using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEditor;
using System.Linq;
using System;
using System.Reflection;
using Object = UnityEngine.Object;
using System.IO;

namespace Coffee.UIExtensions.Editors
{
	/// <summary>
	/// SoftMask editor.
	/// </summary>
	[CustomEditor(typeof(SoftMaskable))]
	[CanEditMultipleObjects]
	public class SoftMaskableEditor : Editor
	{
		static readonly List<Graphic> s_Graphics = new List<Graphic> ();
		Shader _shader;
		Shader _mobileShader;
		Shader _spriteShader;

		private void OnEnable ()
		{
			ClearMaterialEditors ();

			_shader = Shader.Find ("TextMeshPro/Distance Field (SoftMaskable)");
			_mobileShader = Shader.Find ("TextMeshPro/Mobile/Distance Field (SoftMaskable)");
			_spriteShader = Shader.Find ("TextMeshPro/Sprite (SoftMaskable)");


			s_PiFontSharedMaterial = s_TypeTMPro.GetProperty ("fontSharedMaterial");
         s_PiSpriteAsset = s_TypeTMPro.GetProperty ("spriteAsset");
         s_PiRichText = s_TypeTMPro.GetProperty ("richText");
         s_PiText = s_TypeTMPro.GetProperty ("text");
         s_FiMaterial = s_TypeTMP_SpriteAsset.GetField ("material");
			s_PiFontSharedMaterials = s_TypeTMPro.GetProperty ("fontSharedMaterials");
			s_miGetSpriteAsset = s_TypeTMProSettings.GetMethod ("GetSpriteAsset", BindingFlags.Static | BindingFlags.Public);

			s_PiDefaultFontAssetPath = s_TypeTMProSettings.GetProperty ("defaultFontAssetPath", BindingFlags.Static | BindingFlags.Public);
			s_PiDefaultSpriteAssetPath = s_TypeTMProSettings.GetProperty ("defaultSpriteAssetPath", BindingFlags.Static | BindingFlags.Public);
		}

		private void OnDisable ()
		{
			ClearMaterialEditors ();
		}

		public override void OnInspectorGUI ()
		{
			base.OnInspectorGUI ();

			var current = target as SoftMaskable;
			current.GetComponentsInChildren<Graphic> (true, s_Graphics);
			var fixTargets = s_Graphics.Where (x => x.gameObject != current.gameObject && !x.GetComponent<SoftMaskable> () && (!x.GetComponent<Mask> () || x.GetComponent<Mask> ().showMaskGraphic)).ToList ();
			if (0 < fixTargets.Count)
			{
				GUILayout.BeginHorizontal ();
				EditorGUILayout.HelpBox ("There are child Graphicss that does not have a SoftMaskable component.\nAdd SoftMaskable component to them.", MessageType.Warning);
				GUILayout.BeginVertical ();
				if (GUILayout.Button ("Fix"))
				{
					foreach (var p in fixTargets)
					{
						p.gameObject.AddComponent<SoftMaskable> ();
					}
				}
				if (GUILayout.Button ("Ping"))
				{
					EditorGUIUtility.PingObject (fixTargets [0]);
				}
				GUILayout.EndVertical ();
				GUILayout.EndHorizontal ();
			}

			ShowTMProWarning (_shader, _mobileShader, _spriteShader, m => { });


			//var current = target as SoftMaskable;
			var textMeshPro = current.GetComponent (s_TypeTMPro);
			if (textMeshPro != null)
			{
				Material[] fontSharedMaterials = s_PiFontSharedMaterials.GetValue (textMeshPro, new object [0]) as Material[];
				ShowMaterialEditors (fontSharedMaterials, 1, fontSharedMaterials.Length - 1);
			}
		}



		static readonly Type s_TypeTMPro = AppDomain.CurrentDomain.GetAssemblies ().SelectMany (x => x.GetTypes ()).FirstOrDefault (x => x.Name == "TMP_Text");
		static readonly Type s_TypeTMP_SpriteAsset = AppDomain.CurrentDomain.GetAssemblies ().SelectMany (x => x.GetTypes ()).FirstOrDefault (x => x.Name == "TMP_SpriteAsset");
		static readonly Type s_TypeTMProSettings = AppDomain.CurrentDomain.GetAssemblies ().SelectMany (x => x.GetTypes ()).FirstOrDefault (x => x.Name == "TMP_Settings");
		static readonly Type s_TypeTMP_SubMesh = AppDomain.CurrentDomain.GetAssemblies ().SelectMany (x => x.GetTypes ()).FirstOrDefault (x => x.Name == "TMP_SubMesh");
		static readonly Type s_TypeTMP_SubMeshUI = AppDomain.CurrentDomain.GetAssemblies ().SelectMany (x => x.GetTypes ()).FirstOrDefault (x => x.Name == "TMP_SubMeshUI");
		static PropertyInfo s_PiFontSharedMaterial;
		static PropertyInfo s_PiFontSharedMaterials;
		static PropertyInfo s_PiSpriteAsset;
		static PropertyInfo s_PiRichText;
		static PropertyInfo s_PiText;
		static PropertyInfo s_PiDefaultFontAssetPath;
		static PropertyInfo s_PiDefaultSpriteAssetPath;
		static FieldInfo s_FiMaterial; 
		static MethodInfo s_miGetSpriteAsset;
		List<MaterialEditor> _materialEditors = new List<MaterialEditor> ();


		void ClearMaterialEditors ()
		{
			foreach (var e in _materialEditors)
			{
				if (e)
				{
					DestroyImmediate (e);
				}
			}
			_materialEditors.Clear ();
		}

		protected void ShowMaterialEditors (Material [] materials, int startIndex, int count)
		{
			for (int i = 0; i < count; i++)
			{
				if (_materialEditors.Count == i)
				{
					_materialEditors.Add (null);
				}

				var mat = materials [startIndex + i];
				var editor = _materialEditors [i];
				if (editor && editor.target != mat)
				{
					DestroyImmediate (editor);
					editor = null;
				}

				if (!editor)
				{
					editor = _materialEditors [i] = Editor.CreateEditor (mat) as MaterialEditor;
				}

				editor.DrawHeader ();
				editor.OnInspectorGUI ();
			}
		}

		public void ShowTMProWarning (Shader shader, Shader mobileShader, Shader spriteShader, System.Action<Material> onCreatedMaterial)
		{
			var current = target as SoftMaskable;
			var textMeshPro = current.GetComponent (s_TypeTMPro);
			if(textMeshPro == null)
			{
				return;
			}

			Material fontSharedMaterial = s_PiFontSharedMaterial.GetValue (textMeshPro, new object[0]) as Material;
			if (fontSharedMaterial == null)
			{
				return;
			}

			// Is the material preset for dissolve?
			Material m = fontSharedMaterial;
			if (m.shader != shader && m.shader != mobileShader)
			{
				EditorGUILayout.BeginHorizontal ();
				EditorGUILayout.HelpBox (string.Format ("{0} requires '{1}' or '{2}' as a shader for material preset.", current.GetType ().Name, shader.name, mobileShader.name), MessageType.Warning);
				if (GUILayout.Button ("Fix"))
				{
					var correctShader = m.shader.name.Contains ("Mobile") ? mobileShader : shader;
					m = ModifyTMProMaterialPreset (m, correctShader, onCreatedMaterial);
					s_PiFontSharedMaterial.SetValue (textMeshPro, m, new object[0]);
				}
				EditorGUILayout.EndHorizontal ();
				return;
			}

			// Is the sprite asset for dissolve?
		object spriteAsset = s_PiSpriteAsset.GetValue(textMeshPro, new object[0]) ?? s_miGetSpriteAsset.Invoke(null, new object[0]);
			//TMP_SpriteAsset spriteAsset = textMeshPro.spriteAsset ?? TMP_Settings.GetSpriteAsset ();
			m = s_FiMaterial.GetValue(spriteAsset) as Material;
			bool hasSprite = (bool)s_PiRichText.GetValue (textMeshPro, new object [0]) && (s_PiText.GetValue (textMeshPro, new object [0]) as string).Contains ("<sprite=");
			if (m && m.shader != spriteShader && hasSprite)
			{
				EditorGUILayout.BeginHorizontal ();
				EditorGUILayout.HelpBox (string.Format ("{0} requires '{1}' as a shader for sprite asset.", GetType ().Name, spriteShader.name), MessageType.Warning);
				if (GUILayout.Button ("Fix"))
				{
					current.GetComponentsInChildren (s_TypeTMP_SubMesh).Select (x => x.gameObject).ToList ().ForEach (DestroyImmediate);
					current.GetComponentsInChildren (s_TypeTMP_SubMeshUI).Select (x => x.gameObject).ToList ().ForEach (DestroyImmediate);
					spriteAsset = ModifyTMProSpriteAsset (m, _spriteShader, mat=> { });
					s_PiSpriteAsset.SetValue (textMeshPro, spriteAsset, new object[0]);
				}
				EditorGUILayout.EndHorizontal ();
				return;
			}
		}

		Material ModifyTMProMaterialPreset (Material baseMaterial, Shader shader, System.Action<Material> onCreatedMaterial)
		{
			string path = AssetDatabase.GetAssetPath (baseMaterial);
			string filename = Path.GetFileNameWithoutExtension (path) + " (" + typeof(SoftMaskable).Name + ")";
			string defaultAssetPath = s_PiDefaultFontAssetPath.GetValue (null, new object [0]) as string;
			Material mat = Resources.Load<Material> (defaultAssetPath + filename);
			if (!mat)
			{
				mat = new Material (baseMaterial)
				{
					shaderKeywords = baseMaterial.shaderKeywords,
					shader = shader,
				};
				onCreatedMaterial (mat);
				AssetDatabase.CreateAsset (mat, Path.GetDirectoryName (path) + "/" + filename + ".mat");

				EditorUtility.FocusProjectWindow ();
				EditorGUIUtility.PingObject (mat);
			}
			else
			{
				mat.shader = shader;
			}
			EditorUtility.SetDirty (mat);
			return mat;
		}

		object ModifyTMProSpriteAsset (Material baseMaterial, Shader shader, System.Action<Material> onCreatedMaterial)
		{
			string path = AssetDatabase.GetAssetPath (baseMaterial);
			string filename = Path.GetFileNameWithoutExtension (path) + " (" + typeof (SoftMaskable).Name + ")";
			string defaultAssetPath = s_PiDefaultSpriteAssetPath.GetValue (null, new object [0]) as string;
			Object spriteAsset = Resources.Load (defaultAssetPath + filename, s_TypeTMP_SpriteAsset);
			if (spriteAsset == null)
			{
				AssetDatabase.CopyAsset (path, Path.GetDirectoryName (path) + "/" + filename + ".mat");
				spriteAsset = Resources.Load (defaultAssetPath + filename, s_TypeTMP_SpriteAsset);
				Material m = s_FiMaterial.GetValue (spriteAsset) as Material;
				m.shader = shader;
				m.name = shader.name;
				onCreatedMaterial (m);

				EditorUtility.FocusProjectWindow ();
				EditorGUIUtility.PingObject (spriteAsset);
			}
			else
			{
				Material m = s_FiMaterial.GetValue (spriteAsset) as Material;
				m.shader = shader;
			}
			EditorUtility.SetDirty (spriteAsset);
			return spriteAsset;
		}
	}
}