import { action, observable } from "mobx";
import * as React from "react";

interface DividerProps {
  index: number
  xMargin: number
  setColumnStartXCoords: (movementX: number, colIndex: number) => void
}

export default class Divider extends React.Component<DividerProps>{
  @observable private isHoverActive = false;
  @observable private isResizingActive = false;
  
  @action
  private registerResizing = (e: React.PointerEvent<HTMLDivElement>) => {
      e.stopPropagation();
      e.preventDefault();
      window.removeEventListener("pointermove", this.onPointerMove);
      window.removeEventListener("pointerup", this.onPointerUp);
      window.addEventListener("pointermove", this.onPointerMove);
      window.addEventListener("pointerup", this.onPointerUp);
      this.isResizingActive = true;
  }

  @action
  private onPointerUp = () => {
      this.isResizingActive = false;
      this.isHoverActive = false;
      window.removeEventListener("pointermove", this.onPointerMove);
      window.removeEventListener("pointerup", this.onPointerUp);
  }

  @action
  onPointerMove = ({ movementX }: PointerEvent) => {
    this.props.setColumnStartXCoords(movementX, this.props.index)
  }
  
  render() {
    return (
      <div className="columnResizer"
        style={{
          display: "flex", 
          alignItems: "center", 
          cursor: "col-resize"
        }}
        onPointerEnter={action(() => this.isHoverActive = true)}
        onPointerLeave={action(() => !this.isResizingActive && (this.isHoverActive = false))}
      >
        <div className="columnResizer-handler" onPointerDown={e => this.registerResizing(e)}
          style={{
            height: "95%",
            width: 12,
            borderRight: "4px solid #282828",
            borderLeft: "4px solid #282828",
            margin: "0px 10px"
          }}
        />
      </div>
    )
  }
}