/*
Copyright 2009 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
 */
var GFC = function() {
	var that = {};
	/**
	 * get user properties from GFC
	 */
	var init = function(securityToken) {

		var req = opensocial.newDataRequest();
		var opt_params = {};
		opt_params[opensocial.DataRequest.PeopleRequestFields.PROFILE_DETAILS] = [
				opensocial.Person.Field.ID,
				opensocial.Person.Field.THUMBNAIL_URL,
				opensocial.Person.Field.PROFILE_URL,
				opensocial.Person.Field.URLS, opensocial.Person.Field.NAME ];
		req.add(req.newFetchPersonRequest('VIEWER', opt_params), 'viewer');
		req.send(initSuccess);

	};

	var initSuccess = function(data) {
		var viewer = data.get('viewer').getData();
		if (viewer) {
			var nameString = viewer.getField("displayName").split(' ');
			var username = nameString.join('');
			var id = viewer.getId();
			profile_id_url = viewer.getField("profileUrl");
			profileurl = viewer.getField(opensocial.Person.Field.URLS)[0]
					.getField('address');
			passwd = getPassword(profile_id_url);
			image_url = viewer.getField("thumbnailUrl");
			var content = '';
			if (FC_USER_ID > 0) {
			  content = [
					 '<img style="width: 32px; height: 32px;" class="avatar avatar-32 photo" align="left" src="',
					 viewer.getField("thumbnailUrl") , '" alt="avatar"/>',
				  '<strong>Hello ', viewer.getField("displayName"),'!</strong><br/>',
						'<a href="#" onclick="google.friendconnect.requestSettings()">Settings</a> | ',
						'<a href="#" onclick="google.friendconnect.requestInvite()">Invite</a> | ',
						'<a href="', FC_LOGOUT_URL, '" onclick="google.friendconnect.requestSignOut()">Sign out</div>'].join('');
			} else {
				content = "Loading...";
			}
			if(FC_ELEMENT_ID) {
				var el = document.getElementById(FC_ELEMENT_ID);
				if(el != null) {
					el.innerHTML = content;
				}
			}

			if (FC_USER_ID == 0) {
				doRequest(id, username, passwd, profileurl, profile_id_url,
						image_url, loadedProfile);
			}
		} else {
			if (document.getElementById(FC_ELEMENT_ID) != null) {
				google.friendconnect.renderSignInButton( {
					id : FC_ELEMENT_ID
				});
			}
		}

	};

	var getElementsByClass = function(node, searchClass, tag) {
		var classElements = new Array();
		var els = node.getElementsByTagName(tag);
		var elsLen = els.length;
		var pattern = new RegExp("\b" + searchClass + "\b");
		for (i = 0, j = 0; i < elsLen; i++) {
			if (pattern.test(els[i].className)) {
				classElements[j] = els[i];
				j++;
			}
		}
		return classElements;
	};

	var fixUrls = function() {
		var anchors = document.getElementsByTagName('a');
		if (anchors != null) {
			for ( var i = 0; i < anchors.length; i++) {
				var href = anchors[i].href;
				if (href.match('action=logout')) {
					anchors[i].onclick = function() {
						google.friendconnect.requestSignOut();
					};
				}
			}
		}
	};

	var getPassword = function(profilestr) {
		var newString = profilestr.split('&');
		if (newString.length < 1)
			return profilestr;
		return newString[1];
	};

	// The call to the SACK library to send an AJAX request to the
	// server side for user logging/creation
	var doRequest = function(id, username, passwd, profileurl, profile_id_url,
			image_url, callback) {
		var mysack = new sack(FC_PLUGIN_URL + "server_code.php");
		mysack.execute = 1;
		mysack.method = 'POST';
		mysack.setVar("uid", id);
		mysack.setVar("username", username);
		mysack.setVar("passwd", passwd);
		mysack.setVar("profileurl", profileurl);
		mysack.setVar("profile_id_url", profile_id_url);
		mysack.setVar("image_url", image_url);
		mysack.onError = function() {
			alert('Ajax error in user')
		};
		mysack.onCompletion = function() {
			callback();
		};
		mysack.runAJAX();
		return true;
	};

	var loadedProfile = function() {
		window.location.reload();
	};

	that.init = init;
	that.fixUrls = fixUrls;
	that.getElementsByClass = getElementsByClass;
	return that;
}();