/*
 *  Simple script which looks for changes in the chat area, and rolls extra damage
 *   based on any relevant hit dice.
 */

function handleMoonslicer(message) {
  var result = message.querySelector('div.sheet-result')

  var rx = /">([0-9]+)<\/span>/ 
  var h0str = result.children[0].children[0].children[0].getAttribute("title");
  var h1str = result.children[2].children[0].children[0].getAttribute("title");
  var hit0 = Number(h0str.match(rx)[1]);
  var hit1 = Number(h1str.match(rx)[1]);

  var input_area = document.getElementById('textchat-input');
  var textarea = input_area.querySelector("textarea");
  var submit_button = input_area.querySelector("button.btn");
  console.log('Hit0: ' + hit0 + ' Hit1: ' + hit1);

  var old_text = textarea.value;
  if (hit0 == 20 || hit1 == 20) {
    textarea.value = "&{template:npcdmg} {{damage=1}} {{dmg1flag=1}} {{dmg1=+[[1d6]]}} {{dmg1type=Ice}}";
    submit_button.click();
  }
  if (hit0 == 19 || hit1 == 19) {
    textarea.value = "&{template:npcdmg} {{damage=1}} {{dmg1flag=1}} {{dmg1=+[[1d4]]}} {{dmg1type=Ice}}";
    submit_button.click();
  }
  if (hit0 == 2 || hit1 == 2) {
    textarea.value = "&{template:npcdmg} {{damage=1}} {{dmg1flag=1}} {{dmg1=[[floor(1d4/2)]]}} {{dmg1type=Ice to self}}}";
    submit_button.click();
  } 
  if (hit0 == 1 || hit1 == 1) {
    textarea.value = "&{template:npcdmg} {{damage=1}} {{dmg1flag=1}} {{dmg1=[[1d6]]} {{dmg1type=Ice to self}}}";
    submit_button.click();
  }
  textarea.value = old_text;
}

/*
Send a message to the page script.
*/
function handleMutation(mutation) {
  mutation.addedNodes.forEach( function(message) {
    if (message.classList && message.classList.contains('you')) {
      var labelElem = message.querySelector('div.sheet-rolltemplate-atk div.sheet-label');
      var label = labelElem.querySelector('span a');
      if (label && label.innerHTML == 'Moonslicer') {
        handleMoonslicer(message);
      };
    };
  });
}

/*
Add messagePageScript() as a listener to click events on
the "from-content-script" element.
*/
var textchat = document.getElementById("textchat");
var content = textchat.getElementsByClassName("content")[0];

var observer = new MutationObserver(function(mutations) {mutations.forEach(handleMutation);});
observer.observe(content, {childList: true});