94 lines
3.6 KiB
Python
94 lines
3.6 KiB
Python
from .models import Tournament, Match
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class SwissSystemService:
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"""
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Zentrales Service für Turnierberechnungen im Schweizer System.
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Verantwortlich für Ranglisten, Wertung und Paarungen.
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"""
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@staticmethod
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def get_standings(tournament_id):
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"""
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Berechnet die aktuelle Rangliste eines Turniers.
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Kriterien (in Reihenfolge):
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1. Anzahl gewonnener Punkte (Win=1, Draw=0.5)
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2. Buchholz-Wertung (Summe der Punktzahlen der Gegner)
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"""
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try:
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tournament = Tournament.objects.get(id=tournament_id)
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except Tournament.DoesNotExist:
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return []
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# Alle Spieler in diesem Turnier abrufen
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players_dict = {}
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# 1. Basis-Daten für alle Spieler initialisieren
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for reg in tournament.registrations.all():
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players_dict[reg.player.id] = {
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'id': reg.player.id,
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'name': f"{reg.player.first_name} {reg.player.last_name}",
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'club': reg.player.club,
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'points': 0.0,
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'matches_played': 0,
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'opponents_points': [] # Um Buchholz zu berechnen
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}
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# 2. Alle abgeschlossenen Spiele durchgehen und Punkte zuteilen
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completed_matches = Match.objects.filter(
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round_detail__tournament=tournament,
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result__in=[Match.ResultStatus.WHITE_WIN, Match.ResultStatus.BLACK_WIN, Match.ResultStatus.DRAW]
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)
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for match in completed_matches:
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if match.result == Match.ResultStatus.DRAW:
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p_white = players_dict.get(match.player_white.id)
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p_black = players_dict.get(match.player_black.id)
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# Punkte addieren (0.5 für Unentschieden)
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if p_white:
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p_white['points'] += 0.5
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p_white['matches_played'] += 1
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if p_black:
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p_black['points'] += 0.5
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p_black['matches_played'] += 1
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elif match.result == Match.ResultStatus.WHITE_WIN:
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p_white = players_dict.get(match.player_white.id)
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if p_white:
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p_white['points'] += 1.0
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p_white['matches_played'] += 1
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elif match.result == Match.ResultStatus.BLACK_WIN:
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p_black = players_dict.get(match.player_black.id)
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if p_black:
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p_black['points'] += 1.0
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p_black['matches_played'] += 1
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# Buchholz-Hilfe: Merken, gegen wen gespielt wurde (ID des Gegners)
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if match.player_white.id in players_dict:
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players_dict[match.player_white.id]['opponents_points'].append(match.player_black.id)
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if match.player_black.id in players_dict:
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players_dict[match.player_black.id]['opponents_points'].append(match.player_white.id)
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# 3. Buchholz-Score berechnen
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# (Summe der aktuellen Punkte aller Gegner)
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for pid, data in players_dict.items():
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buchholz = 0.0
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for opp_id in data['opponents_points']:
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if opp_id in players_dict:
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buchholz += players_dict[opp_id]['points']
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# Buchholz zum Datensatz hinzufügen (zum Anzeigen und Sortieren)
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data['buchholz'] = round(buchholz, 2)
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# 4. In eine Liste verwandeln und sortieren
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standings_list = list(players_dict.values())
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# Sortierung:
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# Primär: Punkte (absteigend), Sekundär: Buchholz (absteigend)
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standings_list.sort(key=lambda x: (x['points'], x['buchholz']), reverse=True)
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return standings_list
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