using UnityEditor;
using UnityEngine;
using MuHua;

namespace MuHuaEditor {
    [CustomPropertyDrawer(typeof(SceneNameAttribute))]
    public class SceneNameDrawer : PropertyDrawer {
        int sceneIndex = -1;
        GUIContent[] sceneNames;

        readonly string[] scenePathSplit = { "/", ".unity" };
        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
            if (EditorBuildSettings.scenes.Length == 0) return;

            if (sceneIndex == -1)
                GetSceneNameArray(property);

            int oldIndex = sceneIndex;

            sceneIndex = EditorGUI.Popup(position, label, sceneIndex, sceneNames);

            if (oldIndex != sceneIndex)
                property.stringValue = sceneNames[sceneIndex].text;
        }

        private void GetSceneNameArray(SerializedProperty property) {
            var scenes = EditorBuildSettings.scenes;
            //初始化数组
            sceneNames = new GUIContent[scenes.Length];

            for (int i = 0; i < sceneNames.Length; i++) {
                string path = scenes[i].path;
                string[] splitPath = path.Split(scenePathSplit, System.StringSplitOptions.RemoveEmptyEntries);

                string sceneName = "";

                if (splitPath.Length > 0) {
                    sceneName = splitPath[splitPath.Length - 1];
                }
                else {
                    sceneName = "(Deleted Scene)";
                }
                sceneNames[i] = new GUIContent(sceneName);
            }

            if (sceneNames.Length == 0) {
                sceneNames = new[] { new GUIContent("Check Your Build Settings") };
            }

            if (!string.IsNullOrEmpty(property.stringValue)) {
                bool nameFound = false;

                for (int i = 0; i < sceneNames.Length; i++) {
                    if (sceneNames[i].text == property.stringValue) {
                        sceneIndex = i;
                        nameFound = true;
                        break;
                    }
                }
                if (nameFound == false)
                    sceneIndex = 0;
            }
            else {
                sceneIndex = 0;
            }

            property.stringValue = sceneNames[sceneIndex].text;
        }
    }
}