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

namespace AibisDream.FixSystem
{
    public class BodyModuleSystem : MonoBehaviour
    {
        public BodyModule[] BodyModules { get; private set; }
        public CableSystem CableSystem { get; private set; }

        #region 对外暴露事件

        public UnityEvent<Socket> PlugInEvent => CableSystem.plugInEvent;
        public UnityEvent<Socket> PlugOutEvent => CableSystem.plugOutEvent;

        public UnityEvent PlugStartDrag => CableSystem.plugStartDrag;
        public UnityEvent PlugEndDrag => CableSystem.plugEndDrag;
        
        #endregion
        
        [SerializeField]
        public BodyModuleSystemConfig config = BodyModuleSystemConfig.GeneDefaultConfig();

        private void Awake()
        {
            InitComponentRefs();
        }

        private void InitComponentRefs()
        {
            BodyModules = transform.GetComponentsInChildren<BodyModule>();
            CableSystem = transform.Find("Cable System").GetComponent<CableSystem>();
        }

        /// <summary>
        /// 寻找最接近的Module
        /// </summary>
        /// <param name="sourcePos">源位置</param>
        /// <param name="targetModule">最近的Module</param>
        /// <returns>是否能找到目标范围内的Module</returns>
        public bool TryFindClosestSocket(Vector3 sourcePos, out BodyModule targetModule)
        {
            var closestDistance = Mathf.Infinity;
            BodyModule closestModule = null;
            
            // 寻找最接近的BodyModule
            foreach (var bodyModule in BodyModules)
            {
                float tempDistance = Vector3.Distance(sourcePos, bodyModule.SocketPos);

                if (tempDistance < closestDistance)
                {
                    closestDistance = tempDistance;
                    closestModule = bodyModule;
                }
            }
            
            // 判断距离是否在目标范围内，在的话就返回，不在的话返回个空的
            if (closestDistance < config.plugSnappingRange && closestModule)
            {
                targetModule = closestModule;
                return true;
            }
            else
            {
                targetModule = null;
                return false;
            }
        }
        
        /// <summary>
        /// 插线系统是否插在插槽里
        /// </summary>
        /// <returns></returns>
        public bool IsPlugInSocket()
        {
            return CableSystem.curSocket != null;
        }
        
        [Serializable]
        public struct BodyModuleSystemConfig
        {
            public float plugSnappingRange;

            public static BodyModuleSystemConfig GeneDefaultConfig()
            {
                return new BodyModuleSystemConfig
                {
                    plugSnappingRange = 1f
                };
            }
        }
    }
}