/**
 * Namespace: Util.OSM
 */
OpenLayers.Util.OSM = {};

/**
 * Constant: MISSING_TILE_URL
 * {String} URL of image to display for missing tiles
 */
OpenLayers.Util.OSM.MISSING_TILE_URL =
  "http://openstreetmap.org/openlayers/img/404.png";

/**
 * Property: originalOnImageLoadError
 * {Function} Original onImageLoadError function.
 */
OpenLayers.Util.OSM.originalOnImageLoadError =
  OpenLayers.Util.onImageLoadError;

/**
 * Function: onImageLoadError
 */
OpenLayers.Util.onImageLoadError = function() {
  if (this.src.match(/^http:\/\/[abc]\.[a-z]+\.openstreetmap\.org\//)) {
    this.src = OpenLayers.Util.OSM.MISSING_TILE_URL;
  } else if (this.src.match(/^http:\/\/[def]\.tah\.openstreetmap\.org\//)) {
    // do nothing - this layer is transparent
  } else {
    OpenLayers.Util.OSM.originalOnImageLoadError;
  }
};

/**
 * Class: OpenLayers.Layer.OSM.Mapnik
 *
 * Inherits from:
 *  - <OpenLayers.Layer.OSM>
 */
OpenLayers.Layer.OSM.Mapnik = OpenLayers.Class(OpenLayers.Layer.OSM, {
  /**
   * Constructor: OpenLayers.Layer.OSM.Mapnik
   *
   * Parameters:
   * name - {String}
   * options - {Object} Hashtable of extra options to tag onto the layer
   */
  initialize: function(name, options) {
    var url = [
      "http://a.tile.openstreetmap.org/${z}/${x}/${y}.png",
      "http://b.tile.openstreetmap.org/${z}/${x}/${y}.png",
      "http://c.tile.openstreetmap.org/${z}/${x}/${y}.png"
    ];
    options = OpenLayers.Util.extend({ numZoomLevels: 19 }, options);
    var newArguments = [name, url, options];
    OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
  },
  CLASS_NAME: "OpenLayers.Layer.OSM.Mapnik"
});

/**
 * Class: OpenLayers.Layer.OSM.Osmarender
 *
 * Inherits from:
 *  - <OpenLayers.Layer.OSM>
 */
OpenLayers.Layer.OSM.Osmarender = OpenLayers.Class(OpenLayers.Layer.OSM, {
  /**
   * Constructor: OpenLayers.Layer.OSM.Osmarender
   *
   * Parameters:
   * name - {String}
   * options - {Object} Hashtable of extra options to tag onto the layer
   */
  initialize: function(name, options) {
    var url = [
      "http://a.tah.openstreetmap.org/Tiles/tile/${z}/${x}/${y}.png",
      "http://b.tah.openstreetmap.org/Tiles/tile/${z}/${x}/${y}.png",
      "http://c.tah.openstreetmap.org/Tiles/tile/${z}/${x}/${y}.png"
    ];
    options = OpenLayers.Util.extend({ numZoomLevels: 18 }, options);
    var newArguments = [name, url, options];
    OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
  },
  CLASS_NAME: "OpenLayers.Layer.OSM.Osmarender"
});

/**
 * Class: OpenLayers.Layer.OSM.CycleMap
 *
 * Inherits from:
 *  - <OpenLayers.Layer.OSM>
 */
OpenLayers.Layer.OSM.CycleMap = OpenLayers.Class(OpenLayers.Layer.OSM, {
  /**
   * Constructor: OpenLayers.Layer.OSM.CycleMap
   *
   * Parameters:
   * name - {String}
   * options - {Object} Hashtable of extra options to tag onto the layer
   */
  initialize: function(name, options) {
    var url = [
      "http://a.andy.sandbox.cloudmade.com/tiles/cycle/${z}/${x}/${y}.png",
      "http://b.andy.sandbox.cloudmade.com/tiles/cycle/${z}/${x}/${y}.png",
      "http://c.andy.sandbox.cloudmade.com/tiles/cycle/${z}/${x}/${y}.png"
    ];
  options = OpenLayers.Util.extend({ numZoomLevels: 19 }, options);
  var newArguments = [name, url, options];
    OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
  },
  CLASS_NAME: "OpenLayers.Layer.OSM.CycleMap"
});

/**
 * Class: OpenLayers.Layer.OSM.Maplint
 *
 * Inherits from:
 *  - <OpenLayers.Layer.OSM>
 */
OpenLayers.Layer.OSM.Maplint = OpenLayers.Class(OpenLayers.Layer.OSM, {
  /**
   * Constructor: OpenLayers.Layer.OSM.Maplint
   *
   * Parameters:
   * name - {String}
   * options - {Object} Hashtable of extra options to tag onto the layer
   */
  initialize: function(name, options) {
    var url = [
      "http://d.tah.openstreetmap.org/Tiles/maplint/${z}/${x}/${y}.png",
      "http://e.tah.openstreetmap.org/Tiles/maplint/${z}/${x}/${y}.png",
      "http://f.tah.openstreetmap.org/Tiles/maplint/${z}/${x}/${y}.png"
    ];
    options = OpenLayers.Util.extend({ numZoomLevels: 18, isBaseLayer: false, visibility: false }, options);
    var newArguments = [name, url, options];
    OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
  },
  CLASS_NAME: "OpenLayers.Layer.OSM.Maplint"
});