// constants

var GB_METER_WIDTH = 4.93;

var GB_METER_HEIGHT = 15;

var GB_FEET_WIDTH = 1.5;

var GB_FEET_HEIGHT = 4.57;







/*

 * Square Coverage.

 */

function areaToTiles(width, length) {

  if(width <= 0 || length <= 0) {

    alert("Please enter the area dimensions.");

    return;

  }



  if(isNaN(width) || isNaN(length)) {

    alert("Invalid input. Please try again.");

    return;

  }

  

  // actual area desired

  var actArea = Math.round(width * length * 100) / 100; // round to hundredths

  var units = document.areaForm.units.value;

  var rnd = document.areaForm.rnd.value; // round up or down

  //var type = document.areaForm.type.value; // tile type

  var type = "GB";

  document.areaForm.actArea.value = "Desired Coverage: " + actArea + " sq. " + units;

  var numTilesWidth = null; // number of tiles across the width

  var numTilesLength = null; // number of tiles along the length

  var area = null; // area the tiles will cover



  if (units == "meters") {

    if (type == "GB") {

      if (rnd == "up") {

        numTilesWidth = Math.ceil(width * GB_METER_WIDTH);

        numTilesLength = Math.ceil(length * GB_METER_HEIGHT);

      } else { // round down

        numTilesWidth = Math.floor(width * GB_METER_WIDTH);

        numTilesLength = Math.floor(length * GB_METER_HEIGHT);

      }

    } else { // tile type is gridmat

      // !!!

    }

    // special case round flooring to zero

    if (numTilesWidth == 0) numTilesWidth++;

    if (numTilesLength == 0) numTilesLength++;

    area = Math.round(((numTilesWidth * numTilesLength * 2.625 * 8) / 1550) * 100) / 100; // round to hundredths

  } else { // units are feet

    if (type == "GB") {

      if (rnd == "up") {

        numTilesWidth = Math.ceil(width * GB_FEET_WIDTH);

        numTilesLength = Math.ceil(length * GB_FEET_HEIGHT);

      } else { // round down

        numTilesWidth = Math.floor(width * GB_FEET_WIDTH);

        numTilesLength = Math.floor(length * GB_FEET_HEIGHT);

      }

    } else { // tile type is gridmat

      // !!!

    }

    // special case round flooring to zero

    if (numTilesWidth == 0) numTilesWidth++;

    if (numTilesLength == 0) numTilesLength++;

    area = Math.round(((numTilesWidth * numTilesLength * 2.625 * 8) / 144) * 100) / 100; // round to hundredths

	

  }

  var numTiles = numTilesWidth * numTilesLength;

  document.areaForm.area.value = "Actual Coverage: " + area + " sq. " + units;

  document.areaForm.tiles.value = "Pieces: " + numTiles + " Brick (" + numTilesWidth + " Across, " + numTilesLength + " High)";

  document.areaForm.boxes.value = "Boxes: " + Math.ceil((numTiles / 63) * 1) / 1 + " Boxes @ 63 Pieces/Box ";

}



var CORNER_METER_WIDTH = 2.625;

var CORNER_FEET_WIDTH = 2.625;



/*

 * Converts area to tiles.

 */

function LengthToTiles(width, length) {

  if(width <= 0) {

    alert("Please enter the area dimensions.");

    return;

  }



  if(isNaN(width)) {

    alert("Invalid input. Please try again.");

    return;

  }

  

  // actual area desired

  var actArea = Math.round(width * 100) / 100; // round to hundredths

  var units = document.lengthForm.units.value;

  var rnd = document.lengthForm.rnd.value; // round up or down

  //var type = document.lengthForm.type.value; // tile type

  var type = "brick";

  document.lengthForm.actArea.value = "Desired Length: " + actArea + " ln. " + units;

  var numTilesWidth = null; // number of tiles across the width



  var area = null; // area the tiles will cover



  if (units == "meters") {

    if (type == "brick") {

      if (rnd == "up") {

        numTilesWidth = Math.ceil((width * 39.36) / CORNER_METER_WIDTH);



      } else { // round down

        numTilesWidth = Math.floor((width * 39.36) / CORNER_METER_WIDTH);



      }

    } else { // tile type is gridmat

      // !!!

    }

    // special case round flooring to zero

    if (numTilesWidth == 0) numTilesWidth++;



    area = Math.round(((numTilesWidth * CORNER_FEET_WIDTH) / 39.36) * 100) / 100; // round to hundredths

  } else { // units are feet

    if (type == "brick") {

      if (rnd == "up") {

        numTilesWidth = Math.ceil((width * 12) / CORNER_FEET_WIDTH);



      } else { // round down

        numTilesWidth = Math.floor((width * 12) / CORNER_FEET_WIDTH);



      }

    } else { // tile type is gridmat

      // !!!

    }

    // special case round flooring to zero

    if (numTilesWidth == 0) numTilesWidth++;



    area = Math.round(((numTilesWidth * CORNER_FEET_WIDTH) / 12) * 100) / 100; // round to hundredths

  }

  var numTiles = numTilesWidth;

  document.lengthForm.area.value = "Actual Length: " + area + " ln. " + units;

  document.lengthForm.tiles.value = "Pieces: " + numTiles + " Brick Corners ";

  document.lengthForm.boxes.value = "Boxes: " + Math.ceil((numTiles / 32) * 1) / 1 + " Boxes @ 32 Pieces/Box ";

}