using AX.InputSystem;
using AX.MessageSystem;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DrawRectSelectRange : MonoBehaviour
{

    private Vector3 mousePosition = Vector3.zero;//记录刚进入框选状态时鼠标的位置
    private bool drawRectStart;//框选画框是否开始
    private Vector3 endPosition = Vector3.zero;

    private Material rectMat = null;
    public Color rectColor = Color.green;
    public Shader LinesColorShader;

    private Camera mainCamera = null;
    private float farPlane = 100;

    // Use this for initialization
    void Start()
    {
        rectMat = new Material(LinesColorShader);//生成画线材质
        rectMat.hideFlags = HideFlags.HideAndDontSave;
        //rectMat.shader.hideFlags = HideFlags.HideAndDontSave;

        mainCamera = GetComponent<Camera>();
        farPlane = mainCamera.farClipPlane;
    }

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

    }

    void OnEnable()
    {
        MessageDispatcher.AddListener("RECTDRAW_ENTER_COMMAND", DrawRectSelectRangeEnter);
        MessageDispatcher.AddListener("RECTDRAWING_COMMAND", DrawRectSelectRanging);
        MessageDispatcher.AddListener("RECTDRAW_EXIT_COMMAND", DrawRectSelectRangeExit);
    }

    void OnDisable()
    {
        MessageDispatcher.RemoveListener("RECTDRAW_ENTER_COMMAND", DrawRectSelectRangeEnter);
        MessageDispatcher.RemoveListener("RECTDRAWING_COMMAND", DrawRectSelectRanging);
        MessageDispatcher.RemoveListener("RECTDRAW_EXIT_COMMAND", DrawRectSelectRangeExit);
    }

    void OnDestroy()
    {
        MessageDispatcher.RemoveListener("RECTDRAW_ENTER_COMMAND", DrawRectSelectRangeEnter);
        MessageDispatcher.RemoveListener("RECTDRAWING_COMMAND", DrawRectSelectRanging);
        MessageDispatcher.RemoveListener("RECTDRAW_EXIT_COMMAND", DrawRectSelectRangeExit);
    }

    private void DrawRectSelectRangeEnter(IMessage obj)
    {
        var data = (DrawRectSelectRangeCmdArgs)obj.Data;
        mousePosition = data.mousePosition;
        drawRectStart = data.drawRectStart;
    }

    private void DrawRectSelectRanging(IMessage obj)
    {
        var data = (DrawRectSelectRangeCmdArgs)obj.Data;
        endPosition = data.mousePosition;
        drawRectStart = data.drawRectStart;
    }

    private void DrawRectSelectRangeExit(IMessage obj)
    {
        var data = (DrawRectSelectRangeCmdArgs)obj.Data;
        mousePosition = data.mousePosition;
        drawRectStart = data.drawRectStart;
    }

    void OnPostRender()
    {
        if (drawRectStart)
        {
            DrawSelectionRectangle(mousePosition, endPosition);

            //没有选中克隆按钮时，画框同时判断是否框选选中并做选中处理；选中克隆按钮时只画框，不做框选选中处理
            if (InputManager.cloneObjType == CloneObjType.None)
            {
                checkSelection(mousePosition, endPosition);
            }
        }
    }

    private void DrawSelectionRectangle(Vector3 start, Vector3 end)
    {
        GL.PushMatrix();//保存摄像机变换矩阵

        if (!rectMat)
            return;

        rectMat.SetPass(0);
        GL.LoadPixelMatrix();//设置用屏幕坐标绘图
        GL.Begin(GL.QUADS);
        GL.Color(new Color(rectColor.r, rectColor.g, rectColor.b, 0.1f));
        GL.Vertex3(start.x, start.y, 0);
        GL.Vertex3(end.x, start.y, 0);
        GL.Vertex3(end.x, end.y, 0);
        GL.Vertex3(start.x, end.y, 0);
        GL.End();
        GL.Begin(GL.LINES);
        GL.Color(rectColor);//设置方框的边框颜色 边框不透明
        GL.Vertex3(start.x, start.y, 0);
        GL.Vertex3(end.x, start.y, 0);
        GL.Vertex3(end.x, start.y, 0);
        GL.Vertex3(end.x, end.y, 0);
        GL.Vertex3(end.x, end.y, 0);
        GL.Vertex3(start.x, end.y, 0);
        GL.Vertex3(start.x, end.y, 0);
        GL.Vertex3(start.x, start.y, 0);
        GL.End();
        GL.PopMatrix();//恢复摄像机矩阵
    }

    private void checkSelection(Vector3 start, Vector3 end)
    {
        Vector3 p1 = Vector3.zero;
        Vector3 p2 = Vector3.zero;

        //这些判断是用来确保p1的xy坐标小于p2的xy坐标，因为画的框不见得就是左下到右上或者左上到右下这个方向
        if (start.x > end.x)
        {
            p1.x = end.x;
            p2.x = start.x;
        }
        else
        {
            p1.x = start.x;
            p2.x = end.x;
        }
        if (start.y > end.y)
        {
            p1.y = end.y;
            p2.y = start.y;
        }
        else
        {
            p1.y = start.y;
            p2.y = end.y;
        }
        if (SelectedObjs.characters.Count>0)
        {
            for (int i = 0; i < SelectedObjs.characters.Count; i++)
            {
                if (SelectedObjs.characters[i] == null)
                {
                    SelectedObjs.characters.Remove(SelectedObjs.characters[i]);
                }
            }
        }
       
        foreach (GameObject obj in SelectedObjs.characters)
        {
            if (obj==null)
            {
                return;
            }
            Vector3 location = mainCamera.WorldToScreenPoint(obj.transform.position);
            if (location.x < p1.x || location.x > p2.x || location.y < p1.y || location.y > p2.y
                || location.z < 0 || location.z > farPlane)
            {//框选范围之外及摄像头视线范围外，不需要选择
                MessageDispatcher.SendMessage(obj, "CANCEL_OBJ_SELECTED");
              //  AddRecordEventSelect(RecordEventType.CancelObjSelected, obj);
            }
            else
            {//否则就进行选中操作
                MessageDispatcher.SendMessage(obj, "OBJ_RECT_SELECTED");
              //  AddRecordEventSelect(RecordEventType.ObjRectSelected, obj);
            }
        }
    }
    private void AddRecordEventSelect(RecordEventType type, GameObject obj)
    {
        if (ReplaySetting.PlayStatus == PlayStatus.isEditor && RecordManager.Instance.recordStatus == RecordStatus.normal)
        {
            var eventData = new EventData();
            eventData.time = RecordManager.Instance.RecordTimer;
            eventData.cloneObjType = CloneObjType.None;
            eventData.eventType = type;
            eventData.json = obj.name;
            RecordManager.Instance.jsonData.eventDataList.Add(eventData);
        }
    }
}