using System;
using System.Collections.ObjectModel;
using System.IO;

namespace ClipForge
{
    public class ClipLibraryService
    {
        private FileSystemWatcher? _watcher;
        public ObservableCollection<ClipFile> Clips { get; } = new();

        public string ClipsDirectory { get; } = Path.Combine(
            Environment.GetFolderPath(
                Environment.SpecialFolder.MyVideos), "ClipForge");

        public void Initialize()
        {
            // Create directory if it doesn't exist
            if (!Directory.Exists(ClipsDirectory))
                Directory.CreateDirectory(ClipsDirectory);

            // Load existing clips
            LoadExistingClips();

            // Watch for new clips being saved
            _watcher = new FileSystemWatcher(ClipsDirectory, "*.mp4")
            {
                EnableRaisingEvents = true,
                NotifyFilter = NotifyFilters.FileName
            };

            _watcher.Created += OnClipCreated;
            _watcher.Deleted += OnClipDeleted;
        }

        private void LoadExistingClips()
        {
            Clips.Clear();
            var files = Directory.GetFiles(ClipsDirectory, "*.mp4");

            // Sort newest first
            Array.Sort(files, (a, b) =>
                File.GetCreationTime(b).CompareTo(File.GetCreationTime(a)));

            foreach (var file in files)
                Clips.Add(ClipFile.FromPath(file));
        }

        private void OnClipCreated(object sender, FileSystemEventArgs e)
        {
            // Must update UI on main thread
            App.MainQueue?.TryEnqueue(() =>
            {
                Clips.Insert(0, ClipFile.FromPath(e.FullPath));
            });
        }

        private void OnClipDeleted(object sender, FileSystemEventArgs e)
        {
            App.MainQueue?.TryEnqueue(() =>
            {
                for (int i = Clips.Count - 1; i >= 0; i--)
                {
                    if (Clips[i].Path == e.FullPath)
                    {
                        Clips.RemoveAt(i);
                        break;
                    }
                }
            });
        }

        public void DeleteClip(ClipFile clip)
        {
            if (File.Exists(clip.Path))
                File.Delete(clip.Path);
        }

        public void OpenInExplorer(ClipFile clip)
        {
            System.Diagnostics.Process.Start("explorer.exe",
                $"/select,\"{clip.Path}\"");
        }
    }
}