/**
* 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"
});