Prevent duplicate stations and seeds (#320)

Sources/Controllers/StationController.m

@@ -233,6 +233,14 @@ - (void) seedAdded:(NSNotification*) not {
   if (seedsOfKind == nil) {
     seedsOfKind = seeds[seedKind] = [NSMutableArray array];
   }
+  NSString *seedId = seed[@"seedId"];
+  for (NSDictionary *currSeed in seedsOfKind) {
+    NSString *currSeedId = [currSeed objectForKey:@"seedId"];
+    if ([currSeedId isEqualToString:seedId]) {
+      return;
+    }
+  }
+
   [seedsOfKind addObject:seed];
   seeds[seedKind] = seedsOfKind;
   [seedsCurrent reloadData];

Sources/Pandora/Pandora.m

@@ -13,6 +13,8 @@
 #import "URLConnection.h"
 #import "Notifications.h"
 #import "PandoraDevice.h"
+#import "StationsController.h"
+#import "PlaybackController.h"
 
 #pragma mark Error Codes
 
@@ -338,6 +340,7 @@ - (BOOL) isAuthenticated {
 #pragma mark - Station Manipulation
 
 - (BOOL) createStation: (NSString*)musicId {
+
   NSMutableDictionary *d = [self defaultRequestDictionary];
   d[@"musicToken"] = musicId;
 
@@ -348,6 +351,18 @@ - (BOOL) createStation: (NSString*)musicId {
     NSDictionary *result = d[@"result"];
     Station *s = [self parseStationFromDictionary:result];
     NSMutableDictionary *dict = [NSMutableDictionary dictionary];
+    // Check if station exists:
+    NSUInteger stationIndex = [stations indexOfObject:s];
+
+    if (stationIndex <= [stations count]) {
+      // Station already exists, play it
+      Station *existingStation = [stations objectAtIndex:stationIndex];
+      // This is misleading but it closes the search box
+      dict[@"station"] = existingStation;
+      [self postNotification:PandoraDidCreateStationNotification result:dict];
+      return;
+    }
+
     dict[@"station"] = s;
     [stations addObject:s];
     [Station addStation:s];
@@ -614,7 +629,9 @@ - (BOOL) addSeed: (NSString*)token toStation:(Station*)station {
   [req setRequest:d];
   [req setTls:FALSE];
   [req setCallback:^(NSDictionary* d) {
-    [self postNotification:PandoraDidAddSeedNotification result:d[@"result"]];
+    NSDictionary *result = d[@"result"];
+
+    [self postNotification:PandoraDidAddSeedNotification result:result];
   }];
   return [self sendAuthenticatedRequest:req];
 }