goog.provide('ol.tilegrid.Zoomify');

goog.require('goog.math');
goog.require('ol.TileCoord');
goog.require('ol.proj');
goog.require('ol.tilecoord');
goog.require('ol.tilegrid.TileGrid');



/**
 * @classdesc
 * Set the grid pattern for sources accessing Zoomify tiled-image servers.
 *
 * @constructor
 * @extends {ol.tilegrid.TileGrid}
 * @param {olx.tilegrid.ZoomifyOptions=} opt_options Options.
 * @api
 */
ol.tilegrid.Zoomify = function(opt_options) {
  var options = goog.isDef(opt_options) ? opt_options : options;

  /**
   * @param {{extent: (ol.Extent|undefined)}=} opt_options Options.
   * @return {function(ol.TileCoord, ol.proj.Projection, ol.TileCoord=):
   *     ol.TileCoord} Tile coordinate transform.
   * @this {ol.tilegrid.Zoomify}
   */
  var createTileCoordTransform = function(opt_options) {
    var options = goog.isDef(opt_options) ? opt_options : {};
    var minZ = this.minZoom;
    var maxZ = this.maxZoom;
    /** @type {Array.<ol.TileRange>} */
    var tileRangeByZ = null;
    if (goog.isDef(options.extent)) {
      tileRangeByZ = new Array(maxZ + 1);
      var z;
      for (z = 0; z <= maxZ; ++z) {
        if (z < minZ) {
          tileRangeByZ[z] = null;
        } else {
          tileRangeByZ[z] = this.getTileRangeForExtentAndZ(options.extent, z);
        }
      }
    }
    return (
        /**
         * @param {ol.TileCoord} tileCoord Tile coordinate.
         * @param {ol.proj.Projection} projection Projection.
         * @param {ol.TileCoord=} opt_tileCoord Destination tile coordinate.
         * @return {ol.TileCoord} Tile coordinate.
         */
        function(tileCoord, projection, opt_tileCoord) {
          var z = tileCoord[0];
          if (z < minZ || maxZ < z) {
            return null;
          }
          var n = Math.pow(2, z);
          var x = tileCoord[1];
          if (x < 0 || n <= x) {
            return null;
          }
          var y = tileCoord[2];
          if (y < -n || -1 < y) {
            return null;
          }
          if (!goog.isNull(tileRangeByZ)) {
            if (!tileRangeByZ[z].containsXY(x, -y - 1)) {
              return null;
            }
          }
          return ol.tilecoord.createOrUpdate(z, x, -y - 1, opt_tileCoord);
        });
  };

  goog.base(this, {
    createTileCoordTransform: createTileCoordTransform,
    origin: [0, 0],
    resolutions: options.resolutions
  });

};
goog.inherits(ol.tilegrid.Zoomify, ol.tilegrid.TileGrid);