using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using KTGMGemClient;
using Protobuf;
using System;
using Core.Utilities;

/**
 * 无尽模式掉落管理器
 * @Author: chenxin
 * @Date: 2020-10-20 15:37:08
 */
namespace TowerDefense.Level
{
    public class EndlessDropManager : Singleton<EndlessDropManager>
    {
        /// <summary>
        /// 掉落道具预制体列表
        /// </summary>
        public List<GameObject> PropList;

        /// <summary>
        /// 获得掉落事件
        /// </summary>
        public event Action<EndlessDrop> ObtainDropEvent;

        /// <summary>
        /// 所有掉落列表，其中包括已获得的还有未拾取的掉落
        /// </summary>
        public List<EndlessDrop> AllDropList;

        /// <summary>
        /// 掉落的唯一id
        /// </summary>
        private int dropId;

        /// <summary>
        /// 所有掉落在场景内的物体字典，使用唯一id索引方便查找
        /// </summary>
        private Dictionary<int, GameObject> DropObjDic;

        /// <summary>
        /// 掉落半径
        /// </summary>
        public float DropRadius { get; set; } = 50f;

        // Start is called before the first frame update
        private void Start()
        {
            AllDropList = new List<EndlessDrop>();
            DropObjDic = new Dictionary<int, GameObject>();
        }

        // Update is called once per frame
        private void Update()
        {
            for (int i = 0; i < AllDropList.Count; ++i)
            {
                if (AllDropList[i].IsPickupCompleted) continue;

                AllDropList[i].ElapsedTime += Time.deltaTime;

                if (AllDropList[i].ElapsedTime >= AllDropList[i].AutoPickupTime)
                {
                    AllDropList[i].IsPickupCompleted = true;
                    SafelyCallObtainDrop(AllDropList[i]);
                    RemoveDrop(AllDropList[i].Id);
                }
            }
        }

        /// <summary>
        /// 获取一个唯一的掉落id
        /// </summary>
        private int GetDropId()
        {
            return dropId++;
        }

        /// <summary>
        /// 手动拾取了掉落
        /// </summary>
        /// <param name="data"></param>
        public void OnClickDrop(EndlessDrop data)
        {
            data.IsPickupCompleted = true;
            SafelyCallObtainDrop(data);
            RemoveDrop(data.Id);
        }

        /// <summary>
        /// 根据reward获得预制体对象
        /// </summary>
        /// <param name="data"></param>
        private GameObject GetPrefabByReward(reward data)
        {
            switch (data.type)
            {
                case CURRENCY.Money:
                    return PropList[0];
                case CURRENCY.Gold:
                    return PropList[1];
                case CURRENCY.Box:
                    return PropList[1 + data.id];
            }

            return null;
        }

        /// <summary>
        /// 获得一些掉落
        /// </summary>
        /// <param name="list"></param>
        /// <param name="pos">小怪的世界坐标</param>
        public void AddDrop(List<reward> list, Vector3 pos)
        {
            for (int i = 0; i < list.Count; ++i)
            {
                EndlessDrop drop = new EndlessDrop();
                drop.Reward = list[i];
                drop.Id = GetDropId();

                GameObject prefabObj = GetPrefabByReward(list[i]);

                if (prefabObj == null)
                {
                    Debug.LogError($"--------------------- type: {list[i].type} id：{list[i].id} 没有对应的预制体 ---------------------");
                    continue;
                }

                EndlessDropReward dropReward = prefabObj.GetComponent<EndlessDropReward>();
                drop.AutoPickupTime = dropReward.AutoPickupTime;
                CreateDrop(drop, pos, list.Count > 0);
                AllDropList.Add(drop);
            }
        }

        /// <summary>
        /// 根据唯一id移除掉落
        /// </summary>
        /// <param name="id"></param>
        private void RemoveDrop(int id)
        {
            if (DropObjDic.ContainsKey(id))
            {
                Destroy(DropObjDic[id]);
                DropObjDic.Remove(id);
            }
        }

        /// <summary>
        /// 在场景中创建掉落的icon
        /// </summary>
        /// <param name="drop"></param>
        /// <param name="pos"></param>
        /// <param name="isRandom">是否需要随机位置</param>
        private void CreateDrop(EndlessDrop drop, Vector3 pos, bool isRandom = false)
        {
            GameObject dropLayer = GameObject.Find("DropLayer");
            GameObject prefabObj = GetPrefabByReward(drop.Reward);
            GameObject obj = Instantiate(prefabObj);
            GameObject mainUI = GameObject.Find("MainUI");

            Transform mainUITransform = mainUI.GetComponent<Transform>();
            obj.GetComponent<Transform>().SetParent(mainUITransform, true);
            Vector3 screenPos = Camera.main.WorldToScreenPoint(pos);
            screenPos.z = 0;
            obj.transform.position = screenPos;

            if (isRandom)
            {
                Vector2 p = UnityEngine.Random.insideUnitCircle * DropRadius;
                Vector3 pos1 = p.normalized * p.magnitude;
                Vector3 objPos = obj.transform.position;
                objPos.x += pos1.x;
                objPos.y += pos1.y;
                obj.transform.position = objPos;
            }

            obj.GetComponent<EndlessDropReward>().DropData = drop;
            DropObjDic.Add(drop.Id, obj);
        }

        /// <summary>
        /// 调用掉落获得事件
        /// </summary>
        /// <param name="data"></param>
        private void SafelyCallObtainDrop(EndlessDrop data)
        {
            if (ObtainDropEvent != null)
                ObtainDropEvent(data);
        }

        /// <summary>
        /// 获得所有已经拾取的掉落
        /// </summary>
        public List<EndlessDrop> GetAllObtainedDrop()
        {
            List<EndlessDrop> ret = new List<EndlessDrop>();

            for (int i = 0; i < AllDropList.Count; ++i)
            {
                if (AllDropList[i].IsPickupCompleted)
                    ret.Add(AllDropList[i]);
            }

            return ret;
        }

        /// <summary>
        /// 检查是否所有的掉落都被拾取
        /// </summary>
        public bool CheckAllDropPicked()
        {
            for (int i = 0; i < AllDropList.Count; ++i)
            {
                if (!AllDropList[i].IsPickupCompleted) return false;
            }

            return true;
        }
    }
}