public async Task<IHttpActionResult> InsertWaypoints(int id, Waypoint newWp)
{
//Use a transaction because we have to make possibly 2 commits to the database. If
//either fails, we need to roll back
using (var trans = db.Database.BeginTransaction())
{
try
{
Mission mission = await db.Missions.FindAsync(id);
//If the mission doesn't exist, or the input parameter doesn't match the stored mission id, then return bad request
//The auto-generated WebApi2
if (mission == null && newWp.MissionId != id)
{
return BadRequest("The Mission was not found and the waypoint was null");
}
newWp = db.Waypoints.Add(newWp);
await db.SaveChangesAsync();
var wps = mission.Waypoints;
//Try to get the nextWaypoint id
var nextPointId = newWp.NextWaypointId;
//If nextPointId is not null, fix the reference of the former previous waypoint
if (nextPointId != null)
{
//Find previous waypoint
Waypoint prevWp = (from wp in mission.Waypoints
//Make sure we don't accidentally get the wp we just inserted
where wp.NextWaypointId == nextPointId && wp.Id != newWp.Id && wp.IsActive
select wp).FirstOrDefault();
if (prevWp != null) //If this new WP is not at the beginning of the list
{
prevWp.NextWaypointId = newWp.Id;
//This waypoint is now modified. Let the context know.
db.Entry(prevWp).State = System.Data.Entity.EntityState.Modified;
await db.SaveChangesAsync();
}
}
//We finished with the transactions, make sure to commit them.
trans.Commit();
var hub = GlobalHost.ConnectionManager.GetHubContext<VehicleHub>();
hub.Clients.All.WaypointInserted(id);
return Ok(newWp);
}
catch (DbUpdateException e)
{
//Something went wrong. Rollback any changes, if any.
trans.Rollback();
return BadRequest();
}
}
}
public async Task<IHttpActionResult> Put(int id, Waypoint wp)
{
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
if (id != wp.Id)
{
return BadRequest();
}
db.Entry(wp).State = System.Data.Entity.EntityState.Modified;
try
{
await db.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
bool exists = WaypointExists(id);
if (!exists)
{
return NotFound();
}
else
{
throw;
}
}
var hub = GlobalHost.ConnectionManager.GetHubContext<VehicleHub>();
hub.Clients.All.WaypointUpdate(wp);
return StatusCode(HttpStatusCode.NoContent);
}
public async Task<IHttpActionResult> AppendWaypoints(int id, Waypoint[] wps)
{
if (wps.Count() == 0)
{
return Ok(wps);
}
using (var trans = db.Database.BeginTransaction())
{
var wp = await getLastWaypoint(id);
await this.addWaypointsToMission(id, wps);
wp.NextWaypointId = wps[0].Id;
db.Entry(wp).State = System.Data.Entity.EntityState.Modified;
await db.SaveChangesAsync();
var hub = GlobalHost.ConnectionManager.GetHubContext<VehicleHub>();
hub.Clients.All.newRouteForMission(id);
return Ok(wps);
}
}
private async Task addWaypointsToMission(int missionId, Waypoint[] wps)
{
var wpLast = wps.Last();
wpLast.MissionId = missionId;
wpLast = db.Waypoints.Add(wpLast);
wpLast.IsActive = true;
await db.SaveChangesAsync();
for (int i = wps.Count() - 2; i >= 0; i--)
{
var curWp = wps.ElementAt(i);
curWp.NextWaypointId = wpLast.Id;
curWp.MissionId = missionId;
curWp.IsActive = true;
wpLast = db.Waypoints.Add(curWp);
await db.SaveChangesAsync();
}
}
public async Task<IHttpActionResult> NewRouteForMission(int id, Waypoint[] wps)
{
using (var trans = db.Database.BeginTransaction())
{
Mission mission = await db.Missions.FindAsync(id);
if (mission == null)
{
return NotFound();
}
if (wps == null || wps.Count() < 1)
{
return BadRequest();
}
foreach (var wp in mission.Waypoints)
{
wp.IsActive = false;
db.Entry(wp).State = System.Data.Entity.EntityState.Modified;
}
await db.SaveChangesAsync();
await this.addWaypointsToMission(id, wps);
trans.Commit();
var hub = GlobalHost.ConnectionManager.GetHubContext<VehicleHub>();
hub.Clients.All.newRouteForMission(mission.id);
return Ok(wps);
}
}
