {
            if (bytes >= 1_073_741_824)
                return $"{bytes / 1_073_741_824.0:F1} GB";
            if (bytes >= 1_048_576)
                return $"{bytes / 1_048_576.0:F0} MB";
            return $"{bytes / 1024.0:F0} KB";
        }
    }
}