goog.provide('ol.TileUrlFunction');
goog.provide('ol.TileUrlFunctionType');

goog.require('goog.asserts');
goog.require('goog.math');
goog.require('ol.TileCoord');
goog.require('ol.tilecoord');


/**
 * {@link ol.source.Tile} sources use a function of this type to get the url
 * that provides a tile for a given tile coordinate.
 *
 * This function takes an {@link ol.TileCoord} for the tile coordinate, a
 * `{number}` representing the pixel ratio and an {@link ol.proj.Projection} for
 * the projection  as arguments and returns a `{string}` representing the tile
 * URL, or undefined if no tile should be requested for the passed tile
 * coordinate.
 *
 * @typedef {function(ol.TileCoord, number,
 *           ol.proj.Projection): (string|undefined)}
 * @api
 */
ol.TileUrlFunctionType;


/**
 * @typedef {function(ol.TileCoord, ol.proj.Projection, ol.TileCoord=):
 *     ol.TileCoord}
 */
ol.TileCoordTransformType;


/**
 * @param {string} template Template.
 * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @return {ol.TileUrlFunctionType} Tile URL function.
 */
ol.TileUrlFunction.createFromTemplate = function(template, tileGrid) {
  var zRegEx = /\{z\}/g;
  var xRegEx = /\{x\}/g;
  var yRegEx = /\{y\}/g;
  var dashYRegEx = /\{-y\}/g;
  return (
      /**
       * @param {ol.TileCoord} tileCoord Tile Coordinate.
       * @param {number} pixelRatio Pixel ratio.
       * @param {ol.proj.Projection} projection Projection.
       * @return {string|undefined} Tile URL.
       */
      function(tileCoord, pixelRatio, projection) {
        if (!tileCoord) {
          return undefined;
        } else {
          return template.replace(zRegEx, tileCoord[0].toString())
              .replace(xRegEx, tileCoord[1].toString())
              .replace(yRegEx, function() {
                var y = -tileCoord[2] - 1;
                return y.toString();
              })
              .replace(dashYRegEx, function() {
                var z = tileCoord[0];
                var range = tileGrid.getFullTileRange(z);
                goog.asserts.assert(range,
                    'The {-y} template requires a tile grid with extent');
                var y = range.getHeight() + tileCoord[2];
                return y.toString();
              });
        }
      });
};


/**
 * @param {Array.<string>} templates Templates.
 * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @return {ol.TileUrlFunctionType} Tile URL function.
 */
ol.TileUrlFunction.createFromTemplates = function(templates, tileGrid) {
  var len = templates.length;
  var tileUrlFunctions = new Array(len);
  for (var i = 0; i < len; ++i) {
    tileUrlFunctions[i] = ol.TileUrlFunction.createFromTemplate(
        templates[i], tileGrid);
  }
  return ol.TileUrlFunction.createFromTileUrlFunctions(tileUrlFunctions);
};


/**
 * @param {Array.<ol.TileUrlFunctionType>} tileUrlFunctions Tile URL Functions.
 * @return {ol.TileUrlFunctionType} Tile URL function.
 */
ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
  goog.asserts.assert(tileUrlFunctions.length > 0,
      'Length of tile url functions should be greater than 0');
  if (tileUrlFunctions.length === 1) {
    return tileUrlFunctions[0];
  }
  return (
      /**
       * @param {ol.TileCoord} tileCoord Tile Coordinate.
       * @param {number} pixelRatio Pixel ratio.
       * @param {ol.proj.Projection} projection Projection.
       * @return {string|undefined} Tile URL.
       */
      function(tileCoord, pixelRatio, projection) {
        if (!tileCoord) {
          return undefined;
        } else {
          var h = ol.tilecoord.hash(tileCoord);
          var index = goog.math.modulo(h, tileUrlFunctions.length);
          return tileUrlFunctions[index](tileCoord, pixelRatio, projection);
        }
      });
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @return {string|undefined} Tile URL.
 */
ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord, pixelRatio, projection) {
  return undefined;
};


/**
 * @param {string} url URL.
 * @return {Array.<string>} Array of urls.
 */
ol.TileUrlFunction.expandUrl = function(url) {
  var urls = [];
  var match = /\{(\d)-(\d)\}/.exec(url) || /\{([a-z])-([a-z])\}/.exec(url);
  if (match) {
    var startCharCode = match[1].charCodeAt(0);
    var stopCharCode = match[2].charCodeAt(0);
    var charCode;
    for (charCode = startCharCode; charCode <= stopCharCode; ++charCode) {
      urls.push(url.replace(match[0], String.fromCharCode(charCode)));
    }
  } else {
    urls.push(url);
  }
  return urls;
};