// ==UserScript==
// @name               Opera Browser Rocker+Mouse Gestures
// @namespace          OperaBrowserGestures
// @description        This script works on any browser and simulates the Opera Browser Mouse and Rocker Gestures, but with this script you can modify or disable them as you want.
// @version            0.0.4
// @author             hacker09
// @include            *
// @icon               https://www.google.com/s2/favicons?domain=www.opera.com
// @grant              GM_registerMenuCommand
// @grant              GM_openInTab
// @grant              window.close
// @grant              GM_setValue
// @grant              GM_getValue
// @run-at             document-end
// @downloadURL none
// ==/UserScript==

// *** Mouse Gesture Settings Below *****************************************************************************************************************************************
GM_registerMenuCommand("Enable/Disable Mouse Gestures", MouseGestures); //Adds an option to the tampermonkey menu
if (GM_getValue("MouseGestures") !== true && GM_getValue("MouseGestures") !== false) { //If the value doesn't exist define as true
  GM_setValue("MouseGestures", true); //Defines the variable as true
} //Finishes the if condition

function MouseGestures() //Function to enable or disable the MouseGestures
{ //Starts the function MouseGestures
  if (GM_getValue("MouseGestures") === true) { //If the last config was true, set as false
    GM_setValue("MouseGestures", false); //Defines the variable as false
  } //Finishes the if condition
  else { //If the last config was false, set as true
    GM_setValue("MouseGestures", true); //Defines the variable as true
    location.reload(); //Reloads the page
  } //Finishes the else condition
} //Finishes the function MouseGestures

if (GM_getValue("MouseGestures") === true) //If the MouseGestures is enabled
{ //Starts the if condition
  const SENSITIVITY = 3; // Adjust the script mouse senvity here between 1 ~ 5
  const TOLERANCE = 3; // Adjust the script mouse tolerance here between  1 ~ 5

  const funcs = { //Variable to store the functions

    'L': function() { //Function that will run when the mouse movement Left is performed
      window.history.back(); //Go Back
    }, //Finishes the mouse movement Left

    'R': function() { //Function that will run when the mouse movement Right is performed
      window.history.forward(); //Go Foward
    }, //Finishes the mouse movement Right

    'D': function() { //Function that will run when the mouse movement Down is performed
      if (IsShiftNotPressed) { //If the shift key isn't being pressed
        GM_openInTab(link, { //Open the link on a new tab
          active: true, //Focus on the new tab
          insert: true, //Insert the new tab after the actual tab
          setParent: true //Return to the tab the user was in
        }); //Open the link that was hovered
        setTimeout(function() { //Starts the settimeout function
          link = 'about:newtab'; //Make the script open a new browser tab if no links were hovered
        }, 100); //Finishes the settimeout function
      } //Finishes the if condition
      IsShiftNotPressed = true; //Variable to hold the shift key status
    }, //Finishes the mouse movement Down

    'UD': function() { //Function that will run when the mouse movement Up+Down is performed
      window.location.reload(); //Reload the Tab
    }, //Finishes the mouse movement Up+Down

    'DR': function() { //Function that will run when the mouse movement Down+Right is performed
      window.top.close(); //Close the tab
    }, //Finishes the mouse movement Down+Right

    'DU': function() { //Function that will run when the mouse movement Down+Up is performed
      GM_openInTab(link, { //Open the link that was hovered
        active: false, //Don't focus on the new tab
        insert: true, //Insert the new tab after the actual tab
        setParent: true //Return to the tab the user was in
      }); //Open the link that was hovered on a new background tab
      setTimeout(function() { //Starts the setimeout function
        link = 'about:newtab'; //Make the script open a browser tab if no links were hovered
      }, 100); //Finishes the setimeout function
    } //Finishes the mouse movement Down+Up

  }; //Finishes the variable to store the functions


  // *** Below this line is the math codes that track the mouse movement gestures *******************************************************************************************
  const s = 1 << ((7 - SENSITIVITY) << 1);
  const t1 = Math.tan(0.15708 * TOLERANCE),
    t2 = 1 / t1;

  let x, y, path;

  const tracer = function(e) {
    let cx = e.clientX,
      cy = e.clientY,
      deltaX = cx - x,
      deltaY = cy - y,
      distance = deltaX * deltaX + deltaY * deltaY;
    if (distance > s) {
      let slope = Math.abs(deltaY / deltaX),
        direction = '';
      if (slope > t1) {
        direction = deltaY > 0 ? 'D' : 'U';
      } else if (slope <= t2) {
        direction = deltaX > 0 ? 'R' : 'L';
      }
      if (path.charAt(path.length - 1) !== direction) {
        path += direction;
      }
      x = cx;
      y = cy;
    }
  };

  window.addEventListener('mousedown', function(e) { //Add an advent listener to the page to detect when the mouse is clicked
    if (e.which === 3) { //Starts the if condition
      x = e.clientX;
      y = e.clientY;
      path = "";
      window.addEventListener('mousemove', tracer, false); //Add an advent listener to the page to detect the mouse position
    } //Finishes the if condition
  }, false); //Finishes the advent listener

  window.addEventListener('contextmenu', function(e) { //When the right click button is released
    window.removeEventListener('mousemove', tracer, false); //Stop tracking the mouse movements
    if (path !== "") { //Starts the if condition
      e.preventDefault(); //Prevent the default context menu from being opened
      if (funcs.hasOwnProperty(path)) { //Starts the if condition
        funcs[path]();
      } //Finishes the if condition
    } //Finishes the if condition
  }, false); //Finishes the advent listener

  var link; //Make the variable global
  Array.from(document.querySelectorAll('a')).forEach(Element => Element.onmouseover = function() { //Get all the a link elements and add an advent listener to the link element
    link = this.href; //Store the actual hovered link to a variable
  }); //Finishes the forEach

  var IsShiftNotPressed = true; //Variable to hold the shift key status
  window.addEventListener("contextmenu", function(e) { //Adds an advent listener to the page to know when the shift key is pressed or not
    if (e.shiftKey) { //If the shift key was pressed
      window.open(link, '_blank', 'height=' + window.screen.height + ',width=' + window.screen.width); //Open the link on a new window
      IsShiftNotPressed = false; //Variable to hold the shift key status
    } //Finishes the if condition
    if (LeftClicked) { //If Right was Clicked and then Left Click was released
      e.preventDefault(); //Prevent the default context menu from being opened
      e.stopPropagation(); //Prevent the default context menu from being opened
    } //Finishes the if condition
  }, false); //Finishes the advent listener

} //Finishes the if condition

// *** Rocker Mouse Gesture Settings Below ***************************************************************************************************************************
GM_registerMenuCommand("Enable/Disable Rocker Mouse Gestures", RockerMouseGestures); //Adds an option to the tampermonkey menu
if (GM_getValue("RockerMouseGestures") !== true && GM_getValue("RockerMouseGestures") !== false) { //If the value doesn't exist define as false
  GM_setValue("RockerMouseGestures", false); //Defines the variable as false
} //Finishes the if condition

function RockerMouseGestures() //Function to enable or disable the RockerMouseGestures
{ //Starts the function RockerMouseGestures
  if (GM_getValue("RockerMouseGestures") === true) { //If the last config was true, set as false
    GM_setValue("RockerMouseGestures", false); //Defines the variable as false
  } //Finishes the if condition
  else { //If the last config was false, set as true
    GM_setValue("RockerMouseGestures", true); //Defines the variable as true
    location.reload(); //Reloads the page
  } //Finishes the else condition
} //Finishes the function RockerMouseGestures

if (GM_getValue("RockerMouseGestures") === true) //If the RockerMouseGestures is enabled
{ //Starts the if condition
  var LeftClicked, RightClicked; //Make these variables global
  window.addEventListener("mousedown", function(e) { //Detect the right and left mouse clicks presses on the page
    switch (e.button) { //Start the switch condition
      case 0: //If Left Click was Pressed
        LeftClicked = true; //Set the variable LeftClicked as true
        break; //Don't execute the lines below if the Left Key was Pressed
      case 2: //If Right Click was Pressed
        RightClicked = true; //Set the variable RightClicked as true
        break; //Don't execute the lines below if the Right Key was Pressed
    } //Finishes the switch condition
  }, false); //Finishes the adventlistener mousedown

  window.addEventListener("mouseup", function(e) { //Detect the right and left mouse clicks releases on the page
    switch (e.button) { //Start the switch condition
      case 0: //If Left Click was released
        LeftClicked = false; //Set the variable LeftClicked as false
        break; //Don't execute the lines below if the Left Key was Pressed
      case 2: //If Right Click was released
        RightClicked = false; //Set the variable RightClicked as false
        break; //Don't execute the lines below if the Left Key was Pressed
    } //Finishes the switch condition
    if (LeftClicked && RightClicked === false) { //If Left was Clicked and then Right Click was released
      window.history.back(); //Go Back
    } //Finishes the if condition
    if (RightClicked && LeftClicked === false) { //If Right was Clicked and then Left Click was released
      window.history.forward(); //Go Foward
    } //Finishes the if condition
  }, false); //Finishes the adventlistener mouseup
} //Finishes the if condition