function addElement(RestoreData = null,refClass,props) {
  let newElement = new refClass(RestoreData,logicEngine,...props);

  if (!RestoreData) {
    let x = Math.round(logicEngine.Canvas.width / 2);
    let y = Math.round(logicEngine.Canvas.height / 2);
    let width = newElement.Width;
    let height = newElement.Height;

    let noclearspot = true;
    while (noclearspot) {
      if (!logicEngine.ActiveContainer.checkOverlayBounds(x, y, width, height)) {
        noclearspot = false;
      } else {
        x += Math.floor(Math.random() * (width - (width - (width * 2)))) + (width - (width * 2));
        y += Math.floor(Math.random() * (height - (height - (height * 2)))) + (height - (height * 2));
        if (x < 0) x = 0;
        if (y < 0) y = 0;
        if (x + width > logicEngine.Canvas.width) x = logicEngine.Canvas.width - width;
        if (y + height > logicEngine.Canvas.height) y = logicEngine.Canvas.height - height;
      }
    }
    newElement.X = x;
    newElement.Y = y;
  }
  logicEngine.ActiveContainer.AddElement(newElement);
  logicEngine.ActiveContainer.Select(newElement);
  return newElement;
}

function setCookie(cname, cvalue, exdays) {
  let d = new Date();
  d.setTime(d.getTime() + (exdays*24*60*60*1000));
  let expires = "expires="+ d.toUTCString();
  document.cookie = cname + '="' + cvalue + '";' + expires;
  localStorage.setItem(cname,cvalue);
}

function getCookie(cname) {
  let name = cname + "=";
  let decodedCookie = decodeURIComponent(document.cookie);
  let ca = decodedCookie.split(';');
  for(var i = 0; i <ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0) == ' ') {
      c = c.substring(1);
    }
    if (c.indexOf(name) == 0) {
      return c.substring(name.length, c.length);
    }
  }
  return localStorage.getItem(cname);
}

function CheckForWelcomeCookie() {
  if (getCookie("hidewelcomescreen")) {
    let WelcomeScreen = document.getElementById("WelcomeWindow");
    let DarkOverlay = document.getElementById("darkout-overlay");
    WelcomeScreen.style.display = "none";
    DarkOverlay.style.display = "none";
  }
}

function getMousePos(canvas, evt) {
  let rect = canvas.getBoundingClientRect();
  return {
    x: evt.clientX - rect.left,
    y: evt.clientY - rect.top
  };
}

function averageArray(arr) {
  return arr.reduce((a, b) => (a + b)) / arr.length;
}

function length2D(x1,y1,x2,y2) {
  let xDist = x1 - x2;
  let yDist = y1 - y2;
  return Math.sqrt(xDist*xDist + yDist * yDist);
}

function getElementInfo(element) {
  for (let a = 0; a < ElementReferenceTable.length; a++) {
    if (ElementReferenceTable[a].Name == element) return ElementReferenceTable[a];
  }
  return false;
}

function isVersionNewer(version1,version2,orEqual = true) {
  let v1 = version1.split(".");
  let v2 = version1.split(".");
  if (v1.length != 3) return false;
  if (v2.length != 3) return false;
  for (let a = 0; a < 3; a++) {
    v1[a] = parseInt(v1[a]);
    v2[a] = parseInt(v2[a]);
  }
  if (v1[0] > v2[0]) return true;
  if (v1[0] == v2[0] && v1[1] > v2[1]) return true;
  if (v1[0] == v2[0] && v1[1] == v2[1] && v1[2] > v2[2]) return true;
  if ((v1[0] == v2[0] && v1[1] == v2[1]) && (orEqual && v1[2] == v2[2])) return true;
  return false;
}

function createSaveState(container = false) {
  let saveState = {
    Name: "LogicDesign",
    Version: Version,
    Timestamp: Date.now(),
    Elements: new Array()
  };
  if (container.Elements.length > 0) saveState.Elements = container.Elements;
  return saveState;
}

function download(filename, savestate) {
  let text = JSON.stringify(savestate);
  let element = document.createElement('a');
  element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
  element.setAttribute('download', filename);

  element.style.display = 'none';
  document.body.appendChild(element);

  element.click();

  document.body.removeChild(element);
}

function loadsave(savedata) {
  if (!savedata) return false;
  if (!savedata.Version) return false;  // TODO: Let the person know invalid save file
  if (!isVersionNewer(savedata.Version,"0.3.0")) return false; // TODO: Let the person know the version is too old
  let newContainer = new elementContainer();
  let elementConnections = new Array();
  for (let a = 0; a < savedata.Elements.length; a++) {
    let classRef = getElementInfo(savedata.Elements[a].Name).Class;
    let newElement = new classRef(savedata.Elements[a],logicEngine,savedata.Elements[a].Args);
    newContainer.AddElement(newElement);
    newElement.Designator = savedata.Elements[a].Designator;
    if (savedata.Elements[a].Outputs) {
      if (savedata.Elements[a].Outputs.length > 0) {
        for (let b=0; b < savedata.Elements[a].Outputs.length; b++) {
          elementConnections.push({
            FromElement: newElement,
            Input: savedata.Elements[a].Outputs[b].Input,
            ToElement: savedata.Elements[a].Outputs[b].Element
          });
        }
      }
    }
  }
  // Now we need to make all of the connections
  for (let a = 0; a < elementConnections.length; a++) {
    let toElement = newContainer.HasElement(elementConnections[a].ToElement);
    if (toElement) {
      let newConnection = new ElementConnection(newContainer,toElement,elementConnections[a].Input);
      elementConnections[a].FromElement.OutputConnections.push(newConnection);
    }
  }
  logicEngine.ActiveContainer = newContainer;
  return true;
}