implement initial JSON generation at tournament start

src/ezgg_lan_manager/services/TournamentService.py

@@ -1,5 +1,9 @@
+import json
+from pprint import pprint
 from typing import Optional
 
+from from_root import from_root
+
 from src.ezgg_lan_manager.services.DatabaseService import DatabaseService
 from src.ezgg_lan_manager.services.UserService import UserService
 from src.ezgg_lan_manager.types.Participant import Participant
@@ -90,6 +94,7 @@ class TournamentService:
         tournament = await self.get_tournament_by_id(tournament_id)
         if tournament:
             tournament.start()
+            await self._generate_initial_json_file(tournament)
             await self._db_service.change_tournament_status(tournament_id, tournament.status)
         self._cache_dirty = True
 
@@ -99,3 +104,37 @@ class TournamentService:
             tournament.cancel()
             await self._db_service.change_tournament_status(tournament_id, tournament.status)
         self._cache_dirty = True
+
+    async def _generate_initial_json_file(self, tournament: Tournament) -> None:
+        """
+        Generates the initial JSON file for the tournament. Won't generate a new one if one already exists.
+        ToDo: Remove this method when final tournament system is completed.
+        """
+        p = tournament.participants
+        pairs = [
+            (p[i], p[i + 1]) if i + 1 < len(p) else (p[i], None)
+            for i in range(0, len(p), 2)
+        ]
+        data = {
+            "rounds": [
+                [
+                    {
+                        "opponent_1_id": pair[0].id if pair[0] is not None else None,
+                        "opponent_2_id": pair[1].id if pair[1] is not None else None,
+                        "winner": None
+                    } for pair in pairs
+                ]
+            ]
+        }
+
+        # Resolve byes
+        for match in data["rounds"][0]:
+            if match["opponent_2_id"] is None:
+                match["winner"] = match["opponent_1_id"]
+
+        file_name = tournament.name.replace(" ", "_") + ".json"
+        try:
+            with open(from_root("tournament_data", file_name), "x") as f:
+                json.dump(data, f, indent=4)
+        except FileExistsError:
+            pass