/**
 * Sets a global collision callback for the given tile index within the layer. This will affect all
 * tiles on this layer that have the same index. If a callback is already set for the tile index it
 * will be replaced. Set the callback to null to remove it. If you want to set a callback for a tile
 * at a specific location on the map then see setTileLocationCallback.
 *
 * @param {number|array} indexes - Either a single tile index, or an array of tile indexes to have a
 * collision callback set for.
 * @param {function} callback - The callback that will be invoked when the tile is collided with.
 * @param {object} callbackContext - The context under which the callback is called.
 * @param {LayerData} layer - [description]
 */
var SetTileIndexCallback = function (indexes, callback, callbackContext, layer)
{
    if (typeof indexes === 'number')
    {
        layer.callbacks[indexes] = (callback !== null)
            ? { callback: callback, callbackContext: callbackContext }
            : undefined;
    }
    else
    {
        for (var i = 0, len = indexes.length; i < len; i++)
        {
            layer.callbacks[indexes[i]] = (callback !== null)
                ? { callback: callback, callbackContext: callbackContext }
                : undefined;
        }
    }
};

module.exports = SetTileIndexCallback;