fix unique participant in war & campaign

src/warchron/model/campaign.py

@@ -54,11 +54,16 @@ class Campaign:
     def has_participant(self, participant_id: str) -> bool:
         return participant_id in self.participants
 
+    def has_war_participant(self, war_participant_id: str) -> bool:
+        return any(
+            part.war_participant_id == war_participant_id
+            for part in self.participants.values()
+        )
+
     def add_campaign_participant(
         self, war_participant_id: str, leader: str, theme: str
     ) -> CampaignParticipant:
-        ## TODO change lookup id target
-        if war_participant_id in self.participants:
+        if self.has_war_participant(war_participant_id):
             raise ValueError("Player already registered in this campaign")
         participant = CampaignParticipant(
             war_participant_id=war_participant_id, leader=leader, theme=theme

src/warchron/model/model.py

@@ -123,7 +123,6 @@ class Model:
                     return war
         raise KeyError(f"Objective {objective_id} not found in any War")
 
-    # TODO don't use this method as participant with same ID (player) can be in several wars!
     def get_war_by_war_participant(self, participant_id: str) -> War:
         for war in self.wars.values():
             if war.has_participant(participant_id):
@@ -174,9 +173,7 @@ class Model:
     def get_available_players(self, war_id: str) -> list[Player]:
         war = self.get_war(war_id)
         return [
-            player
-            for player in self.players.values()
-            if not war.has_participant(player.id)
+            player for player in self.players.values() if not war.has_player(player.id)
         ]
 
     def add_war_participant(

src/warchron/model/war.py

@@ -81,11 +81,14 @@ class War:
     def get_all_war_participants_ids(self) -> set[str]:
         return set(self.participants.keys())
 
-    def has_participant(self, player_id: str) -> bool:
-        return player_id in self.participants
+    def has_participant(self, participant_id: str) -> bool:
+        return participant_id in self.participants
+
+    def has_player(self, player_id: str) -> bool:
+        return any(part.player_id == player_id for part in self.participants.values())
 
     def add_war_participant(self, player_id: str, faction: str) -> WarParticipant:
-        if player_id in self.participants:
+        if self.has_player(player_id):
             raise ValueError("Player already registered in this war")
         participant = WarParticipant(player_id=player_id, faction=faction)
         self.participants[participant.id] = participant
@@ -207,7 +210,7 @@ class War:
         return [
             part
             for part in self.participants.values()
-            if not camp.has_participant(part.id)
+            if not camp.has_war_participant(part.id)
         ]
 
     def add_campaign_participant(