// Copyright 2007, Google Inc.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//  2. Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//  3. Neither the name of Google Inc. nor the names of its contributors may be
//     used to endorse or promote products derived from this software without
//     specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Sets up google.gears.*, which is *the only* supported way to access Gears.
//
// Circumvent this file at your own risk!
//
// In the future, Gears may automatically define google.gears.* without this
// file. Gears may use these objects to transparently fix bugs and compatibility
// issues. Applications that use the code below will continue to work seamlessly
// when that happens.

(function() {
  // We are already defined. Hooray!
  if (window.google && google.gears) {
    return;
  }

  var factory = null;

  // Firefox
  if (typeof GearsFactory != 'undefined') {
    factory = new GearsFactory();
  } else {
    // IE
    try {
      factory = new ActiveXObject('Gears.Factory');
      // privateSetGlobalObject is only required and supported on IE Mobile on
      // WinCE.
      if (factory.getBuildInfo().indexOf('ie_mobile') != -1) {
        factory.privateSetGlobalObject(this);
      }
    } catch (e) {
      // Safari
      if ((typeof navigator.mimeTypes != 'undefined')
           && navigator.mimeTypes["application/x-googlegears"]) {
        factory = document.createElement("object");
        factory.style.display = "none";
        factory.width = 0;
        factory.height = 0;
        factory.type = "application/x-googlegears";
        document.documentElement.appendChild(factory);
      }
    }
  }

  // *Do not* define any objects if Gears is not installed. This mimics the
  // behavior of Gears defining the objects in the future.
  if (!factory) {
    return;
  }

  // Now set up the objects, being careful not to overwrite anything.
  //
  // Note: In Internet Explorer for Windows Mobile, you can't add properties to
  // the window object. However, global objects are automatically added as
  // properties of the window object in all browsers.
  if (!window.google) {
    google = {};
  }

  if (!google.gears) {
    google.gears = {factory: factory};
  }
})();

var GGCOOKIE_NAME = "wiki_db_GGears";
// Change this to set the name of the managed resource store to create.
// You use the name with the createManagedStore, and removeManagedStore,
// and openManagedStore APIs. It isn't visible to the user.
var STORE_NAME = "wikixpert";
 
var MANIFEST_FILENAME = "http://wiki.starxpert.fr/wiki/Accueil/index.php?action=ggears_manifest";
var HELPME_FILENAME = "http://wiki.starxpert.fr/wiki/Accueil/index.php?action=ggears_helpme";
// In case we are offline with a disabled store, that's the relative part
// of the URL to type to activate the local store
var HELPME_URL = "offline";
 
var localServer;
var store;
var store2;
var blink=false;
 
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}
 
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}
 
function eraseCookie(name) {
	createCookie(name,"",-1);
}
 
function allowedCookie() {
   createCookie(GGCOOKIE_NAME+'test', 'test');
   if (readCookie(GGCOOKIE_NAME+'test')) {
      eraseCookie(GGCOOKIE_NAME+'test');
      return true;
   }
   return false;
}
 
// Called onload to initialize local server and store variables
function initStore() {
  if (!window.google || !google.gears) {
    //    textOut("Google Gears not found");
      return;
  }
  //Lets see if the user already authorized GGears
  if (readCookie(GGCOOKIE_NAME)) {
    localServer = google.gears.factory.create("beta.localserver");
    store = localServer.openManagedStore(STORE_NAME);
    // if (store) {Here is the place to touch the manifestUrl, if required}
    menuStore();
    // add the version if it's the offline page
    var elm = document.getElementById("t-offStore");
    if (elm.firstChild) {
      elm.appendChild(document.createTextNode('v: '+store.currentVersion));
    }
  } else {
    menuStore();
  }
}
 
// Functions to create an offline helper in case
// we are stuck offline with a disabled store
// As it's optional we won't throw any error
function createHelpmeStoreCallback(url, success, id) {
  store2.rename(HELPME_FILENAME, HELPME_URL);
}
function createHelpmeStore() {
  if (!window.google || !google.gears || !localServer) {
    return;
  }
  store2 = localServer.createStore(STORE_NAME);
  if (!store2) {
    return;
  }
  store2.capture(HELPME_FILENAME, createHelpmeStoreCallback);
}
function removeHelpmeStore() {
  if (!window.google || !google.gears || !localServer) {
    return;
  }
  localServer.removeStore(STORE_NAME);
}
 
// Create (or open&update) the managed resource store
function createStore() {
  if (!window.google || !google.gears) {
    alert("You must install Google Gears first.");
    return;
  }
  if (!allowedCookie()) {
    alert("You must allow cookies!\nAborting...");
    return;
  } else {
    createCookie(GGCOOKIE_NAME, 1, 365*10);
  }
  if (!localServer) {
    localServer = google.gears.factory.create("beta.localserver");
  }
  store = localServer.createManagedStore(STORE_NAME);
  if (!store) {
    textOut("Error creating store");
  } else {
    store.manifestUrl = MANIFEST_FILENAME;
    hideItem("t-createStore");
    showItem("t-removeStore");
    // To not switch to offline mode by default:
    //store.enabled = false;
    updateStore();
  }
}
 
// Update the managed resource store
function updateStore() {
  if (!window.google || !google.gears) {
    alert("You must install Google Gears first.");
    return;
  }
  textOut("Downloading...");
  // Let's also create/refresh our helper page
  createHelpmeStore();
  store.checkForUpdate();
  var timerId = window.setInterval(function() {
    // if store was removed during sync:
    if (!store) {
      window.clearInterval(timerId);
    } else if (store.updateStatus == 0) {
      window.clearInterval(timerId);
      textOut("Sync done!\n" +
              "Version: " +
              store.currentVersion);
      menuStore();
      setTimeout('textOut("")', 2000);
    } else if (store.updateStatus == 3) {
      window.clearInterval(timerId);
      textOut("Error: " + store.lastErrorMessage);
    } else {
      textBlink();
    }
  }, 500);
}
 
// Remove the managed resource store.
function removeStore() {
  if (!window.google || !google.gears || !store) {
    return;
  }
  var enabled = store.enabled;
  localServer.removeManagedStore(STORE_NAME);
  eraseCookie(GGCOOKIE_NAME);
  removeHelpmeStore();
  // Were we working offline?
  if (enabled) {
    hideItem("t-createStore");
    hideItem("t-updateStore");
    hideItem("t-removeStore");
    hideItem("t-enableStore");
    hideItem("t-disableStore");
    textOut("Store removed\n" +
            "Going online...");
    setTimeout("location.reload(true)", 2000);
  } else {
    store = null;
    menuStore();
    textOut("Store removed");
    setTimeout('textOut("");', 2000);
  }
}
 
function enableStore() {
  if (!window.google || !google.gears || !store) {
    return;
  }
  store.enabled = true;
  menuStore();
  setTimeout("location.reload(true)", 5);
}
 
function disableStore() {
  if (!window.google || !google.gears || !store) {
    return;
  }
  store.enabled = false;
  menuStore();
  setTimeout("location.reload(true)", 5);
}
 
// Utility function to output some status text.
function textOut(s) {
 var elm = document.getElementById("t-textStore");
  while (elm.firstChild) {
    elm.removeChild(elm.firstChild);
  }
  elm.appendChild(document.createTextNode(s));
  elm.style.fontWeight='normal';
  blink=false;
}
 
function textBlink() {
 var elm = document.getElementById("t-textStore");
  if (blink) {
    elm.style.fontWeight='normal';
    blink=false;
  } else {
    elm.style.fontWeight='bold';
    blink=true;
  }
}
 
// update the menu entries according to the current state
function menuStore() {
  var elm = document.getElementById("p-ggears");
  if (elm) {
    elm.style.visibility='visible';
  }
  if (!readCookie(GGCOOKIE_NAME) || !store) {
    showItem("t-createStore");
    hideItem("t-updateStore");
    hideItem("t-removeStore");
    hideItem("t-enableStore");
    hideItem("t-disableStore");
  } else {
    hideItem("t-createStore");
    showItem("t-updateStore");
    showItem("t-removeStore");
    if (store.enabled) {
      hideItem("t-enableStore");
      showItem("t-disableStore");
    } else {
      hideItem("t-disableStore");
      showItem("t-enableStore");
    }
  }
}
 
function showItem(s) {
  var elm = document.getElementById(s);
  if (elm) {
    elm.style.display='list-item';
  }
}
 
function hideItem(s) {
  var elm = document.getElementById(s);
  if (elm) {
    elm.style.display='none';
  }
}