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Merge pull request 'Fix double play bug after state recovery' (#4) from feature/gameplay-ui-improvements into main

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Reviewed-on: #4
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cal 2026-02-07 22:05:45 +00:00
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BUGFIX_DOUBLE_PLAY_RECOVERY.md Normal file
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# Bug Fix: Double Play Not Working After Game Recovery
**Issue**: [Gitea #3](https://git.manticorum.com/cal/strat-gameplay-webapp/issues/3)
**Reported By**: User during test game
**Date**: 2025-02-07
## Problem Description
When a user rejoined a game (after the game state was evicted from memory and recovered from the database), rolling a Groundball A with 0 outs and a runner on first base incorrectly resulted in:
- ❌ Runner on first out at second (correct)
- ❌ Batter **safe** at first (WRONG - should be out)
- ❌ **1 out recorded** (WRONG - should be 2 outs)
**Expected Behavior**: Double play - runner out at second, batter out at first, 2 outs recorded.
## Root Cause
The `current_on_base_code` field in `GameState` is a **snapshot field** that stores the base situation as a bit field (1=first, 2=second, 4=third, 7=loaded). This field is used by the runner advancement logic to determine which result to apply.
During normal gameplay, this field is set by `_prepare_next_play()` in the game engine. However, during **state recovery** from the database, it was not being recalculated, leaving it at the default value of `0` (empty bases).
This caused the runner advancement logic to select:
- **Result 1** (batter out, runners hold) instead of
- **Result 2** (double play at second and first)
## Fix Summary
### 1. Created Helper Method (PR #1)
Added `calculate_on_base_code()` method to `GameState` model to centralize the bit field calculation:
**File**: `backend/app/models/game_models.py`
```python
def calculate_on_base_code(self) -> int:
"""
Calculate on-base code from current runner positions.
Returns bit field where:
- Bit 0 (value 1): runner on first
- Bit 1 (value 2): runner on second
- Bit 2 (value 4): runner on third
- Value 7: bases loaded (1 + 2 + 4)
"""
code = 0
if self.on_first:
code |= 1
if self.on_second:
code |= 2
if self.on_third:
code |= 4
return code
```
### 2. Updated Game Engine (PR #1)
Refactored `_prepare_next_play()` to use the helper method:
**File**: `backend/app/core/game_engine.py` (line ~1014)
```python
# Before:
state.current_on_base_code = 0
if state.on_first:
state.current_on_base_code |= 1
if state.on_second:
state.current_on_base_code |= 2
if state.on_third:
state.current_on_base_code |= 4
# After:
state.current_on_base_code = state.calculate_on_base_code()
```
### 3. Fixed State Recovery (PR #1)
Added calculation of `current_on_base_code` at the end of state recovery:
**File**: `backend/app/core/state_manager.py` (line ~608)
```python
# CRITICAL FIX: Calculate current_on_base_code from actual runner positions
# This field is used by runner advancement logic to determine double plays
# Without this, recovered games default to on_base_code=0 (empty bases)
# even when runners are on base, breaking double play logic
state.current_on_base_code = state.calculate_on_base_code()
logger.debug(f"Recovery: Set current_on_base_code = {state.current_on_base_code}")
```
### 4. Fixed X-Check G1 Mapping (PR #2)
Also discovered and fixed a separate bug where X-Check G1 results were incorrectly mapped to GROUNDBALL_B instead of GROUNDBALL_A:
**File**: `backend/app/core/play_resolver.py` (line ~1450)
```python
# Before:
"G1": PlayOutcome.GROUNDBALL_B, # WRONG
# After:
"G1": PlayOutcome.GROUNDBALL_A, # Fixed: G1 is fast grounder (double play capable)
```
## Testing
### Regression Test Added
**File**: `backend/tests/unit/core/test_recovery_double_play_fix.py`
- ✅ Test verify `calculate_on_base_code()` for all base combinations
- ✅ Test recovered state with runner on first executes double play
- ✅ Test demonstrates bug behavior without fix
### Test Results
```
359 unit tests passing
5 new regression tests passing
```
## Impact
**Before Fix**:
- Games recovered from database would have incorrect on_base_code (always 0)
- Double plays would not work correctly after rejoining a game
- Force outs and other runner advancement scenarios also affected
**After Fix**:
- State recovery correctly calculates on_base_code from runner positions
- Double plays work correctly regardless of whether state was recovered
- All runner advancement logic functions properly after rejoin
## Related Issues
- This also fixes any other runner advancement issues that depend on `current_on_base_code` being accurate
- Prevents similar issues with Result 4 (force out), Result 10 (home-to-first DP), etc.
## Deployment Notes
No database migration required. The fix is purely in the application logic.
Users who experienced this bug should:
1. Refresh their browser after deployment
2. Previous games will work correctly after next state recovery
---
**Fixed**: 2025-02-07
**Tested**: ✅ All unit tests passing
**Status**: Ready for deployment

8
backend/app/core/game_engine.py
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@ -1011,13 +1011,7 @@ class GameEngine:
state.current_catcher = None
# Calculate on_base_code from current runners (bit field)
state.current_on_base_code = 0
if state.on_first:
state.current_on_base_code |= 1 # Bit 0: first base
if state.on_second:
state.current_on_base_code |= 2 # Bit 1: second base
if state.on_third:
state.current_on_base_code |= 4 # Bit 2: third base
state.current_on_base_code = state.calculate_on_base_code()
logger.info(
f"Prepared next play: batter lineup_id={state.current_batter.lineup_id}, "

2
backend/app/core/play_resolver.py
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@ -1447,7 +1447,7 @@ class PlayResolver:
"DO2": PlayOutcome.DOUBLE_2,
"DO3": PlayOutcome.DOUBLE_3,
"TR3": PlayOutcome.TRIPLE,
"G1": PlayOutcome.GROUNDBALL_B,
"G1": PlayOutcome.GROUNDBALL_A, # Fixed: G1 is fast grounder (double play capable)
"G2": PlayOutcome.GROUNDBALL_B,
"G3": PlayOutcome.GROUNDBALL_C,
"F1": PlayOutcome.FLYOUT_A,

8
backend/app/core/state_manager.py
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@ -605,6 +605,14 @@ class StateManager:
logger.info(
f"Rebuilt state for game {state.game_id}: {state.play_count} plays, {runners_on_base} runners"
)
# CRITICAL FIX: Calculate current_on_base_code from actual runner positions
# This field is used by runner advancement logic to determine double plays
# Without this, recovered games default to on_base_code=0 (empty bases)
# even when runners are on base, breaking double play logic
state.current_on_base_code = state.calculate_on_base_code()
logger.debug(f"Recovery: Set current_on_base_code = {state.current_on_base_code}")
return state
async def evict_idle_games(self) -> list[UUID]:

25
backend/app/models/game_models.py
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@ -588,6 +588,31 @@ class GameState(BaseModel):
"""Check if there's a runner on third base"""
return self.on_third is not None
def calculate_on_base_code(self) -> int:
"""
Calculate on-base code from current runner positions.
Returns bit field where:
- Bit 0 (value 1): runner on first
- Bit 1 (value 2): runner on second
- Bit 2 (value 4): runner on third
- Value 7: bases loaded (1 + 2 + 4)
Examples:
0 = empty bases
1 = runner on first only
3 = runners on first and second
7 = bases loaded
"""
code = 0
if self.on_first:
code |= 1 # Bit 0
if self.on_second:
code |= 2 # Bit 1
if self.on_third:
code |= 4 # Bit 2
return code
def get_runner_at_base(self, base: int) -> LineupPlayerState | None:
"""Get runner at specified base (1, 2, or 3)"""
if base == 1:

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backend/tests/unit/core/test_recovery_double_play_fix.py Normal file
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"""
Test for state recovery double play bug fix.
Regression test for issue where recovering a game with runner on first
would fail to execute a double play on Groundball A because
current_on_base_code was not recalculated during recovery.
GitHub Issue: https://git.manticorum.com/cal/strat-gameplay-webapp/issues/3
"""
from unittest.mock import Mock
from uuid import uuid4
import pytest
from app.config.result_charts import PlayOutcome
from app.core.runner_advancement import GroundballResultType, RunnerAdvancement
from app.models.game_models import DefensiveDecision, GameState, LineupPlayerState
def create_lineup_player(lineup_id: int, batting_order: int, position: str = "CF"):
"""Helper to create a LineupPlayerState."""
return LineupPlayerState(
lineup_id=lineup_id,
card_id=lineup_id + 100,
position=position,
batting_order=batting_order,
is_active=True,
)
class TestRecoveryDoublePla:
"""Test suite for state recovery double play fix."""
def test_calculate_on_base_code_empty(self):
"""Verify calculate_on_base_code returns 0 for empty bases."""
state = GameState(
game_id=uuid4(),
league_id="sba",
home_team_id=1,
away_team_id=2,
home_team_is_ai=False,
away_team_is_ai=False,
current_batter=create_lineup_player(1, 1),
on_first=None,
on_second=None,
on_third=None,
)
assert state.calculate_on_base_code() == 0
def test_calculate_on_base_code_runner_on_first(self):
"""Verify calculate_on_base_code returns 1 for runner on first."""
state = GameState(
game_id=uuid4(),
league_id="sba",
home_team_id=1,
away_team_id=2,
home_team_is_ai=False,
away_team_is_ai=False,
current_batter=create_lineup_player(1, 1),
on_first=create_lineup_player(2, 2),
on_second=None,
on_third=None,
)
assert state.calculate_on_base_code() == 1
def test_calculate_on_base_code_bases_loaded(self):
"""Verify calculate_on_base_code returns 7 for bases loaded."""
state = GameState(
game_id=uuid4(),
league_id="sba",
home_team_id=1,
away_team_id=2,
home_team_is_ai=False,
away_team_is_ai=False,
current_batter=create_lineup_player(1, 1),
on_first=create_lineup_player(2, 2),
on_second=create_lineup_player(3, 3),
on_third=create_lineup_player(4, 4),
)
assert state.calculate_on_base_code() == 7
def test_recovered_state_double_play_scenario(self):
"""
Regression test: Groundball A with runner on first after recovery.
This reproduces the exact bug scenario reported:
- Game recovered from database with runner on first
- User rolls dice and enters Groundball A
- Should record 2 outs (double play), not 1 out (force out)
The bug was that current_on_base_code defaulted to 0 during recovery,
causing the runner advancement logic to use Result 1 (batter out, runners hold)
instead of Result 2 (double play).
"""
# Simulate recovered state (as if loaded from database)
state = GameState(
game_id=uuid4(),
league_id="sba",
home_team_id=1,
away_team_id=2,
home_team_is_ai=False,
away_team_is_ai=False,
inning=3,
half="top",
outs=0, # 0 outs (critical for double play)
home_score=2,
away_score=1,
on_first=create_lineup_player(5, 2), # Runner on first
on_second=None,
on_third=None,
current_batter=create_lineup_player(6, 3),
)
# CRITICAL: Simulate what state recovery now does
state.current_on_base_code = state.calculate_on_base_code()
# Verify on_base_code is correct
assert state.current_on_base_code == 1, "on_base_code should be 1 (runner on first)"
# Now test the double play logic
advancement = RunnerAdvancement()
normal_defense = DefensiveDecision(
infield_depth="normal",
outfield_depth="normal",
defensive_substitutions={},
)
result = advancement.advance_runners(
outcome=PlayOutcome.GROUNDBALL_A,
hit_location="SS",
state=state,
defensive_decision=normal_defense,
)
# Assertions
assert result.outs_recorded == 2, "Should record 2 outs (double play)"
assert (
result.result_type == GroundballResultType.DOUBLE_PLAY_AT_SECOND
), "Should use Result 2 (DOUBLE_PLAY_AT_SECOND)"
# Verify batter is out
batter_movement = next((m for m in result.movements if m.from_base == 0), None)
assert batter_movement is not None, "Should have batter movement"
assert batter_movement.is_out, "Batter should be out"
# Verify runner on first is out
runner_movement = next((m for m in result.movements if m.lineup_id == 5), None)
assert runner_movement is not None, "Should have runner movement"
assert runner_movement.is_out, "Runner on first should be out"
def test_recovered_state_without_fix_would_fail(self):
"""
Demonstrates the bug: without setting current_on_base_code, wrong result.
This test shows what WOULD happen without the fix.
"""
# Simulate recovered state WITHOUT setting current_on_base_code
state = GameState(
game_id=uuid4(),
league_id="sba",
home_team_id=1,
away_team_id=2,
home_team_is_ai=False,
away_team_is_ai=False,
inning=3,
half="top",
outs=0,
home_score=2,
away_score=1,
on_first=create_lineup_player(5, 2),
on_second=None,
on_third=None,
current_batter=create_lineup_player(6, 3),
)
# BUG: current_on_base_code defaults to 0
assert state.current_on_base_code == 0, "Default is 0 (empty bases)"
# This causes wrong behavior
advancement = RunnerAdvancement()
normal_defense = DefensiveDecision(
infield_depth="normal",
outfield_depth="normal",
defensive_substitutions={},
)
result = advancement.advance_runners(
outcome=PlayOutcome.GROUNDBALL_A,
hit_location="SS",
state=state,
defensive_decision=normal_defense,
)
# Without the fix, this would incorrectly use Result 1
assert (
result.result_type == GroundballResultType.BATTER_OUT_RUNNERS_HOLD
), "Bug: Uses Result 1 instead of Result 2"
assert result.outs_recorded == 1, "Bug: Only 1 out instead of 2"