using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Sirenix.OdinInspector;
using KairoEngine.Core;
using KairoEngine.Core.ModuleSystem;
using Ink.Runtime;

namespace KairoEngine.StorySystem
{
    public enum StoryInitType
    {
        OnLoad,
        OnEvent,
        None
    }

    [Serializable, HideReferenceObjectPicker]
    public class StoryObject : System.Object
    {
        [HorizontalGroup("line", 0.3f), HideLabel] public string name;
        [HorizontalGroup("line", 0.7f), HideLabel, NonSerialized, ShowInInspector] public GameObject prefab;
        [HideInInspector, NonSerialized] public GameObject instance;
    }

    [Serializable, HideReferenceObjectPicker]
    public class StorySystemModule : GameModuleBase
    {
        public override string name => "Story Module";

        [ShowInInspector, NonSerialized] public TextAsset inkJSONAsset = null;
        public string storyName = "Storyline";

        public bool showStoryLog = false;

        public int lineInverval = 250;

        [LabelText("Start")] public StoryInitType startType;

        [ShowIf("@startType == StoryInitType.OnEvent")] public string eventStartName = "StartStory";

        [Space] public List<StoryObject> storyObjects = new List<StoryObject>();

        private StoryController storyController;
        private Transform storyObjectsContainer = null;

        public StorySystemModule(GameConfig config) : base(config)
        {
            this.gameConfig = config;
            this.className = this.GetType().AssemblyQualifiedName;
            this.typeName = "StorySystemModule";
        } 

        public override void Load(Transform parent)
        {
            if(storyObjects.Count > 0) storyObjectsContainer = new GameObject("StoryObjects").transform;
            if(storyObjectsContainer != null) storyObjectsContainer.transform.parent = parent;
        }

        public override void Start()
        {
            if(startType == StoryInitType.OnLoad) LoadStory(storyObjectsContainer);
            else if(startType == StoryInitType.OnEvent) GenericEvents.StartListening(eventStartName, () => LoadStory(storyObjectsContainer));
        }

        private void LoadStory(Transform parent)
        {
            if(inkJSONAsset != null) storyController = new StoryController(inkJSONAsset, storyName, storyObjects, parent, showStoryLog, lineInverval);
            else Debug.LogError($"Missing Ink Story asset in StorySystemModule");
            if(storyController != null) storyController.Start();
        }

        public override void Reset()
        {
            showStoryLog = false;
            inkJSONAsset = null;
            storyController = null;
        }

        public override void Destroy()
        {
            if(storyController != null) storyController.Stop();
            if(startType == StoryInitType.OnEvent) GenericEvents.StopListening(eventStartName, () => LoadStory(storyObjectsContainer));
        }

        public static StorySystemModule JSONToStorySystemModule(string data)
        {
            try
            {
                return JsonUtility.FromJson<StorySystemModule>(data);
            }
            catch (System.Exception e)
            {
                Debug.LogError($"Could not deserialize StorySystemModule: \n{e}");
                return new StorySystemModule(null);
            }
        }

        public override void OnBeforeSerialize(ObjectSerializer serializer) 
        { 
            if(inkJSONAsset != null) serializer.AddUnityObject("inkJSONAsset", inkJSONAsset);
            if(storyObjectsContainer != null) serializer.AddGameObject("storyObjectsContainer", storyObjectsContainer.gameObject);
            if(storyController != null) serializer.AddObject("storyController", storyController);
            for (int i = 0; i < storyObjects.Count; i++)
            {
                serializer.AddGameObject($"storyObjects_{i}_gameObject", storyObjects[i].prefab);
            }
            
        }

        public override void OnBeforeDeserialize(ObjectSerializer serializer) 
        { 
            
            // inkJSONAsset
            inkJSONAsset =  (TextAsset)serializer.GetUnityObject("inkJSONAsset");
            // storyObjectsContainer
            GameObject gameObject = serializer.GetGameObject("storyObjectsContainer");
            if(gameObject != null) storyObjectsContainer = gameObject.transform;
            // storyController
            storyController = (StoryController)serializer.GetObject("storyController");
            // storyObjects
            if(storyObjects == null) storyObjects = new List<StoryObject>();
            for (int i = 0; i < storyObjects.Count; i++)
            {
                var obj = storyObjects[i];
                if(obj == null) return;
                obj.prefab = serializer.GetGameObject($"storyObjects_{i}_gameObject");
            }
        }
    }
}