export function showTooltip() {
  const fadeSpeed = 300;
  const tooltipID = "#discourse-tooltip";
  const $this = $(this);
  const $parent = $this.offsetParent();
  const content = $this.attr("data-tooltip");
  const retina = window.devicePixelRatio && window.devicePixelRatio > 1 ? "class='retina'" : "";

  let pos = $this.offset();
  const delta = $parent.offset();
  pos.top -= delta.top;
  pos.left -= delta.left;

  $(tooltipID).fadeOut(fadeSpeed).remove();

  $(this).after(`
    <div id="discourse-tooltip" ${retina}>
      <div class="tooltip-pointer"></div>
      <div class="tooltip-content">${content}</div>
    </div>
  `);

  $(window).on("click.discourse", (event) => {
    if ($(event.target).closest(tooltipID).length === 0) {
      $(tooltipID).remove();
      $(window).off("click.discourse");
    }
    return true;
  });

  const $tooltip = $(tooltipID);
  $tooltip.css({top: 0, left: 0});

  let left = (pos.left - ($tooltip.width() / 2) + $this.width()/2);
  if (left < 0) {
    $tooltip.find(".tooltip-pointer").css({
      "margin-left": left*2 + "px"
    });
    left = 0;
  }

  // also do a right margin fix
  const parentWidth = $parent.width();
  if (left + $tooltip.width() > parentWidth) {
    let oldLeft = left;
    left = parentWidth - $tooltip.width();

    $tooltip.find(".tooltip-pointer").css({
      "margin-left": (oldLeft - left) * 2 + "px"
    });
  }

  $tooltip.css({
    top: pos.top + 5 + "px",
    left: left + "px"
  });

  $tooltip.fadeIn(fadeSpeed);

  return false;
}

export function registerTooltip(jqueryContext) {
  if (jqueryContext.length) {
    jqueryContext.on('click', showTooltip);
  }
}

export function unregisterTooltip(jqueryContext) {
  if (jqueryContext.length) {
    jqueryContext.off('click');
  }
}