how to detect a mobile double tap, and a long press. PS. I already have swipe detected.

hello, i have a 2d game that I need it to detect a mobile double tap and a long press. and again I already have Swipes figured out. the problem is I don't know how to detect a double tap and a long press tap. heres my code for the swipe detection. P.S. the GUI acts like a debug that tells me that my swipe is working perfectly.

 public void DetectSwipe ()
     {
         if (Input.touches.Length > 0) {
             Touch t = Input.GetTouch(0);
             
             if (t.phase == TouchPhase.Began) {
                 firstPressPos = new Vector2(t.position.x, t.position.y);
             }
             
             if (t.phase == TouchPhase.Ended) {
                 secondPressPos = new Vector2(t.position.x, t.position.y);
                 currentSwipe = new Vector3(secondPressPos.x - firstPressPos.x, secondPressPos.y - firstPressPos.y);
                 
                 // Make sure it was a legit swipe, not a tap
                 if (currentSwipe.magnitude < minSwipeLength) {
                     swipeDirection = Swipe.None;
                     return;
                 }
                 
                 currentSwipe.Normalize();
                 
                 // Swipe up
                 if (currentSwipe.y > 0 && currentSwipe.x > -0.5f && currentSwipe.x < 0.5f) {
                     swipeDirection = Swipe.Up;
                     Debug.Log ("SwipeUp");
                     changeDirection = 1;
                     // Swipe down
                 } else if (currentSwipe.y < 0 && currentSwipe.x > -0.5f && currentSwipe.x < 0.5f) {
                     swipeDirection = Swipe.Down;
                     Debug.Log ("SwipDown");
                     changeDirection = 2;
                     // Swipe left
                 } else if (currentSwipe.x < 0 && currentSwipe.y > -0.5f && currentSwipe.y < 0.5f) {
                     swipeDirection = Swipe.Left;
                     Debug.Log ("SwipeLeft");
                     changeDirection= 3;
                     // Swipe right
                 } else if (currentSwipe.x > 0 && currentSwipe.y > -0.5f && currentSwipe.y < 0.5f) {
                     swipeDirection = Swipe.Right;
                     Debug.Log ("SwipeRight");
                     changeDirection = 4;
                 }
             }
         } else {
             
             if (Input.GetMouseButtonDown(0)) {
                 firstClickPos = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
             } else {
                 swipeDirection = Swipe.None;
                 //Debug.Log ("None");
             }
             if (Input.GetMouseButtonUp (0)){
                 secondClickPos = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
                 currentSwipe = new Vector3(secondClickPos.x - firstClickPos.x, secondClickPos.y - firstClickPos.y);
                 
                 // Make sure it was a legit swipe, not a tap
                 if (currentSwipe.magnitude < minSwipeLength) {
                     swipeDirection = Swipe.None;
                     return;
                 }
                 
                 currentSwipe.Normalize();
                 
                 //Swipe directional check
                 // Swipe up
                 if (currentSwipe.y > 0 && currentSwipe.x > -0.5f && currentSwipe.x < 0.5f) {
                     swipeDirection = Swipe.Up;
                     // Swipe down
                     Debug.Log ("SwipeUp");
                     changeDirection = 1;
                 } else if (currentSwipe.y < 0 && currentSwipe.x > -0.5f && currentSwipe.x < 0.5f) {
                     swipeDirection = Swipe.Down;
                     // Swipe left
                     Debug.Log ("SwipDown");
                     changeDirection = 2;
                 } else if (currentSwipe.x < 0 && currentSwipe.y > -0.5f && currentSwipe.y < 0.5f) {
                     swipeDirection = Swipe.Left;
                     Debug.Log ("SwipeLeft");
                     changeDirection= 3;
                     // Swipe right
                 } else if (currentSwipe.x > 0 && currentSwipe.y > -0.5f && currentSwipe.y < 0.5f) {
                     swipeDirection = Swipe.Right;
                     Debug.Log ("SwipeRight");
                     changeDirection = 4;
                 }
             }
             
         }
     }
     void OnGUI()
     {
         if(changeDirection== 1)
         {
             GUI.Box(new Rect(400,10,100,90), "Up");
         }
         if(changeDirection == 2)
         {
             GUI.Box(new Rect(400,10,100,90), "Down");
         }
         if(changeDirection == 3)
         {
             GUI.Box(new Rect(400,10,100,90), "Left");
         }
         if(changeDirection == 4)
         {
             GUI.Box(new Rect(400,10,100,90), "Right");
         }
 
     }
 
 }