public async Task <IActionResult> DownloadUpdates([FromQuery] decimal lat, [FromQuery] decimal lng, [FromQuery] DateTime lastUpdatedTime)
{
if (!ModelState.IsValid)
{
return(Json(new { WasSuccessful = false, Message = "Invalid model state for DownloadUpdates." }));
}
// Download all events where the event was updated after the last client's updated time
GeoBox gb = CalculateBoundingGeoBox(lat, lng, Policy.SURROUNDING_GEOBOX_SIDE_LENGTH);
var @events = await _context.Event.Where(e => (
e.Latitude <gb.MaxLatitude &&
e.Latitude> gb.MinLatitude &&
e.Longitude <gb.MaxLongitude &&
e.Longitude> gb.MinLongitude &&
e.TimeLastUpdated > lastUpdatedTime
)).ToListAsync();
// Determine if any of these events need to be deleted...
var eventsToDelete = @events.Where(Policy.ShouldMarkEventForDeletion);
foreach (Event e in eventsToDelete)
{
e.Deleted = true;
e.TimeLastUpdated = DateTime.UtcNow;
}
_context.UpdateRange(eventsToDelete);
await _context.SaveChangesAsync();
return(Json(new { WasSuccessful = true, Events = @events, CurrentServerTime = DateTime.UtcNow }));
}
