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

namespace VketCloudGUITools.Editor
{

    [CustomEditor(typeof(GUIActionListItem))]
    public class GUIActionListItemInspector : SubInspector
    {
        UnityEditor.Editor subEditor = null;

        private static Dictionary<Type, Type> InstanceTypeToInspectorType = null;

        public static void BuildInstanceTypeToInspectorType()
        {
            if (InstanceTypeToInspectorType != null)
                return;

            // GUIActionとCustomEditorの対応表を生成する
            var instanceTypes = typeof(GUIAction).GetSubclasses().Append(typeof(GUIAction));
            var inspectorTypes = typeof(GUIActionInspector).GetSubclasses().Append(typeof(GUIActionInspector));

            InstanceTypeToInspectorType = new Dictionary<Type, Type>();

            foreach (var instanceType in instanceTypes)
            {
                foreach (var inspectorType in inspectorTypes)
                {
                    var customAttributes = inspectorType.GetCustomAttributesData();

                    foreach (var attr in customAttributes)
                    {
                        if (attr.AttributeType == typeof(CustomEditor))
                        {
                            var targetInstanceType = (Type)attr.ConstructorArguments[0].Value;
                            if (targetInstanceType == instanceType)
                            {
                                InstanceTypeToInspectorType.Add(targetInstanceType, inspectorType);
                            }
                        }
                    }
                }
            }
        }

        public override void OnSubInspectorGUI(Rect position)
        {
            BuildInstanceTypeToInspectorType();

            var actionList = target as GUIActionListItem;
            var oldType = actionList.GUIActionType;

            base.OnSubInspectorGUI(position);

            var newType = actionList.GUIActionType;

            if (newType != oldType)
            {
                var newAction = CreateGUIAction(newType);
                if (newAction != null)
                {
                    Undo.RecordObject(actionList, "GUI Action List Item");
                    actionList.GUIAction = newAction;
                }
            }

            Type subInspectorType = null;

            if (actionList.GUIAction == null || !InstanceTypeToInspectorType.TryGetValue(actionList.GUIAction.GetType(), out subInspectorType))
            {
                subInspectorType = typeof(GUIActionInspector);
            }

            CreateCachedEditor(actionList.GUIAction, subInspectorType, ref subEditor);

            var subInspector = subEditor as SubInspector;
            if (subInspector != null)
            {
                subInspector.HideScriptField = true;
                var width = EditorGUIUtility.currentViewWidth;
                var subHeight = subInspector.GetSubInspectorHeight();

                Rect subPosition = position;
                subPosition.yMin += position.height - subHeight;

                using (new GUI.ClipScope(subPosition))
                {
                    subPosition.x = 0f;
                    subPosition.y = 0f;

                    subInspector.OnSubInspectorGUI(subPosition);
                }
            }
        }

        public override float GetSubInspectorHeight()
        {
            float height = base.GetSubInspectorHeight();

            var subInspector = subEditor as SubInspector;

            if (subInspector != null)
            {
                height += subInspector.GetSubInspectorHeight();
            }
            return height;
        }

        private Runtime.GUIAction CreateGUIAction(GUIAction.FuncType typeIndex)
        {
            switch (typeIndex)
            {
                case GUIAction.FuncType.Func:
                    return ScriptableObject.CreateInstance<Runtime.FuncGUIAction>();
                case GUIAction.FuncType.Flag:
                    return ScriptableObject.CreateInstance<Runtime.FlagGUIAction>();
                case GUIAction.FuncType.Index:
                    return ScriptableObject.CreateInstance<Runtime.IndexGUIAction>();
                case GUIAction.FuncType.String:
                    return ScriptableObject.CreateInstance<Runtime.StringGUIAction>();
                case GUIAction.FuncType.S2DI:
                    return ScriptableObject.CreateInstance<Runtime.S2DIGUIAction>();
                case GUIAction.FuncType.SetShowGUI:
                    return ScriptableObject.CreateInstance<Runtime.SetShowGUIGUIAction>();
                case GUIAction.FuncType.SetShowLayer:
                    return ScriptableObject.CreateInstance<Runtime.SetShowLayerGUIAction>();
                case GUIAction.FuncType.calljs:
                    return ScriptableObject.CreateInstance<Runtime.CallJSGUIAction>();
                case GUIAction.FuncType.callscript:
                    {
                        var action = ScriptableObject.CreateInstance<Runtime.CallScriptGUIAction>();
                        action.ActionName = "callscript";
                        return action;
                    }
                case GUIAction.FuncType.Master:
                case GUIAction.FuncType.World:
                case GUIAction.FuncType.Voice:
                case GUIAction.FuncType.SE:
                case GUIAction.FuncType.SystemSE:
                case GUIAction.FuncType.Video:
                    {
                        var action = ScriptableObject.CreateInstance<Runtime.SoundMixerGUIAction>();
                        action.FuncName = typeIndex.ToString();
                        return action;
                    }
                case GUIAction.FuncType.DebugLog:
                    {
                        var action = ScriptableObject.CreateInstance<Runtime.DebugLogGUIAction>();
                        action.ActionName = "DebugLog";
                        return action;
                    }
            }
            return null;
        }
    }
}