using System.Linq;
using UnityEditor;
using UnityEngine;

public class SpritePostprocessor : AssetPostprocessor
{
    private static void OnPostprocessAllAssets(
        string[] importedAssets,
        string[] deletedAssets,
        string[] movedAssets,
        string[] movedFromAssetPaths)
    {
        var config = AtlasConfiguration.Instance;

        if (!config.autoGenerate) return;

        try
        {
            ProcessAssetChanges(
                importedAssets: importedAssets,
                deletedAssets: deletedAssets,
                movedAssets: movedAssets,
                movedFromPaths: movedFromAssetPaths
            );
        }
        catch (System.Exception e)
        {
            Debug.LogError($"Atlas processing error: {e.Message}\n{e.StackTrace}");
        }
        finally
        {
            AssetDatabase.Refresh();
        }
    }

    private static void ProcessAssetChanges(
        string[] importedAssets,
        string[] deletedAssets,
        string[] movedAssets,
        string[] movedFromPaths)
    {
        ProcessAssets(importedAssets, (path) =>
        {
            EditorSpriteSaveInfo.ConvertToSprite(path);
            EditorSpriteSaveInfo.OnImportSprite(path);
            LogProcessed("[Added]", path);
        });

        ProcessAssets(deletedAssets, (path) =>
        {
            EditorSpriteSaveInfo.OnDeleteSprite(path);
            LogProcessed("[Deleted]", path);
        });

        ProcessMovedAssets(movedFromPaths, movedAssets);
    }

    private static void ProcessAssets(string[] assets, System.Action<string> processor)
    {
        if (assets == null) return;

        foreach (var asset in assets)
        {
            if (ShouldProcessAsset(asset))
            {
                processor?.Invoke(asset);
            }
        }
    }

    private static void ProcessMovedAssets(string[] oldPaths, string[] newPaths)
    {
        if (oldPaths == null || newPaths == null) return;

        for (int i = 0; i < oldPaths.Length; i++)
        {
            if (ShouldProcessAsset(oldPaths[i]))
            {
                EditorSpriteSaveInfo.OnDeleteSprite(oldPaths[i]);
                LogProcessed("[Moved From]", oldPaths[i]);
                EditorSpriteSaveInfo.MarkParentAtlasesDirty(oldPaths[i]);
            }

            if (ShouldProcessAsset(newPaths[i]))
            {
                EditorSpriteSaveInfo.OnImportSprite(newPaths[i]);
                LogProcessed("[Moved To]", newPaths[i]);
                EditorSpriteSaveInfo.MarkParentAtlasesDirty(newPaths[i]);
            }
        }
    }

    private static bool ShouldProcessAsset(string assetPath)
    {
        var config = AtlasConfiguration.Instance;

        if (string.IsNullOrEmpty(assetPath)) return false;
        if (assetPath.StartsWith("Packages/")) return false;

        if (!assetPath.StartsWith(config.sourceAtlasRoot)) return false;
        if (config.excludeFolders.Any(assetPath.StartsWith)) return false;

        if (!IsValidImageFile(assetPath)) return false;

        foreach (var keyword in config.excludeKeywords)
        {
            if (assetPath.IndexOf(keyword, System.StringComparison.OrdinalIgnoreCase) >= 0)
                return false;
        }

        return true;
    }

    private static bool IsValidImageFile(string path)
    {
        var ext = System.IO.Path.GetExtension(path).ToLower();
        return ext switch
        {
            ".png" => true,
            ".jpg" => true,
            ".jpeg" => true,
            _ => false
        };
    }

    private static void LogProcessed(string operation, string path)
    {
        if (AtlasConfiguration.Instance.enableLogging)
        {
            Debug.Log($"{operation} {System.IO.Path.GetFileName(path)}\nPath: {path}");
        }
    }
}