(function() {
  function splitOnWhitespace(trigger) {
    return trigger.split(/\s+/)
  }

  function parseClassOperation(trimmedValue) {
    var split = splitOnWhitespace(trimmedValue)
    if (split.length > 1) {
      var operation = split[0]
      var classDef = split[1].trim()
      var cssClass
      var delay
      if (classDef.indexOf(':') > 0) {
        var splitCssClass = classDef.split(':')
        cssClass = splitCssClass[0]
        delay = htmx.parseInterval(splitCssClass[1])
      } else {
        cssClass = classDef
        delay = 100
      }
      return {
        operation,
        cssClass,
        delay
      }
    } else {
      return null
    }
  }

  function performOperation(elt, classOperation, classList, currentRunTime) {
    setTimeout(function() {
      elt.classList[classOperation.operation].call(elt.classList, classOperation.cssClass)
    }, currentRunTime)
  }

  function toggleOperation(elt, classOperation, classList, currentRunTime) {
    setTimeout(function() {
      setInterval(function() {
        elt.classList[classOperation.operation].call(elt.classList, classOperation.cssClass)
      }, classOperation.delay)
    }, currentRunTime)
  }

  function processClassList(elt, classList) {
    var runs = classList.split('&')
    for (var i = 0; i < runs.length; i++) {
      var run = runs[i]
      var currentRunTime = 0
      var classOperations = run.split(',')
      for (var j = 0; j < classOperations.length; j++) {
        var value = classOperations[j]
        var trimmedValue = value.trim()
        var classOperation = parseClassOperation(trimmedValue)
        if (classOperation) {
          if (classOperation.operation === 'toggle') {
            toggleOperation(elt, classOperation, classList, currentRunTime)
            currentRunTime = currentRunTime + classOperation.delay
          } else {
            currentRunTime = currentRunTime + classOperation.delay
            performOperation(elt, classOperation, classList, currentRunTime)
          }
        }
      }
    }
  }

  function maybeProcessClasses(elt) {
    if (elt.getAttribute) {
      var classList = elt.getAttribute('classes') || elt.getAttribute('data-classes')
      if (classList) {
        processClassList(elt, classList)
      }
    }
  }

  htmx.defineExtension('class-tools', {
    onEvent: function(name, evt) {
      if (name === 'htmx:afterProcessNode') {
        var elt = evt.detail.elt
        maybeProcessClasses(elt)
        var classList = elt.getAttribute("apply-parent-classes") || elt.getAttribute("data-apply-parent-classes");
        if (classList) {
          var parent = elt.parentElement;
          parent.removeChild(elt);
          parent.setAttribute("classes", classList);
          maybeProcessClasses(parent);
        } else if (elt.querySelectorAll) {
          var children = elt.querySelectorAll('[classes], [data-classes]')
          for (var i = 0; i < children.length; i++) {
            maybeProcessClasses(children[i])
          }
        }
      }
    }
  })
})()