using System;
using System.Collections.Generic;
using UnityEngine;


namespace Stary.Evo.FiniteStateMachine
{
    public class FSMManager
    {
        public GameObject FSMMangerObject;
        private Dictionary<int, FSMController> controllers = new Dictionary<int, FSMController>();
        private Dictionary<int, SingleState> states = new Dictionary<int, SingleState>();
        private int nextControllerId = 0;
        private int nextStateId = 0;

        /// <summary>
        /// 创建FSMController
        /// </summary>
        /// <returns>返回创建的FSMController的识别Int值</returns>
        public int CreateFSMController()
        {
            if (FSMMangerObject == null)
            {
                Debug.LogError("FSM状态机还未初始化！！！");
                return -1;
            }
            else
            {
                int id = nextControllerId++;
                GameObject newController = new GameObject("FSMController" + id);
                newController.transform.SetParent(FSMMangerObject.transform);
                var controller = newController.AddComponent<FSMController>();
                controllers[id] = controller;
                return id;
            }
        }

        /// <summary>
        /// 销毁指定FSMController
        /// </summary>
        /// <param name="controllerId"></param>
        public void DestroyFSMController(int controllerId)
        {
            if (controllers.TryGetValue(controllerId, out var controller))
            {
                GameObject.Destroy(controller.gameObject);
                controllers.Remove(controllerId);
            }
            else
            {
                Debug.LogError("该Id的FSMController不存在或已被销毁！！！");
            }
        }

        /// <summary>
        /// 退出指定Controller中的所有状态
        /// </summary>
        /// <param name="controllerId"></param>
        public void ExitAllStateInController(int controllerId)
        {
            if (controllers.TryGetValue(controllerId, out var controller))
            {
                controller.ExitAll();
            }
            else
            {
                Debug.LogError("该Id的FSMController不存在或已被销毁！！！");
            }
        }

        /// <summary>
        /// 创建状态
        /// </summary>
        /// <param name="controllerId">状态挂载的ControllerId</param>
        /// <param name="stateDateAction">状态行为数据</param>
        /// <returns></returns>
        public int CreateState(int controllerId, StateDateAction stateDateAction)
        {
            if (controllers.TryGetValue(controllerId, out var controller))
            {
                // 创建state并将其添加到指定controller生命周期中
                SingleState state = new SingleState();
                state.stateDate = stateDateAction;
                controller.AddState(state);
                int id = nextStateId++;
                states[id] = state;
                return id;

            }
            else
            {
                Debug.LogError("该Id的FSMController不存在或已被销毁，状态初始化失败！！！");
                return -1;
            }
        }

        /// <summary>
        /// 进入指定状态
        /// </summary>
        /// <param name="stateId"></param>
        public void EnterState(int stateId)
        {
            if (states.TryGetValue(stateId, out var state))
            {
                state.Machine.Enter(state.GetType());
            }
            else
            {
                Debug.LogError("该Id的状态不存在！！！");
            }
        }

        /// <summary>
        /// 离开指定状态
        /// </summary>
        /// <param name="stateId"></param>
        public void ExitState(int stateId)
        {
            if (states.TryGetValue(stateId, out var state))
            {
                state.Machine.Exit(state.GetType());
            }
            else
            {
                Debug.LogError("该Id的状态不存在！！！");
            }
        }

        /// <summary>
        /// 销毁指定状态
        /// </summary>
        /// <param name="stateId"></param>
        public void DestroyState(int stateId)
        {
            if (states.TryGetValue(stateId, out var state))
            {
                states.Remove(stateId);
            }
        }

        // 将状态添加到FSMController
        public void AddStateToController(int controllerId, int stateId)
        {
            if (controllers.TryGetValue(controllerId, out var controller) && states.TryGetValue(stateId, out var state))
            {
                controller.AddState(state);
            }
        }
    }
}