refactor(gameplay): extract start/show transitions from lobby views

fupogfakta/services.py

@@ -1,18 +1,23 @@
 import random
+from datetime import timedelta
 from dataclasses import dataclass
 from typing import Any
 
 from django.db import transaction
 from django.utils import timezone
 
-from .models import GameSession, Guess, LieAnswer, Player, Question, RoundConfig, RoundQuestion, ScoreEvent
+from .models import Category, GameSession, Guess, LieAnswer, Player, Question, RoundConfig, RoundQuestion, ScoreEvent
 from .payloads import (
     build_finish_game_phase_event,
     build_finish_game_response,
+    build_lie_started_payload,
+    build_question_shown_payload,
+    build_question_shown_response,
     build_reveal_scoreboard_response,
     build_scoreboard_phase_event,
     build_start_next_round_phase_event,
     build_start_next_round_response,
+    build_start_round_response,
 )
 
 
@@ -121,6 +126,81 @@ def prepare_mixed_answers(round_question: RoundQuestion) -> list[str]:
 
 
 
+
+
+def start_round(session: GameSession, category_slug: str) -> RoundTransitionResult:
+    try:
+        category = Category.objects.get(slug=category_slug, is_active=True)
+    except Category.DoesNotExist:
+        raise ValueError("category_not_found")
+
+    if not Question.objects.filter(category=category, is_active=True).exists():
+        raise ValueError("category_has_no_questions")
+
+    with transaction.atomic():
+        locked_session = GameSession.objects.select_for_update().get(pk=session.pk)
+        if locked_session.status != GameSession.Status.LOBBY:
+            raise ValueError("round_start_invalid_phase")
+
+        if RoundConfig.objects.filter(session=locked_session, number=locked_session.current_round).exists():
+            raise ValueError("round_already_configured")
+
+        round_config = RoundConfig(
+            session=locked_session,
+            number=locked_session.current_round,
+            category=category,
+        )
+
+        round_question = select_round_question(locked_session, round_config)
+
+        round_config.save()
+        locked_session.status = GameSession.Status.LIE
+        locked_session.save(update_fields=["status"])
+
+    phase_event = {
+        "name": "phase.lie_started",
+        "payload": build_lie_started_payload(locked_session, round_config, round_question),
+    }
+    return RoundTransitionResult(
+        session=locked_session,
+        round_config=round_config,
+        round_question=round_question,
+        should_broadcast=True,
+        response_payload=build_start_round_response(locked_session, round_config, round_question),
+        phase_event_name=phase_event["name"],
+        phase_event_payload=phase_event["payload"],
+    )
+
+
+def show_question(session: GameSession) -> RoundTransitionResult:
+    if session.status != GameSession.Status.LIE:
+        raise ValueError("show_question_invalid_phase")
+
+    try:
+        round_config = RoundConfig.objects.get(session=session, number=session.current_round)
+    except RoundConfig.DoesNotExist:
+        raise ValueError("round_config_missing")
+
+    round_question = get_current_round_question(session)
+    if round_question is None:
+        round_question = select_round_question(session, round_config)
+
+    lie_deadline_at = round_question.shown_at + timedelta(seconds=round_config.lie_seconds)
+    lie_deadline_iso = lie_deadline_at.isoformat()
+    phase_event = {
+        "name": "phase.question_shown",
+        "payload": build_question_shown_payload(round_question, lie_deadline_iso, round_config.lie_seconds),
+    }
+    return RoundTransitionResult(
+        session=session,
+        round_config=round_config,
+        round_question=round_question,
+        should_broadcast=True,
+        response_payload=build_question_shown_response(round_question, lie_deadline_iso, round_config.lie_seconds),
+        phase_event_name=phase_event["name"],
+        phase_event_payload=phase_event["payload"],
+    )
+
 def start_next_round(session: GameSession) -> RoundTransitionResult:
     with transaction.atomic():
         locked_session = GameSession.objects.select_for_update().get(pk=session.pk)