/*
    Adds row hiding ability to tables of class "wikitable".
    
    Based on "Table sorting script" at
    http://en.wikipedia.org/skins-1.5/common/wikibits.js?227
*/



/*
    testing
*/
var MAX_DUMP_DEPTH = 1;
function dumpObj(obj, name, indent, depth) {
      if (depth > MAX_DUMP_DEPTH) {
             return indent + name + ": <Maximum Depth Reached>\n";
      }

      if (typeof obj == "object") {
             var child = null;
             var output = indent + name + "\n";
             indent += "\t";
             for (var item in obj)
             {
                   try {
                          child = obj[item];
                   } catch (e) {
                          child = "<Unable to Evaluate>";
                   }
                   if (typeof child == "object") {
                          output += dumpObj(child, item, indent, depth + 1);
                   } else {
                          output += indent + item + ": " + child + "\n";
                   }
             }
             return output;
      } else {
             return obj;
      }
}
/*
    /testing
*/



/*
    initialisation
*/

function hiderows_init()
{
    var tables = document.getElementsByClassName("wikitable");
    var idnum = 0;
     
    // for each table of class wikitable in the document
    for (var ti = 0; ti < tables.length; ti++) {

        if (!tables[ti].id) {
            tables[ti].setAttribute('id','hr_table_id_' + idnum);
            ++idnum;
        }

        hr_tuneTable(tables[ti]);

    }
}

function hr_tuneTable(table)
{
    hr_makeRowsHideable(table);
    hr_addFooterControls(table);
}

function hr_makeRowsHideable(table)
{
    var rows = table.getElementsByTagName("tr");
    var idnum = 0;

    // for each row in the table
    for (var ri = 0; ri < rows.length; ri++) {
        if (!rows[ri].id) {
            rows[ri].setAttribute('id','hideable_row_id_' + idnum);
            ++idnum;
        }
        
        // add hide button
        hr_makeRowHideable(rows[ri]);
    }

}

// adds hide button and hide checkbox
function hr_makeRowHideable(row) 
{
    // insert a cell on the top left
    var cell = row.insertCell(0);

    // http://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-6986576
    cell.innerHTML += '&nbsp;&nbsp;'
        + '<a href="javascript:void(0)" class="hidebutton" '
        + 'onclick="hr_hideCellRow(this.parentNode);return false;">'
        + 'Hide</a>';
        
    cell.innerHTML += '&nbsp;&nbsp;'
        + '<input type="checkbox" class="hideBox" />';
}

// adds "Hide selected" and "Unhide all" buttons
function hr_addFooterControls(table)
{
    controls = document.createElement("p");
    controls.innerHTML = '<a href="javascript:void(0)" onclick="hr_hideSelectedTableRows(\'' +  table.id + '\');">Hide selected</a>';
    controls.innerHTML += ' - <a href="javascript:void(0)" onclick="hr_unhideAllTableRows(\'' +  table.id + '\');">Unhide all</a>';

    hr_addAfter(controls, table);
}

// generic dom macro. adds $new_node element as sibling after $sibling
function hr_addAfter (new_node, sibling)
{
    sibling.parentNode.insertBefore(new_node, sibling.nextSibling);
}
/*
    /initialisation
*/



/*
    event handlers
*/
function hr_hideSelectedTableRows (table_id)
{
    var table = document.getElementById(table_id);
    
    var checkboxes = table.getElementsByClassName("hideBox");
        
    for (var i = 0; i < checkboxes.length; i++) {
        if (checkboxes[i].checked == true) {
            // checkbox  <- td      <- tr
            checkboxes[i].parentNode.parentNode.style.display = 'none';
        }
    }
}

function hr_unhideAllTableRows (table_id)
{
    var table = document.getElementById(table_id);
    
    var rows = table.getElementsByTagName("tr");
    
    for (var i = 0; i < rows.length; i++) {
        rows[i].style.display = '';
    }
}

function hr_hideCellRow(td) 
{
    // td <- tr
    td.parentNode.style.display = 'none';
}
/*
    /event handlers
*/