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

public class FireDeployCameraManager : MonoBehaviour
{
    public Transform target;
    public float mSpeed = 50;
    public float distance = 100, minDistance = 15, maxDistance = 200;
    public bool needDamping = true;
    public float damping = 5.0f;

    private Vector3 position = new Vector3();

    private float mouseScroll = 0.0f;

    private Vector3 prevPos = Vector3.zero;//进入拖动过程前（开始拖动）时鼠标在屏幕坐标系中的位置
    private Vector3 mousePostion = Vector3.zero;
    private bool dragStart;

    private float distanceResult;

    // Use this for initialization
    void Awake()
    {
        target = GameObject.Find("FireDeployCameraTarget").transform;
    }

    private void Start()
    {
        transform.gameObject.SetActive(false);
    }

    // Update is called once per frame
    void LateUpdate()
    {
        if (target)
        {
            if (dragStart)
                UpdateCameraTargetHorizontalPos();

            UpdateCameraScale();

            UpdateCameraState();
        }
    }
    float a = 100;
    /// <summary>
    /// 更新鼠标滚动操作传人的数据
    /// </summary>
    public void UpdateCameraScaleData(float mouseScrollData, float distanceRslt)
    {
        //Debug.Log("++++++");

        mouseScroll = mouseScrollData;
        distanceResult = distanceRslt;

        //a -= mouseScroll * mSpeed;
        //a = Mathf.Clamp(a, minDistance, maxDistance);
        //if (mouseScroll == 0 && distanceResult != 0)
        //{
        //    a = distanceResult;
        //}

        //Debug.Log(transform.GetComponent<Camera>().orthographicSize + " / " + a + " = " + transform.GetComponent<Camera>().orthographicSize / a);
    }

    /// <summary>
    /// 更新鼠标左键按住状态下，鼠标移动操作开始传入的数据
    /// </summary>
    public void UpdateDragEnterData(Vector3 mousePos, bool draging)
    {
        mousePostion = mousePos;
        dragStart = draging;

        var screenSpace = GetComponent<Camera>().WorldToScreenPoint(target.position);
        prevPos = new Vector3(mousePostion.x, mousePostion.y, screenSpace.z);
    }

    /// <summary>
    /// 更新鼠标左键按住状态下，鼠标移动操作过程中传入的数据
    /// </summary>
    /// <param name="mousePos"></param>
    public void UpdateDragingData(Vector3 mousePos, bool draging)
    {
        mousePostion = mousePos;

        dragStart = draging;
    }

    /// <summary>
    /// 更新鼠标左键按住状态下，鼠标移动操作结束传入的数据
    /// </summary>
    /// <param name="mousePos"></param>
    public void UpdateDragExitData(Vector3 mousePos, bool draging)
    {
        prevPos = mousePos;

        dragStart = draging;
    }

    /// <summary>
    /// 缩放，平移相机后，更新其位置，旋转状态
    /// </summary>
    private void UpdateCameraState()
    {
        Vector3 disVector = new Vector3(0.0f, distance, 0.0f);
        position = disVector + target.position;

        if (needDamping)
        {
            transform.position = Vector3.Lerp(transform.position, position, Time.deltaTime * damping);

            transform.GetComponent<Camera>().orthographicSize = distance;
            //Debug.Log(transform.GetComponent<Camera>().orthographicSize);
        }
        else
        {
            transform.position = position;
            transform.GetComponent<Camera>().orthographicSize = distance;
        }
    }

    /// <summary>
    /// 相机缩放
    /// </summary>
    private void UpdateCameraScale()
    {
        distance -= mouseScroll * mSpeed;
        distance = Mathf.Clamp(distance, minDistance, maxDistance);

        if (mouseScroll == 0 && distanceResult != 0)
        {
            distance = distanceResult;
        }
    }

    /// <summary>
    /// 相机水平移动
    /// </summary>
    private void UpdateCameraTargetHorizontalPos()
    {
        if (mousePostion.x > Screen.width || mousePostion.y > Screen.height)
        {
            return;
        }
        var screenSpace = GetComponent<Camera>().WorldToScreenPoint(target.position);

        var currPos = new Vector3(mousePostion.x, mousePostion.y, screenSpace.z);

        var prev = GetComponent<Camera>().ScreenToWorldPoint(prevPos);
        var curr = GetComponent<Camera>().ScreenToWorldPoint(currPos);

        var offset = (curr - prev);

        offset.y = 0;

        target.position += -offset;

        //MessageDispatcher.SendMessage("UPDATE_FIREDEPOLY_OBJ_POS", new KeyValuePair<Vector3, Vector3>(prevPos, currPos));
        prevPos = currPos;
    }
}