/// <summary>
/// Initializes the singleton application object. This is the first line of authored code
/// executed, and as such is the logical equivalent of main() or WinMain().
/// </summary>
public App()
{
this.InitializeComponent();
this.Suspending += OnSuspending;
using (var db = new PicturePlaceDb())
{
db.Database.Migrate();
}
}
/*Deletes everything from the database
*/
private void DeleteFromDB()
{
using (var db = new PicturePlaceDb())
{
foreach (var item in db.data)
{
db.data.Remove(item);
}
db.SaveChanges();
}
}
/*Method stores pics in the local database
*/
private void StorePicture(Datum pic, PicturePlaceDb db)
{
var picInfo = new FbPicInfo
{
city = pic.place.location.city,
country = pic.place.location.country,
latitude = pic.place.location.latitude,
longitude = pic.place.location.longitude,
id = pic.id,
name = pic.place.name,
source = pic.source
};
db.Add(picInfo);
db.SaveChanges();
}
/*Checks to see if there are any new pics in the results returned from facebook, if yes, they are added to the database, otherwise return true "All Pics Added"
*/
private Boolean SortPictures(PicturePlaceObject results, PicturePlaceDb db)
{
Boolean addedAllPics = true;
foreach (var pic in results.data) //loop through all the Pics in results.data
{
if (pic.place != null && pic.place.location != null) //Only add Pics that have a place/location from results
{
var placeId = db.data.Select(id => id.id); //COLLECTION OF ALL THE IDS IN THE DATABASE
//check to see if the collection of ids already contains the new id, if not a new pic is found etc.
if (!placeId.Contains(pic.id))
{
addedAllPics = false;
StorePicture(pic, db);
}
}
}
return(addedAllPics);
}
/*Method takes in the Database object and creates a temporary list which is then looped through and passed into AddPinToMap() to paint the pin to map
*/
private async void PaintPins(PicturePlaceDb db)
{
var tempList = db.data.AsEnumerable().Select(pic => new FbPicInfo
{
longitude = pic.longitude,
latitude = pic.latitude,
source = pic.source,
name = pic.name,
country = pic.country,
city = pic.city
}).ToList();
foreach (var pic in tempList)//loop through all the Pics in tempList
{
AddPinToMap(DesignPin(pic), CreateBasicGeoPosition(pic));
}
if (tempList.Count == 0)
{
var dialog = new MessageDialog("You are not currently not tagged in any facebook pictures with locations.\nPlease Tag youself in a picture on facebook and give it a location and run the app again");
dialog.Title = "No Tagged Photos Found With Locations";
await dialog.ShowAsync();
}
}
/*On Successful login, send GET request to FB endpoint with params and DeserializeJson the results into objects/Dictonary
*/
private async void OnSuccessLogin()
{
string endpoint = "/me/photos";//where the url starts from
PropertySet parameters = new PropertySet();
parameters.Add("fields", "source,place"); //Required fields needed
FBSingleValue value = new FBSingleValue(endpoint, parameters, DeserializeJson.FromJson); //send the request and get back a JSON responce
FBResult graphResult = await value.GetAsync();
if (graphResult.Succeeded)//check to see if the Request Succeeded
{
PicturePlaceObject results = graphResult.Object as PicturePlaceObject;
var db = new PicturePlaceDb();
GetAllFbPic(results, parameters, endpoint, db);
}
else
{
MessageDialog dialog = new MessageDialog("Try Again Later!");
await dialog.ShowAsync();
}
}
/*Method keeps sending get requets to facebook api using paging, untill all pictures have been added
*/
private async void GetAllFbPic(PicturePlaceObject results, PropertySet parameters, string endpoint, PicturePlaceDb db)
{
Boolean addedAllPics = false;
do //only do this while there is a next page and all pics have not been added
{
addedAllPics = SortPictures(results, db); //Add Results to a list
if (addedAllPics == false)
{
parameters.Remove("after"); //Remove previous parameters
parameters.Add("after", results.paging.cursors.after); //the next page to send the request too
FBSingleValue value = new FBSingleValue(endpoint, parameters, DeserializeJson.FromJson); //send the request and get back a JSON responce
FBResult graphResult = await value.GetAsync(); //check to see if the Requets Succeeded
results = graphResult.Object as PicturePlaceObject;
}
} while ((results.paging != null || results.data.Count() != 0) && addedAllPics == false);
PaintPins(db);
}
