Replaced awkward "lookback" pattern with clean "prepare → execute → save"
orchestration that captures state snapshots BEFORE each play.
Key improvements:
- Added per-team batter indices (away_team_batter_idx, home_team_batter_idx)
- Added play snapshot fields (current_batter/pitcher/catcher_lineup_id)
- Added on_base_code bit field for efficient base situation queries
- Created _prepare_next_play() method for snapshot preparation
- Refactored start_game() with hard lineup validation requirement
- Refactored resolve_play() with explicit 6-step orchestration
- Updated _save_play_to_db() to use snapshots (no DB lookbacks)
- Enhanced state recovery to rebuild from last play (single query)
- Added defensive lineup position validator
Benefits:
- No special cases for first play
- Single source of truth in GameState
- Saves 18+ database queries per game
- Fast state recovery without replay
- Complete runner tracking (before/after positions)
- Explicit orchestration (easy to debug)
Testing:
- Added 3 new test functions (lineup validation, snapshot tracking, batting order)
- All 5 test suites passing (100%)
- Type checking cleaned up with targeted suppressions for SQLAlchemy
Documentation:
- Added comprehensive "Type Checking & Common False Positives" section to CLAUDE.md
- Created type-checking-guide.md and type-checking-summary.md
- Added mypy.ini configuration for SQLAlchemy/Pydantic
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Core Components:
✅ GameValidator (validators.py)
- Validates game state and decisions
- Rule enforcement for baseball gameplay
- Game-over and inning continuation logic
✅ PlayResolver (play_resolver.py)
- Resolves play outcomes using AbRoll system
- Simplified result charts for MVP
- Handles wild pitch/passed ball checks
- Runner advancement logic for all hit types
- PlayOutcome enum with 12 outcome types
✅ GameEngine (game_engine.py)
- Orchestrates complete game flow
- Start game, submit decisions, resolve plays
- Integrates DiceSystem with roll context
- Batch saves rolls at end of each half-inning
- Persists plays and game state to database
- Manages inning advancement and game completion
Integration Features:
- Uses advanced AbRoll system (not simplified d20)
- Roll context tracking per inning
- Batch persistence at inning boundaries
- Full audit trail with roll history
- State synchronization between memory and database
Architecture:
GameEngine → PlayResolver → DiceSystem
↓ ↓
GameValidator StateManager
↓ ↓
Database In-Memory Cache
Ready For:
✅ End-to-end at-bat testing
✅ WebSocket integration
✅ Result chart configuration
✅ Advanced decision logic (Phase 3)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
