using UnityEditor;
using UnityEngine;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using log4net;

namespace P4Connect
{
	/// <summary>
	/// This class hooks onto the Asset Save/Delete/Move process and makes sure that
	/// Perforce is updated accordingly. It uses the perforce connection class
	/// (which internally uses Config to retrieve the connection settings)
	/// to open a connection to the server and add the required changes (add/checkout/delete/move).
	/// </summary>
	public class AssetPostProcessor
		: UnityEditor.AssetPostprocessor
	{
        private static readonly ILog log = LogManager.GetLogger(typeof(AssetPostProcessor));

		public static void OnPostprocessAllAssets (
			String [] aImportedAssets,
			String [] aDeletedAssets,
			String [] aMovedAssets,
			String [] aMovedFromAssetPaths)
		{
            if (!Config.ValidConfiguration)         // Should I queue up this stuff until the configuration is valid?
                return;

#if DEBUG
            log.DebugFormat("import: {0} delete: {1} move: {2} moveTo: {3}",
                Logger.StringArrayToString(aImportedAssets), 
                Logger.StringArrayToString(aDeletedAssets),
                Logger.StringArrayToString(aMovedAssets), 
                Logger.StringArrayToString(aMovedFromAssetPaths));
#endif
            HashSet<string> deleted = new HashSet<string>(aDeletedAssets);
            HashSet<string> imported = new HashSet<string>(aImportedAssets);

            // Find all files which are both deleted and imported.  These are "replaced" - They should be Checked Out.
            List<string> replaced = deleted.Intersect(aImportedAssets).ToList();
            if (replaced.Count > 0)
            {
                deleted.ExceptWith(replaced);          // remove replaced files from the delete list
                imported.ExceptWith(replaced);          // remove replaced files from the imported list
   
                Engine.CheckoutAssets(replaced.ToArray());
            }

            if (deleted.Any())
            {
                Engine.DeleteAssets(deleted.ToArray());
            } 
            
            if (imported.Any())
			{  
				Engine.CreateAssets(imported.ToArray());
			}
			
			if (aMovedAssets.Length > 0)
			{
				Engine.MoveAssets(aMovedFromAssetPaths, aMovedAssets);
			}
#if DEBUG
            log.Debug("... Complete");
#endif
		}
	}
}