/* $Id: icon.js,v 1.6 2009/02/11 20:14:39 bdragon Exp $ */

/**
 * @file
 * GIcon manager for GMap.
 * Required for markers to operate properly.
 */

/*global $, Drupal, GIcon, GPoint, GSize, G_DEFAULT_ICON */

/**
 * Get the GIcon corresponding to a setname / sequence.
 * There is only one GIcon for each slot in the sequence.
 * The marker set wraps around when reaching the end of the sequence.
 * @@@ TODO: Move this directly into the preparemarker event binding.
 */
Drupal.gmap.getIcon = function (setname, sequence) {
  var othimg = ['printImage', 'mozPrintImage', 'printShadow', 'transparent'];
  // If no setname, return google's default icon.
  if (!setname) {
    return G_DEFAULT_ICON;
  }
  if (!this.gicons) {
    this.gicons = {};
  }

  // If no sequence, synthesise one.
  if (!sequence) {
    // @TODO make this per-map.
    if (!this.sequences) {
      this.sequences = {};
    }
    if (!this.sequences[setname]) {
      this.sequences[setname] = -1;
    }
    this.sequences[setname]++;
    sequence = this.sequences[setname];
  }

  if (!this.gicons[setname]) {
    if (!Drupal.gmap.icons[setname]) {
      alert('Request for invalid marker set ' + setname + '!');
    }
    this.gicons[setname] = [];
    var q = Drupal.gmap.icons[setname];
    var p, t;
    for (var i = 0; i < q.sequence.length; i++) {
      t = new GIcon();
      p = Drupal.gmap.iconpath + q.path;
      t.image = p + q.sequence[i].f;
      if (q.shadow.f !== '') {
        t.shadow = p + q.shadow.f;
        t.shadowSize = new GSize(q.shadow.w, q.shadow.h);
      }
      t.iconSize = new GSize(q.sequence[i].w, q.sequence[i].h);
      t.iconAnchor = new GPoint(q.anchorX, q.anchorY);
      t.infoWindowAnchor = new GPoint(q.infoX, q.infoY);
      for (var j = 0; j < othimg.length; j++) {
        if (q[othimg[j]] !== '') {
          t[othimg[j]] = p + q[othimg[j]];
        }
      }
      // @@@ imageMap?
      this.gicons[setname][i] = t;
    }
    delete Drupal.gmap.icons[setname];
  }
  // TODO: Random, other cycle methods.
  return this.gicons[setname][sequence % this.gicons[setname].length];
};

/**
 * JSON callback to set up the icon defs.
 * When doing the JSON call, the data comes back in a packed format.
 * We need to expand it and file it away in a more useful format.
 */
Drupal.gmap.iconSetup = function () {
  Drupal.gmap.icons = {};
  var m = Drupal.gmap.icondata;
  var filef, filew, fileh, files;
  for (var path in m) {
    if (m.hasOwnProperty(path)) {
      // Reconstitute files array
      filef = m[path].f;
      filew = Drupal.gmap.expandArray(m[path].w, filef.length);
      fileh = Drupal.gmap.expandArray(m[path].h, filef.length);
      files = [];
      for (var i = 0; i < filef.length; i++) {
        files[i] = {f : filef[i], w : filew[i], h : fileh[i]};
      }

      for (var ini in m[path].i) {
        if (m[path].i.hasOwnProperty(ini)) {
          $.extend(Drupal.gmap.icons, Drupal.gmap.expandIconDef(m[path].i[ini], path, files));
        }
      }
    }
  }
};

/**
 * Expand a compressed array.
 * This will pad arr up to len using the last value of the old array.
 */
Drupal.gmap.expandArray = function (arr, len) {
  var d = arr[0];
  for (var i = 0; i < len; i++) {
    if (!arr[i]) {
      arr[i] = d;
    }
    else {
      d = arr[i];
    }
  }
  return arr;
};

/**
 * Expand icon definition.
 * This helper function is the reverse of the packer function found in
 * gmap_markerinfo.inc.
 */
Drupal.gmap.expandIconDef = function (c, path, files) {
  var decomp = ['key', 'name', 'sequence', 'anchorX', 'anchorY', 'infoX',
    'infoY', 'shadow', 'printImage', 'mozPrintImage', 'printShadow',
    'transparent'];
  var fallback = ['', '', [], 0, 0, 0, 0, {f: '', h: 0, w: 0}, '', '', '', ''];
  var imagerep = ['shadow', 'printImage', 'mozPrintImage', 'printShadow',
    'transparent'];
  var defaults = {};
  var sets = [];
  var i, j;
  // Part 1: Defaults / Markersets
  // Expand arrays and fill in missing ones with fallbacks
  for (i = 0; i < decomp.length; i++) {
    if (!c[0][i]) {
      c[0][i] = [ fallback[i] ];
    }
    c[0][i] = Drupal.gmap.expandArray(c[0][i], c[0][0].length);
  }
  for (i = 0; i < c[0][0].length; i++) {
    for (j = 0; j < decomp.length; j++) {
      if (i === 0) {
        defaults[decomp[j]] = c[0][j][i];
      }
      else {
        if (!sets[i - 1]) {
          sets[i - 1] = {};
        }
        sets[i - 1][decomp[j]] = c[0][j][i];
      }
    }
  }
  for (i = 0; i < sets.length; i++) {
    for (j = 0; j < decomp.length; j++) {
      if (sets[i][decomp[j]] === fallback[j]) {
        sets[i][decomp[j]] = defaults[decomp[j]];
      }
    }
  }
  var icons = {};
  for (i = 0; i < sets.length; i++) {
    var key = sets[i].key;
    icons[key] = sets[i];
    icons[key].path = path;
    delete icons[key].key;
    delete sets[i];
    for (j = 0; j < icons[key].sequence.length; j++) {
      icons[key].sequence[j] = files[icons[key].sequence[j]];
    }
    for (j = 0; j < imagerep.length; j++) {
      if (typeof(icons[key][imagerep[j]]) === 'number') {
        icons[key][imagerep[j]] = files[icons[key][imagerep[j]]];
      }
    }
  }
  return icons;
};

/**
 * We attach ourselves if we find a map somewhere needing markers.
 * Note: Since we broadcast our ready event to all maps, it doesn't
 * matter which one we attached to!
 */
Drupal.gmap.addHandler('gmap', function (elem) {
  var obj = this;

  obj.bind('init', function () {
    // Only expand once.
    if (!Drupal.gmap.icons) {
      Drupal.gmap.iconSetup();
    }
  });

  obj.bind('ready', function () {
    // Compatibility event.
    if (Drupal.gmap.icondata) {
      obj.deferChange('iconsready', -1);
    }
  });

  if (!obj.vars.behavior.customicons) {
    // Provide icons to markers.
    obj.bind('preparemarker', function (marker) {
      marker.opts.icon = Drupal.gmap.getIcon(marker.markername, marker.offset);
    });
  }
});
