using System.Collections;
using System.Collections.Generic;
using UnityEngine;


public class rectSelect : MonoBehaviour
{
    bool canSelect = false;
    bool isDrag = false;
    Manager man = null;
    public Texture2D mouseCursor;
    Vector2 p1, p2;

    float rectAlpha = 1f;
    bool rectAlphaDir = false;
    float rectW = 1000f;
    float rectH = 1000f;
    public Texture2D boxTexture;

    void Start()
    {
        man = GameObject.Find("Manager").GetComponent<Manager>();
    }

    void Update()
    {
        if (!canSelect) return;
        if (!isDrag && Input.GetMouseButtonDown(0))
        {
            isDrag = true;
            p1 = Input.mousePosition;
        }
        if (isDrag && Input.GetMouseButtonUp(0))
        {
            isDrag = false; canSelect = false;
            Cursor.SetCursor(null, Vector2.zero, CursorMode.ForceSoftware);
            
            //p1 = new Vector3(p1.x, Screen.height - p1.y, p1.z);
            //p2 = new Vector3(Input.mousePosition.x, Screen.height - Input.mousePosition.y, Input.mousePosition.z);
            //if (man == null) Start(); 
            //Vector3 g1 = man.cam.ScreenToWorldPoint(p1);
            //Vector3 g2 = man.cam.ScreenToWorldPoint(p2);
            //GameObject.Find("Panel1Content").GetComponent<ScrollViewAdapterPanel1>().InsActShowRect(g1.x, g1.y, g1.z, g2.x, g2.y, g2.z);

            Vector2 g1 = GUIUtility.ScreenToGUIPoint(p1);
            Vector2 g2 = GUIUtility.ScreenToGUIPoint(p2);
            //float scrCoef = ((float)Screen.width / (float)Screen.height) / (16f / 9f);
            int x1 = (int)( rectW * ( (p1.x - Screen.width/2f) / Screen.width) );
            int y1 = (int)( rectH * ( (Screen.height/2f - p1.y) / (Screen.height)) ); // *scrCoef приводим высоту экрана к соотношению 16:9
            int x2 = (int)( rectW * ( (p2.x - Screen.width / 2f) / Screen.width) );
            int y2 = (int)( rectH * ( (Screen.height / 2f - p2.y) / (Screen.height)) ); //* scrCoef
            GameObject.Find("Panel1Content").GetComponent<ScrollViewAdapterPanel1>().InsActShowRect(x1, y1, x2, y2);
        }
    }

    void DrawLine(float x1, float y1, float x2, float y2, float a = 1f)
    {
        Vector2 pointA = new Vector2(x1, Screen.height - y1);
        Vector2 pointB = new Vector2(x2, Screen.height - y2);
        Texture2D lineTex = new Texture2D(1, 1);
        Matrix4x4 matrixBackup = GUI.matrix;
        float width = 3.0f;
        GUI.color = new Color(0, 1, 0, a);
        float angle = Mathf.Atan2(pointB.y - pointA.y, pointB.x - pointA.x) * 180f / Mathf.PI;
        GUIUtility.RotateAroundPivot(angle, pointA);
        GUI.DrawTexture(new Rect(pointA.x - width / 2f, pointA.y-width/2f, Mathf.Max(Mathf.Abs(pointA.x - pointB.x), Mathf.Abs(pointA.y - pointB.y)), width), lineTex);//lineTex   Mathf.Abs(pointA.x-pointB.x), Mathf.Abs(pointA.y - pointB.y)
        GUI.matrix = matrixBackup;
    }
    void OnGUI()
    {
        if (!canSelect || !isDrag) return;
        if (man.mode != "scedit") return;
        p2 = Input.mousePosition;
        Vector2 g1 = GUIUtility.ScreenToGUIPoint(p1);
        Vector2 g2 = GUIUtility.ScreenToGUIPoint(p2);

        DrawLine(g1.x, g1.y, g2.x, g1.y, rectAlpha);
        DrawLine(g2.x, g1.y, g2.x, g2.y, rectAlpha);
        DrawLine(g2.x, g2.y, g1.x, g2.y, rectAlpha);
        DrawLine(g1.x, g2.y, g1.x, g1.y, rectAlpha);

        if (rectAlphaDir)
            rectAlpha += 0.004f;
        else
            rectAlpha -= 0.004f;
        if (rectAlphaDir && rectAlpha >= 1f) { rectAlpha = 1f; rectAlphaDir = false; }
        if (!rectAlphaDir && rectAlpha <= 0.3f) { rectAlpha = 0.3f; rectAlphaDir = true; }
    }
    public void StartSelectRect()
    {
        if (man.mode != "scedit") return;
        canSelect = true;
        Vector2 hotSpot = new Vector2(24, 24);
        Cursor.SetCursor(mouseCursor, hotSpot, CursorMode.Auto);
    }

}