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

namespace BFEditor.Resource
{	
	public class ShaderDependenciesTools
	{
	    public static void ClearAllShaderDependencies()
	    {
	        Debug.Log("清理shader依赖...");
	        var guids = AssetDatabase.FindAssets("t:shader", new string[] {ResourceProcessConfig.SHADER_FOLDER_PATH });
	
	        var total = guids.Length;
	        var index = 1;
	        foreach (var guid in guids)
	        {
	            var path = AssetDatabase.GUIDToAssetPath(guid);
	            EditorUtility.DisplayProgressBar("正在检查清理shader依赖", path, (float)index / total);
	            ClearShaderDependencies(path);
	            index++;
	        }
	
	        EditorUtility.ClearProgressBar();
	        AssetDatabase.Refresh();
	    }
	
	    public static void ClearShaderDependencies(string shaderPath)
	    {
			if (!shaderPath.EndsWith(".shader"))
			{
				return;
			}
	        var shaderImporter = (ShaderImporter)AssetImporter.GetAtPath(shaderPath);
	        var shader = shaderImporter.GetShader();
	        var propertyCount = ShaderUtil.GetPropertyCount(shader);
	
	        var names = new List<string>();
	        var textures = new List<Texture>();
	
	        for (var i = 0; i < propertyCount; i++)
	        {
	            if (ShaderUtil.GetPropertyType(shader, i) != ShaderUtil.ShaderPropertyType.TexEnv)
	            {
	                continue;
	            }
	            var propertyName = ShaderUtil.GetPropertyName(shader, i);
	
	            var tex = shaderImporter.GetDefaultTexture(propertyName);
	            if (tex != null)
	            {
	                Debug.LogWarning(string.Format("shader {0} has default texture {1} ", shader.name, propertyName));
	            }
	
	            names.Add(propertyName);
	            textures.Add(null);
	        }
	
	        shaderImporter.SetDefaultTextures(names.ToArray(), textures.ToArray());
	        shaderImporter.SaveAndReimport();
	    }
	
	    public static void DoClearShaderDependencies()
	    {
	        ClearAllShaderDependencies();
	        EditorUtility.DisplayDialog("提示", "检查清理shader依赖完成", "ok");
	    }
	}
}