Could someone help me figure out which part of this code relates to mouse button click simulation please?

 using UnityEngine;
 using System.Collections;
 using System;
 using System.Runtime.InteropServices;
 
 public class MouseClickSimulation : MonoBehaviour
 {
     [Flags]
     public enum MouseEventFlags
     {
         LeftDown = 0x00000002,
         LeftUp = 0x00000004,
         MiddleDown = 0x00000020,
         MiddleUp = 0x00000040,
         Move = 0x00000001,
         Absolute = 0x00008000,
         RightDown = 0x00000008,
         RightUp = 0x00000010
     }
 
     [DllImport("user32.dll", EntryPoint = "SetCursorPos")]
     [return: MarshalAs(UnmanagedType.Bool)]
     private static extern bool SetCursorPos(int X, int Y);
 
     [DllImport("user32.dll")]
     [return: MarshalAs(UnmanagedType.Bool)]
     private static extern bool GetCursorPos(out MousePoint lpMousePoint);
 
     [DllImport("user32.dll")]
     private static extern void mouse_event(int dwFlags, int dx, int dy, int dwData, int dwExtraInfo);
 
     public static void SetCursorPosition(int X, int Y)
     {
         SetCursorPos(X, Y);
     }
 
     public static void SetCursorPosition(MousePoint point)
     {
         SetCursorPos(point.X, point.Y);
     }
 
     public static MousePoint GetCursorPosition()
     {
         MousePoint currentMousePoint;
         var gotPoint = GetCursorPos(out currentMousePoint);
         if (!gotPoint) { currentMousePoint = new MousePoint(0, 0); }
         return currentMousePoint;
     }
 
     public static void MouseEvent(MouseEventFlags value)
     {
         MousePoint position = GetCursorPosition();
 
         mouse_event
             ((int)value,
              position.X,
              position.Y,
              0,
              0)
             ;
     }
 
     [StructLayout(LayoutKind.Sequential)]
     public struct MousePoint
     {
         public int X;
         public int Y;
 
         public MousePoint(int x, int y)
         {
             X = x;
             Y = y;
         }
 
     }
 
 
 
     void Update()
     {
         if (Input.GetKeyDown(KeyCode.Joystick1Button0))
           MouseEvent(MouseEventFlags.LeftUp | MouseEventFlags.LeftDown);
     }
 
 }
 

I've used this code to simulate the left mouse click function when i press the "A" button on an xbox controller. It also functions to control mouse movement with directional key input rather than mouse input. I'm hoping to weed out the sections of code that relate to mouse movement and leave behind the functional left click simulation. I've attempted to do that several times but so many of the functions call previously stated functions that whenever i try to remove parts i just end up with errors on top of errors. I think this might be beyond my limited experience. Any help would be greatly appreciated.