using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using FSEvent;
using FSBattle;
using FSRole;

namespace FSCard {
    /*
     * 卡片组
     * 包含鼠标进入，拖拽等一系列事件的回调
    */
    public class CardAction : MonoBehaviour, IPointerEnterHandler, IPointerDownHandler, IPointerUpHandler, IBeginDragHandler, IDragHandler {
        // 给定一个参数保存鼠标按下时候的位置
        public Vector3 StartPos { set; get; }
        // 给定一个参数来保存鼠标移动时候的位置
        private Vector3 movePos;

        // Use this for initialization
        void Start() {

        }

        // Update is called once per frame
        void Update() {

        }

        /*
         * 鼠标进入时候的回调
        */
        public void OnPointerEnter(PointerEventData eventData) {
            Vector3 anchPos = GetComponent<RectTransform>().anchoredPosition;
        }

        /*
         * 鼠标按下时的回调
        */
        public void OnPointerDown(PointerEventData eventData) {
            // 给起始和移动参数保存值
            //startPos = eventData.position;
            movePos = eventData.position;
        }

        /*
         * 鼠标抬起时的回调
        */
        public void OnPointerUp(PointerEventData eventData) {
            foreach (Transform trs in BattleFieldManager.Instance.RoleArray) {
                //Vector3 screenTrs = Camera.main.WorldToScreenPoint(trs.position);

                BoxCollider roleCollider = trs.GetComponent<BoxCollider>();
                // 再将世界碰撞区域转为屏幕上的
                Vector2 roleMax = Camera.main.WorldToScreenPoint(roleCollider.bounds.max);
                Vector2 roleMin = Camera.main.WorldToScreenPoint(roleCollider.bounds.min);
                Bounds roleBounds = new Bounds();
                roleBounds.SetMinMax(roleMin, roleMax);

                BoxCollider2D cardBox = transform.GetComponent<BoxCollider2D>();
                if (roleBounds.Intersects(cardBox.bounds)) {

                    Card card = this.GetComponent<Card>();
                    if (card != null) {
                        print("出牌 ... ");

                        Role role = trs.GetComponent<Role>();
                        if (role != null) {
                            card.Target = role;
                            //card.OnExecute();

                            // 需要保证剩下的能量足够
                            if (role.CurrentAttr.Mp >= card.Cost) {
                                role.CurrentAttr.Mp -= card.Cost;

                                Dictionary<string, object> info = new Dictionary<string, object>();
                                info.Add("card", this.transform);
                                EventListener.Instance.PostEvent(EventEnum.EVENT_ARMY_DEAL_CARD, info);

                                info.Add("role", role);
                                EventListener.Instance.PostEvent(EventEnum.EVENT_UPDATE_PLAYER_ENGINE, info);
                            } else {
                                // 否则将卡片移回原位
                                transform.position = StartPos;
                            }

                            return;
                        }
                    }
                }
            }

            transform.position = StartPos;
        }

        public void OnBeginDrag(PointerEventData eventData) {
            print("开始拖拽 ... ");
        }

        /*
         * 鼠标拖拽时的回调
        */
        public void OnDrag(PointerEventData eventData) {
            // 首先记录下抬起时候的位置
            Vector3 endPos = eventData.position;
            // 计算出卡片拖拽时候的位置，由原位置加上最终位置减去移动位置
            Vector3 pos = new Vector3(transform.position.x + (endPos.x - movePos.x),
                                      transform.position.y + (endPos.y - movePos.y), 0);

            // 赋值给当前组件
            transform.position = pos;
            // 再更新移动位置
            movePos = endPos;
        }
    }
}