var UID = {
  _current: 0,
  getNew: function(){
    this._current++;
    return this._current;
  }
};

HTMLElement.prototype.pseudoStyle = function(element,prop,value){
  var _this = this;
  var _sheetId = "pseudoStyles";
  var _head = document.head || document.getElementsByTagName('head')[0];
  var _sheet = document.getElementById(_sheetId) || document.createElement('style');
  _sheet.id = _sheetId;
  var className = "pseudoStyle" + UID.getNew();
  
  _this.className +=  " "+className; 
  
  _sheet.innerHTML += " ."+className+":"+element+"{"+prop+":"+value+"}";
  _head.appendChild(_sheet);
  return this;
};

class Sandpoints extends Paged.Handler {
  constructor(chunker, polisher, caller) {
    super(chunker, polisher, caller);
  }

  beforeParsed(content) {
    var d = {};
    content.querySelectorAll('*').forEach((n, i)=> {
      if (n.hasAttribute("printhref")) {
        n.setAttribute("href", n.getAttribute("printhref"))
      }

      if (n.classList.length > 0 ) {
        n.classList.forEach((c, i)=>{
          if (c.startsWith("css-")) {
            (c in d) ? d[c]++ : d[c] = 1
            let s = ""
            Object.keys(d).filter(ks => ks.startsWith(c.slice(0, -1))).forEach((t, i)=> {if (c >= t) {s += `${d[t]}.`}}) 
            n.pseudoStyle('before','content', `"${s} "`)
          }
        })
      }
    })
  }

  afterPageLayout(pageElement, page, breakToken, chunker) {
        // Find all split table elements
        let tables = pageElement.querySelectorAll("table[data-split-from]");

        tables.forEach((table) => {
            // There is an edge case where the previous page table 
            // has zero height (isn't visible).
            // To avoid double header we will only add header if there is none.
            let tableHeader = table.querySelector("thead");
            if (tableHeader) {
                return;
            }

            // Get the reference UUID of the node
            let ref = table.dataset.ref;
            // Find the node in the original source
            let sourceTable = chunker.source.querySelector("[data-ref='" + ref + "']");

            // Find if there is a header
            let sourceHeader = sourceTable.querySelector("thead");
            if (sourceHeader) {
                // Clone the header element
                let clonedHeader = sourceHeader.cloneNode(true);
                // Insert the header at the start of the split table
                table.insertBefore(clonedHeader, table.firstChild);
            }
        });

        // Find all tables
        tables = pageElement.querySelectorAll("table");

        // special case which might not fit for everyone
        tables.forEach((table) => {
            // if the table has no rows in body, hide it.
            // This happens because my render engine creates empty tables.
            let sourceBody = table.querySelector("tbody > tr");
            if (!sourceBody) {
                console.log("Table was hidden, because it has no rows in tbody.");
                table.style.visibility = "hidden";
                table.style.position = "absolute";

                var lineSpacer = table.nextSibling;
                if (lineSpacer) {
                    lineSpacer.style.visibility = "hidden";
                    lineSpacer.style.position = "absolute";
                }
            }
        });
  }
}

Paged.registerHandlers(Sandpoints);