/**
 * @name MapIconMaker
 * @version 1.1
 * @author Pamela Fox
 * @copyright (c) 2008 Pamela Fox
 * @fileoverview This gives you static functions for creating dynamically
 *     sized and colored marker icons using the Charts API marker output.
 */

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */
 
/**
 * This namespace contains functions that you can use to easily create
 *     dynamically sized, colored, and labeled icons.
 * @namespace
 */
var MapIconMaker = {};

/**
 * Creates a flat icon based on the specified options in the 
 *     {@link MarkerIconOptions} argument.
 *     Supported options are: width, height, primaryColor,
 *     shadowColor, label, labelColor, labelSize, and shape..
 * @param {MarkerIconOptions} [opts]
 * @return {GIcon}
 */
MapIconMaker.createFlatIcon = function (opts) {
  var width = opts.width || 32;
  var height = opts.height || 32;
  var primaryColor = opts.primaryColor || "#ff0000";
  var shadowColor = opts.shadowColor || "#000000";
  var label = MapIconMaker.escapeUserText_(opts.label) || "";
  var labelColor = opts.labelColor || "#000000";
  var labelSize = opts.labelSize || 0;
  var shape = opts.shape ||  "circle";
  var shapeCode = (shape === "circle") ? "it" : "itr";

  var baseUrl = "http://chart.apis.google.com/chart?cht=" + shapeCode;
  var iconUrl = baseUrl + "&chs=" + width + "x" + height + 
      "&chco=" + primaryColor.replace("#", "") + "," + 
      shadowColor.replace("#", "") + "ff,ffffff01" +
      "&chl=" + label + "&chx=" + labelColor.replace("#", "") + 
      "," + labelSize;
  var icon = new GIcon(G_DEFAULT_ICON);
  icon.image = iconUrl + "&chf=bg,s,00000000" + "&ext=.png";
  icon.iconSize = new GSize(width, height);
  icon.shadowSize = new GSize(0, 0);
  icon.iconAnchor = new GPoint(width / 2, height / 2);
  icon.infoWindowAnchor = new GPoint(width / 2, height / 2);
  icon.printImage = iconUrl + "&chof=gif";
  icon.mozPrintImage = iconUrl + "&chf=bg,s,ECECD8" + "&chof=gif";
  icon.transparent = iconUrl + "&chf=a,s,ffffff01&ext=.png";
  icon.imageMap = []; 
  if (shapeCode === "itr") {
    icon.imageMap = [0, 0, width, 0, width, height, 0, height];
  } else {
    var polyNumSides = 8;
    var polySideLength = 360 / polyNumSides;
    var polyRadius = Math.min(width, height) / 2;
    for (var a = 0; a < (polyNumSides + 1); a++) {
      var aRad = polySideLength * a * (Math.PI / 180);
      var pixelX = polyRadius + polyRadius * Math.cos(aRad);
      var pixelY = polyRadius + polyRadius * Math.sin(aRad);
      icon.imageMap.push(parseInt(pixelX), parseInt(pixelY));
    }
  }

  return icon;
};




/**
 * Utility function for doing special chart API escaping first,
 *  and then typical URL escaping. Must be applied to user-supplied text.
 * @private
 */
MapIconMaker.escapeUserText_ = function (text) {
  if (text === undefined) {
    return null;
  }
  text = text.replace(/@/, "@@");
  text = text.replace(/\\/, "@\\");
  text = text.replace(/'/, "@'");
  text = text.replace(/\[/, "@[");
  text = text.replace(/\]/, "@]");
  return encodeURIComponent(text);
};