using Axibug;
using Axibug.Event;
using Axibug.Resources;
using Axibug.Runtime;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UIElements;

namespace Game
{
    public class InputComponent : GameComponent
    {
        private Vector2 _clickPoint;    //鼠标点击ui位置

        private int RoleID;

        private void Start()
        {
            //事件注册
            //AppEntry.Event.Subscribe(A123EventArgs.EventId, OnA123EventArgs);
        }


        /// <summary>
        /// 检测是否点击UI
        /// </summary>
        /// <param name="mousePosition"></param>
        /// <returns></returns>
        private GameObject GetPointerOverGameObject(Vector2 mousePosition, out bool hasUI)
        {
            hasUI = false;
            //创建一个点击事件
            PointerEventData eventData = new PointerEventData(EventSystem.current);
            eventData.position = mousePosition;
            List<RaycastResult> raycastResults = new List<RaycastResult>();
            //向点击位置发射一条射线，检测是否点击UI
            EventSystem.current.RaycastAll(eventData, raycastResults);

            if (raycastResults.Count == 0)
                return null;

            for(int i=0; i<raycastResults.Count; i++)
            {
                if (raycastResults[i].gameObject.layer == LayerMask.NameToLayer("UI"))
                {
                    hasUI = true;
                    continue;
                }
                
                return raycastResults[i].gameObject;
            }

            return null;
        }

        private Vector2 GetClickScreenPos()
        {
            //移动端
            if (Application.platform == RuntimePlatform.Android ||
                        Application.platform == RuntimePlatform.IPhonePlayer)
            {
                if (Input.touchCount == 0)
                    return Vector2.zero;

                // 手指刚触摸到屏幕的时候 手指在屏幕上移动
                if (Input.GetTouch(0).phase != TouchPhase.Began
                    && Input.GetTouch(0).phase != TouchPhase.Moved)
                    return Vector2.zero;

                return Input.GetTouch(0).position;
            }
            //其它平台
            else
            {
                if (!Input.GetMouseButtonDown(0))
                    return Vector2.zero;

                return Input.mousePosition;
            }
        }


        //点击角色
        //private bool ProcessRaycast(Vector2 point, out GameObject obj,out E_NODE_TYPE withNode,out int CharIndex)
        private bool ProcessRaycast(Vector2 point, out E_NODE_TYPE withNode,out int RoleID)
        {
            withNode = E_NODE_TYPE.N_FREE;
            RoleID = 0;

            RaycastHit hit;
            Ray ray = Camera.main.ScreenPointToRay(point);

            if (!Physics.Raycast(ray, out hit))
                return false;

            GameObject obj = hit.collider.gameObject;

            //点击怪物, 选中只作选中
            if (obj.CompareTag(Tags.Monster))
            {
                //TODO 点击到怪物
                return true;
            }
            else if(obj.CompareTag(Tags.NPC))
            {
                //TODO 点击到NPC
            }
            else if (obj.CompareTag(Tags.Players))
            {
                //TODO 点击到玩家
                return true;
            }

            return false;
        }

        // Update is called once per frame
        void Update()
        {
            //双指操作
            if (Update_DoubleTouch())
            {
                //如果有双指操作
                return;
            }

            //按下
            Vector2 clickPos = GetClickScreenPos();
            if (clickPos.Equals(Vector2.zero))
            {
                return;
            }

            //点击UI，退出
            GameObject obj = GetPointerOverGameObject(clickPos, out bool hasUI);

            //显示点击特效
            if(GamePlayEntry.UI.IsOpen<TouchButtonEffectUI>()) GamePlayEntry.UI.Hide<TouchButtonEffectUI>();
            GamePlayEntry.UI.OpenUI<TouchButtonEffectUI>();

            if (hasUI)
            {
                return;
            }

            if (ProcessRaycast(clickPos, out E_NODE_TYPE withNode, out int CharIndex))
                return;

            if (obj == null)
                return;

            //点击地面
            if (obj.CompareTag(Tags.Terrain) || obj.CompareTag(Tags.DROP))
            {
                //TODO一些阻止移动的内容

                /*
                if (!RectTransformUtility.ScreenPointToLocalPointInRectangle(
                    TerrainParent.GetComponent<RectTransform>(),
                    clickPos,
                    GamePlayEntry.MainPlayer.TerrainCam,
                    out _clickPoint))
                    return;*/

                if (withNode == E_NODE_TYPE.N_NPC)
                {
                    //TODO 选中NPC
                }

                //TODO 移动 
            }
        }

        #region 双指手势

        protected readonly Transform m_zoom = null;
        private float max = 300f;
        private float min = -300;
        protected static float current = 0;
        private float last = -1;


        public bool Update_DoubleTouch()
        {
            if (false)//有其他和双指互斥的操作则跳出，可补充
                return false;

            if (Input.touchCount == 2)
            {
                float dis = Vector2.Distance(Input.touches[0].position, Input.touches[1].position);//两指之间的距离
                if (-1 == last) last = dis;
                float result = dis - last;//与上一帧比较变化
                if (result + current < min)//区间限制：最小
                    result = min - current;
                else if (result + current > max)//区间限制：最大
                    result = max - current;
                result *= 0.1f;//系数

                //TODO 可根据Result结果处理

                current += result;//累计当前
                last = dis;//记录为上一帧的值
                return true;
            }
            else
            {
                last = -1;//不触发逻辑时
                return false;
            }
        }
        #endregion
    }
}